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Cattaneo L, Prieto C, Ojeda D, Pereira A, Frutos J, Bó GA. The use of a recombinant equine chorionic gonadotropin (reCG) in fixed-time AI programs in beef cattle. Theriogenology 2024; 227:77-83. [PMID: 39029411 DOI: 10.1016/j.theriogenology.2024.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 07/04/2024] [Accepted: 07/11/2024] [Indexed: 07/21/2024]
Abstract
The aim of the current study was to evaluate the effect of a novel recombinant eCG (reCG) on pregnancy rates to AI (P/AI) in suckled beef cows of different breeds that were synchronized with an estradiol/progesterone (P4)-based protocol for fixed-time AI (TAI). In experiment 1, 1244 Bos taurus suckled cows were used. On Day 0 all cows received an intravaginal P4 device (600 mg P4) and 2 mg of estradiol benzoate. On Day 7, devices were removed, and all cows received 0.150 mg of D-cloprostenol plus 1 mg of estradiol cypionate and were randomly divided to receive 140 IU or 105 IU of reCG or no reCG treatment (controls) at that time. Cows were tail painted for estrus detection and those in estrus by 48 h after P4 device removal were inseminated; whereas those not showing estrus were also inseminated and received GnRH at the same time. In experiment 2, 818 Bos taurus x Bos indicus crossbred suckled cows received the same FTAI protocol used in Experiment 1. Cows were randomly divided at the time of P4 device removal into 4 groups to receive 140 IU, 105 IU or 84 IU of reCG or no reCG treatment. In experiment 3, 345 Bos indicus suckled cows were submitted to the same FTAI protocol as those in previous experiments and were randomly divided into three groups to receive 140 IU or 105 IU of reCG, or 300 IU of serum derived eCG (PMSG). In Experiment 1, estrus rate and P/AI was greater (P < 0.05) in cows treated with reCG (79.9 and 53.5 %, 76.9 and 52.3 % for the 105 UI and 140 UI reCG groups, respectively) than those in the control group (69.9 and 44.4 %, respectively). In Experiment 2, cows treated with reCG tended (P < 0.1) to achieve a greater P/AI than control cows (38.6 %, 37.1 %, 36.2 % and 28.2 % for those receiving 84 IU, 105 IU,140 IU of reCG, and those in the control group); but when P/AI of all cows treated with reCG was contrasted to that of control cows, the difference was significant (P < 0.01). In Experiment 3, P/AI in cows treated with 84 IU of reCG (54 %) did not differ from that of cows treated with serum derived eCG (59 %) but both were greater (P < 0.05) than cows treated with 105 UI of reCG (41 %). In conclusion, treatment with reCG improved fertility in suckled Bos taurus and Bos taurus x Bos indicus beef cows. In suckled Bos indicus cows, although treatment with reCG and serum derived eCG were comparable, the higher dosage of reCG was detrimental to their P/AI.
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Affiliation(s)
- Luciano Cattaneo
- Facultad de Ciencias Veterinarias, Universidad Nacional del Litoral, Esperanza, Santa Fe, Argentina; CEVA-ZOOVET S.A., Santa Fe, Argentina
| | - Claudio Prieto
- CEVA-Biotecnofe S.A., Santa Fe, Argentina; Facultad de Bioquímica y Ciencias Biológicas, Centro Biotecnológico del Litoral, Laboratorio de Desarrollo Biotecnológico, Ciudad Santa Fe, Argentina
| | | | | | | | - Gabriel A Bó
- Instituto de Reproducción Animal Córdoba (IRAC), Córdoba, Argentina; Instituto A.P. de Ciencias Básicas y Aplicadas, Medicina Veterinaria, Universidad Nacional de Villa María, Villa del Rosario, Córdoba, Argentina.
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Andrade JPN, Monteiro PJL, Prata AB, Robl AJ, Neto J, Lippe B, Ribeiro HS, Hartmman D, Sartori R, Wiltbank MC. Optimizing ReBreed21 II: Fertility and reproductive efficiency in different parities during a shortened breeding season in beef cattle. Theriogenology 2024; 224:41-49. [PMID: 38733813 DOI: 10.1016/j.theriogenology.2024.04.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 04/26/2024] [Accepted: 04/29/2024] [Indexed: 05/13/2024]
Abstract
This study evaluated the efficiency of a rapid reinsemination program allowing timed AI (TAI) every 21d (ReBreed21) in a commercial beef cow-calf operation. Nelore females from different parities (n = 2085) were synchronized for first TAI (D0 = TAI) using an estradiol/progesterone (E2/P4) protocol and assigned to one of three reinsemination programs: Resynch33 (n = 753), traditional resynch program with second TAI at D42 after first TAI; ReBreed21 (n = 687); or ReBreed21+EC (n = 670). The ReBreed females (n = 1357) received intravaginal P4 insert on D12, on D19 P4 was removed, and a dose of equine chorionic gonadotropin (eCG) was administered, then, ReBreed21 females received 0.6 mg of EC (ReBreed21+EC) or nothing (ReBreed21) and on D21, nonpregnancy (NP) was determined using Doppler ultrasound to detect corpus luteum (CL) blood flow (BF) (NP: <25 % BF pixels of total CL area) and NP cows received immediate TAI and GnRH to induce ovulation. Pregnancy diagnosis was performed at D33 after TAI following all TAIs. Cows considered pregnant at D21, based on CL BF, but NP on D33 were designated False-Positives (FP) and false negatives (FN) were number of nonpregnant cows/heifers on d21 based on the CL BF found to subsequently be pregnant on D33 divided by the total number pregnant. Pregnancy/AI (P/AI) did not differ for the first TAI (55.1 %) among the treatments. Heifers had similar P/AI at the second AI in all groups and similar to the first AI. Primiparous had greater P/AI in ReBreed21+EC and Resynch33 at s TAI compared to ReBreed21, 51.7 %, 55.8 %, 34.2 %, respectively. Multiparous had greater P/AI at second TAI in Resynch33 (60.9 %) than ReBreed21 programs (34.7 %). The percentage FP and FN among ReBreed21 programs did not differ, 13.8 and 0.2 %, respectively. Overall accumulative pregnancies on D21 of the breeding season were greater for ReBreed21 and ReBreed21+EC than Resynch33 (69.7 %, 71.6 %, and 55.5 %, respectively). However, on D42 of the breeding season, only heifers had greater pregnancies in ReBreed21 programs than Resynch33 (73.3 %, 74.3.6 %, and 63.2 %, respectively). Average days to pregnancy were less (P = 0.01) for ReBreed21 and ReBreed21+EC than Resynch33. Thus, the ReBreed21 strategy can improve the efficiency of TAI programs in beef cattle. Of interest, ReBreed21 was particularly effective in nulliparous, somewhat effective in primiparous when EC was added to the program, but relatively ineffective in multiparous beef cattle.
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Affiliation(s)
- João Paulo N Andrade
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, WI, 53706, USA
| | - Pedro J L Monteiro
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, WI, 53706, USA
| | | | | | - José Neto
- Agropecuária Roncador, Querência, MT, 78643-000, Brazil
| | - Beatriz Lippe
- Department of Animal Science, Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo, Piracicaba, SP, 13418-900, Brazil
| | | | | | - Roberto Sartori
- Department of Animal Science, Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo, Piracicaba, SP, 13418-900, Brazil
| | - Milo C Wiltbank
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, WI, 53706, USA.
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Andrade JPN, Domingues RR, Carvalho BP, Gomez-Leon V, Prata AB, Sartori R, Wiltbank MC. Optimizing ReBreed21 I: Evaluation of endocrine and ovarian dynamics in non-bred Bos indicus heifers. Theriogenology 2024; 220:77-83. [PMID: 38490112 DOI: 10.1016/j.theriogenology.2024.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/03/2024] [Accepted: 03/06/2024] [Indexed: 03/17/2024]
Abstract
The present study evaluated follicular and endocrine dynamics during ReBreed21, a reproductive strategy that allows resynchronization of ovulation every 21 days in Bos indicus (Nelore) heifers. A synchronized estrous cycle was induced using a standard timed ovulation protocol (d -10: P4 implant inserted + 2 mg estradiol benzoate; d -2: P4 removed+ 0.5 mg cloprostenol + 0.6 mg estradiol cypionate + 200 IU equine chorionic gonadotropin (eCG); d0: 8.4 μg buserelin) without AI to ensure nonpregnancy in heifers. Day of GnRH was designated d0 of estrous cycle. On d12, heifers (n = 80) were randomized into three experimental groups: (1) ReBreed21 (n = 28) d12 P4 device inserted, d19 P4 device withdrawal plus 200 IU eCG, and d21 8.4 μg buserelin (GnRH); (2) ReBreed21+G (n = 26) same as ReBreed21 plus GnRH (16.8 μg) treatment on d12; and (3) Control (n = 26) no treatment. ReBreed21+G increased two-fold (62.9%; 18/26) percentage of heifers with synchronized follicular wave emergence compared to Control (34.6%; 9/26) whereas ReBreed21 (53.6%; 15/28) was intermediate. The ReBreeed21 groups (eCG on d19) increased (P < 0.01) follicular growth between d19 and d21 in ReBreed21 (2.3 ± 0.2 mm) and ReBreed21+G (3.4 ± 0.2 mm) compared with Control (1.2 ± 0.3 mm), resulting in greater (P < 0.01) follicle diameter on d21 for ReBreed21 (10.7 ± 0.4 mm) and ReBreed21+G (10.8 ± 0.4 mm) compared with Control (9.1 ± 0.5 mm). Structural luteolysis was similar among groups (P = 0.51), although the average day when P4 was <1 ng/mL was later (P < 0.01) for ReBreed21 (20.5 ± 0.2) and ReBreed21+G (20.7 ± 0.2) compared to Control (19.2 ± 0.4). Overall ovulation at the end of the estrous cycle was increased (P = 0.03) for ReBreed21 groups (83.3%; 45/54) compared with Control (57.7%; 15/26). Synchronized ovulation on day 22-23 was greater (P < 0.01) for ReBreed21 (78.6%; 22/28) and ReBreed21+G (76.9%; 20/26) compared with Control (30.8%; 8/26). Thus, the ReBreed21 resynchronization program produced acceptable endocrine and follicular dynamics, including synchronized ovulation at the end of the protocol in nonpregnant heifers providing good rationale for testing the fertility and practical implementation of this protocol under field conditions.
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Affiliation(s)
- João Paulo N Andrade
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Wisconsin, 53706, USA
| | - Rafael R Domingues
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Wisconsin, 53706, USA
| | - Bruno P Carvalho
- Empresa Brasileira de Pesquisa Agropecuária-Rio Branco, Acre, 69900-970, Brazil
| | - Victor Gomez-Leon
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Wisconsin, 53706, USA
| | | | - Roberto Sartori
- Department of Animal Science, Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo, Av. Pádua Dias, 11, Piracicaba, SP, 13418-900, Brazil
| | - Milo C Wiltbank
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Wisconsin, 53706, USA.
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Ukita H, Yamazaki T, Yamaguchi S, Abe H, Baba T, Bai H, Takahashi M, Kawahara M. Environmental factors affecting the conception rates of nulliparous and primiparous dairy cattle. J Dairy Sci 2022; 105:6947-6955. [DOI: 10.3168/jds.2022-21948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 04/05/2022] [Indexed: 11/19/2022]
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Pfeifer L, Gasperin B, Cestaro J, Schneider A. Postponing TAI in beef cows with small preovulatory follicles. Anim Reprod Sci 2022; 242:107006. [DOI: 10.1016/j.anireprosci.2022.107006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 05/16/2022] [Accepted: 05/19/2022] [Indexed: 11/16/2022]
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Abdel Aziz RL, Hussein MM, Mohamed MAA, Elsaid H, Abdel-Wahab A. Heat stress during critical windows of the estrous cycle and risk of pregnancy establishment in embryo-recipient dairy heifers. Reprod Domest Anim 2022; 57:856-863. [PMID: 35437877 DOI: 10.1111/rda.14128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 04/17/2022] [Indexed: 11/30/2022]
Abstract
This study aimed to determine effects of exposure of recipient dairy heifers to heat stress (THI≥ 73) during the estrous cycle coinciding with embryo transfer (ET) on the risk of pregnancy establishment after transfer of in vivo produced embryos. Recipients exposed to THI values ≥ 73 during days zero (recipient estrus), 7 (day of ET), 14 (seven days after ET), 15 and 16 (maternal recognition of pregnancy) of the ET cycle were considered as heat stressed heifers (n=254), while heifers in the control group (n=470) were not exposed to THI≥ 73 at any of the previous days. Results revealed no significant effects of any of the investigated factors on the risk of pregnancy following ET. However, the mean THI above 77 was associated with a drastic numerical decrease in PR/ET (36.63%), when compared to a mean THI 72 (78.78%). In addition, PR/ET after transfer of second and third grade embryos were numerically lower in heat-stressed recipients, compared to first grade embryos (41.17 vs 56.36%, respectively). Our findings confirmed that transfer of blastocysts were associated with numerically higher PR/ET in heat stressed and control recipients, as compared to morula stage. Interestingly, PR/ET tended to be higher when sexed embryos were transferred to the control recipients compared to heat-stressed ones. In conclusion, PR/ET in dairy heifers was not significantly affected by heat stress during critical windows of their estrous cycle coinciding with ET, whereas transfer of sexed embryos gives lower results under conditions of heat stress.
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Affiliation(s)
- Rabie L Abdel Aziz
- Department of Theriogenology, Faculty of Veterinary Medicine, Beni-Suef University, 62511, Beni-Suef, Egypt
| | - Mahmoud M Hussein
- Department of Theriogenology, Faculty of Veterinary Medicine, Beni-Suef University, 62511, Beni-Suef, Egypt
| | | | - Hussein Elsaid
- Veterinary and Embryo transfer sector, Milkys Company, Behairah, Egypt
| | - Ahmed Abdel-Wahab
- Physiology Department, Faculty of Veterinary Medicine, Minia University, El, Minia, 61519, Egypt
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Morotti F, Miguez-Gonzalez S, Cerezetti MB, Seneda MM. Evaluation of three classification methods of antral follicle count and fertility to the timed artificial insemination in cattle. Anim Reprod 2022; 19:e20210121. [PMID: 35493784 PMCID: PMC9037601 DOI: 10.1590/1984-3143-ar2021-0121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 03/23/2022] [Indexed: 11/21/2022] Open
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Couto LFM, Zapa DMB, Heller LM, Cavalcante ASDA, Nicaretta JE, Cruvinel LB, Colli MHA, Ferreira LL, Alencar A, de Melo-Junior RD, Soares VE, Borges FDA, Lopes WDZ. Gastrointestinal nematode control programs in yearling Nellore heifers: Analysis of fecal egg counts, weight gain and reproductive indices. Anim Reprod Sci 2021; 226:106695. [PMID: 33485086 DOI: 10.1016/j.anireprosci.2021.106695] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 01/04/2021] [Accepted: 01/05/2021] [Indexed: 11/23/2022]
Abstract
The objective of this study was to evaluate two different gastrointestinal nematode treatment regimens. Fecal egg counts (FECs), proportion of nematode genera, weight gain, body condition score and reproductive indices (estrous cyclicity, conception and pregnancy rates) were evaluated in yearling heifers after imposing two treatment regimens for gastrointestinal nematodes: T1 = 306 calves treated in May and November with 3.5 % doramectin (700 μg/kg) and August (Aug) with saline solution; and T2 = 307 calves treated in May with 3.5 % doramectin (700 μg/kg), in August with 1% moxidectin (200 μg/kg) and in November with 3.5 % doramectin (700 μg/kg). The animals were weighed, and feces were collected for conducting FECs and coproculture. There was imposing of three fixed-time artificial inseminations (TAIs), and estrous cyclic and pregnancy statuses were determined. Cooperia was the most frequent genus detected in both groups. Heifers of the T2, as compared to those in the T1 group, had fewer FECs in November (P ≤ 0.05) and greater weight gain and average daily weight gain (P ≤ 0.05) from August to November. There tended to be more heifers of the T2 than T1 group estrous cycling (P = 0.07) at the beginning of the breeding season as well as greater pregnancy rates (P = 0.03) and conception rates (P = 0.03) as a result of the second FTAI. The results indicate there is greater reproduction outcomes as a result of strategic control of gastrointestinal nematodes in yearling Nellore heifers using the T1 as compared with T2 treatment regimen.
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Affiliation(s)
- Luiz Fellipe Monteiro Couto
- Laboratório de Especialidades Parasitárias, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Dina María Beltrán Zapa
- Laboratório de Especialidades Parasitárias, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Luciana Maffini Heller
- Laboratório de Especialidades Parasitárias, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Alliny Souza de Assis Cavalcante
- Laboratório de Especialidades Parasitárias, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - João Eduardo Nicaretta
- Laboratório de Especialidades Parasitárias, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Leonardo Bueno Cruvinel
- Laboratório de Especialidades Parasitárias, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | | | - Lorena Lopes Ferreira
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Amanda Alencar
- Veterinarian, Fazenda São Marcelo, Juruena, Mato Grosso, Brazil
| | - Rubens Dias de Melo-Junior
- Laboratório de Especialidades Parasitárias, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | | | - Fernando de Almeida Borges
- Faculdade de Medicina Veterinária e Zootecnia, Universidade Federal do Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, Brazil
| | - Welber Daniel Zanetti Lopes
- Laboratório de Especialidades Parasitárias, Escola de Veterinária e Zootecnia, Universidade Federal de Goiás, Goiânia, Goiás, Brazil; Departamento de Biociências e Tecnologia, Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, Goiás, Brazil.
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Pugliesi G, Bisinotto DZ, Mello BP, Lahr FC, Ferreira CA, Melo GD, Bastos MR, Madureira EH. A novel strategy for resynchronization of ovulation in Nelore cows using injectable progesterone (P4) and P4 releasing devices to perform two timed inseminations within 22 days. Reprod Domest Anim 2019; 54:1149-1154. [PMID: 31134689 DOI: 10.1111/rda.13475] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 05/17/2019] [Indexed: 01/26/2023]
Abstract
We aimed to evaluate the reproductive performance of Nelore lactating cows submitted to a resynchronization 12 days after timed artificial insemination (TAI) with or without a long-acting progesterone (P4-LA) treatment. Nelore cows were submitted to a P4/oestradiol-based TAI protocol (D0 = insemination). On D12, cows in the control group (n = 184) received a new P4 intravaginal device (0.96 g), whereas cows in the P4-LA group (n = 192) received the P4 device and 75 mg P4-LA. Cows identified as non-pregnant (n = 120) by regression of corpus luteum using colour Doppler ultrasonography on D20 had the P4 device removed and received 500ug of sodium cloprostenol, 1 mg of oestradiol cypionate and 300 IU of eCG and were re-inseminated on D22. There was no difference (p > 0.10) in the pregnancy rate at D20, D30 and D60 after first TAI between the control (69%, 59.7% and 57%, respectively) and P4-LA (67%, 55.7%, and 55.2%, respectively) groups. Pregnancy losses were similar between both groups (p > 0.1). For cows submitted to the second TAI, the pre-ovulatory follicle size did not differ (p > 0.1), but the oestrous detection and pregnancy rates were greater (p < 0.05) in the P4-LA group (92.2% [59/64] and 60.9% [39/64], respectively) than in controls (75% [42/56] and 44.6% [25/56]). The cumulative pregnancy rate after two TAIs did not differ (p > 0.1) between control (73.3% [135/184]) and P4-LA (76% [146/192]) groups. The use of P4-LA at 12 days after TAI potentially increases the pregnancy rates for a new early resynchronization strategy associated with the Doppler imaging for pregnancy diagnosis and results in an alternative to perform two TAIs in 22 days in beef cows.
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Affiliation(s)
- Guilherme Pugliesi
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, Brazil
| | - Danilo Zago Bisinotto
- Department of Veterinary, School of Animal and Food Sciences, University of São Paulo, Pirassununga, Brazil
| | - Barbara Piffero Mello
- Department of Veterinary, School of Animal and Food Sciences, University of São Paulo, Pirassununga, Brazil
| | - Fábio C Lahr
- Department of Veterinary, School of Animal and Food Sciences, University of São Paulo, Pirassununga, Brazil
| | - Catia A Ferreira
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, Brazil
| | - Gabriela Dalmaso Melo
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, Brazil
| | | | - Ed Hoffmann Madureira
- Department of Animal Reproduction, School of Veterinary Medicine and Animal Science, University of São Paulo, Pirassununga, Brazil
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de Oliveira DAM, Kozicki LE, Gaievski FR, Pedrosa VB, Weiss RR, Segui MS, Bergstein‐Galan TG. Resynchronization of ovulation with new and reused intravaginal progesterone‐releasing devices without previous pregnancy diagnosis in
Bos taurus indicus
cows subjected to timed‐artificial insemination. Reprod Domest Anim 2019; 54:779-785. [DOI: 10.1111/rda.13427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 02/13/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Danilo Amadori Martins de Oliveira
- Veterinary Medicine, Postgraduate Program in Animal Science, Escola de Ciências da Vida Pontifícia Universidade Católica do Paraná Curitiba Brazil
| | - Luiz Ernandes Kozicki
- Veterinary Medicine, Postgraduate Program in Animal Science, Escola de Ciências da Vida Pontifícia Universidade Católica do Paraná Curitiba Brazil
| | - Francisco Romano Gaievski
- Veterinary Medicine, Postgraduate Program in Animal Science, Escola de Ciências da Vida Pontifícia Universidade Católica do Paraná Curitiba Brazil
| | - Victor Breno Pedrosa
- Departamento de Zootecnia, Animal Science Ponta Grossa State University Ponta Grossa Brazil
| | - Romildo Romualdo Weiss
- Veterinary Medicine, Setor de Ciências Agrárias Federal University of Paraná Curitiba Brazil
| | - Márcio Saporski Segui
- Veterinary Medicine, Postgraduate Program in Animal Science, Escola de Ciências da Vida Pontifícia Universidade Católica do Paraná Curitiba Brazil
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Rodrigues WB, Jara JDP, Borges JC, Fialho de Oliveira LO, Gomes de Abreu UP, Anache NA, Casanova da Silva K, Bezerra ADO, Cardoso CJT, Nogueira E. Efficiency of mating, artificial insemination or resynchronisation at different times after first timed artificial insemination in postpartum Nellore cows to produce crossbred calves. ANIMAL PRODUCTION SCIENCE 2019. [DOI: 10.1071/an17466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The objective of this trial was to evaluate different post-timed artificial insemination (TAI) reproductive managements in postpartum beef cows to produce crossbred calves from artificial insemination (AI). Nellore cows (n = 607), with 45 days postpartum, were inseminated at a fixed time, using a protocol that included an intravaginal progesterone-releasing device along with oestradiol benzoate, prostaglandin, equine chorionic gonadotropin, and oestradiol cypionate, followed TAI 48 h post-device removal. Four post-TAI treatments were evaluated: in CONTROL (T1, n = 161), cows were exposed to Nellore clean-up bulls until the end of the breeding season (75 days). In OBSERVATION (T2, n = 132), heat detection was performed for 15–25 days post-TAI, followed by AI. In RESYNC22 (T3, n = 157) and RESYNC30 (T4, n = 157), resynchronisation started after 22 or 30 days, following second TAI at Day 32 or 40 days after first TAI. In T2, T3 and T4, after the second AI, cows were exposed to Nellore clean-up bulls until the end of the breeding season (75 days). The pregnancy rate (PR) for the first TAI did not differ (54.6%, 53.0%, 59.2%, and 51.6% for CONTROL, OBSERVATION, RESYNC 22, and RESYNC 30, respectively; P = 0.66), and no difference was observed for the second TAI (RESYNC 22 = 45.31% and RESYNC30 = 46.05%; P = 0.137), in the PR at the end of the breeding season (86.33%, 86.36%, 78.98%, and 81.52%, P = 0.43), or embryonic losses (4.54%, 2.85%, 6.45% and 7.40%, respectively; P = 0.61), but the percentage of crossbred pregnancy was higher in groups with resynchronisation (RESYNC22 and RESYNC30) than CONTROL and OBSERVATION (98.38%, 90.62%, 63.30%, 78.95%, P < 0.001). In conclusion, resynchronisation programs of 22 or 30 days are more efficient to produce AI products, and the final pregnancy rate is similar among the treatments, differing only in the amount of calves produced by AI.
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Patron R, Lopez-Helguera I, Pesantez-Pacheco JL, Perez-Villalobos N, Heras J, Vicente Gonzalez J, Fargas O, Astiz S. Resynchronization with the G6G protocol: A retrospective, observational study of second and later timed artificial inseminations on commercial dairy farms. Reprod Domest Anim 2018; 54:243-251. [DOI: 10.1111/rda.13343] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 09/07/2018] [Indexed: 11/30/2022]
Affiliation(s)
| | - Irene Lopez-Helguera
- Departamento de Ciencia Animal; Universitat de Lleida and Agrotecnio Center; Lleida Spain
| | - Jose Luis Pesantez-Pacheco
- School of Veterinary Medicine and Zootechnics, Faculty of Agricultural Sciences; University of Cuenca; Cuenca Ecuador
- Departamento de Reproducción Animal (INIA); Madrid Spain
| | | | | | - Juan Vicente Gonzalez
- TRIALVET S.L.; Madrid Spain
- Departamento de Medicina y Cirugía Animal, Veterinary Faculty; Universidad Complutense de Madrid; Madrid Spain
| | | | - Susana Astiz
- Departamento de Reproducción Animal (INIA); Madrid Spain
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Marques MDO, Morotti F, Lorenzetti E, Bizarro-Silva C, Seneda MM. Intensified use of TAI and sexed semen on commercial farms. Anim Reprod 2018; 15:197-203. [PMID: 34178142 PMCID: PMC8202457 DOI: 10.21451/1984-3143-ar2018-0070] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The livestock sector has achieved many technological advances, which have resulted in continued
improvements in animal production systems and in the reproductive efficiency of herds. The
associated use of reproductive biotechnology and genetic improvements combined with adequate
sanitary and nutritional management are essential conditions for sustainable intensified
animal production and financial autonomy within farms. Timed artificial insemination (TAI)
represents one of the strategies with the greatest impact of expansion in providing genetic
improvements and increased reproductive efficiency at a decreased cost. Despite the high
proportion of cows receiving TAI, this market still exhibits considerable potential for
expansion. After a TAI procedure, approximately 40 to 60% of females become pregnant. This
result can vary depending on such factors as the hormonal protocol employed, female category,
body condition score, ovarian status, farm management and aspects related to bulls and semen.
The fertility and genetic quality of the bull plays an important role in the herd because a single
bull can influence the entire production system. Another important strategy is the use of
sex-sorted semen associated with TAI, primarily when associated with management practices
to improve the pregnancy rate. This paper presents a review of the intensification of TAI,
supplying practical information regarding the implementation of TAI commercial programs.
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Affiliation(s)
| | - Fábio Morotti
- Laboratório de Reprodução Animal, DCV-CCA-UEL, Londrina, Parana, Brazil
| | - Elis Lorenzetti
- Laboratório de Reprodução Animal, DCV-CCA-UEL, Londrina, Parana, Brazil.,Universidade Norte do Paraná, UNOPAR, Arapongas, Parana, Brazil
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Morotti F, de Campos JT, Lunardelli PA, Costa CB, Bergamo LZ, Barreiros TRR, Dos Santos GMG, Seneda MM. Injectable progesterone in timed artificial insemination programs in beef cows. Anim Reprod 2018; 15:17-22. [PMID: 33365090 PMCID: PMC7746219 DOI: 10.21451/1984-3143-2017-ar928] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
The aims of this study were I) to compare the follicular diameter, corpus luteum diameter and
serum progesterone (P4) concentrations in cows treated with conventional protocol
vs. injectable P4 protocol; II) to determine the serum P4 profile in ovariectomized
heifers; and III) to compare pregnancy rate between protocols. In experiment I, multiparous
cows received a protocol for ovulation synchronization with an intravaginal P4 device (n
= 38; device + EB day 0; device removal + PGF2α + eCG + EC day 8) or injectable P4 (n = 38;
injection + EB day 0; PGF2α + eCG + EC day 8). In experiment II, ovariectomized heifers
(n = 8) were treated with injectable P4 and blood samples were collected to determine the serum
P4 profile. In experiment III, multiparous cows were timed AI with two different P4 approaches,
intravaginal P4 device (n = 48) or injectable P4 (n = 47). In the first experiment, cows treated
with P4 device had higher (P < 0.05) diameter of dominant follicle after ovulation induction
(11.6 ± 1.8 vs.10.3 ± 1.8 mm) and ovulation rate (97%, 37/38
vs. 47.3%, 18/38) than cows treated with injectable P4. But, the follicular
growth daily was higher (P < 0.05) in cows treated with injectable P4 than intravaginal
device (1.3 ± 0.4 vs. 1.0 ± 0.3 mm/day, respectively).
In experiment II, the P4 concentration peak occurred within 48 hours (6.54 ng/mL) and decreased
after 96 hours (P < 0.05) after P4 injection. In experiment III, cows with P4 device had higher
(P < 0.05) pregnancy rate than the injectable P4 group (60.4 vs. 34.0%,
respectively). These results demonstrate that although the intravaginal P4 devices showed
a higher pregnancy rate, a protocol with injectable P4 represents an easier method and a promising
alternative for TAI in cattle.
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Affiliation(s)
- Fábio Morotti
- Laboratory of Animal Reproduction, University of Londrina, Parana,
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Abstract
The aim of this review is to compare the performance of different reproductive programs using natural service, estrus synchronization treatment before natural service (timed natural breeding (TNB)), artificial insemination (AI) following estrus detection and timed artificial insemination (TAI) in beef herds. It is well known that after parturition the beef cow undergoes a period of anestrous, when they do not exhibit estrus, eliminating the opportunity to become pregnant in the early postpartum by natural mating or by AI after detection of estrus. Hormonal stimulation is already a consistent and well-proven strategy used to overcome postpartum anestrus in beef herds. Basically, hormones that normally are produced during the estrous cycle of the cow can be administered in physiological doses to induce cyclicity and to precisely synchronize follicular growth, estrus and ovulation. Furthermore, two options of mating may be used after hormonal stimulation: natural service (i.e. utilization of bull service after synchronization, referred to as TNB) and TAI. These strategies improve the reproductive efficiency of the herds compared with natural service without estrus induction or synchronization. After the first synchronized service, the most common strategy adopted to get non-pregnant cows pregnant soon is the introduction of clean-up bulls until the end of the breeding season. However, methods to resynchronize non-pregnant cows after the first service are already well established and offer a potential tool to reduce the time for subsequent inseminations. Thus, the use of these technologies enable to eliminate the use of bulls by using resynchronization programs (i.e. two, three or four sequential TAI procedures). The dissemination of efficient reproductive procedures, such as TNB, TAI and Resynch programs, either isolated or in combination, enables the production of a greater quantity (obtaining increased pregnancy rates early in the breeding season) and quality (maximization of the use of AI with superior genetic sires) of beef calves. These technologies can contribute to improve the production efficiency, and consequently, improve livestock profitability.
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Pfeifer L, Castro N, Neves P, Cestaro J, Schneider A. Comparison between two estradiol-progesterone based protocols for timed artificial insemination in blocks in lactating Nelore cows. Anim Reprod Sci 2017; 181:125-129. [DOI: 10.1016/j.anireprosci.2017.03.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 03/31/2017] [Indexed: 10/19/2022]
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