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Funakoshi D, Shiotani H, Seki M. Equine chorionic gonadotropin treatment and timed artificial insemination for dairy cow production under heat stress. J Reprod Dev 2024; 70:30-34. [PMID: 38171736 PMCID: PMC10902633 DOI: 10.1262/jrd.2023-069] [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] [Indexed: 01/05/2024] Open
Abstract
This study investigated the effects of timed artificial insemination (TAI) and equine chorionic gonadotropin (eCG) administration on lactating dairy cows under heat-stress conditions (average temperature-humidity index: 80). Timed artificial insemination was performed on the cows with (n = 57) or without (control, n = 41) supplementation with 500 IU of eCG at the day of PGF2α treatment using the CIDR-Ovsynch protocol. GnRH was administered, and a progesterone device (CIDR) was inserted on Day -10 of the treatment protocol. The CIDR was removed on Day -3, and the cows were treated with PGF2α. Two days later, a 2nd GnRH injection was administered. Subsequently, AI was performed on Day 0 (16-20 h after the 2nd GnRH injection), and pregnancy was diagnosed on Days 32 and 60. Plasma progesterone (P4) concentrations were measured after AI. Results showed that the eCG group had a higher pregnancy per AI (P/AI) than the control group (43.9 vs. 12.2%, P = 0.002), which was also accompanied by elevated P4 levels. Four cows in the eCG group had multiple calves, representing 7.0 and 16.0% of the group and pregnant cows, respectively. In conclusion, 500 IU of eCG combined with CIDR-Ovsynch in lactating dairy cows under severe heat stress conditions successfully improved fertility. However, the protocol may have a slight risk of multiple births.
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Affiliation(s)
| | | | - Makoto Seki
- Aska Animal Health Co., Ltd., Tokyo 108-0023, Japan
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2
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Uddin AHMM, Petrovski KR, Song Y, Garg S, Kirkwood RN. Application of Exogenous GnRH in Food Animal Production. Animals (Basel) 2023; 13:1891. [PMID: 37370402 DOI: 10.3390/ani13121891] [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: 05/04/2023] [Revised: 05/29/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023] Open
Abstract
Over several decades, exogenous GnRH and agonists have been employed for controlling reproductive cascades in animals, and treating some reproductive morbidities. The administration of GnRH is used in animals to counter ovarian dysfunction, induce ovulation, and to increase conception and pregnancy rates. GnRH and its agonists are used in the treatment of cystic ovarian degeneration and repeat breeder syndrome. The development of protocols for GnRH administration by intramuscular injection, intramuscular or subcutaneous implants, and intravaginal deposition has empowered their clinical use worldwide. Currently, exogenous GnRH products are a central part of several pre- and post-breeding programs for the enhancement of fertility, including the control of estrous cycles and timing of ovulation, development of fixed-time artificial insemination protocols, improved embryo survival, and the treatment of reproductive morbidity. The aim of the present review is to summarize the application of exogenous GnRH agonists in food animal production.
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Affiliation(s)
- A H M Musleh Uddin
- School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia
| | - Kiro R Petrovski
- Davies Livestock Research Centre, School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia
- Australian Centre for Antimicrobial Resistance Ecology, School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia
| | - Yunmei Song
- Clinical and Health Sciences, University of South Australia, Adelaide, SA 5000, Australia
| | - Sanjay Garg
- Clinical and Health Sciences, University of South Australia, Adelaide, SA 5000, Australia
| | - Roy N Kirkwood
- School of Animal & Veterinary Sciences, University of Adelaide, Roseworthy Campus, Roseworthy, SA 5371, Australia
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Beasley LH, Cogger N, Compton C. Use of equine chorionic gonadotropin in lactating dairy cattle: a rapid review. N Z Vet J 2023; 71:53-64. [PMID: 36265863 DOI: 10.1080/00480169.2022.2139306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
AIMS To use an evidence-based approach to evaluate the available research data on the efficacy of equine chorionic gonadotropin (eCG) to improve reproductive performance of dairy cows when added to oestrus synchronisation programmes for the treatment of cows not detected in oestrus. METHODS A rapid literature review was conducted to summarise the existing trial data, primarily the effect of eCG on conception rate (CR) to fixed time artificial insemination (FTAI) from oestrus synchronisation programmes in lactating dairy cows. Relevant papers were identified via databases and auxiliary search strategies, then information was collected using a standardised data collection form. Similar studies were grouped together to create a descriptive summary of CR to FTAI and secondary outcome measures, with the creation of forest plots to visualise results. RESULTS A total of 15 studies were identified for review: nine examined the administration of 400-500 IU eCG as part of an oestrus synchronisation programme based on intra-vaginal progesterone-releasing devices, gonadotropin-releasing hormone and prostaglandin (P4-GPG programme). The variable methodologies in the trials evaluated posed difficulties in grouping studies for further analysis and meant that there was insufficient data for a full meta-analysis. A single study reported a statistically significant increase in CR to FTAI from the addition to eCG to a P4-GPG programme in cows with anovulatory anoestrous. Four studies evaluated the addition of eCG to P4-GPG programmes in cows without visible oestrous signs; risk differences for CR to FTAI were between -1.7% and 28.8%, with three out of four studies reporting a positive effect of eCG on CR to FTAI, but all 95% CI values crossed the line of no effect. Two studies reported on the effect of eCG on 42-day pregnancy rate following a P4-GPG programme; one reported a risk difference of -4.9% (95% CI = -10.6-0.8%), while the other reported a risk difference of 7.9% (95% CI = 0.8-15%). CONCLUSIONS The results of published studies describing the effect of eCG in P4-GPG programmes on CR to FTAI are inconsistent and further well-designed, adequately powered studies with standardised outcome measures are required to investigate its effect.
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Affiliation(s)
| | - N Cogger
- School of Veterinary Science, Massey University, Palmerston North, New Zealand
| | - Cwr Compton
- School of Veterinary Science, Massey University, Palmerston North, New Zealand
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Sanz A, Gobikrushanth M, Colazo MG. Type of CIDR but not eCG administration affected pregnancy per AI in Holstein heifers subjected to a 5-day estrus synchronization protocol. JOURNAL OF APPLIED ANIMAL RESEARCH 2022. [DOI: 10.1080/09712119.2022.2106989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Affiliation(s)
- Albina Sanz
- Centro de Investigación y Tecnología Agroalimentaria de Aragón (CITA) - IA2 (CITA-Universidad de Zaragoza), Zaragoza, Spain
| | - Mohanathas Gobikrushanth
- Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada
| | - Marcos G. Colazo
- Department of Agricultural Food and Nutritional Science, University of Alberta, Edmonton, Canada
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Tschopp JC, Macagno AJ, Mapletoft RJ, Menchaca A, Bó GA. Effect of the addition of GnRH and a second prostaglandin F2α treatment on pregnancy per artificial insemination in lactating dairy cows submitted to an estradiol/progesterone-based timed-AI protocol. Theriogenology 2022; 188:63-70. [DOI: 10.1016/j.theriogenology.2022.05.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 05/23/2022] [Accepted: 05/24/2022] [Indexed: 10/18/2022]
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Yama P, Yadmak C, Sangkate M, Jitjumnong J, U-krit W, Promsao N, Montha N, Sudwan P, Mektrirat R, Panatuk J, Inyawilert W, Sringarm K, Lumsangkul C, Tapingkae W, Doan HV, Tang PC, Moonmanee T. In Vivo Follicular and Uterine Arterial Indices as an Indicator of Successful Hormonal Stimulation for Inactive Ovaries in Repeat-Breeder Crossbred Dairy Cows Using a Short-Term Progesterone-Based Programme. Animals (Basel) 2022; 12:ani12030292. [PMID: 35158616 PMCID: PMC8833532 DOI: 10.3390/ani12030292] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 01/17/2022] [Accepted: 01/21/2022] [Indexed: 12/04/2022] Open
Abstract
Simple Summary Blood supply of female reproductive organs plays an important role in reproductive performance in cattle. Ovarian and uterine arterial indices (vascularised area) from colour Doppler imaging provided important information about ovarian activity, supporting clinical diagnoses and reproductive management decisions in female cattle. However, the information regarding the relationship between reproductive vascular indices and resumption of follicular activity after hormonal stimulation for inactive ovaries in infertile dairy cows is scarce; thus, infertile crossbred dairy cows with inactive ovaries were induced using a 5-day progesterone-based programme. Our results highlighted that repeat-breeder crossbred dairy cows with greater follicular size and follicular and uterine arterial indices underwent a resumption of ovarian activity after hormonal stimulation. Therefore, additional information on follicular and uterine arterial indices that can be helpful in predicting the resumption of ovarian activity after hormonal stimulation in inactive ovary cows can be gained by reproductive vascularisation from colour Doppler ultrasonography. Abstract An investigation of vascularity of ovarian and uterine arteries after hormonal treatment for inactive ovaries using the short-term progesterone-based programme had not yet been explored in repeat-breeder crossbred dairy cows. To investigate the in vivo follicular and uterine arterial indices as an indicator of successful hormonal stimulation for inactive ovaries in repeat-breeder crossbred dairy cattle, 59 cows with inactive ovaries were induced with a 5-day progesterone-based protocol. At the completion of hormonal synchronisation, cows were divided into two groups according to the size of the largest follicle (LF) on their ovary: small (≤10.0 mm) and large (>10.0 mm) LFs. Vascularities of LF and uterine artery (UtA) were evaluated using a colour Doppler tool. Cows that presented with large LF had greater follicular and UtA vascular indices (p < 0.001) and pregnancy rate (p < 0.01) than cows bearing small LF on their ovary. There was a positive correlation (p < 0.001) between follicular size and LF and UtA vascular indices. Our findings highlighted that in vivo LF and UtA vascular indices at the completion of hormonal stimulation might be a promising indicator for predicting success in ovarian response to hormonal stimulation for inactive ovaries of infertile crossbred dairy cows.
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Affiliation(s)
- Punnawut Yama
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
- Department of Animal Science, National Chung Hsing University, Taichung 40227, Taiwan; (J.J.); (P.-C.T.)
| | | | - Molarat Sangkate
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
| | - Jakree Jitjumnong
- Department of Animal Science, National Chung Hsing University, Taichung 40227, Taiwan; (J.J.); (P.-C.T.)
| | - Warittha U-krit
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
| | - Nalinthip Promsao
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
| | - Napatsorn Montha
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
| | - Paiwan Sudwan
- Department of Anatomy, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand;
| | - Raktham Mektrirat
- Department of Veterinary Biosciences and Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50100, Thailand;
| | - Julakorn Panatuk
- Faculty of Animal Science and Technology, Maejo University, Chiang Mai 50290, Thailand;
| | - Wilasinee Inyawilert
- Department of Agricultural Science, Faculty of Agriculture, Natural Resources and Environment, Naresuan University, Phitsanulok 65000, Thailand;
| | - Korawan Sringarm
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
| | - Chompunut Lumsangkul
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
- Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Wanaporn Tapingkae
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
- Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Hien Van Doan
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
- Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Pin-Chi Tang
- Department of Animal Science, National Chung Hsing University, Taichung 40227, Taiwan; (J.J.); (P.-C.T.)
- The iEGG and Animal Biotechnology Center, National Chung Hsing University, Taichung 40227, Taiwan
| | - Tossapol Moonmanee
- Department of Animal and Aquatic Sciences, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand; (P.Y.); (M.S.); (W.U.-k.); (N.P.); (N.M.); (K.S.); (C.L.); (W.T.); (H.V.D.)
- Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
- Correspondence: ; Tel.: +66-53-944342
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Chambers GP, O'Sullivan ML, Gates MC. Evaluating the cost-effectiveness of diagnosing and treating phantom cows in seasonal-calving dairy herds. J Dairy Sci 2020; 103:8174-8188. [PMID: 32684469 DOI: 10.3168/jds.2019-17352] [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: 07/29/2019] [Accepted: 05/02/2020] [Indexed: 11/19/2022]
Abstract
The objective of this study was to explore the cost-effectiveness of using a progesterone-based synchrony program to manage phantom cows on seasonal-calving dairy farms. Phantom cows were defined as cows that had been artificially inseminated ≤14 d after mating start date (MSD), were not subsequently detected in estrus, and were diagnosed nonpregnant at a pregnancy diagnosis conducted approximately 49 d after MSD. Decision-tree analysis was applied to data from a previous randomized controlled trial in which phantom cows (n = 378) from spring-calving dairy farms were randomly allocated to an untreated control group or were immediately treated with a 10-d progesterone-based synchrony program with fixed-time artificial insemination. The net economic return of treating all cows presented by the farmer for pregnancy diagnosis that were diagnosed nonpregnant was compared with no intervention. The net return was calculated per cow present at MSD because the decision trees followed all cows present at MSD through to mating end date to account for farmers inadvertently presenting ineligible cows for pregnancy diagnosis and possible treatment. Probabilities, costs, and benefits of reproductive outcomes were based on published data and expert opinion. The effects of key variables on the economic return were tested by sensitivity analysis. Phantom cow intervention delivered a net return of NZ$4.451 (at the time of the study, NZ$1 = US$0.6629) per cow present at MSD. The sensitivity of pregnancy diagnosis, the proportion of ineligible cows presented by the farmer for pregnancy diagnosis, and the prevalence of phantom cows were highly influential on the net economic return from phantom cow intervention. These findings suggest that treatment of phantom cows in seasonal-calving dairy farms using a progesterone-based synchrony program is economically viable based on the current model assumptions. Accurate cow selection and pregnancy diagnosis are essential to success, and veterinarians and animal health advisors can improve the net economic return of intervention by selecting farms likely to have a higher prevalence of phantom cows based on the presence of observable risk factors.
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Affiliation(s)
- G P Chambers
- Zoetis New Zealand Limited, Level 5, 8 Mahuhu Crescent, Auckland 1010, New Zealand.
| | - M L O'Sullivan
- Veterinary Centre Limited, Oamaru, 311 Thames Street, Oamaru 9400, New Zealand
| | - M C Gates
- EpiCentre, School of Veterinary Science, Massey University, Private Bag 11 222, Palmerston North 4442, New Zealand
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Rowe SM, Pryor L, Tranter WP, Hosie J, Cavalieri J. Effect of equine chorionic gonadotropin on reproductive performance in a dairy herd in Northern Queensland, Australia. Theriogenology 2018; 125:30-36. [PMID: 30388468 DOI: 10.1016/j.theriogenology.2018.10.016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 10/16/2018] [Accepted: 10/18/2018] [Indexed: 11/16/2022]
Abstract
This study evaluated the effect of equine chorionic gonadotropin (eCG) on reproductive performance, when incorporated into the first Ovsynch + P4 synchronization following planned start mating (PSM) in pasture-based lactating dairy cows. Two synchrony programs were compared in a randomized controlled trial in Queensland, Australia. Lactating cows from a single dairy herd (n = 782) were randomly allocated to Control and eCG groups. Control cows had their estrous cycles synchronized by treatment with 100 μg gonadotropin releasing hormone (GnRH; im) and insertion of a progesterone (P4) releasing intravaginal device that contained 1.0 g of P4 on Day 0; removal of P4 device and administration of 500 μg of an analogue of PGF2α on Day 7 (cloprostenol; im); 100 μg im of GnRH on Day 9, and fixed-time artificial insemination (FTAI) on Day 10. The eCG group were treated the same as the Control group except for the addition of 400 IU of eCG, im on Day 7 of the first synchronized estrous cycle. Following the first insemination, non-pregnant cows from both groups had their estrous cycles synchronized with the same treatment protocol without using eCG. The effects of eCG on 42d cumulative incidence of pregnancy and pregnancy per AI (P/AI) were determined using logistic regression models. The effect of eCG on time to pregnancy was determined using Kaplan-Meier survival analysis and Cox proportional hazards models. Adjusted 42 d cumulative incidence of pregnancy for eCG and control groups were 47.2 and 39.3% respectively (Odds ratio [OR] = 1.38, 95% CI: 1.01-1.88). Hazard of pregnancy tended to be higher in eCG cows overall (Hazard ratio [HR] = 1.18, 95% CI: 0.99-1.41) and was significantly higher when restricting to the first 42 days after PSM (HR = 1.31, 95% CI: 1.04-1.64). Hazards of pregnancy were not different between groups when restricting to > Day 42 post PSM (HR = 1.00, 95% CI: 0.77-1.31). P/AI tended to be higher in eCG treated cows at the first AI (44.0 vs 37.7%, OR = 1.30, 95% CI: 0.94-1.78). P/AI for second and third AIs were not significantly different between groups. In this herd, a single treatment of eCG at the first synchronized estrus after PSM improved reproductive performance in the short term, but not at subsequent inseminations.
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Affiliation(s)
- S M Rowe
- Tableland Veterinary Service, PO Box 43, Malanda, QLD, 4885, Australia; Department of Veterinary Population Medicine, University of Minnesota, St. Paul, 55108, USA.
| | - L Pryor
- Boehringer Ingelheim, North Ryde, New South Wales, Australia
| | - W P Tranter
- Tableland Veterinary Service, PO Box 43, Malanda, QLD, 4885, Australia; College of Public Health, Medical and Veterinary Sciences, James Cook University, QLD, 4811, Australia
| | - J Hosie
- Tableland Veterinary Service, PO Box 43, Malanda, QLD, 4885, Australia
| | - J Cavalieri
- College of Public Health, Medical and Veterinary Sciences, James Cook University, QLD, 4811, Australia
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Randi F, Sánchez JM, Herlihy MM, Valenza A, Kenny DA, Butler ST, Lonergan P. Effect of equine chorionic gonadotropin treatment during a progesterone-based timed artificial insemination program on reproductive performance in seasonal-calving lactating dairy cows. J Dairy Sci 2018; 101:10526-10535. [DOI: 10.3168/jds.2018-14495] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 06/28/2018] [Indexed: 01/11/2023]
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10
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Yu GM, Wu Y, Wang XL, Zhao S, Maeda T, Zeng SM. Evaluation of three hormonal protocols for anovulatory lactating cows under regulations restricting the use of estrogenic compounds. Anim Sci J 2018; 89:640-647. [PMID: 29318710 DOI: 10.1111/asj.12953] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 10/04/2017] [Indexed: 11/29/2022]
Abstract
When European Union regulations restricted the use of estrogenic compounds in food-producing animals, refined hormonal protocols were no longer applicable for anovulatory cows. However, Ovsynch and its adaptations are routinely and uniformly applied to all cows regardless of ovarian function. To evaluate their efficacy on anovulatory cows, 143, 147 and 144 anovulatory cows received Ovsynch, Presynch and G6G protocols, respectively. In comparison, 150 cyclic cows were bred without using a synchronized protocol. Results showed that cows in the Presynch group had luteolysis responding to the last prostaglandin F2α (PGF2α ) injection greater than the Ovsynch group. The serous progesterone levels at the first gonadotropin-releasing hormone of Ovsych and the last PGF2α injection was greater in the G6G group than the other two hormonal treatment groups. Concentrations of Ca2+ and total protein in cervical mucus in all three hormone-treated groups before artificial insemination (AI) were significantly different from the controls. The G6G group obtained a greater pregnancy rate compared with Ovsynch and Presynch, but significantly less than the controls. For open cows in the Ovsynch group, estrus rate within 24 days after the first AI was significantly less than the controls. In conclusion, the G6G treatment resulted to better reproductive performance in anovulatory cows.
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Affiliation(s)
- Guang-Min Yu
- College of Animal Science and Technology, Yangzhou University, Yangzhou, China.,Institute of Oceanography, Minjiang University, Fuzhou, China.,Department of Bioresource Science, Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
| | - Yue Wu
- College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Xian-Long Wang
- State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Shuan Zhao
- College of Animal Science and Technology, Yangzhou University, Yangzhou, China
| | - Teruo Maeda
- Department of Bioresource Science, Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
| | - Shen-Ming Zeng
- College of Animal Science and Technology, Yangzhou University, Yangzhou, China
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Núñez-Olivera R, de Castro T, Bó GA, Piaggio J, Menchaca A. Equine chorionic gonadotropin administration after insemination affects luteal function and pregnancy establishment in postpartum anestrous beef cows. Domest Anim Endocrinol 2018; 62:24-31. [PMID: 28910675 DOI: 10.1016/j.domaniend.2017.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 07/15/2017] [Accepted: 08/10/2017] [Indexed: 10/19/2022]
Abstract
Two experiments were conducted with the aim of determining the effect of equine chorionic gonadotropin (eCG) administration on day 14 after insemination on ovarian response and pregnancy establishment in postpartum anestrous beef cows. In both experiments, cows were subjected to a progesterone- and estradiol-based treatment for fixed-time artificial insemination (FTAI) and were randomly allocated into 4 groups to receive or not receive eCG (400 IU) at the time of device removal and/or at 14 d after FTAI. In experiment 1, from day 14 to 22, daily ultrasonographic determinations were performed to monitor ovarian dynamics, and blood was collected to determine hormone concentrations in 60 cows. In experiment 2, confirmation of pregnancy was performed at 30 and 60 d after FTAI in 1,060 anestrous cows assigned to the same experimental design. Cows that received eCG on day 14 after FTAI showed increases in corpus luteum area (P < 0.01), follicle diameter (P < 0.05), serum progesterone concentrations (P < 0.01), and estradiol-17β concentrations (P < 0.01), compared with cows that did not receive eCG on day 14. Pregnancy rate on day 30 was greater in those cows that received both eCG treatments (ie, at device removal and 14 d after insemination) than in those that did not receive eCG treatment (P < 0.05). In conclusion, eCG administered on day 14 after FTAI increases serum progesterone concentrations during the critical period of pregnancy in anestrous cows, and this second eCG treatment seems to have a positive effect on achieving pregnancy.
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Affiliation(s)
- R Núñez-Olivera
- Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay
| | - T de Castro
- Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay
| | - G A Bó
- Instituto de Reproducción Animal Córdoba, Córdoba, Argentina; Instituto A.P. de Ciencias Básicas y Aplicadas, Medicina Veterinaria, Universidad Nacional de Villa María, Villa del Rosario, Córdoba, Argentina
| | - J Piaggio
- Departamento de Bioestadística, Facultad de Veterinaria, UDELAR, Montevideo, Uruguay
| | - A Menchaca
- Instituto de Reproducción Animal Uruguay, Fundación IRAUy, Montevideo, Uruguay.
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Prata AB, Pontes GC, Monteiro PLJ, Drum JN, Wiltbank MC, Sartori R. Equine chorionic gonadotropin increases fertility of grazing dairy cows that receive fixed-time artificial insemination in the early but not later postpartum period. Theriogenology 2017; 98:36-40. [DOI: 10.1016/j.theriogenology.2017.04.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 04/04/2017] [Accepted: 04/24/2017] [Indexed: 10/19/2022]
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Martinez MF, Tutt D, Quirke LD, Tattersfield G, Juengel JL. Development of a GnRH-PGF2α-progesterone-based synchronization protocol with eCG for inducing single and double ovulations in beef cattle. J Anim Sci 2015; 92:4935-48. [PMID: 25349343 DOI: 10.2527/jas.2013-7512] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Experiments were designed to investigate the effect of different doses and timing of an eCG treatment given during GnRH-based synchronization protocols on follicular dynamics and fertility in cattle. In Exp. 1, Angus heifers (n = 50) received a 7-d Ovsynch + progesterone protocol (on d 0, GnRH and progesterone insert were administered; on d 7, progesterone insert was removed and PGF2α was injected; and on d 9.5, GnRH was injected 56 h after progesterone removal) with eCG (0, 300, 500, 700, or 1,000 IU) administered on d 7. In Exp. 2, Angus cows (n = 27) received the same protocol as Exp. 1 and were assigned randomly to receive 0 or 400 IU eCG i.m. on d 2 or 7. In Exp. 3, Angus cows (n = 18) received a 6-d Ovsynch + progesterone protocol and were randomly assigned to receive 0 or 800 IU eCG on d 3 of the protocol (Exp. 3a). A pilot field trial was also performed using the same treatments in suckled Angus-cross cows (n = 72; Exp. 3b). In Exp. 4, beef heifers (n = 200) were assigned randomly to the same treatments as in Exp. 3, but the second GnRH was not given, with Holstein bulls introduced on d 6. In Exp. 5, Angus cows (n = 12) received the same treatment as in Exp. 3, but were not inseminated. Progesterone concentrations were assessed in plasma collected during the estrous cycle following synchronization. Ultrasonography was used to monitor ovarian dynamics and to diagnose pregnancy. In Exp. 1, the mean number of ovulations was affected (P < 0.02) by the dose of eCG and the stage of follicular development when administered. Treatment with eCG on d 2 tended (P < 0.08) to extend the interval from PGF2α to ovulation, but was not successful in inducing double ovulations. In contrast, eCG on d 3 increased (P < 0.01) the number of cows with double ovulation when administered i.m. and increased (P < 0.04) pregnancy rate in single ovulating heifers after bull breeding (68.0 vs. 53.1%). This treatment also elevated progesterone concentrations during the estrous cycle following synchronization. Thus, the mechanism by which administration of eCG on d 3 of the synchronization increased pregnancy rates may be through supporting development of a healthy follicle and subsequent corpus luteum capable of secreting increased concentrations of progesterone during early pregnancy. In conclusion, strategic administration of eCG during a synchronization protocol can be used to improve reproductive performance through increased pregnancy rates in single ovulating animals as well as the induction of twin ovulations for twinning.
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Affiliation(s)
- M F Martinez
- AgResearch Invermay Agricultural Centre, Dunedin 9013, New Zealand
| | - D Tutt
- AgResearch Invermay Agricultural Centre, Dunedin 9013, New Zealand
| | - L D Quirke
- AgResearch Invermay Agricultural Centre, Dunedin 9013, New Zealand
| | - G Tattersfield
- Integrated Foods Ltd., 266 Childers Road, Gisborne 4010, New Zealand
| | - J L Juengel
- AgResearch Invermay Agricultural Centre, Dunedin 9013, New Zealand
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De Rensis F, Garcia-Ispierto I, López-Gatius F. Seasonal heat stress: Clinical implications and hormone treatments for the fertility of dairy cows. Theriogenology 2015; 84:659-66. [DOI: 10.1016/j.theriogenology.2015.04.021] [Citation(s) in RCA: 100] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 04/11/2015] [Accepted: 04/11/2015] [Indexed: 12/21/2022]
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15
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Wiltbank MC, Pursley JR. The cow as an induced ovulator: Timed AI after synchronization of ovulation. Theriogenology 2014; 81:170-85. [DOI: 10.1016/j.theriogenology.2013.09.017] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2013] [Revised: 09/17/2013] [Accepted: 09/18/2013] [Indexed: 12/22/2022]
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16
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Giordano J, Edwards J, Di Croce F, Roper D, Rohrbach N, Saxton A, Schuenemann G, Prado T, Schrick F. Ovulatory follicle dysfunction in lactating dairy cows after treatment with Folltropin-V at the onset of luteolysis. Theriogenology 2013; 79:1210-7. [DOI: 10.1016/j.theriogenology.2013.02.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 02/15/2013] [Accepted: 02/16/2013] [Indexed: 10/27/2022]
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