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Zhao H, Huang Y, Shu S, Wang G, Fu C, Huang R, Zhang J, Su H, He Y, Lei C, Du L, Zhao J, Peng W. Transcriptomics and metabolomics of blood, urine and ovarian follicular fluid of yak at induced estrus stage. BMC Genomics 2024; 25:201. [PMID: 38383305 PMCID: PMC10882836 DOI: 10.1186/s12864-024-10079-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Accepted: 02/01/2024] [Indexed: 02/23/2024] Open
Abstract
To gain a deeper understanding of the metabolic differences within and outside the body, as well as changes in transcription levels following estrus in yaks, we conducted transcriptome and metabolome analyses on female yaks in both estrus and non-estrus states. The metabolome analysis identified 114, 13, and 91 distinct metabolites in urine, blood, and follicular fluid, respectively. The Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis highlighted an enrichment of pathways related to amino acid and lipid metabolism across all three body fluids. Our transcriptome analysis revealed 122 differentially expressed genes within microRNA (miRNA) and 640 within long non-coding RNA (lncRNA). Functional enrichment analysis of lncRNA and miRNA indicated their involvement in cell signaling, disease resistance, and immunity pathways. We constructed a regulatory network composed of 10 lncRNAs, 4 miRNAs, and 30 mRNAs, based on the targeted regulation relationships of the differentially expressed genes. In conclusion, the accumulation of metabolites such as amino acids, steroids, and organic acids, along with the expression changes of key genes like miR-129 during yak estrus, provide initial insights into the estrus mechanism in yaks.
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Affiliation(s)
- Huangqing Zhao
- Qinghai University, Xining, China
- Northwest A&F University, Yangling, Shaanxi, China
| | | | - Shi Shu
- Qinghai University, Xining, China
| | | | | | | | | | - Huawei Su
- China Agricultural University, Beijing, China
| | - Yang He
- China Agricultural University, Beijing, China
| | - Chuzhao Lei
- Northwest A&F University, Yangling, Shaanxi, China
| | - Lei Du
- Northwest A&F University, Yangling, Shaanxi, China
| | - Jiahao Zhao
- Northwest A&F University, Yangling, Shaanxi, China
| | - Wei Peng
- Qinghai University, Xining, China.
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Silva LOE, Motta JCL, Oliva AL, Madureira G, Alves RLOR, Folchini NP, da Silva MA, da Silva TJB, Consentini CEC, Wiltbank MC, Sartori R. Influence of GnRH analog and dose on LH release and ovulatory response in Bos indicus heifers and cows on day seven of the estrous cycle. Theriogenology 2024; 214:215-223. [PMID: 37924738 DOI: 10.1016/j.theriogenology.2023.10.015] [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: 07/10/2023] [Revised: 09/08/2023] [Accepted: 10/13/2023] [Indexed: 11/06/2023]
Abstract
This study evaluated the influence of GnRH analogs (gonadorelin vs. buserelin) and doses (single vs. double) on LH release and ovulatory response in Bos indicus (Nelore) females on Day 7 of the estrous cycle. Cycling heifers and non-lactating cows were pre-synchronized: Day -10: progesterone (P4) implant insertion plus 2 mg of estradiol benzoate; Day -2: implant removal and 0.53 mg of cloprostenol sodium (PGF); Day 0: 25 μg of lecirelin (GnRH). Over four replicates, heifers (n = 57) and cows (n = 53) that ovulated to the GnRH treatment on Day 0, having a visible corpus luteum (CL) and a dominant follicle (DF) ≥ 8.5 mm, were allocated to receive the following GnRH treatments on Day 7: G-Single (100 μg of gonadorelin); G-Double (200 μg of gonadorelin); B-Single (10 μg of buserelin); and B-Double (20 μg of buserelin). At GnRH treatment, a P4 implant was inserted in heifers (0.5 g) and cows (1 g). Ultrasound examinations were done on Days -10, -2, 0, 2, 7, 9, 12, and 14 to evaluate DF diameter, ovulation and presence of CL. Blood samples were collected on Day 7 at 0, 2, and 4 h from GnRH treatment, to evaluate circulating P4 and LH concentrations. On Day 12, the P4 implant was removed, females received two PGF treatments (24 h apart), and 2 d later, 25 μg of GnRH was given to start the next replicate. In both heifers and cows, P4 concentrations were elevated on Day 7, and similar among groups (3.9 and 4.2 ng/mL, respectively). In heifers, buserelin induced greater LH peak (9.5 vs. 2.6 ng/mL; P < 0.01) and greater ovulation (88.9 [24/27] vs. 16.7% [5/30]; P < 0.01) than gonadorelin treatments, regardless of the dose. Similarly, in cows, buserelin induced greater LH peak than gonadorelin (9.9 vs. 4.9 ng/mL; P < 0.01). However, ovulation was only increased in cows from the B-Double group (90.9% [10/11]), whereas in the other groups the ovulatory response was similar (35.7% [15/42]). Regardless of treatment, heifers had similar P4 concentrations (P = 0.22), but smaller DF (P < 0.01) than cows on Day 7. Only in G-Double group the LH peak was lower (P = 0.05) in heifers than in cows, with no difference within other groups. In heifers, but not in cows, the single dose of buserelin resulted in high ovulatory response, equivalent to that produced by the double dose. In conclusion, in Bos indicus heifers and cows on Day 7 of the cycle, with elevated P4 concentrations, buserelin induced greater LH release and ovulatory response than gonadorelin treatments. Double doses increased the LH release, however, only resulted in greater ovulation in females treated with buserelin. Finally, although circulating P4 concentrations did not differ between parities, heifers were more likely to ovulate in response to a GnRH-induced LH peak than cows.
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Affiliation(s)
- Lucas O E Silva
- Department of Animal Science, Luiz de Queiroz College of Agriculture of University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil
| | - Jessica C L Motta
- Department of Animal Science, Luiz de Queiroz College of Agriculture of University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil
| | - Abraham L Oliva
- Faculty of Higher Studies Cuautitlán, National Autonomous University of Mexico, Cuautitlán Izcalli, 54714, Mexico
| | - Guilherme Madureira
- Department of Animal Science, Luiz de Queiroz College of Agriculture of University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil
| | - Rodrigo L O R Alves
- Department of Animal Science, Luiz de Queiroz College of Agriculture of University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil
| | - Natália P Folchini
- Department of Animal Science, Luiz de Queiroz College of Agriculture of University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil
| | - Mateus A da Silva
- Department of Animal Science, Luiz de Queiroz College of Agriculture of University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil
| | - Taynara J B da Silva
- Department of Animal Science, Luiz de Queiroz College of Agriculture of University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil
| | - Carlos E C Consentini
- Department of Animal Science, Luiz de Queiroz College of Agriculture of University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil
| | - Milo C Wiltbank
- Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Roberto Sartori
- Department of Animal Science, Luiz de Queiroz College of Agriculture of University of São Paulo (ESALQ/USP), Piracicaba, SP, 13418-900, Brazil.
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Ferré LB, Jaeschke J, Gatti J, Baladón G, Bellocq E, Fernández G, Rearte R, Kjelland ME, Colazo MG, Thomas JM. Comparison of Gonadotropin-Releasing Hormone versus Estrogen-Based Fixed-Time Artificial Insemination Protocols in Grazing Bos taurus Suckled Beef Cows. Animals (Basel) 2023; 13:2803. [PMID: 37685067 PMCID: PMC10487215 DOI: 10.3390/ani13172803] [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: 08/03/2023] [Revised: 08/18/2023] [Accepted: 08/31/2023] [Indexed: 09/10/2023] Open
Abstract
Fixed-timed artificial insemination (FTAI) protocols for beef cattle in South America are primarily based on estradiol esters and intravaginal progesterone-releasing devices (IVPD). The objective of this study was to determine the optimal gonadotropin-releasing hormone (GnRH)-based protocol as an alternative to the use of estrogen-based protocols in grazing Bos taurus suckling beef cows. All cows received an IVPD on the day of protocol initiation and prostaglandin F2α (PG) plus equine chorionic gonadotropin (eCG) treatments at the time of IVPD removal. In Experiment 1, cows (n = 235) were randomly assigned to one of four treatments: (i) 7-day estradiol = 2 mg of estradiol benzoate (EB) at IVPD insertion on Day 9 and 1 mg of estradiol cypionate (ECP) at IVPD removal on Day 2; (ii) 7-day GnRH = 10 µg of GnRH at IVPD insertion on Day 10, IVPD removal on Day 3 and GnRH at FTAI; (iii) 7 & 7 estradiol = PG at IVPD insertion on Day 16, EB on Day 9 and ECP at IVPD removal on Day 2; (iv) 7 & 7 GnRH = PG at IVPD insertion on Day 17, GnRH on Day 10, IVPD removal on Day 3 and GnRH at FTAI. In Experiment 2, cows (n = 462) were randomly assigned to one of four treatments: (i) 6-day estradiol = EB at IVPD insertion on Day 9, IVPD removal on Day 3 and GnRH at FTAI; (ii) 7-day estradiol; (iii) 7-day GnRH; (iv) 7 & 7 GnRH. In Experiment 1, plasma progesterone concentrations and percentage of cows with a corpus luteum (CL) at IVPD removal, and pregnancy per AI (P/AI) were greater for cows subjected to GnRH-based protocols compared with cows subjected to estrogen-based protocols (p < 0.01). In Experiment 2, cows subjected to the 7 & 7 GnRH protocol had the greatest P/AI (p < 0.01). In summary, GnRH-based FTAI protocols resulted in similar or greater P/AI compared to estrogen-based FTAI protocols in grazing postpartum Bos taurus suckled beef cows. The greatest P/AI was attained with the 7 & 7 GnRH protocol.
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Affiliation(s)
- Luis B. Ferré
- National Institute of Agricultural Technology (INTA), Chacra Experimental Integrada Barrow (MDA-INTA), Tres Arroyos B7500, Buenos Aires, Argentina
| | - Julian Jaeschke
- Departamento Técnico de Biogénesis Bagó S.A., Garin B1619, Buenos Aires, Argentina; (J.J.)
| | - Juliana Gatti
- Departamento Técnico de Biogénesis Bagó S.A., Garin B1619, Buenos Aires, Argentina; (J.J.)
| | - Gerardo Baladón
- Departamento Técnico de Biogénesis Bagó S.A., Garin B1619, Buenos Aires, Argentina; (J.J.)
| | - Ezequiel Bellocq
- Servicio Técnico de Biogénesis Bagó S.A., Garin B1619, Buenos Aires, Argentina
| | - Gustavo Fernández
- Private Veterinary Practice, Indio Rico B7501, Buenos Aires, Argentina
| | - Ramiro Rearte
- Instituto de Investigaciones en Reproducción Animal (INIRA), Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, La Plata B1900, Buenos Aires, Argentina
| | | | - Marcos G. Colazo
- Department of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada;
| | - Jordan M. Thomas
- Division of Animal Sciences, University of Missouri, Columbia, MO 65211, USA;
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Martins T, Rocha CC, Driver JD, Rae O, Elzo MA, Mateescu RG, Santos JEP, Binelli M. What a 31-yr multibreed herd taught us about the influence of B. indicus genetics on reproductive performance of cows. J Anim Sci 2022; 100:skac366. [PMID: 36331079 PMCID: PMC9733534 DOI: 10.1093/jas/skac366] [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: 09/06/2022] [Accepted: 11/01/2022] [Indexed: 11/06/2022] Open
Abstract
Bos taurus × Bos indicus crosses are widespread in tropical and subtropical regions, nonetheless, quantitative information about the influence of B. indicus genetics on the reproductive performance of beef cattle is lacking. Herein, we determined the association between level of B. indicus genetics and reproduction from a 31-yr dataset comprising sequential breeding seasons of the University of Florida multibreed herd (n = 6,503 Angus × Brahman cows). The proportion of B. indicus genetics in this herd is evenly distributed by each 1/32nd or approximately 3-percentage points. From 1989 to 2020, the estrous cycle of cows was synchronized for artificial insemination (AI) based on detected estrus or timed-AI (TAI) using programs based on gonadotropin-releasing hormone and prostaglandin, and progestin/progesterone. All cows were exposed to natural service after AI and approximately 90-d breeding seasons, considering the day of AI as day 0. The proportion of B. indicus genetics of cows was associated negatively with pregnancy per AI, ranging from 51.6% for cows with 0%-19% of B. indicus genetics to 37.4% for cows with 81%-100% of B. indicus genetics. Similar association was found for estrous response at the end of the synchronization protocol, ranging from 66.3% to 38.4%, respectively. This reduced estrous response helped to explain the pregnancy results, once the pregnancy to AI of cows showing estrus was 2.3-fold greater than for those not showing estrus and submitted to TAI. Despite reduced pregnancy per AI, the increase in the proportion of B. indicus genetics of cows was not associated with a reduction in the proportion of pregnant cows at the end of the breeding season. Nevertheless, the interval from entering the breeding season to pregnancy was lengthened as the proportion of B. indicus genetics of cows increased. The median days to pregnancy was extended by 25 when the proportion of B. indicus genetics surpassed 78% compared with less than 20%. Thus, the increase in the proportion of B. indicus genetics of cows was related to a reduction in pregnancy per AI and lengthening the interval to attain pregnancy during the breeding season, but not with the final proportion of pregnant cows. As a result, reproductive management strategies directed specifically to cows with a greater proportion of B. indicus genetics are needed to improve the rate of pregnancy in beef herds.
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Affiliation(s)
- Thiago Martins
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
- Department of Animal and Dairy Sciences and Brown Loam Experiment Station, Mississippi State University, Mississippi, USA
| | - Cecilia C Rocha
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - Joseph Danny Driver
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - Owen Rae
- Department of Large Animal Clinical Sciences, University of Florida, Gainesville, Florida, USA
| | - Mauricio A Elzo
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - Raluca G Mateescu
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - Jose Eduardo P Santos
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
| | - Mario Binelli
- Department of Animal Sciences and D.H. Barron Reproductive and Perinatal Biology Research Program, University of Florida, Gainesville, Florida, USA
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Fontes PLP, Oosthuizen N. Applied Use of Doppler Ultrasonography in Bovine Reproduction. FRONTIERS IN ANIMAL SCIENCE 2022. [DOI: 10.3389/fanim.2022.912854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The use of Doppler ultrasonography to quantify blood vascularization in reproductive organs has increased over the past decade. Doppler technology has predominantly been explored in research settings to evaluate uterine blood flow and to assess follicular and luteal blood perfusion. Recent research has also explored the use of Doppler technology in applied reproductive management for both the beef and dairy industries and has focused on the use of luteal color Doppler ultrasonography to evaluate embryo transfer recipients and perform early pregnancy diagnosis. Although significant progress has been made and current literature indicates a strong potential for the applied use of Doppler ultrasonography to increase reproductive efficiency in the cattle industry, uptake of this technology is still currently limited. This review summarizes the recent developments in the applied use of color Doppler ultrasonography for reproductive management in both beef and dairy cattle herds.
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Maia TS, Guimarães HR, Garza V, Pohler KG, Cardoso RC, Williams GL. Early juvenile but not mid to late prenatal nutrition controls puberty in heifers but neither impact adult reproductive function. Biol Reprod 2022; 107:1035-1045. [PMID: 35703941 DOI: 10.1093/biolre/ioac123] [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: 11/29/2021] [Revised: 05/12/2022] [Accepted: 06/07/2022] [Indexed: 11/15/2022] Open
Abstract
Objectives were to test the hypothesis that pre and postnatal nutrition in the bovine female, independently or interactively, affect age at puberty and functional characteristics of the estrous cycle of sexually mature offspring. Brangus and Braford (n = 97) beef cows bearing a female fetus were fed to achieve body condition scores of 7.5-8 (H, obese), 5.5-6 (M, moderate) or 3-3.5 (L, thin) by the start of the third trimester and maintained until parturition. Heifer offspring were weaned and fed to gain weight at either a high (H; 1 kg/d) or low (L; 0.5 kg/d) rate between 4 and 8 months of age, then fed the same diet during a common feeding period until puberty which resulted in compensatory growth of heifers in the L group. Heifers (n = 95) from the H postnatal diet reached puberty two months earlier (12 ± 0.4 months; P = 0.0002) than those from the L postnatal diet (14 ± 0.4 months). Estrous cycles of a subgroup of postpubertal heifers (n = 53) were synchronized to evaluate antral follicle count (AFC), rate of growth and size of the pre-ovulatory follicle, size of corpus luteum and ovary, endometrial thickness, and plasma concentrations of progesterone and estradiol-17β (E2). Although there was a trend for postnatal H heifers to have greater AFC and plasma concentrations of E2 compared to L heifers, neither pre nor postnatal nutrition affected any other physiological or hormonal variables, including short-term fertility. Postnatal nutritional effects on pubertal age remained the dominant observed feature.
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Affiliation(s)
- Tatiane S Maia
- Animal Reproduction Laboratory, Texas A&M AgriLife Research, Beeville, Texas 78108, USA.,Department of Animal Science, Texas A&M University, College Station, Texas 77843, USA
| | - Higor R Guimarães
- Animal Reproduction Laboratory, Texas A&M AgriLife Research, Beeville, Texas 78108, USA
| | - Viviana Garza
- Animal Reproduction Laboratory, Texas A&M AgriLife Research, Beeville, Texas 78108, USA.,Department of Animal Science, Texas A&M University, College Station, Texas 77843, USA
| | - Ky G Pohler
- Department of Animal Science, Texas A&M University, College Station, Texas 77843, USA
| | - Rodolfo C Cardoso
- Department of Animal Science, Texas A&M University, College Station, Texas 77843, USA
| | - Gary L Williams
- Animal Reproduction Laboratory, Texas A&M AgriLife Research, Beeville, Texas 78108, USA.,Department of Animal Science, Texas A&M University, College Station, Texas 77843, USA
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Filho JT, Pfeifer LFM, Hoefle CA, Rodrigues MF, Ferreira R. Effect of calving to timed artificial insemination interval on fertility of beef cows. Reprod Domest Anim 2022; 57:936-942. [PMID: 35559583 DOI: 10.1111/rda.14156] [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: 01/30/2022] [Accepted: 05/09/2022] [Indexed: 11/28/2022]
Abstract
The objectives of this study were to determine the effect of calving to timed artificial insemination (C-TAI) interval on fertility of Bos taurus and Bos indicus cows, and to determine the best C-TAI interval to include postpartum cows in TAI programs in each genotype (B. taurus and B. indicus). In experiment 1, a retrospective study was performed, with data from 2709 TAI in Bos taurus and Bos indicus cows with different C-TAI intervals. There was a positive linear effect of C-TAI interval on the pregnancy probability (P < 0.0001). However, there was no effect or interaction with the genotype. When C-TAI intervals were grouped in classes, pregnancy rate differed in groups (P < 0,05). Receiver operating characteristic (ROC) analysis was performed and it was observed that 52 days would be the better C-TAI interval to maximize fertility in beef cows. According to previous result, we further stratified into two C-TAI interval groups (≤ 52 days or > 52 days). Cows with C-TAI longer than 52 days (C-TAI>52) had greater pregnancy rate (56%) than cows with short C-TAI (46%; P < 0.01). In experiment 2, 18 postpartum beef cows were subjected to TAI protocol at different C-TAI intervals (n = 6 cows per group): 40, 60 or 80 days postpartum. Cows with 60 days of C-TAI had a greater preovulatory follicle diameter than cows with 80 days postpartum (P < 0.05). The C-TAI interval did not affect (P > 0.05) the ovulation rate nor the proportion of endometrial polymorphonuclear leukocytes. We conclude that C-TAI interval affects pregnancy rate in both Bos taurus and Bos indicus. We recommend a C-TAI interval longer than 52 days to increase fertility of beef cows included in TAI programs.
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Affiliation(s)
- Juarez Tomazi Filho
- Department of Animal Science, Santa Catarina State University, Chapecó, SC, Brazil
| | | | | | | | - Rogério Ferreira
- Department of Animal Science, Santa Catarina State University, Chapecó, SC, Brazil
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Zi XD, Xiong Y, Wu JB, Gige MT, Zhao SB, Yu ZH, Lu Y, Qiao YS. Dynamic changes in gene expression during follicle development and the efficacy of four timed AI protocols in non-suckling female yaks ( Bos grunniens). Anim Biotechnol 2022:1-7. [PMID: 35133936 DOI: 10.1080/10495398.2022.2030346] [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: 11/01/2022]
Abstract
The objectives of the study were to investigate changes in the mRNA expression levels of five genes during antral follicle development and to assess the efficacy of four timed-artificial insemination (TAI) protocols in female yaks (Bos grunniens). RT-qPCR analysis revealed that expression levels were greater for follicle-stimulating hormone receptor and bone morphogenic protein 15 in the small follicle, luteinizing hormone receptor, and kit ligand in the large follicle, and growth differentiation factor 9 in the medium follicle (p < 0.05). Non-suckling yaks were treated as a 7-d CIDR, and PGF2α + eCG at CIDR withdrawal and TAI with frozen yak semen at 56-58 h after PGF2α (PPe-7d); either a 7-d CIDR (PPG-7d) or a 5-d CIDR (PPG-5d), and PGF2α at CIDR withdrawal and TAI + GnRH at 70-72 h after PGF2α; and GnRH treatment on Day 0, followed by PGF2α on Day 7 and TAI + GnRH on Day 9 (GPG-7d). The results showed that the pregnancy rate (P/AI) was greater in PPG-5d than in GPG-7d (p < 0.05), but the P/AI was not different among the other TAI protocols. In conclusion, the expression levels of these genes in follicles are dynamically changed during antral follicle development in yaks. The PPG-5d protocol achieved a greater P/AI.
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Affiliation(s)
- Xiang-Dong Zi
- The Key Laboratory of Animal Science of State Ethnic Affairs Commission, Southwest Minzu University, Chengdu, China
| | - Yan Xiong
- The Key Laboratory of Animal Science of State Ethnic Affairs Commission, Southwest Minzu University, Chengdu, China
| | - Jin-Bo Wu
- Institute of Animal Science and Veterinary Medicine of Aba Prefecture, Sichuan, China
| | - Mo-Ti Gige
- The Key Laboratory of Animal Science of State Ethnic Affairs Commission, Southwest Minzu University, Chengdu, China
| | - Shou-Bao Zhao
- Datong Yak Breeding Farm of Qinghai Province, Xining, China
| | - Zhong-Hua Yu
- Institute of Animal Science and Veterinary Medicine of Aba Prefecture, Sichuan, China
| | - Yong Lu
- Institute of Animal Science and Veterinary Medicine of Aba Prefecture, Sichuan, China
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E Silva LO, Valenza A, Alves RLOR, Silvestri M, Contini MC, Motta JCL, Drum JN, de Souza AH, Sartori R. Progesterone release profile and follicular development in Nelore cows receiving intravaginal progesterone devices. Theriogenology 2022; 178:77-84. [PMID: 34801768 DOI: 10.1016/j.theriogenology.2021.11.005] [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: 09/06/2021] [Revised: 11/07/2021] [Accepted: 11/08/2021] [Indexed: 10/19/2022]
Abstract
This study aimed to evaluate the progesterone (P4) release profile provided by four commercially available intravaginal P4 devices, as well as the effect of circulating P4 concentrations exclusively from these devices on the development of the dominant follicle (DF) in Nelore (Bos indicus) cows. Therefore, non-lactating multiparous Nelore cows were enrolled in an experimental design, over three replicates, starting on Day -9 with the insertion of a reused P4 device (2 g - original P4 load) for 7 d, followed by two treatments of cloprostenol sodium (PGF; 0.482 mg), 24 h apart, on Days -3 and -2. Just before device removal, on Day -2, a norgestomet ear implant was inserted and, 2 d later (Day 0), at the time of norgestomet withdrawal, cows were randomly assigned to receive one of the intravaginal devices: Primer (0.5 g); Prociclar (0.75 g); Sincrogest (1 g); or CIDR (1.9 g), and 2 mg of estradiol benzoate (EB) im. Blood samples were collected immediately before P4 device insertion, 12 h later and daily over 15 d (1 d after P4 device removal). Ultrasound examinations were performed on Days 0, 7, 8, 9, 10, 12, and 14 to evaluate ovarian dynamics. Results are presented as mean ± SEM and differences were considered when P ≤ 0.05. Overall, the devices resulted in distinct circulating P4 concentrations over 10 d, varying according to their initial P4 load and P4 impregnated surface area. Primer provided the lowest circulating P4 concentrations over time, whereas, CIDR had the greatest concentration. Sincrogest and Prociclar were similar, producing intermediary circulating P4. There was no effect of treatment on the DF diameter on any specific day, nor on follicular growth rate from Day 7-10. However, the Primer device resulted in a greater mean DF diameter over time. Additionally, greater circulating P4 concentrations, mainly during the first 3 d of device insertion, were associated with smaller DF diameters regardless of the treatment. In conclusion, results from this study provided a better understanding of the P4 profile of intravaginal P4 devices, as well as, their effect on DF development in Bos indicus cows. These data contribute to optimize the use of P4 devices in the reproductive management of beef cattle.
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Affiliation(s)
- Lucas Oliveira E Silva
- Department of Animal Science, Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo, Piracicaba, SP, 13418-900, Brazil
| | | | | | | | | | - Jéssica Cristina Lemos Motta
- Department of Animal Science, Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo, Piracicaba, SP, 13418-900, Brazil
| | - Jéssica Nora Drum
- 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.
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Reese ST, Franco GA, Schubach KM, Brandao AP, West SM, Cooke RF, Cardoso RC, Williams GL, Pohler KG. Induced prostaglandin release alters steroid concentrations but not pregnancy survival in cows. Domest Anim Endocrinol 2021; 74:106514. [PMID: 32693342 DOI: 10.1016/j.domaniend.2020.106514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 06/17/2020] [Accepted: 06/17/2020] [Indexed: 11/27/2022]
Abstract
Embryonic mortality (EM) is a major factor limiting reproductive efficiency in cattle, and despite negative connotations related to reproductive performance, prostaglandin F2α (PGF2α) is capable of being released by the uterus by Day 30 of gestation. Therefore, the objective was to evaluate differences in PGF2α release after an oxytocin challenge between cows with high circulating concentrations of pregnancy-associated glycoproteins (PAGs) vs low PAG because of the association of increased PAG concentrations with pregnancy success. At Day 30 of gestation, pregnant cows were divided into oxytocin treatment (OT; n = 13) and control (CON; n = 12) groups. Treatment cows were further subdivided by circulating PAG concentration (high PAG, n = 7; and low PAG, n = 6). Blood samples were collected every 30 min beginning 1 h before oxytocin administration and continuing for 4 h. Prostaglandin F2α metabolite (PGFM), progesterone, estradiol-17β (E2), and PAG concentrations were quantified. The peak concentration of PGFM occurred 2 h after oxytocin injection in treatment animals and returned to baseline levels by 4 h. No correlations were observed between PAG and PGFM, progesterone, or E2 concentrations (P > 0.05). There was no difference in initial or final PGFM concentrations between groups (P > 0.05). Progesterone and E2 concentrations decreased in cows after treatment of oxytocin (P < 0.05); however, only progesterone returned to basal concentrations by the end of the sampling period. In summary, cows with high vs low PAG concentrations at Day 30 of gestation have a similar PGFM response to oxytocin challenge.
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Affiliation(s)
- S T Reese
- Pregnancy and Developmental Programming Area of Excellence, Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - G A Franco
- Pregnancy and Developmental Programming Area of Excellence, Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - K M Schubach
- Pregnancy and Developmental Programming Area of Excellence, Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - A P Brandao
- Pregnancy and Developmental Programming Area of Excellence, Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - S M West
- Pregnancy and Developmental Programming Area of Excellence, Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - R F Cooke
- Pregnancy and Developmental Programming Area of Excellence, Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - R C Cardoso
- Pregnancy and Developmental Programming Area of Excellence, Department of Animal Science, Texas A&M University, College Station, TX, USA
| | - G L Williams
- Pregnancy and Developmental Programming Area of Excellence, Department of Animal Science, Texas A&M University, College Station, TX, USA; Animal Reproduction Laboratory, Texas A&M AgriLife Research, Beeville, TX, USA
| | - K G Pohler
- Pregnancy and Developmental Programming Area of Excellence, Department of Animal Science, Texas A&M University, College Station, TX, USA.
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