Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattle
An estrous-detection patch was used to determine the optimum timing for STAI and the necessity of GnRH at STAI on a 7-day CO-Synch+CIDR protocol. Crossbred beef cows (n=216) were stratified into the following treatment groups: CTRL=TAI (n=67) at 72 h post CIDR removal, or TRT=STAI (n=149) at 72 or...
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| Format: | Article |
| Language: | English |
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Universidade Federal de Goiás
2023-08-01
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| Series: | Ciência Animal Brasileira |
| Online Access: | https://revistas.ufg.br/vet/article/view/75115 |
| _version_ | 1797746118758498304 |
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| author | Danilo Demeterco Ryon S. Walker Luiz Ernandes Kozicki Vitor Mohad Valle A.K. Edwards J.E. Anderson Cathleen Collet Williams |
| author_facet | Danilo Demeterco Ryon S. Walker Luiz Ernandes Kozicki Vitor Mohad Valle A.K. Edwards J.E. Anderson Cathleen Collet Williams |
| author_sort | Danilo Demeterco |
| collection | DOAJ |
| description |
An estrous-detection patch was used to determine the optimum timing for STAI and the necessity of GnRH at STAI on a 7-day CO-Synch+CIDR protocol. Crossbred beef cows (n=216) were stratified into the following treatment groups: CTRL=TAI (n=67) at 72 h post CIDR removal, or TRT=STAI (n=149) at 72 or 84 h post CIDR removal. All females received GnRH (100 mcg) plus a CIDR on d0, PGF2α, CIDR removal, and an Estrotect estrous-detector patch on d7. At 72 h post-CIDR removal, a patch score was assigned (PS1<50% removed; PS2>50% removed) to all females. Cows in the CTRL group were administered a second GnRH (100 mcg) at 72 h TAI. Cows in the TRT group with PS2 were not administered GnRH. At 84 h, the remaining TRT group cows were given a second PS; cows with PS1 received a GnRH (100 mcg), and cows with PS2 were not administered. Results: The TAI pregnancy rates were similar (P=0.81) between the CTRL (45.6%) and TRT (44.8%) groups. Pregnancy rates tended to be higher (P=0.07) for cows with PS2 (50.3%) than for those with PS1 (29.4%). However, by extending TAI to 84 h in unresponsive cows, 82.0% of TRT cows did not receive a second injection of GnRH at TAI. It was concluded that the estrous detector patches reduced the percentage of cows that required GnRH at TAI without compromising pregnancy rates. The estrous detector patches significantly reduced the number of cows that received a second GnRH injection at TAI.
Keywords: Split-time artificial insemination; STAI; GnRH; Beef cattle; heat detector.
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| first_indexed | 2024-03-12T15:33:26Z |
| format | Article |
| id | doaj.art-78717b01b95844f6a3569e6cd6a3fe55 |
| institution | Directory Open Access Journal |
| issn | 1518-2797 1809-6891 |
| language | English |
| last_indexed | 2024-03-12T15:33:26Z |
| publishDate | 2023-08-01 |
| publisher | Universidade Federal de Goiás |
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| series | Ciência Animal Brasileira |
| spelling | doaj.art-78717b01b95844f6a3569e6cd6a3fe552023-08-09T21:05:40ZengUniversidade Federal de GoiásCiência Animal Brasileira1518-27971809-68912023-08-0124Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattleDanilo Demeterco0Ryon S. Walker1Luiz Ernandes Kozicki2Vitor Mohad Valle3A.K. Edwards4J.E. Anderson5Cathleen Collet Williams6LSU AgCenter, Louisiana, United StatesMcGregor Research Center, Texas, United States and Texas A & M AgriLife Research, Texas, United StatesPontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, BrazilPontifícia Universidade Católica do Paraná (PUCPR), Curitiba, Paraná, BrazilLSU AgCenter, Louisiana, United StatesSouthern Cultured Creamery, Pontotoc, Mississippi, United StatesLSU AgCenter, Louisiana, United States An estrous-detection patch was used to determine the optimum timing for STAI and the necessity of GnRH at STAI on a 7-day CO-Synch+CIDR protocol. Crossbred beef cows (n=216) were stratified into the following treatment groups: CTRL=TAI (n=67) at 72 h post CIDR removal, or TRT=STAI (n=149) at 72 or 84 h post CIDR removal. All females received GnRH (100 mcg) plus a CIDR on d0, PGF2α, CIDR removal, and an Estrotect estrous-detector patch on d7. At 72 h post-CIDR removal, a patch score was assigned (PS1<50% removed; PS2>50% removed) to all females. Cows in the CTRL group were administered a second GnRH (100 mcg) at 72 h TAI. Cows in the TRT group with PS2 were not administered GnRH. At 84 h, the remaining TRT group cows were given a second PS; cows with PS1 received a GnRH (100 mcg), and cows with PS2 were not administered. Results: The TAI pregnancy rates were similar (P=0.81) between the CTRL (45.6%) and TRT (44.8%) groups. Pregnancy rates tended to be higher (P=0.07) for cows with PS2 (50.3%) than for those with PS1 (29.4%). However, by extending TAI to 84 h in unresponsive cows, 82.0% of TRT cows did not receive a second injection of GnRH at TAI. It was concluded that the estrous detector patches reduced the percentage of cows that required GnRH at TAI without compromising pregnancy rates. The estrous detector patches significantly reduced the number of cows that received a second GnRH injection at TAI. Keywords: Split-time artificial insemination; STAI; GnRH; Beef cattle; heat detector. https://revistas.ufg.br/vet/article/view/75115 |
| spellingShingle | Danilo Demeterco Ryon S. Walker Luiz Ernandes Kozicki Vitor Mohad Valle A.K. Edwards J.E. Anderson Cathleen Collet Williams Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattle Ciência Animal Brasileira |
| title | Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattle |
| title_full | Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattle |
| title_fullStr | Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattle |
| title_full_unstemmed | Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattle |
| title_short | Estrus response patches, timing for artificial insemination, and GnRH protocol in Split Timed AI beef cattle |
| title_sort | estrus response patches timing for artificial insemination and gnrh protocol in split timed ai beef cattle |
| url | https://revistas.ufg.br/vet/article/view/75115 |
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