The studies on characteristics of return to estrus in postpartum dairy cattle
This study attempted to determine the characteristic features of postpartum dairy cows during their return to estrus. Moreover, it investigated the effects of abnormal ovarian cycles (AOC) on subsequent reproductive performance and the relationship between normal ovarian cycles (NOC) and the blood u...
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| Format: | Article |
| Language: | English |
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The Korean Society of Animal Reproduction and Biotechnology
2021-12-01
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| Series: | Journal of Animal Reproduction and Biotechnology |
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| Online Access: | https://www.e-jarb.org/journal/view.html?uid=2591&vmd=Full |
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| author | Doo-San Kim Ji-Hwan Lee Gul-Won Jang Eun-Jeong Choi Jin-Ju Kim Ji-An Lee Jun-Kyu Son |
| author_facet | Doo-San Kim Ji-Hwan Lee Gul-Won Jang Eun-Jeong Choi Jin-Ju Kim Ji-An Lee Jun-Kyu Son |
| author_sort | Doo-San Kim |
| collection | DOAJ |
| description | This study attempted to determine the characteristic features of postpartum dairy cows during their return to estrus. Moreover, it investigated the effects of abnormal ovarian cycles (AOC) on subsequent reproductive performance and the relationship between normal ovarian cycles (NOC) and the blood urea nitrogen (BUN) level postpartum. Incidentally, 56.3% of the Holstein cows and 66.7% of the Jersey cows had NOC, whereas the 43.7% and 33.3% of the Holstein and Jersey, respectively, had AOC. Within 100 days of calving, the cows with AOC had significantly lower rates of artificial insemination (AI) submission as well as pregnancy and a significantly longer interval to first AI, as compared to that in the cows with NOC. Additionally, the cows with NOC had a significantly higher first AI conception rate than that in the cows with AOC. In this study, of the 32 Holstein cows, 8 resumed their ovarian cycle within 20 days of calving, 10 resumed the cycle with 21-40 days of calving, 8 within 41-60 days of calving, while the remaining 6 did not resume their ovarian cycles until 60 days postpartum. Furthermore, the likelihood ratios of incidence of NOC are 0.93, 1.94, and 0.38, respectively, in the groups with BUN levels < 15, 15-19.9, and ≥ 20 mg/ dl. In conclusion, AOC postpartum adversely affects reproductive performance such as AI submission rate, pregnancy rate, interval to first AI and first AI conception rate; moreover, an increase or decrease in the BUN levels beyond 15-19.9 mg/dL leads to the AOC postpartum. |
| first_indexed | 2024-12-18T05:09:48Z |
| format | Article |
| id | doaj.art-13a90066180d45549406256c8b6b1d09 |
| institution | Directory Open Access Journal |
| issn | 2671-4639 2671-4663 |
| language | English |
| last_indexed | 2024-12-18T05:09:48Z |
| publishDate | 2021-12-01 |
| publisher | The Korean Society of Animal Reproduction and Biotechnology |
| record_format | Article |
| series | Journal of Animal Reproduction and Biotechnology |
| spelling | doaj.art-13a90066180d45549406256c8b6b1d092022-12-21T21:19:54ZengThe Korean Society of Animal Reproduction and BiotechnologyJournal of Animal Reproduction and Biotechnology2671-46392671-46632021-12-0136423023810.12750/JARB.36.4.230The studies on characteristics of return to estrus in postpartum dairy cattleDoo-San Kim0https://orcid.org/0000-0002-2528-5386Ji-Hwan Lee1https://orcid.org/0000-0002-0040-3104Gul-Won Jang2https://orcid.org/0000-0003-4258-6022Eun-Jeong Choi3https://orcid.org/0000-0001-5715-2986Jin-Ju Kim4https://orcid.org/0000-0003-0772-6341Ji-An Lee5https://orcid.org/0000-0002-1774-4167Jun-Kyu Son6https://orcid.org/0000-0002-6266-3606Dairy Science Division, National Institute of Animal Science, Cheonan 31000, KoreaDairy Science Division, National Institute of Animal Science, Cheonan 31000, KoreaDairy Science Division, National Institute of Animal Science, Cheonan 31000, KoreaDairy Science Division, National Institute of Animal Science, Cheonan 31000, KoreaDairy Science Division, National Institute of Animal Science, Cheonan 31000, KoreaDairy Science Division, National Institute of Animal Science, Cheonan 31000, KoreaDairy Science Division, National Institute of Animal Science, Cheonan 31000, KoreaThis study attempted to determine the characteristic features of postpartum dairy cows during their return to estrus. Moreover, it investigated the effects of abnormal ovarian cycles (AOC) on subsequent reproductive performance and the relationship between normal ovarian cycles (NOC) and the blood urea nitrogen (BUN) level postpartum. Incidentally, 56.3% of the Holstein cows and 66.7% of the Jersey cows had NOC, whereas the 43.7% and 33.3% of the Holstein and Jersey, respectively, had AOC. Within 100 days of calving, the cows with AOC had significantly lower rates of artificial insemination (AI) submission as well as pregnancy and a significantly longer interval to first AI, as compared to that in the cows with NOC. Additionally, the cows with NOC had a significantly higher first AI conception rate than that in the cows with AOC. In this study, of the 32 Holstein cows, 8 resumed their ovarian cycle within 20 days of calving, 10 resumed the cycle with 21-40 days of calving, 8 within 41-60 days of calving, while the remaining 6 did not resume their ovarian cycles until 60 days postpartum. Furthermore, the likelihood ratios of incidence of NOC are 0.93, 1.94, and 0.38, respectively, in the groups with BUN levels < 15, 15-19.9, and ≥ 20 mg/ dl. In conclusion, AOC postpartum adversely affects reproductive performance such as AI submission rate, pregnancy rate, interval to first AI and first AI conception rate; moreover, an increase or decrease in the BUN levels beyond 15-19.9 mg/dL leads to the AOC postpartum.https://www.e-jarb.org/journal/view.html?uid=2591&vmd=Fullbunovarian cyclespostpartumprogesterone |
| spellingShingle | Doo-San Kim Ji-Hwan Lee Gul-Won Jang Eun-Jeong Choi Jin-Ju Kim Ji-An Lee Jun-Kyu Son The studies on characteristics of return to estrus in postpartum dairy cattle Journal of Animal Reproduction and Biotechnology bun ovarian cycles postpartum progesterone |
| title | The studies on characteristics of return to estrus in postpartum dairy cattle |
| title_full | The studies on characteristics of return to estrus in postpartum dairy cattle |
| title_fullStr | The studies on characteristics of return to estrus in postpartum dairy cattle |
| title_full_unstemmed | The studies on characteristics of return to estrus in postpartum dairy cattle |
| title_short | The studies on characteristics of return to estrus in postpartum dairy cattle |
| title_sort | studies on characteristics of return to estrus in postpartum dairy cattle |
| topic | bun ovarian cycles postpartum progesterone |
| url | https://www.e-jarb.org/journal/view.html?uid=2591&vmd=Full |
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