| Autor: |
J. Denis-Robichaud, A.P. Oliveira, A. Sica, S. Soriano, R.L. Araújo, M.H.C. Pereira, K.G. Pohler, R.L.A. Cerri, J.L.M. Vasconcelos |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Journal of Dairy Science, Vol 107, Iss 10, Pp 8582-8591 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
0022-0302 |
| DOI: |
10.3168/jds.2024-24792 |
| Popis: |
ABSTRACT: In this study, the main objective was to assess if long luteal phases could have causes other than pregnancy loss. We enrolled Holstein dairy cows ≥50 DIM from a commercial herd in Brazil from October 2016 to August 2017. All cows received an estradiol-based synchronization protocol, and, on the day of insemination (d 0), were randomly assigned either an AI or a placebo insemination (PBO) in a 3:1 ratio. An ultrasound was used to assess the presence of a corpus luteum (CL) on d 17, 24, and 31, which, combined to the information from patches for the detection of estrus, was used to determine the length of the luteal phase following AI or PBO. Pregnancy was assessed by ultrasound on d 31 and cows that were pregnant were excluded from the analyses. The length of the estrous cycles was categorized as short ( |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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