| Autor: |
Kusaka H; Laboratory of Theriogenology, School of Veterinary Medicine, Kitasato University, Aomori 034-8628, Japan., Sakaguchi M; Laboratory of Theriogenology, School of Veterinary Medicine, Kitasato University, Aomori 034-8628, Japan. |
| Jazyk: |
angličtina |
| Zdroj: |
The Journal of reproduction and development [J Reprod Dev] 2024 Jun 01; Vol. 70 (3), pp. 177-183. Date of Electronic Publication: 2024 Mar 21. |
| DOI: |
10.1262/jrd.2024-005 |
| Abstrakt: |
The number of cows in estrus often influences estrus behavior; however, the effects of social order are not well documented. This study examined the effects of social order on the expression of behaviorally-scored and pedometer-detected estrus, combined with the effects of the number of cows in estrus. In a herd comprising 13 or 15 beef cattle, cows with orders 1st-7th were defined as dominant and the remaining cows as subordinate. Sole or simultaneous estrus was induced by prostaglandin F 2α analog injection and/or intravaginal progesterone treatment. Ovulation timing was determined using ultrasonography at 6-hour intervals. Estrous signs and steps of the cows were recorded 49 h before ovulation using video monitoring and a pedometer, respectively. Among the 59 treated cows, 56 behaviorally-scored estruses (27 sole and 29 simultaneous) were detected. In the sole estrus, 61.5% of the dominant-rank cows had no zero-point period; however, 35.7% of the subordinate-rank cows had that period. The dominant-rank cows in estrus alone had a significantly shorter duration of scored estrus than those in simultaneous estrus (P < 0.05). Among the 50 pedometer-detected estruses (24 sole and 26 simultaneous), the subordinate-rank cows in sole estrus had a shorter interval from estrus onset to ovulation than the dominant-rank cows in simultaneous estrus (P < 0.05). The effects of social order varied in response to the number of cows in estrus, which might have influenced determining the optimal time for artificial insemination. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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