The uterine diameter and ovarian activity influence the presence of estrus and pregnancy in beef heifers under a J-Synch protocol for fixed-time artificial insemination

被引:0
|
作者
Espinoza-Villavicencio, Jose Luis [1 ]
Palacios-Espinosa, Alejandro [1 ]
Murillo-Amador, Bernardo [2 ]
Ortega-Perez, Ricardo [1 ]
机构
[1] Univ Autonoma Baja California Sur, La Paz, Baja California, Mexico
[2] Ctr Invest Biol Noroeste SC, La Paz, Baja California, Mexico
来源
REVISTA CIENTIFICA-FACULTAD DE CIENCIAS VETERINARIAS | 2024年 / 34卷 / 02期
关键词
Beef heifers; uterine development; cyclical activity; FTAI; GONADOTROPIN-RELEASING-HORMONE; OVULATORY FOLLICLE; ESTRADIOL CYPIONATE; ESTROUS RESPONSE; SIZE; PROGESTERONE; SYNCHRONIZATION; EXPRESSION; PROSTAGLANDIN-F2-ALPHA; PREDICTOR;
D O I
10.52973/rcfcv-e34360
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
The study assessed how the diameter of uterine horns and cyclical activity in beef heifers influence their estrous behavior and gestation rates with fixed-time artificial insemination (FTAI). A total of 100 B. taurus heifers (undefined crosses of Angus, Charolais, and Gelbvieh) weighing 300 +/- 32 kg were evaluated for their body condition (scale 1 to 5), uterine horn diameter (1: less than 1 cm; 2: 1 to 1.5 cm; 3: greather than 1.5 cm), and cyclical activity at the start of the protocol. Cyclical activity was classified into cycling (C), superficial anestrus (AS), or deep anestrus (AP). The J-Synch protocol was used for ovulation synchronization, with estrous activity monitored through paint at the base of the tail. The results showed that 81% of the cyclin (C) heifers exhibited estrus within 72 hours of completing the protocol, significantly surpassing AS and AP heifers (P <= 0.001). P <= 0.001). The presence of estrus in heifers with a larger uterine diameter was higher than in those with a smaller diameter (P <= 0.001). P <= 0.001). Additionally, the intensity of estrus significantly influenced gestation rates 30 days post-FTAI (P <= 0.003). P <= 0.003). Cyclical activity and the diameter of the uterine horns at the start of the treatment also affected pregnancy rates (P <= 0.05). P <= 0.05). In conclusion the uterine horn diameter and initial cyclical activity in beef heifers impact their response to the J-Synch protocol and the rates.
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页数:7
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