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- Title
El diámetro uterino y la actividad ovárica influyen en la presencia de estro y preñez de vaquillas de carne en un protocolo J-Synch para inseminación artificial a tiempo fijo.
- Authors
Luis Espinoza-Villavicencio, José; Palacios-Espinosa, Alejandro; Murillo-Amador, Bernardo; Ortega-Pérez, Ricardo
- Abstract
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). The presence of estrus in heifers with a larger uterine diameter was higher than in those with a smaller diameter (P=0.001). Additionally, the intensity of estrus significantly influenced gestation rates 30 days post-FTAI (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). In conclusion the uterine horn diameter and initial cyclical activity in beef heifers impact their response to the J-Synch protocol and the post-FTAI pregnancy rates.
- Publication
Revista Cientifica de la Facultade de Veterinaria, 2024, Vol 34, Issue 2, p1
- ISSN
0798-2259
- Publication type
Article
- DOI
10.52973/rcfcv-e34360