Postpartum reproductive performance of beef cows in moderate body condition submitted to estrus induction/synchronization

Revista Brasileira de Zootecnia

Pimentel, Marcelo Alves⁴  Pimentel, Cláudio Alves¹  Brauner, Cássio Cassal²  Lemes, Jaqueline Schneider⁵  Moraes, José Carlos Ferrugem³ 

[1] UFPEL, Pelotas;Embrapa Pecuária Sul;UFPEL;UFPel

关键词: anoestrus;    milk production;    reproduction    Introdução Anestro é o fator de maior impacto negativo sobre a fertilidade pós-parto;    pois aumenta o intervalo do parto ao primeiro cio;    reduzindo a produção de bezerros e causando perdas econômicas na produção de bovinos de corte;   

DOI  :  10.1590/S1516-35982009000100013

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

To assess the reproductive performance of beef cows submitted to estrus induction/synchronization, 42 Aberdeen Angus cows with body condition 3 (1-5 scale) under extensive management were used. The milk production was estimated through the weight-suckling-weight method. For gynecological examinations, ultrasound equipment and trans-rectal palpation were used. The milk production level (above and below the average production of cows), pregnancy, prebreeding reproductive condition (CRPA), surface anoestrus (uterine tone, follicles > 10 mm and absence of CL) and deep anoestrus (no uterine tone, follicles <10 mm and absence of CL) and the estrus induction/synchronization response (RISC) were considered as constant factors. The variables analyzed were the pre-delivery, delivery weight, mating and conception weights, weaning weight, the average daily weight gain from birth to weaning and total milk production. The prebreeding reproductive condition influenced the pre-birth and birth weights, showing that the better pre-birth and birth performance favors the restoration of reproductive activity in cows with moderate body condition (CC) in the post-partum period. The classification of the pre-breeding reproductive condition in beef cows can be a resource to determine the reproductive performance of beef cows submitted to estrus induction/synchronization, since cows in surface anoestrus tend to have better response to the protocol. In beef cows with moderate body condition, the pre-birth weight performance affects the prebreeding reproductive condition, increasing the likelihood of better reproductive performance.

【 授权许可】

CC BY-NC