Santos C S, Souza A R D L, Ferraz A L J, Sterza F A M, Rohod R V, Castro M F, Amorim L S, Queiroz M C E, Almeida G B, Oliveira M V M, Santos A R D, Oliveira D M
Department of Animal Science, Mato Grosso Do Sul State University, Aquidauana, Brazil.
Trop Anim Health Prod. 2025 Jun 10;57(5):255. doi: 10.1007/s11250-025-04515-3.
This study evaluated the body development, ingestive behaviour, and physiological responses of Nelore and Crossbred (Nelore × Angus/Senepol) heifers. A total of 20 heifers, approximately 12 months old, were distributed in a randomized block design and categorized into two genotypes: Nelore - 11 heifers; Crossbred (F1 Nelore × Angus/Senepol) - 9 heifers. Nelore heifers exhibited greater withers height, hip height, rump length, and substernal height, whereas Crossbred heifers had higher chest depth and average daily gain values (P < 0.05). In addition, Nelore heifers spent more time feeding and standing idle, while Crossbred heifers spent more time drinking water (P < 0.05). Nelore heifers showed (P < 0.001) higher sweating rate. The superior productive performance of the crossbred heifers, along with the similarity in respiratory and heart rates between the genotypes, highlights that the crossbreeding of Nelore and Angus/Senepol cattle is an effective strategy to boost cattle production in tropical climate regions.
本研究评估了内洛尔牛和杂交（内洛尔牛×安格斯牛/塞内波尔牛）小母牛的身体发育、采食行为和生理反应。总共20头约12月龄的小母牛采用随机区组设计进行分配，并分为两种基因型：内洛尔牛——11头小母牛；杂交牛（内洛尔牛×安格斯牛/塞内波尔牛F1代）——9头小母牛。内洛尔牛小母牛的鬐甲高度、臀高、臀长和胸骨下高度更高，而杂交牛小母牛的胸深和平均日增重更高（P<0.05）。此外，内洛尔牛小母牛用于采食和站立休息的时间更多，而杂交牛小母牛用于饮水的时间更多（P<0.05）。内洛尔牛小母牛的出汗率更高（P<0.001）。杂交牛小母牛的卓越生产性能，以及两种基因型之间呼吸频率和心率的相似性，突出表明内洛尔牛与安格斯牛/塞内波尔牛杂交是提高热带气候地区养牛业产量的有效策略。
