Fetal sex influence in the productive performance of dairy cows

Semina: Ciências Agrárias

Mariana Alencar Pereira¹  Manuela Pires Monteiro da Gama²  Aníbal Eugênio Vercesi Filho³  Claudia Cristina Paro de Paz³  Lenira El Faro Zadra³  Gabriela Geraldi Mendonça⁴  Guilherme Felipe Ferreira dos Santos⁵  Anielly de Paula Freitas⁵ 

[1] Associação Brasileira dos Criadores de Zebu;Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo;Instituto de Zootecnia, Agência Paulista de Tecnologia dos Agronegócios;Instituto de Zootecnia, Centro APTA de Bovinos de Corte;Instituto de Zootecnia;

关键词: Produção de leite;    Lactação;    Duração da lactação.;   

DOI  :  10.5433/1679-0359.2016v37n4Supl1p2549

来源: DOAJ

【 摘 要 】

Investigating factors that could affect milk production of cows is an important way to improve the efficiency of production systems. This purpose of this study was to verify and quantify the influence of calf sex on milk production and lactation length in herds of Holstein, Gir, and Guzera cows. Data from 10,780 lactations of 4,807 Holstein cows that calved between 2001 and 2013; 18,898 lactations of 13,172 Gir cows that calved between 1985 and 2013; and 5,277 lactations of 3,972 Guzera cows that calved between 1987 and 2013 were used. Both the accumulated 305-day milk yield (P305) and the length of the lactation period up to 305 days (DL305) were evaluated. Analysis of variance was performed by the least squares method using the GLM procedure in the SAS statistical program. The P305 was not influenced by the sex of the calf in the Holstein breed. However in the zebu breeds (Gir and Guzera), both P305 and DL305 were significantly affected (P < 0.01) by the sex of the calf, with higher production and average length of lactation in cows that calved males. In addition, a significant difference was also nested within sex of calf and age at first calving (P < 0.05) in the Gir breed. The results indicate that for the zebu breeds, calf sex influences production characteristics.

【 授权许可】

Unknown