Body size in beef cows and its influence on calf production

Autores/as

DOI:

https://doi.org/10.5433/1679-0359.2020v41n6Supl2p3299

Palabras clave:

Efficiency, Frame, Milk production, Weight gain.

Resumen

Cattle farming becomes more intensive when the productive efficiency of the cows is increased, and nutrition is adjusted to the animal biotype. Eighty purebred Charolais and Nellore cows and their crosses between 3 and 7 years of age, were grouped for body weight at calving into Light (332.6 kg), Moderate (385.3 kg) and Heavy (444.6 kg). Cows and their calves were weighed at calving, at 63 days (early weaning) and at 210 days. The estimated milk production of the cows was evaluated by manual milking at 21, 42 and 63 days postpartum. The difference in the weight of the cows at calving was maintained during lactation and at 210 days postpartum. The body size of the cow did not influence milk production. Heavier cows produce heavier calves up to 365 days of age compared to lighter cows. The reproductive performance of the cows is not affected by their weight. The production of kilograms of calf for every 100 kilograms of cow at calving and weaning is higher in Light cows. The production of kilograms of calf adjusted for the pregnancy rate of the cows is higher in Heavy cows. Production efficiency in kilograms of calf per area is lower in Heavy cows.

Biografía del autor/a

Carina Crizel da Vara, Universidade Federal de Pelotas

Discente do Curso de Mestrado do Programa de Pós-Graduação em Zootecnia, Universidade Federal de Pelotas, UFPEL, Pelotas, RS, Brasil.

Magali Floriano da Silveira, Universidade Tecnológica Federal do Paraná

Profa Dra, Curso de Graduação em Zootecnia, Universidade Tecnológica Federal do Paraná, UTFPR, Dois Vizinhos, PR, Brasil.

Ricardo Zambarda Vaz, Universidade Federal de Santa Maria

Prof. Dr., Curso de Graduação em Zootecnia, Universidade Federal de Santa Maria, UFSM, Palmeira das Missões, RS, Brasil.

João Restle, Universidade Federal de Goiás

Prof. PhD, Programa de Pós-Graduação em Zootecnia, Universidade Federal de Goiás, UFG, Goiânia, GO, Brasil.

Diego Soares Machado, Universidade Federal de Santa Maria

Pesquisador, UFSM, Santa Maria, RS, Brasil.

Stefani Macari, Universidade Federal de Pelotas

Prof. Dr., Programa de Pós-Graduação em Zootecnia, UFPEL, Pelotas, RS, Brasil.

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Publicado

2020-11-06

Cómo citar

Vara, C. C. da, Silveira, M. F. da, Vaz, R. Z., Restle, J., Machado, D. S., & Macari, S. (2020). Body size in beef cows and its influence on calf production. Semina: Ciências Agrárias, 41(6Supl2), 3299–3310. https://doi.org/10.5433/1679-0359.2020v41n6Supl2p3299

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