| Revista: | Revista Brasileira de Zootecnia |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000445583 |
| ISSN: | 1516-3598 |
| Autores: | Pacheco, Rangel Fernandes1 Restle, João2 Brondani, Ivan Luiz3 Alves-Filho, Dari Celestino3 Cattelam, Jonatas4 Mayer, Andrei Retamoso3 Martini, Ana Paula Machado5 Machado, Diego Soares3 |
| Instituciones: | 1Instituto Federal Farroupilha, Frederico Westphalen, Rio Grande do Sul. Brasil 2Universidade Federal de Goias, Departamento de Zootecnia, Goiania, Goias. Brasil 3Universidade Federal de Santa Maria, Santa Maria, Rio Grande do Sul. Brasil 4Universidade Federal da Fronteira Sul, Realeza, Parana. Brasil 5Universidade Tecnologica Federal do Parana, Dois Vizinhos, Parana. Brasil |
| Año: | 2020 |
| Volumen: | 49 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Analítico, descriptivo |
| Resumen en inglés | The objective was to evaluate factors that influence calving probability in the first and second reproductive years of beef heifers that reached the minimum recommended body weight (BW) in the first breeding season. Two hundred twenty-seven 24-month-old Charolais × Nellore heifers that mated between 2003 and 2012 were analyzed. The parameters evaluated were: year effect; individual and maternal heterozygosis; percentage of Charolais genotype; average daily gain (ADG) from weaning to the end of the first breeding season; BW at 18 and 24 months of age, end of breeding season, parturition, and weaning; Julian date of calving; and adjusted calf weight at weaning. These variables were subjected to logistic regression. Calving rates in the first and second reproductive years were 58.1 and 49.5%, respectively. Performance until the end of the first breeding season, BW before the first breeding season, and individual heterozygosis affected the calving probability in the first breeding season. In the second breeding season, BW variation from the first breeding season and calving, Julian date of calving, and BW at the end of the second breeding season influenced calving probability. Until the end of the first breeding season, ADG of beef heifers responded positively to the calving probability, even after reaching the usually recommended BW for the first breeding season. Primiparous cows calving at the beginning of the breeding season and gaining more BW between the first and second breeding season are more likely to give birth in the second breeding season |
| Disciplinas: | Medicina veterinaria y zootecnia |
| Palabras clave: | Bovinos, Peso corporal, Parto, Charolais, Vacas, Novillas, Lactancia |
| Keyword: | Bovines, Body weight, Pregnancy, Charolais, Cows, Heifers, Lactation |
| Texto completo: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
