Calving probability in the first and second reproductive years of beef heifers that reached the recommended body weight at first breeding season
Document title: Calving probability in the first and second reproductive years of beef heifers that reached the recommended body weight at first breeding season
Journal: Revista Brasileira de Zootecnia
Database: PERIÓDICA
System number: 000445583
ISSN: 1516-3598
Authors: 1
2
3
3
4
3
5
3
Institutions: 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
Year:
Volumen: 49
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Analítico, descriptivo
English abstract 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
Disciplines: Medicina veterinaria y zootecnia
Keyword: Bovinos,
Peso corporal,
Parto,
Charolais,
Vacas,
Novillas,
Lactancia
Keyword: Bovines,
Body weight,
Pregnancy,
Charolais,
Cows,
Heifers,
Lactation
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