Influência das taxas de ganho de peso pré-desmame das vacas e do tipo de pastagem no período pós-parto sobre a eficiência biológica de vacas e de bezerros de corte
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Data
2007-04
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Zootecnia
Resumo
The objective of this experiment was to evaluate the influence of different rates of weight gain (low:
340 ± 32 g/day or moderate: 490 ± 29 g/day) of heifers, from birth until seven months of age, and the type of pasture after calving, as cows, on the biologic efficiency of cows and their calves until weaning at 217 days. After calving, the animals were maintained on native pasture (NP) or cultivated pasture (CP). During lactation, cows with low preweaning rate of weight gain showed higher milk production. Similarity between low and moderate rates of weight gain was verified for conversion of litres of milk (7.32 and 6.44 L/kg, respectively) and kg of dry matter of milk produced by cows (1.00 and 0.86 kg/kg,
respectively) into kg of calves weight gain, total requirements of net energy for maintenance (maintenance plus gestation plus milk production) of cows (TOTNEm) (2733.7 and 2316.7 Mcal, respectively), TOTNEm per kg of weaned calve (14.7 and 14.7 Mcal/kg, respectively) and kg of weaned calve per 100 kg of cow at weaning (42.0 and 38.7 kg/100 kg, respectively). However, cows with low preweaning rate of weight gain weaned more kg of calves per unit of cow metabolic weight at weaning
(1.89 vs. 1.73 kg/g).
Descrição
Palavras-chave
Charolês, Extrato seco total, Nelore, Pastagem cultivada, Pastagem nativa, Produção de leite, Charolais, Cultivated pasture, Milk yield, Native pasture, Nellore, Total dry solids extract
Citação
RESTLE, João; PACHECO, Paulo Santana; FREITAS, Aline Kellermann de; BRONDANI, Ivan Luiz; PÁDUA, João Teodoro; FERNANDES, Juliano José de Resende; ALVES FILHO, Dari Celestino. Influência das taxas de ganho de peso pré-desmame das vacas e do tipo de pastagem no período pós-parto sobre a eficiência biológica de vacas e de bezerros de corte. Revista Brasileira de Zootecnia, Viçosa, v. 36, n. 4, p. 874-880, abr. 2007.