Navegando por Autor "Duarte, Marcio de Souza de"

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    Effect of feeding strategies on weaning weight and milk production of Holstein × Zebu calves in dual purpose milk production systems
    (Tropical Animal Health and Production, 2015-08) Menezes, Gustavo Chamon de Castro de; Valadares Filho, Sebastião de campos; Detmann, Edenio; Zanetti, Diego; Mariz, Lays Débora Silva; Duarte, Marcio de Souza de; Menezes, Arismar de Castro; Villalobos, Nicolas Lopez; Ruas, José Reinaldo Mendes; Morris, Stephen
    The objective of this study was to evaluate the effect of five feeding strategies on calf weaning weight, and cow milk production and composition in Brazilian Holstein × Zebu cows. A total of 60 cows and their calves were allocated to each of five treatments. Cows in treatments 1, 2 and 3 were milked for 270 days and cows in treatments 4 and 5 were milked for 180 days. Calves in treatment 1 (CON) were not supplemented with concentrate whereas calves from treatment 2 (CLPN) received 1 kg of concentrate daily from 90 to 270 days of age and calves from treatment 3 received 1 kg of concentrated from 180 to 270 days of age. Calves in treatment 4 (CCPS) were supplemented with 1 kg of concentrate from 90 to 180 days of age and calves in treatment 5 (CLPS) were supplemented with 1 kg of concentrate from 90 to 270 days of age. Calves from the CLPS treatment had greater milk and protein intakes (P < 0.05) and greater growth rate than calves from the other treatments. Our results indicate that the traditional system of feeding calves with no concentrate results in a weight gain of 600 g/day. The CLPS treatment produced calves with the highest live weight and growth rate. The nutritional strategy with restricted supply of milk for the calves with concomitantly short-term concentrate supplementation does not improve performance of calves but did increase feed costs.