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Os efeitos do livre acesso ao creep-feeding sobre os desempenhos produtivo e reprodutivo de vacas primíparas mantidas em pastagem nativa melhorada de azevém (Lolium multiflorum Lam.), trevo branco (Trifolium repens Lam.) e cornichão (Lotus corniculatus Lam. cv. São Gabriel) foram avaliados nesta pesquisa. O delineamento experimental foi o inteiramente casualizado composto por quatro tratamentos segundo esquema fatorial 2 x 2 (dois sexos: vacas amamentando bezerros ou bezerras; dois sistemas de alimentação: vacas amamentando bezerros (as) com ou sem acesso a creep-feeding), totalizando 16 unidades experimentais. As vacas primíparas do sistema com creep-feeding apresentaram peso corporal e escore de condição corporal, no final do experimento, mais altos que as do sistema sem creep-feeding (412 kg e 3,94 vs. 399 kg e 3,77, respectivamente). Vacas do sistema com creep-feeding tiveram ganho de peso médio diário mais elevados que o de vacas com bezerros não-suplementados (0,549 vs. 0,449 kg/dia). O creep-feeding e o sexo dos animais não influenciaram a taxa de prenhez das vacas primíparas. The research evaluated the effects of the creep-feeding on the productive and reproductive performance of the primiparous cows, maintained on improved natural pasture with ryegrass (Lolium multiflorum Lam.), white clover (Trifolium repens Lam.) and cornichão (Lotus corniculatus Lam. cv. São Gabriel). A completely randomized experimental design composed by four treatments according to 2 x 2 factorial arrangement (two sex: cows suckling male or female calves; two systems of feeding: cows suckling male or female with or without access creep-feeding, totalizing 16 experimental units. The primiparous cows of the creep-feeding system showed body weight and corporal condition, in the end of the experiment, higher in relation to the ones without creep-feeding system (412 kg and 3.94 versus 399 kg and 3.77, respectively). Cows in the creep-feeding system showed average daily weight gain higher than the cows with calves without access to creep-feeding (0.549 vs. 0.449 kg/day). Creep-feeding and the sex of calves did not influence the pregnancy rate of primiparous cows

Efeitos do livre acesso de bezerros ao creep-feeding sobre os esempenhos produtivo e reprodutivo de vacas primíparas