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Previous issue date: 2006-03-14 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior === The objective of this trial was to evaluate the effects of a prebiotic, composed of citric acid,
linoleic acid, oleic acid, yeast cell wall, citric fruit extracts and vitamin C, added to the whole
milk and to the post weaning concentrate of 20 Holstein or Holstein-Zebu crossbred males
and females calves, from birth to 120 days of age. Calves were assigned to a 2x2 factorial
with the following experimental treatments: (1) milk and post weaning concentrate without
prebiotic; (2) milk with and post weaning concentrate without prebiotic; (3) milk without and
post weaning concentrate with prebiotic; and (4) milk and post weaning concentrate with
prebiotic. Prebiotic concentration in whole milk was 0.5%, added just before feeding, and
0,04% on the post weaning concentrate. Calves were kept in individual hutches throughout
the trial. They were fed 5 kg of milk/animal/day for 56 days, and a starter (18% crude
protein) was offered ad libitum during this period. After weaning, the only available feed was
a concentrate (19% crude protein) offered up to 2 kg/animal/day. Prebiotic did not affect
(P>.05) average daily weight gain, feed intake and feed efficiency. === Objetivou-se avaliar os efeitos de um prebi?tico, constitu?do de ?cido c?trico, ?cido linoleico,
?cido ol?ico, parede celular de levedura, extrato de frutas c?tricas e vitamina C, no leite e no
concentrado p?s desaleitamento de bezerros. Foram utilizados 20 animais, machos e f?meas
da ra?a Holand?s, ou mesti?os Holand?s-Zebu, do nascimento aos 120 dias de idade. Num
esquema fatorial 2x2, foram comparados os seguintes tratamentos experimentais: (1) leite e
concentrado p?s desaleitamento sem prebi?tico; (2) leite sem prebi?tico e concentrado p?s
desaleitamento com prebi?tico; (3) leite com prebi?tico e concentrado p?s desaleitamento sem
prebi?tico; e (4) leite e concentrado p?s desaleitamento com prebi?tico. Na fase de
aleitamento, o prebi?tico foi misturado ao leite na propor??o de 0,5%, no momento do
fornecimento; no concentrado p?s-desaleitamento, ele foi utilizado na propor??o de 0,04%,
misturado no momento da prepara??o do concentrado. Os animais foram mantidos em abrigos
individuais durante todo o ensaio. Durante a fase de aleitamento (56 dias) receberam cinco
litros de leite/animal/dia e concentrado inicial ? vontade. Ap?s o desaleitamento, os animais
eram alimentados somente com o concentrado, limitado a dois kg/animal/dia. O fornecimento
do prebi?tico no leite ou no concentrado n?o influenciou (P>0,05) o ganho de peso, o
consumo de alimentos, a efici?ncia alimentar.
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