Digestibilidades parcial e total de dietas com feno de capim-marandu e concentrado balanceadas para diferentes níveis de produção
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Data
2006-08-01
Autores
Brito, Rodolfo Marques de [UNESP]
Sampaio, Alexandre Amstalden Moraes [UNESP]
Fernandes, Alexandre Rodrigo Mendes [UNESP]
Henrique, Wignez
Cattelan, José Wanderley
Routman, Karina de Souza
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Zootecnia
Resumo
O experimento foi realizado com o objetivo de avaliar as digestibilidades parcial e total das frações digestíveis de dietas com feno de capim-marandu e concentrado utilizando-se a fibra em detergente ácido indigestível como indicador. Foram utilizados quatro tourinhos da raça Santa Gertrudes, canulados no rúmen e duodeno, distribuídos em delineamento quadrado latino 4 x 4. As dietas foram ajustadas para que os animais tivessem ganhos diários de peso corporal (GPC) de 0,5 e 1 kg/animal, associado a potenciais de fermentação microbiana de 9,5 e 11 g de PB microbiana/MJ em fermentável. Houve efeito das dietas ajustadas para potencial de GPC sobre as ingestões diárias de MS (7,05 e 8,07 kg/animal, respectivamente para 0,5 e 1,0 kg/animal de GPC), mas não daquelas balanceadas para potencial de fermentação microbiana (7,57 kg/animal). O tratamento para GPC diário de 1 kg/animal proporcionou maior digestibilidade total da matéria orgânica e de carboidratos totais (médias de 66,63 e 58,68%, respectivamente) quando comparado ao tratamento para GPC diário de 0,5 kg/animal, que apresentou, para as mesmas variáveis, médias de 61,57 e 53,94%. Os resultados não justificaram a utilização de dietas para maior potencial de fermentação microbiana. As dietas balanceadas para altos ganhos de peso, no entanto, mostraram-se melhores quanto à ingestão e ao aproveitamento dos nutrientes que as formuladas para baixos ganhos de peso.
The objective of this trial was to evaluate partial and total tract digestibilities of diets containing Brachiaria brizantha hay plus concentrate fed to young bulls. Four Santa Gertrudis young bulls fitted with duodenal and ruminal cannulae were used in a 4 x 4 Latin square. Diets were formulated to yield daily body weight gains (BWG) of 0.5 or 1 kg/animal and potential of microbial fermentation of 9.5 or 11 g of microbial crude protein/MJ fermentable metabolizable energy. Apparent digestibility of nutrients was estimated using indigestible acid detergent fiber (IADF) as the internal marker. Dry matter intake (DMI) of bulls fed the diet formulated to yield high BWG was greater (8.07 kg/day) than the DMI of bulls fed the low BWG diet, which averaged 7.05 kg/animal/day. However, DMI did not differ and averaged 7.57 kg/animal/day on diets formulated to yield different potential of microbial fermentation in the rumen. Diet formulated to yield BWG of 1 kg/animal had greater total tract digestibilities of OM and total carbohydrates than that formulated to yield BWG of 0.5 kg/animal. Results from this trial did not justify formulating diets for greater ruminal microbial fermentation. on the other hand, diet balanced for high BWG improved intake and nutrient utilization compared to that balanced for low BWG.
The objective of this trial was to evaluate partial and total tract digestibilities of diets containing Brachiaria brizantha hay plus concentrate fed to young bulls. Four Santa Gertrudis young bulls fitted with duodenal and ruminal cannulae were used in a 4 x 4 Latin square. Diets were formulated to yield daily body weight gains (BWG) of 0.5 or 1 kg/animal and potential of microbial fermentation of 9.5 or 11 g of microbial crude protein/MJ fermentable metabolizable energy. Apparent digestibility of nutrients was estimated using indigestible acid detergent fiber (IADF) as the internal marker. Dry matter intake (DMI) of bulls fed the diet formulated to yield high BWG was greater (8.07 kg/day) than the DMI of bulls fed the low BWG diet, which averaged 7.05 kg/animal/day. However, DMI did not differ and averaged 7.57 kg/animal/day on diets formulated to yield different potential of microbial fermentation in the rumen. Diet formulated to yield BWG of 1 kg/animal had greater total tract digestibilities of OM and total carbohydrates than that formulated to yield BWG of 0.5 kg/animal. Results from this trial did not justify formulating diets for greater ruminal microbial fermentation. on the other hand, diet balanced for high BWG improved intake and nutrient utilization compared to that balanced for low BWG.
Descrição
Palavras-chave
Body weight gain, indigestible acid detergent fiber, potential of microbial fermentation, fibra em detergente ácido indigestível, Ganho de peso, potencial de síntese microbiana
Como citar
Revista Brasileira de Zootecnia. Sociedade Brasileira de Zootecnia, v. 35, n. 4, p. 1796-1804, 2006.