Efeitos do ácido L-Glutâmico da dieta em pintos de corte
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Data
2001-10-10
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Revista Brasileira de Zootecnia
Resumo
Com o objetivo de estudar os efeitos de diferentes níveis de ácido L-glutâmico (L-Glu) sobre as concentrações de proteínas colagenosas (PC), proteínas não-colagenosas (PNC), proteínas totais (PT), cálcio (Ca), fósforo (P), magnésio (Mg), manganês (Mn), sódio (Na) e potássio (K) nos fêmures e tíbias, um experimento foi conduzido com pintos de um dia, machos, Hubbard, criados em baterias aquecidas com piso de tela elevado, alimentados com dieta básica purificada contendo todos os L-aminoácidos essenciais, vitaminas e minerais em níveis requeridos e suplementada com 5; 7,5; 10; e 12,5% de ácido L-glutâmico (L-Glu), por um período de 14 dias. O delineamento experimental foi o inteiramente casualizado, com quatro tratamentos, cinco repetições de cinco aves cada. Os pintos alimentados com 7,5% de L-Glu apresentaram maior ganho de peso, melhor eficiência alimentar e maiores comprimentos de tíbias e fêmures. Foram necessários 12,5% de L-Glu para reduzir a um mínimo (19,92%) a incidência de deformações nas pernas, sem contudo eliminá-las. Não foi observado efeito dos níveis de L-Glu no consumo (P>0,05). Não houve efeito significativo dos tratamentos sobre os teores de PC, PT, Ca, P, Mg, Mn, Na e K nas tíbias e fêmures. Os teores de PNC das tíbias e fêmures foram significativamente maiores nos animais alimentados com 12,5% de L-Glu. Embora algumas diferenças tenham sido observadas na composição mineral dos ossos, os conteúdos se encontravam numa faixa fisiológica normal
In order to study the effects of L- glutamic acid (L-Glu) levels on contents of collagenous (CP), non collagenous (NCP) total proteins (TP) and minerals in femur and tibia of male broiler chicks, one experiment was conducted with day-old broiler chicks, male Hubbard, reared in electrically heated batteries with raised wire mesh floors and fed purified amino acid diets and water ad libitum for a 14 days period. The basal diet contained all essential L-amino acids, minerals and vitamins at requirement levels and was supplemented with 5,0; 7,5; 10,0; 12,5% L-Glutamic acid (L-Glu). Each treatment had five replicates of five chicks each. Supplementation of 7.5% L-Glu was sufficient to improve growth, feed/gain ratio and the higher tibia and femur length. To reduce leg problems to a minimum observed (19.92%) were necessary higher level of non-specific nitrogen (12,5% L-Glu). No effects were observed of L-Glu levels upon feed consumption. There was no significant dietary effect in the content of CP, TP and Ca, P, Mg, Mn, Na e K tibia and femur ash. The NCP contents of both the tibia and femur were significant higher in chicks fed 12,5% L-Glu. Increasing the dietary level of non-specific nitrogen, it was observed a tendency to increase NCP content of tibia and femur. Although some differences were observed in the mineral composition of bones, the mineral contents were in physiological range.
In order to study the effects of L- glutamic acid (L-Glu) levels on contents of collagenous (CP), non collagenous (NCP) total proteins (TP) and minerals in femur and tibia of male broiler chicks, one experiment was conducted with day-old broiler chicks, male Hubbard, reared in electrically heated batteries with raised wire mesh floors and fed purified amino acid diets and water ad libitum for a 14 days period. The basal diet contained all essential L-amino acids, minerals and vitamins at requirement levels and was supplemented with 5,0; 7,5; 10,0; 12,5% L-Glutamic acid (L-Glu). Each treatment had five replicates of five chicks each. Supplementation of 7.5% L-Glu was sufficient to improve growth, feed/gain ratio and the higher tibia and femur length. To reduce leg problems to a minimum observed (19.92%) were necessary higher level of non-specific nitrogen (12,5% L-Glu). No effects were observed of L-Glu levels upon feed consumption. There was no significant dietary effect in the content of CP, TP and Ca, P, Mg, Mn, Na e K tibia and femur ash. The NCP contents of both the tibia and femur were significant higher in chicks fed 12,5% L-Glu. Increasing the dietary level of non-specific nitrogen, it was observed a tendency to increase NCP content of tibia and femur. Although some differences were observed in the mineral composition of bones, the mineral contents were in physiological range.
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Palavras-chave
Ácido L-glutâmico, Composição química e bioquímica, Pintos de corte, Problemas de pernas