Suplementação de glutamina em dietas iniciais para frangos de corte / Glutamine supplementation in starter diets for broilers cutting

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The objective of this study was to evaluate the supplementation of glutamine in the diet on performance, digestibility of nutrients and integrity of the intestinal mucosa of broiler chicks. Were conducted three experiments at the Veterinary School of the University Federal of Goias, using broiler chicks, male, with one day of age. In Experiment I and II was evaluated the supplementation of glutamine for chicks subjected to challenges of different intensities with Eimeria acervulina or Eimeria ssp, and in Experiment III evaluated the effect of supplementation of glutamine on diets containing ingredients of animal origin. The performance was determinated by weight, weight gain, feed intake, feed conversion rate and viability. The digestibility of nutrients was assessed with determination of digestibility coefficients of dry matter, crude protein and ether extract. The intestinal integrity was assessed by the villus height, crypt depth and villus:crypt ratio of the small intestine. The data were submitted to the analysis of variance and for the levels of glutamine was used polynomial regression. In Experiment I after the challenge with Eimeria, were observed better digestibility coefficients for dry matter, crude protein and ether extract with glutamine supplementation on 1.0% (P<0.05). For the results of histomorphometry at 14 days of age it was beneficial effect with the supplementation on 1.0% of glutamine (P<0.05) in the villus height and crypt depth in the duodenum. When challenged, the birds presented better results for villus height and crypt depth in the duodenum at 21 days of age, and in the duodenum and ileum at 28 days of age, when fed 1.0% of glutamine in the ration. In Experiment II the glutamine supplementation did not increase the digestibility coefficient of dry matter and fat on the period of this study. Nevertheless there was significant regression for the digestibility for the second period. On 21 days and 28 days of age the challenged birds showed bigger villus height and crypt depth when the birds was supplemented with 1,0% of glutamine on diet. In Experiment III there was positive quadratic effect (P<0,05) for the crude protein coefficient of digestibility with the increasing levels of glutamine in the ration. The birds belonged to the supplemented groups with glutamine presented better results (P<0,05) for villus height and crypt depth in the duodenum compared to the non-supplemented group. The level of 1,0% of glutamine in the diet presented recovery in the integrity of the small intestine on challenged birds, improving the coefficient of crude protein digestibility of the diet. The utilization of ingredients from animal source in diets for broilers in the initial phase did not harm the performance of chicks

ASSUNTO(S)

aminoácido, digestibilidade, eimeria sp, morfometria intestinal producao animal aminoacid, digestibility, eimeria sp, intestinal morphometry

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