Desempenho e caractéristicas do trato digestório de frangos de corte suplementados in ovo com treonina e glutamina

Abstract

The present research evaluated the effect of supplying the amino acids glutamine and threonine in ovo on the performance and intestinal morphology of broiler chickens. 480 eggs obtained from a commercial hatchery, from CobbMale breeders at 33 weeks of age, were distributed into four treatments, corresponding to four solutions supplemented in ovo (S1 = saline solution; S2 = 3.5% threonine solution; S3 = 3.5% glutamine solution and S4 = threonine + 3.5% glutamine solution. After hatching, the chicks were distributed in a completely randomized experimental design, with 4 replications of 10 animals each. Productive performance, small intestine length, relative organ weight and jejunum morphometry were evaluated. There was no significant difference for feed intake and body weight at 21 days of age. Birds supplemented in ovo with the combination of Gln + Thr showed greater weight gain and better feed conversion compared to the other treatments. Small intestine length, liver and gizzard weight were not different between treatments. Small intestine weight was greater for animals supplemented with the combination of Gln + Thr compared to animals inoculated with saline or threonine. The proventriculus weight was higher for glutamine treatment. Treatment with glutamine supplementation showed the highest mean for the variable villus:crypt ratio (V:C). The combination of glutamine + threonine and treatment with isolated threonine promoted an increase in the variable area of villi. Based on the available data, it can be concluded that in ovo supplementation of threonine associated with glutamine has the potential to improve performance, the development of organs of the digestive system and act trophically on intestinal development. However, additional studies are needed to validate these conclusions and deepen our understanding of the effects of these supplements.