Enzyme complex and Saccharomyces cerevisiae in diets for broilers in the initial phase

Abstract

SUMMARY This study aimed at evaluating the use of exogenous enzymes in diets with Saccharomyces cerevisiae and their impact on zootechnical performance, carcass yield, intestinal histomorphometry and of broiler diets in the initial phase. A completely randomized design was used in a 2×3 + 1 factorial arrangement, with two levels of enzyme complex (EC), (0 and 200g / ton), three yeast levels (0, 6 and 12%) and a control diet, making up seven treatments, with five replicates of 20 broilers per experimental unit. We evaluated the performance (feed intake, weight gain and feed conversion ratio), carcass yield and cuts, histomorphometry of the small intestine (height, circumference and width of villi, height and width of the crypt, thickness of the intestinal muscle wall and villi/crypt relationship). From 1 to 7 and 1 to 21 days, the inclusion of yeast led to reduced broiler performance. At 21 days, the addition of EC resulted in an increase of (p <0.05) in the thickness of the muscular wall of the duodenum and decreased the width of the crypt in the ileum. The 12% level of yeast without the EC provided a thicker jejunum intestinal muscle wall when compared to the positive control. There was no significant effect on carcass yield and cuts between treatments. In conclusion, the inclusion of yeast reduces performance from 1-21 days. The enzyme complex and yeast does not change the performance or carcass yield, however, it does bring benefits to the intestinal mucosa.

Levedura de cana-de-açúcar (Saccharomyces cerevisiae) e enzima β-mananase em dietas para frangos de corte

“…Therefore, supplementation of β-mannanase (100 g/t) in the basal diet increased the muscular wall thickness of the duodenum in birds. R. F. Sousa et al (2018) evaluated the use of exogenous enzymes in diets with Saccharomyces cerevisiae in broiler chickens aged 1-21 days and found that the intestinal muscular wall of birds that did not receive the enzymatic complex was thinner than that of birds that received the enzymatic mixture in their feed. Just like abnormal thickening, a pronounced reduction in muscular wall thickness can be attributed to a physiological response to certain external agents, such as microorganisms, pathogens, and antinutritional substances.…”