The effect of mannan-oligosaccharides and Enterococcus faecium M-74 bacteria in diets with different protein levels on broiler performance

摘要

Comparative feeding and group metabolic trials were conducted on sexed cockerels of ROSS hybrid to study the effect of biologicals containing mannan-oligosaccharides (b_1) and Enterococcus faecium M-74 (b_2) and their combinations (b_3) in starters BR1 (a single level of proteins) and in feed mixtures BR2 fin' broiler production with two levels of proteins (a_0 - 20.85%, a_1 - 18.22%). as exerted on growth, feed consumption and basic nutrient digestibility. The live weight of chickens receiving feed mixtures BR2 with lower protein level (a_1) was lower by 1.28% on day 35. and by 2.53% on clay 42, than in group (an) with higher protein level. The differences were statistically insignificant. The average live weight of chickens at 21 clays of age was higher by 2.3-2.2% in experimental groups b_1, b_2, b_3 in comparison with control (b_0). This difference was also statistically insignificant. The group of chickens receiving the combination of mannan-oligosaccharides and Enterococcus faecium M-74 showed the live weight higher by 4.44% at tire age of 42 days than control (b_0) at P < 0.1. The live weight of chickens was significantly (P < 0.1) higher when the bacteria Enterococcus faecium M-74 were used in diets BR2. This positive effect of biologicals on chicken weight was determined in diets BR2 with higher and lower protein levels. The statistically significantly (P < 0. 1) lowest feed consumption per 1 kg of weight gain (expressed in kg) was recorded in tire group of chickens (b_3) that received feeds with tire combination of mannan-oligosaccharides + Enterococcus faecium M-74. Tile difference against control (b_0) was (-4.87%) at 35 days of age and (-4.34%) at 42 days of age. A significant difference (P < 0.1 ) was also calculated for total feed consumption per I kg of weight gain for feeding periods I st to 35th clay and I st to 42 day of chicken age. Biologicals based on mannan-oligosaccharides and Enterococcus faecium M-74 had positive effects on the consumption of BR2 feeds at higher and lower protein levels. The effect of protein levels in BR2 diets on N retention and fiber digestibility coefficient was statistically significant. N retention was higher by 5.61% in groups of chickens receiving BR2 diets with lower protein level (a_1) at P < 0.05. Fiber digestibility of this group was higher by 19. 14% at (P < 0.1). Statistically significantly higher (P< 0.05) N retention (by 5.93%) was determined in the group of chickens receiving feeds with combinations of biologicals containing mannan-oligosaccharides + Enterococcus faecium M-74 (b_3) in comparison with control (b_0). Groups (b_2) and (b_3) had statistically significantly higher (P < 0.1) coefficients of fiber digestibility against control (b_0): by 13.14% and 14%, respectively. The lower percentage content of proteins in BR2 diets was reflected in lower N output in droppings. N output in groups of chickens receiving feeds with lower protein level (a_1) was lower by 10.03% (in g) against control (a_0). Lower average values of N output in droppings (in g) per 1 kg of weight gain were determined in groups of chickens receiving BR2 diets with tile combination of biologicals based on mannan-oligosaccharides + Enterococcus faecium M-74 (b_3).