Feed efficiency broilers at different levels of arginine in feeds

Experimentally investigated nutrient digestibility and nitrogen balance in broiler chickens cross ?Cobb-500" at different levels of arginine in the compound feed. Found that optimal performance nutrient feed were in broiler chickens, which used to feed the content of arginine 1.28% in the first growing period (1 - 10 days); 1.15% per second (11 - 22 days) and 1.11% in the third period (23 - 42 days). With an increase in the compound feed broiler content of arginine in the first growing period, from 1.24 to 1.30% there was a slight increase in thedigestibility of crude protein and fat, respectively 0.7 - 1.7 and 0.2 - 1.1 %. Digestibility of crude fiber and FNS, during this period, did not change significantly. Elevated levels of arginine in the compound feed from 1.15 to 1.21% during the second period of cultivation and from 1.11 to 1.17% in the third, helped to reduce the digestibility of essential nutrients. In particular, the digestibility of crude protein decreased by 1,1 - 3,7% (p 0,05); crude fat - 1.3 - 3.3% and FNS - to 1,4 - 3,9% (p ?0,05). In the first period of growth is nitrogen retention in the body was the highest in birds that eat feed with arginine level - 1.28%, and the second and third periods -, respectively, 1.15 and 1.11%.