Effects of Different Protein Levels on the Growth Performance and Metabolic Rate of Nutrition in Broilers

The objective of this study is to determine the effect of different protein levels on the growth performance and metabolic rate of nutrition in broilers. Total 360 healthy and weight closed local broilers of 3 weeks were chosen and then divided into three groups randomly by one factor. Each group contains three handlings, each handling consists of 40 broilers. The period of experiment was 7 weeks. The metabolic experiment was performed at the 7th week. Three different protein levels were used in broilers' diet. The levels of protein were 19%, 17.5% and 16%. The results showed that the different levels of protein in crude dietary had significant difference between 19% group and the other two groups. The average daily weight gain and daily efficiency were significantly higher than that of the other two groups (P<0.05). Compared to protein levels of 19% and 16%, there was no significant difference in the metabolism of calcium (P>0.05), and the metabolic rate of the impact of phosphorus was significantly different (P<0.05). The result showed that when protein level was 19%, the growth of the local broiler was the best.