| The purpose of this experiment is to investigate the low protein diet (crude protein in each stage decreased 1.5%) on growth performance, blood biochemical indexes and nutrient digestibility and economic benefit of broilers. The experiment using a large sample of single factor completely randomized trial design, selection of Jinzhou Yixian Ju Liang Tun Xiang Dacheng Group to provide healthy, disease-free, good condition, chick weight (44.41+1.20) g, there were no significant differences in the AA+broiler chicks 10000, were randomly divided into 2 groups. Each treatment group eight replicates of 625. Combined with the large sample test, comprehensive economic benefit factor experimental design only two treatment groups. The processing a, the control group, treatment for the experimental group, in the different stages of feeding amino acid balance of crude protein at different levels of the basal diet, crude protein levels:1 to 21 days of age, control group of 21%,19.5%in the experimental group; 22 to 42 days old, control group 19%. The experimental group was 17.5%. The test for a period of 42 days, the broiler growth performance, blood biochemical indexes and nutrient digestibility and economic benefit index to study the low protein diet on broiler growth performance, blood biochemical indexes and nutrient digestibility and economic benefit determination. The test results show that:1. In terms of growth performance, low protein diets in broilers average daily gain, average daily production intake, feed conversion ratio and survival rate index of the was no significant difference compared with the control group (P>0.05).2. In the blood biochemical index compared with the control group, low protein diets significantly reduced in the 21 day old broilers serum urea nitrogen (BUN) levels (P<0.01), increase significantly the 21 and 42 days of age of blood in broilers) and low density lipoprotein cholesterol (LDL-C) levels (P<0.05); on the other blood biochemical index (TC, TG, UA, CA, P, ALP, HDL-C, TP, ALB, ATG) content level difference was not significant (P>0.05).3. In terms of blood immune index compared with the control group, low egg day low protein diet reduces the content of 21 day old broilers blood GSH-Px, T-AOC, MDA, IgG index, improve the T-SOD, IgA, IgM index content (P>0.05); low protein diet reduces the 42 day old broilers blood MDA content, improve the index of IgG, IgA, IgM, SOD, T-AOC, GSH PX content (P>0.05).4. In nutrient digestibility, and compared with the control group, low protein diets significantly reduces the content of broilers at the age of 14 days and 21 days of age in feces of crude protein (CP) and 14 day old broiler manure phosphorus (P) content (P<0.01); the other day old faecal CP and P levels was not significant (.P>0.05). Low protein diets significantly increased the at the age of 14 days and 28 days of age, the 42 day old dry matter utilization rate (P<0.01); on broiler CP and P utilization rate effect was not significant (P>0.05).5 in the aspect of economic benefit, compared with the control group, low protein diets improve broilers and broiler European efficiency index only economic benefits, but the difference was not significant (P>0.05).To sum up, low protein diet (each stage experimental diets reduce 1.5% protein) at broilers growth performance, blood biochemical index was not significantly affected, but low protein diet improves the CP, P and dry material digestibility, reduced the content of CP and P in fecal, once again confirms the feasibility of low protein diets and the importance of energy saving and emission reduction, and at the same time, improve the economic benefit, for low protein diets scientific experiments accumulated practical experience in the production, to further promote and lay the foundation. |
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