Effect of Protein Hydrolysate on Growth Performance,Blood Biochemical Indexes and Nutrient Apparent Digestibility in Growing-finishing Pigs

This experiment was aimed to study the effects of protein hydrolysate on growth performance,blood biochemical indexes and nutrient apparent digestibility in growing-finishing pigs,and determine the optimum dosage of additions.300 Doroc pig×Landrace pig×Yorkshire pig crossbreeding commercial pigs were chosen and divided into five groups with four repeats per groups and 15 pigs per repeat.The pigs in group Ⅰ (control group) were fed with basal diet,others in groups Ⅱ to Ⅴ were fed basal diet with 1%,2%,3% and 4% T30 small peptide,respectively.The test lasted for 30 d. The results showed that:①The average daily gain (ADG) of group Ⅲ was significantly higher than groups Ⅰ and Ⅴ (P<0.05), the average daily feed intake (ADFI) of group Ⅲ was significantly higher than group Ⅱ, and had no significant difference with other groups (P>0.05). ②The total protein and globulin levels of group Ⅴ were the highest that significantly higher than group Ⅱ (P<0.05),and had no significant difference with other groups (P>0.05).The urea nitrogen of group Ⅱ was significantly lower than other groups (P<0.05).③The dry matter and crude protein apparent digestibility of group Ⅴ were the highest,and the Ca and P apparent digestibility were declined in T30 supplement groups. In conclusion,the optimum adding amount of protein hydrolysate of growing pig was 1.796%.It could improve the growth performance,decrease F/G,and increase the levels of total protein and globulin.