Effects of Adding Protein Peptide to Diets on Growth Performance and Nutrient Apparent Digestibility of Growing Pigs |
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| Authors: | CUI Jia-jun ZHANG He-liang ZHANG Wei-jin ZHANG Di LI Xiu-hua |
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| Institution: | 1. College of Animal Science, Hebei North University, Zhangjiakou 075000, China;
2. Qinhuangdao Yier Biological Technology Co., Ltd., Qinhuangdao 066000, China |
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| Abstract: | The experiment was aimed to study the effects of protein peptide with different pepsin digestibility in vitro (A80,A90) on growth performance,nutrient apparent digestibility of growing pigs. Experiment 1:300 growing pigs of Duroc pig×Landrace pig×Yorkshire pig were selected and randomly divided into 5 groups with 4 repeats pre group and 15 pigs per repeat. The pig of group Ⅰ was fed with basal diet,that of groups Ⅱ to Ⅴ were fed with basal diet with 1%,2%,3%,4% A80 supplement,respectively. The experiment period lasted for 30 d. Experiment 2:240 growing pigs of Duroc pig×Landrace pig×Yorkshire pig were selected and randomly divided into 4 groups with 4 repeats pre group and 15 pigs per repeat. The pig of group Ⅰ was fed with basal diet,that of groups Ⅱ to Ⅳ were fed with basal diet with 1%,2%,3% A90 supplement,respectively. The experiment period lasted for 30 d. The results showed that the average daily gain (ADG),average daily feed intake (ADFI) and feed/gain (F/G) had no significant difference among all groups (P>0.05) in experiment 1. But the ADG had a tendency to reduce with the increase of A80. The DM,CP apparent digestibility of group Ⅱ was significant higher than that of groups Ⅰ,Ⅲ and Ⅴ (P<0.05),and had no significant difference with group Ⅳ(P>0.05). Digestibility of Ca and P showed a tendency to improve with the increase of A80,but there was no regularity. Experiment 2:With the increase does of A90,ADG was increased firstly and then decreased. The ADG of group Ⅲ was significantly higher than that of group Ⅰ(P<0.05),and had no significant difference with other groups (P>0.05).The ADFI of group Ⅲ was significantly higher than that of other groups (P<0.05).DM and CP apparent digestibility showed a tendency to decline with the increase dose of A90.In conclusion,A80 had no significant improvement on growth performance and A90 showed a quadratic improvement to pig's growth performance and the best addition percentage of protein hydrolysate in diet was 2% to 3%. |
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| Keywords: | growing pig pepsin digestibility in vitro protein peptide growth performance nutrients apparent digestibility |
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