›› 2019, Vol. 46 ›› Issue (8): 2307-2314.doi: 10.16431/j.cnki.1671-7236.2019.08.014

• Animal Nutrition and Feed Science • Previous Articles     Next Articles

Effects of Low Crude Protein Diet Supplemented with Amino Acids on the Growth Performance,Blood Indexes,Nutrient Apparent Digestibility and Diarrhea Rate of Weaned Piglets

XUE Qiang1, ZHANG Heliang1, LI Xiuhua1, XUE Rong2, WANG Jun2, BAI Yanbo3   

  1. 1. College of Animal Science, Hebei North University, Zhangjiakou 075000, China;
    2. Guyuan County Agricultural and Pastoral Bureau, Zhangjiakou 076550, China;
    3. Xingtai Agricultural and Rural Bureau, Xingtai 054001, China
  • Received:2019-01-10 Online:2019-08-20 Published:2019-08-17

Abstract:

In order to study the effects of low crude protein (CP) diets supplemented with balanced amino acids on the growth performance, blood indexes, nutrients apparent digestibility, diarrhea rate of 10 to 25 kg weaned piglets, three hundred and twenty three-way cross Duroc× (Landrace×Yorkshire) piglets with body weight of 10 kg were selected and randomly divided into four treatments with four repeats per treatment and twenty pigs per repeat.The control group was fed control diet (20.1% CP), experimental group were fed CP diets supplemented with L-Lys, DL-Met, L-Thr, L-Trp, L-Val, L-Ile, L-Phe and L-His, and the CP levels of experimental diets were 18.3%, 14.9% and 13.2%, respectively.The amino acid levels of each treatment reached or exceeded the standards of nutrient requirements of swine (NRC 1998).The experiment lasted 24 days.The results showed that the ADG of weaned piglets in 20.1% CP groups was significantly higher than that in 13.2% CP treatment (P<0.05).The ADFI and F/G of weaned piglets in 18.3% CP, 14.9% CP and 13.2% CP groups were not significant different compared with 20.1% CP group (P>0.05).②The blood urea content of 20.1% CP group was the highest and that of 13.2% CP group was the lowest, and there was extremely significant difference between the two groups (P<0.01).The levels of TP, ALB, GLB, A/G, Blood glucose, insulin, IgA, IgG and IgM of 18.3% CP, 14.9% CP and 13.2% CP groups were not significant different compared with 20.1% CP group (P>0.05).③The apparent digestibility of CP in 13.2% CP and 14.9% CP groups were extremely significantly lower than that of 20.1% CP group (P<0.01);There were no significant difference of other indexes among the four groups (P>0.05).④The diarrhea rate of weaned piglets in 20.1% CP grou was the highest and that of 13.2% CP group was the lowest, and there was significant difference between the two groups (P<0.05).In conclusion, when the dietary CP level was reduced to 14.9%, the growth performance of piglets was not adversely affected.The CP apparent digestibility and blood urea level was extremely significantly decreased than that of control group (20.1% CP), and the diarrhea rate of piglets was greatly reduced.Therefore, the CP level of diet supplemented with 8 amino acids in 10-25 kg weaned piglets could be reduced to 14.9% without affecting the performance of piglets.

Key words: low CP diet; amino acids; weaned piglets; growth performance; blood indexes; diarrhea rate

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