Effects of Reducing Dietary Crude Protein Level and Supplement with Compound Enzymes on Growth Performance, Nitrogen and Phosphorus Metabolism of Finishing Pigs under High Temperature Conditions

CAI Qinghe; CHEN Yuanqing; XI Lin; WANG Yizhen; WANG Guoshui; MAO Huimin; GUO Baohai; WANG Litong; JI Cheng

doi:10.3969/j.issn.1006-267x.2014.07.005

2014 , Vol. 26 >Issue 7: 1746 - 1752

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.07.005

Swine Nutrition

Effects of Reducing Dietary Crude Protein Level and Supplement with Compound Enzymes on Growth Performance, Nitrogen and Phosphorus Metabolism of Finishing Pigs under High Temperature Conditions

CAI Qinghe ,
CHEN Yuanqing ,
XI Lin ,
WANG Yizhen ,
WANG Guoshui ,
MAO Huimin ,
GUO Baohai ,
WANG Litong ,
JI Cheng

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1. College of Animal Science, Zhejiang University, Hangzhou 310058, China;
2. College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
3. North Carolina State University, Raleigh 27695, USA;
4. Tianpeng Group Co., Ltd., Jiangshan 324111, China

Received date: 2014-02-28

Online published: 2014-07-01

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Abstract

This experiment was conducted to determine the effects of reducing dietary crude protein level and supplement with compound enzymes on growth performance, nitrogen and phosphorus metabolism of finishing pigs under high temperature conditions. One hundred and eighty crossed finishing pigs (Duroc×Landrace×Large White) with an average body weight of (74.09±2.72) kg were randomly assigned to 3 groups (5 replicates per group and 12 pigs per replicate) based on their weight and sex. Pigs in each group were randomly fed one of the three diets: regular crude protein level (16.53%) diet (control group), low crude protein level (15.14%) diet (experimental group Ⅰ), and low crude protein level diet (15.14%)+0.02% compound enzymes (experimental group Ⅱ), respectively. The experiment lasted for 45 d. The results showed as follows: compared with control group, 1) there were no significant differences in average daily grain, feed/gain, and apparent digestibility of nitrogen and phosphorus in experimental groups Ⅰ and Ⅱ (P>0.05); 2) the nitrogen excretion amount in experimental groups Ⅰ and Ⅱ was significantly decreased (P<0.05), and the phosphorus excretion amount in experimental group Ⅱ was significantly decreased (P<0.05); 3) experimental groups Ⅰ and Ⅱ had lower serum urea nitrogen content (P<0.05). These results indicate that low crude protein level diets supplemented with the compound enzymes under high temperature conditions have no significant effect on the growth performance of pigs, while significantly decrease the serum urea nitrogen content and the nitrogen and phosphorus excretion amount.

Key words： high temperature; low crude protein level diets; finishing pigs; growth performance; nitrogen; phosphorus; urea nitrogen

Cite this article

CAI Qinghe , CHEN Yuanqing , XI Lin , WANG Yizhen , WANG Guoshui , MAO Huimin , GUO Baohai , WANG Litong , JI Cheng . Effects of Reducing Dietary Crude Protein Level and Supplement with Compound Enzymes on Growth Performance, Nitrogen and Phosphorus Metabolism of Finishing Pigs under High Temperature Conditions[J]. Chinese Journal of Animal Nutrition, 2014 , 26(7) : 1746 -1752 . DOI: 10.3969/j.issn.1006-267x.2014.07.005

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