Nitrogen Retention and Urinary Excretion of Purine Derivatives of Mutton Sheep at Different Levels of Feed Intake

MA Tao; DIAO Qiyu; DENG Kaidong; JIANG Chenggang; TU Yan; WANG Yongchao; LIU Jie; ZHAO Yiguang

doi:10.3969/j.issn.1006-267x.2012.07.007

Chinese Journal of Animal Nutrition >

2012 , Vol. 24 >Issue 7: 1229 - 1235

DOI: https://doi.org/10.3969/j.issn.1006-267x.2012.07.007

RUMINANT NUTRITION

Nitrogen Retention and Urinary Excretion of Purine Derivatives of Mutton Sheep at Different Levels of Feed Intake

MA Tao ,
DIAO Qiyu ,
DENG Kaidong ,
JIANG Chenggang ,
TU Yan ,
WANG Yongchao ,
LIU Jie ,
ZHAO Yiguang

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1. Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
2. College of Animal Science, Jinling Institute of Technology, Nanjing 210038, China

Received date: 2012-01-07

Online published: 2012-07-05

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Abstract

This experiment was aimed to investigate N retention and urinary excretion of purine derivatives (PD) of mutton sheep at different levels of feed intake. Twelve Dorper thin-tailed Han crossbred, non-castrated male lambs with an average bodyweight of (41.3 ? 2.8) kg were randomly assigned to three levels of dry matter intake: ad libitum intake, 70% of the ad libitum intake, and 40% of the ad libitum intake. The experiment lasted for 12 days (7 days for adaptation and 5 days for trial period). The results showed that the nutrient digestibility was significantly increased with decreasing feed intake (P<0.05), whereas both fecal and urinary N excretion were significantly decreased with decreasing feed intake (P<0.05). A linear relationship was found between N retention and N intake (R²=0.92). With the reduction of feed intake, urinary excretion of PD as well as microbial N (MN) yield were significantly decreased (P<0.05). Purine nitrogen index (PNI) showed the same trend as N retention and N absorption. In conclusion, there are linear equations between urinary PD excretion, digestible organic matter intake (DOMI) and also MN yield. The equations are Y=21.41X-1.81 (R²=0.94) and Y=0.91X+2.57 (R²=0.94), respectively. The combination of both N balance and PD excretion can be expressed as PNI, which can be used to evaluate utilization of dietary nitrogen.

Key words： mutton sheep; digestible organic matter intake; urinary purine derivatives; purine nitrogen index; microbial N

Cite this article

MA Tao , DIAO Qiyu , DENG Kaidong , JIANG Chenggang , TU Yan , WANG Yongchao , LIU Jie , ZHAO Yiguang . Nitrogen Retention and Urinary Excretion of Purine Derivatives of Mutton Sheep at Different Levels of Feed Intake[J]. Chinese Journal of Animal Nutrition, 2012 , 24(7) : 1229 -1235 . DOI: 10.3969/j.issn.1006-267x.2012.07.007

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