ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (7): 1394-1404.doi: 10.11843/j.issn.0366-6964.2018.07.008

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Effect of Different Concentrates on Nutrient Digestibility and Excretion of Purine Derivatives in Urine of Mutton Sheep

FU Li-xia1,2, MA Tao1, DIAO Qi-yu1*, CHENG Shu-ru2, SONG Ya-zhe1   

  1. 1. Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    2. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China
  • Received:2017-12-11 Online:2018-07-23 Published:2018-07-23

Abstract:

The aim of this study was to establish a model for estimating microbial nitrogen with purine derivatives. Ten Dorper×thin-tailed Han crossbred, non-castrated adult rams with(47.4±4.4) kg BW were assigned to 10 experimental diet treatments with different concentrate sources in a single factor design, and 10 rams in each treatment. The experimental diet included 10 pelleted TMR with a single concentrate ratio of 30%. The experiment included 10 periods in which 10 lambs were fed with one of the 10 pelleted TMR. Each period lasted for 20 d(15 d for adaptation and 5 d for trial period) and the total experiment lasted for 200 d. This experiment study the effect of 10 different concentrates on nutrient digestibility and excretion of purine derivatives in urine of mutton sheep. The results showed that:1)The digestibility of nutrients in diets was related to the content of nutrients, and the digestibility of diets with different concentrates was different. The best predictors of dietary digestible crude protein(DCP) was crude protein(CP). The urinary nitrogen, fecal nitrogen and intake nitrogen of lambs fed 10 diets with different concentrates showed significant difference(P<0.01). 2) The proportion of allantoin, uric acid, xanthine(included hypoxanthine) in total purine derivative(PD) excretion were significantly different(P<0.01) among 10 treatments, and the ratios were 85.60%-92.47%, 2.54%-7.18%, 3.20%-7.41%, respectively. Purine nitrogen indexes were significantly different(P<0.01) among 10 treatments, and range was 0.03-0.10. However, PD excretion had a strong linear relationship with intake nitrogen and microbial nitrogen(MN). Intake N had a strong relationship with apparent digestibility of N, urine nitrogen and retained N. A linear relationship was found between retained N(Y) and intake N:Y=0.244 9×intake N-1.319 9(R2=0.825). A linear relationship was found between PD excretion and intake N:PD excretion=0.119 7×intake N+10.161(R2=0.925), and a linear relationship was found between PD excretion and MN:MN=0.746 1×PD+1.785 4(R2=0.898).

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