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Received: 2005-01-28

Revision Accepted: 2005-05-19

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Journal of Zhejiang University SCIENCE B 2005 Vol.6 No.8 P.793~797

http://doi.org/10.1631/jzus.2005.B0793


Effects of supplementary urea-minerals lick block on the kinetics of fibre digestion, nutrient digestibility and nitrogen utilization of low quality roughages


Author(s):  WU Yue-ming, HU Wei-lian, LIU Jian-xin

Affiliation(s):  College of Animal Sciences, Zhejiang University, Hangzhou 310029, China; more

Corresponding email(s):   ymwu@zju.edu.cn, liujx@zju.edu.cn

Key Words:  Urea-minerals lick block, Digestibility, Nitrogen utilization, Fibre digestion, Kinetics, Roughage, Sheep


WU Yue-ming, HU Wei-lian, LIU Jian-xin. Effects of supplementary urea-minerals lick block on the kinetics of fibre digestion, nutrient digestibility and nitrogen utilization of low quality roughages[J]. Journal of Zhejiang University Science B, 2005, 6(8): 793~797.

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author="WU Yue-ming, HU Wei-lian, LIU Jian-xin",
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%T Effects of supplementary urea-minerals lick block on the kinetics of fibre digestion, nutrient digestibility and nitrogen utilization of low quality roughages
%A WU Yue-ming
%A HU Wei-lian
%A LIU Jian-xin
%J Journal of Zhejiang University SCIENCE B
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%P 793~797
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T1 - Effects of supplementary urea-minerals lick block on the kinetics of fibre digestion, nutrient digestibility and nitrogen utilization of low quality roughages
A1 - WU Yue-ming
A1 - HU Wei-lian
A1 - LIU Jian-xin
J0 - Journal of Zhejiang University Science B
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2005.B0793


Abstract: 
Three yearling lambs with a rumen cannula were used to investigate the effects of supplementation with an urea-minerals lick block (ULB) on the kinetics of ruminal fibre digestion, nutrient digestibility and nitrogen (N) utilization of rice straw (RS), ammonia bicarbonate (AB)‑treated RS (ABRS) and hay prepared from natural pasture. The digestibility of dry matter and organic matter of RS increased by 13.1% and 12.7% (P<0.05) when the diet was supplemented with ULB, and approached to that of ABRS, indicating that the effect of ULB on digestibility of RS is similar to that of AB treatment. The digestibility of ABRS was slightly improved by the ULB feeding. Nitrogen retention was highest in lambs fed on ABRS alone, followed by hay with ULB, and was lowest in animals fed on RS with ULB. However, both the amount and proportion of N retention to N intake were enhanced by ULB supplementation to lambs fed on hay. The proportion of N retained to N digested decreased due to ULB supplementation to lambs fed on RS or ABRS. Supplementing ULB did not greatly influence the rumen degradation of either dry matter or crude protein in each of the three diets. RS and hay had similar values in the potential extent of digestion (PED) and digestion rate of PED (kd) of fibrous materials, but the discrete lag time for RS was lower than that for hay. The AB treatment significantly increased the PED (P<0.05) and kd (P<0.05) of RS. Neither the PED nor kd for RS and ABRS was influenced by ULB supplementation, but the kd for hay significantly increased due to ULB. The lag time for hay was also shortened by the ULB feeding. The ULB improved the digestion of fibre in the rumen of lambs fed on low quality roughage. It is inferred that while ULB is effective in increasing nutrient digestibility of low quality roughages by improving ruminal fibre digestion. A synchronized supply of N and energy to rumen microbes should be considered to improve the efficiency of N utilization when the basal diet is ammoniated straw.

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