Effects of calcium propionate on rumen fermentation, urinary excretion of purine derivatives and feed digestibility in steers
文献类型： 外文期刊
作者： Liu, Q. 1 ; Wang, C. 1 ; Guo, G. 1 ; Yang, W. Z. 1 ; Dong, K. H. 1 ; Huang, Y. X. 1 ; Yang, X. M. 3 ; He, D. C. 3 ;
作者机构： 1.Shanxi Agr Univ, Coll Anim Sci & Vet Med, Taigu 030801, Shanxi, Peoples R China
2.Agr & Agri Food Canada, Res Ctr, Lethbridge, AB, Canada
3.Shanxi Acad Agr Sci, Inst Anim Sci, Taiyuan 030032, Shanxi, Peoples R China
期刊名称：JOURNAL OF AGRICULTURAL SCIENCE （ 影响因子：1.476； 五年影响因子：1.891 ）
ISSN：
年卷期：
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收录情况： SCI
摘要： The objective of the current study was to evaluate the effects of calcium propionate supplementation on rumen fermentation, urinary excretion of purine derivatives (PD) and feed digestibility in the total gastrointestinal tract of steers. Eight ruminally cannulated Simmental steers (462pl14 kg) were used in a replicated 4x4 Latin square arrangement of treatments with experimental periods of 21 days. The treatments were: control (without calcium propionate), LCaP (calcium propionate - low), MCaP (calcium propionate - medium) and HCaP (calcium propionate - high) with 100, 200 and 300 g calcium propionate per steer per day. Diet consisted of 0p"60 maize stover and 0p"40 concentrate (dry matter (DM) basis). DM intake (average 9 kg/day) was restricted to a maximum of 0p"90 of ad libitum intake. Ruminal pH (range of 6p"7-6p"5) linearly (P<0p"003) and quadratically (P<0p"005) decreased, and total volatile fatty acid (VFA) concentration (range of 64p"4-67p"1 mm) tended (P<0p"087) to increase linearly with rising calcium propionate supplementation. Ratio of acetate to propionate fell linearly (P<0p"006) and quadratically (P<0p"008) from 3p"5 to 2p"6 as calcium propionate supplementation increased due to the additional propionate supplementation. In situ ruminal neutral detergent fibre (NDF) degradation of maize stover and crude protein (CP) degradability of concentrate mix were improved with increasing concentration of calcium propionate. Urinary excretion of PD was linearly (P<0p"032) and quadratically (P<0p"048) increased with greater calcium propionate supplementation (72, 74, 77 and 76 mmol/day for control, LCaP, MCaP and HCaP, respectively). Similarly, digestibilities of organic matter (OM), NDF and CP in the total tract were also linearly and quadratically improved with increasing calcium propionate. The results indicate that the calcium propionate supplementation potentially improves rumen fermentation and feed digestion in beef cattle. It is speculated that calcium propionate stimulates the digestive microorganisms or enzymes in a dose-dependent manner. In the experimental conditions of the current trial, the optimum calcium propionate dose was about 200 g calcium propionate per steer per day.
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