动物营养学报2017，Vol.29Issue(7)：2556-2564,9.DOI:10.3969/j.issn.1006-267x.2017.07.041
不同精粗比饲粮中添加甘露寡糖对绵羊瘤胃养分降解率的影响
Effects of Adding Mannan-Oligosaccharides to Diets with Different Concentrate to Roughage Ratios on Nutrient Degradation Rates in Sheep Rumen
摘要
Abstract
The purpose of this experiment was to investigate the effects of adding mannan-oligosaccharides (MOS) to diets with different concentrate to roughage ratios on nutrient degradation rates in sheep rumen using nylon bag technique.Six wethers (white Suffolk ×small-tailed Han sheep ♀) installed permanent rumen fistula were used for offering ruminal digestible situation.A 4×6 two-factor design was adopted and two factors were the ratio of concentrate to roughage [A1 (20∶80), A2 (30∶70), A3 (40∶60) and A4 (50∶50), respectively] and the adding level of MOS [B1 (0%), B2 (0.4%), B3 (0.8%), B4 (1.2%), B5 (1.6%) and B6 (2.0%), respectively].The results showed that the rumen degradation rates, degradation parameters [DM and OM: immediately degraded fraction (a), slowly degraded fraction (b) and degradable fraction (a+b);CP: a, b and the rate degradation of b (c)] and effective degradation rates of dry matter (DM), organic matter (OM) and crude protein (CP) at different time points were significantly influenced by the dietary concentrate to roughage ratio (P<0.05), and they were promoted with the dietary concentrate to roughage ratio increasing.These indexes of A4 group reached the peak at all time points.The rumen degradation rate and a+b of digestible parameters of CP were significantly influenced by the MOS adding level (P<0.05), which were firstly increased and then decreased with the MOS adding level rising, and the highest values were found in B5 group.There were no significant interaction in nutrient degradation rates between dietary concentrate to roughage ratio and MOS adding level (P>0.05).In conclusion, when dietary concentrate to roughage ratio is 50∶50, the effective degradation rates of DM, OM and CP in sheep rumen have the highest values;when MOS adding level is 1.6%, the degradation rate of CP in sheep rumen has the highest value.关键词
绵羊/精粗比/甘露寡糖/尼龙袋法/瘤胃降解率Key words
sheep/concentrate to roughage ratio/mannan oligosaccharides/nylon bag technique/rumen degradation rate分类
农业科技引用本文复制引用
王林,赵臣,曾燕霞,陈志龙,郑琛..不同精粗比饲粮中添加甘露寡糖对绵羊瘤胃养分降解率的影响[J].动物营养学报,2017,29(7):2556-2564,9.基金项目
国家自然科学基金项目(31560646) （31560646）
