绵羊对可酶解和不可酶解纤维素、半纤维素消化率的研究

The Digestibility of the Enzyme-hydrolysable and Non-enzyme-hydrolysable Cellulose and Hemicellulose by Sheep

在3个独立的试验中共测定了34羊次成年小尾寒羊母羊采食玉米秸秆日粮时可酶解和不可酶解纤维素、半纤维素的消化率。测得的可酶解纤维素、不可酶解纤维素、可酶解半纤维素和不可酶解半纤维素的平均消化率(96.06%±2.91%,2.32%±9.31%,96.72%±2.78%和2.14%±7.38%),从而表明将粗饲料中的纤维素、半纤维素分为可酶解和不可酶解两部分,是有生物学意义的。本研究发现,绵羊个体之间对粗饲料纤维素、半纤维素消化率的差异性,主要是由于其对不可酶解部分消化率的不同造成的。本研究表明,对于反刍动物纤维素类物质消化的研究,重点应是不可酶解部分的消化。

Digestibility of the enzyme-hydrolyasable （EH）, non-enzyme-hydrolyasable （NEH） cellulose and hemicellulose in 34 adult Small Tail Han ewes, fed with the diets containing maize stalk, were determined in 3 independent experiments. The results showed that the assayed average digestibility of EH cellulose, NEH cellulose, EH hemicellulose and NEH hemicellulose were 96.06 % ± 2.91%, 2.32 % ± 9.31%, 96.72 %±2.78 % and 2.14 % ± 7.38 % respectively. It is showed that the classification of the cellulose and hemicellulose in roughage into enzyme-hydrolyasable and non- enzyme-hydrolyasable is biologically significant. This study found that there was different digestibility of the cellulose and hemicellulose of roughage between individual sheep mainly because of the difference of digestibility on NEH part by the animal, and therefore it is suggested that the interest in the digestion of fiber material by ruminants should be focused on the digestion of NEH part.