瘤胃保护性赖氨酸和蛋氨酸对小尾寒羊瘤胃发酵及粗饲料成分瘤胃降解率的影响

Effects of Rumen Protected Lysine and Methionine on Ruminal Fermentation and Roughage Degradability of Small-tail Han Sheep

旨在研究瘤胃保护性赖氨酸和蛋氨酸添加水平及其配比对小尾寒羊瘤胃发酵及粗饲料成分瘤胃降解率的影响。选用装有永久性瘤胃瘘管、体重(45±2.6)kg的小尾寒羊10只,按完全随机原则进行3阶段试验,每阶段预饲期12 d,正试期3 d。对照组饲喂基础日粮,试验组分别在基础日粮中添加不同水平及配比的保护性赖氨酸和蛋氨酸。结果表明:保护性氨基酸添加水平及其配比对瘤胃液p H值、NH3-N浓度、VFA含量及其比例无明显影响(P>0.05),但可不同程度提高菌体蛋白含量,其中I组极显著高于对照组(P<0.01);添加适当水平的保护性氨基酸,可明显提高DM、ADF的瘤胃降解率(P<0.05),而对CF、NDF瘤胃降解率无显著影响(P>0.05)。本试验条件下,每只小尾寒羊日粮中保护性赖氨酸及蛋氨酸的添加量分别以8.4,2.4 g/d为宜。

This experiment was conducted to study effects of rumen protected Lysine and Methionine supplements on ruminant fermentation and roughages degradability of small-tail han sheep. A total of 10 small-tail han sheep（ （45 ± 2.6） kg of body weight） with permanent rumen eannula were selected for the study. The study was conducted in three replicates,each of which lasted for 15 days（ 12 days of pre-testing period and 3 days of formal test period）. Different supplements of protected lysine and methionine were added into basal diet. Protected amino acids supplements had no effects on rumen pH, NH3-N concentration and VFA concentration （P 〉 0.05）. Compared to control group,mycoprotein content in group I was higher（P 〈 0.01 ）. Appropriate protected amino acids supplements could significantly improve the DM,ADF rumen degradation rate（P 〈 0.05 ） but not the CF, NDF ruminal degradation rates（P 〉0.05）. It could be concluded from results that the appropriate supplement of protected Lysine and Methionine was 8.4,2.4 g/d per sheep under the experimental conditions,respectively.