摘要
选用4只装有永久性瘤胃瘘管的杂交一代(小尾寒羊×无角陶赛特)羯羊(平均体重45.0kg),采用4×4拉丁方设计,研究日粮精料水平对绵羊瘤胃内容物中亚油酸及其氢化产物组成的影响。在日粮中添加大豆油,调整粗脂肪和亚油酸含量分别至(7.3±0.1)%和(25.4±0.9)mg/g(干物质基础),日粮精料水平分别为30.2,39.3,48.8和57.7%(干物质基础)。试验结果表明,57.7%精料日粮组瘤胃内容物中亚油酸的含量(mg/gDM)及其在总18C脂肪酸中的比例最高(P<0.01),反11C18∶1、顺9,反11CLA的含量及二者在总18C脂肪酸中的比例最低(P<0.01);各组瘤胃内容物中C18∶0的含量及其在总18C脂肪酸中的比例没有显著差异(P>0.05)。瘤胃内容物中亚油酸、顺9,反11CLA和反11C18∶1的含量与日粮NDF水平呈极显著线性相关(P<0.01)。亚油酸的氢化效率随日粮精料水平的提高而显著降低(P<0.05)。
Four wethers (Small Tail Han sheep×Poll Dorset,45.0 kg) with permanent rumen fistula were used in Latin-square design to determine the effects of dietary concentrate levels on linoleic acid and its hydrogenation products in ruminal contents in sheep. Dietary crude fat and linoleic acid were adjusted to (7.35±0.1) % and (25.5±0.9) (mg/g) (DM basis) respectively by supplementing soybean oil. The concentrate levels of diets were 30.2, 39.3, 48.8 and (57.7%) (DM basis), respectively. The concentrations (mg/g DM) in ruminal contents and proportions (%) in total 18-C fatty acids of C18∶2^(cis-9,12) were highest (P<0.01), but those of C18∶1^(trans-11) and cis9,trans11-CLA were lowest ((P<0.01)) on the 57.7% concentrate diet, and those of C18∶0 were not different (P>0.05) among four groups. The concentrations of C18∶1^(trans-11), cis9,trans11-CLA and C18∶2^(cis-9,12) in ruminal contents were correlated linearly (P<(0.01)) with dietary NDF levels. The ruminal biohydrogenation (%) of C18∶2^(cis-9,12) decreased with increasing dietary concentrate (P<0.05).
出处
《中国畜牧杂志》
CAS
北大核心
2005年第5期6-9,共4页
Chinese Journal of Animal Science
基金
国家"863"课题(2002AA241181)
关键词
畜牧学
精料水平
亚油酸及其氢化产物
瘤胃
绵羊
animal science
concentrate levels
linoleic acid and its hydrogenation products
rumen
sheep
