摘要
将16只30日龄体重约6～10 kg装有瘤胃瘘管的罗姆尼与新疆美利奴羊杂交公羔分为4组,分别喂以不同消化能(DE,MJ/kg)和蛋白质(CP,%)水平的日粮(DE/CP:11.91/20、11.91/14、8.15/20和8.15/14),以15 d为一研究时间段,每时间段的第9、10和11天在第一次喂料后的第0、1、3、6和9 h采取瘤胃液样品,以研究30～150日龄期间羔羊瘤胃消化代谢的变化规律.结果表明,羔羊瘤胃液pH、氨态氮、丙酸、乙+丙+丁酸浓度随日龄而不断升高,在100日龄时趋于稳定,并且受日粮营养水平的影响.乙酸浓度的变化虽也受日龄和日粮营养水平的影响,但相对较小.羔羊瘤胃液体积在120日内几乎增加了15倍,并且也受日粮营养水平的影响.研究表明瘤胃消化代谢的发育是渐进性的,在100日龄时各项指标均趋于稳定,并且瘤胃液体积的增大对于瘤胃消化代谢能力的发育起着首要的作用.
16 of 30 days＇ Romney Marsh×Xinjiang Merino male lambs,at the body weight of 6-10 kg, with rumen fistula, were divided into 4 groups, and were fed 4 diets with DE/CP（MJ/%） of 11.91/20, 11.91/14,8.15/20 and 8.15/14 respectively,to study the development of the digestion and metabolism in rumen. At the last 3 days of every 15 days,the rumen fluid were sampled at 0,1,3,6 and 9 hours after feeding during the age of 30-150 days for assaying. The results showed that the pH, NH3-N, propionic acid,and acetic＋ propionic＋ butyric acids concentrations in rumen fluid were affected by dietary nutrient level,increased with the age, and were stable after 100 days＇ age. The effect of age and dietary nutrient level on acetic acid in rumen fluid was less. The rumen fluid volume was increased almost by 15 times in 120 days,as well was related with nutrient level of diet. This study elites that the development of the digestion and metabolism of rumen is progressive, which is mainly dependent on the increase of rumen fluid volume,and at 100 days age it presents a stable tendency.
出处
《畜牧兽医学报》
CAS
CSCD
北大核心
2005年第11期1145-1149,共5页
ACTA VETERINARIA ET ZOOTECHNICA SINICA
基金
国家自然科学基金资助项目(30360076)
关键词
羔羊
日粮
瘤胃
消化
发育
lamb
diet
rumen
digestion
development
