【摘要】 为了探究过瘤胃蛋氨酸(Rumen-protected methionine, RPM)对泌乳高峰期奶牛生产性能和全肠道消化率的影响，试验选取16头处于泌乳高峰期，体重、生理状况相似的健康荷斯坦奶牛，随机分为2组。对照组每日饲喂基础TMR日粮，RPM组每头牛在基础日粮的基础上，每日单独补饲15 g RPM。结果表明：(1)泌乳高峰期奶牛日粮中添加RPM不影响体重、体况评分和干物质采食量(DMI)(P>0.05);(2)添加RPM对奶牛的产奶量和乳成分影响不显著(P>0.05);(3)添加RPM有降低瘤胃丁酸含量的趋势(P=0.069);(4)添加RPM不影响奶牛的表观消化率(P>0.05);(5)RPM显著提高了奶牛血浆尿素氮和二氧化碳水平(P<0.05);(6)RPM对血液中蛋氨酸的含量没有影响，脯氨酸浓度显著降低(P<0.05),具有降低血浆精氨酸和天冬氨酸含量的趋势(0.05<P<0.10)。总体而言，泌乳高峰期奶牛补饲RPM可能通过提高蛋氨酸吸收率、氨基酸代谢和机体蛋白合成改善泌乳高峰期奶牛健康状况。更多还原

【Abstract】 In order to investigate the effects of Rumen-protected methionine(RPM) on performance and total intestinal digestibility of dairy cows at peak lactation, 16 healthy Holstein dairy cows at peak lactation with similar body weight and physiological conditions were randomly divided into two groups. The control group was fed a basal TMR diet daily, and each cow in the RPM group was fed 15 g RPM alone daily in addition to the basal diet. The results showed that:(1) RPM supplementation did not affect body weight, body condition score and dry matter intake(DMI)(P>0.05);(2) There was no significant effect of RPM on milk yield and milk composition(P>0.05);(3) RPM tended to reduce the content of rumen butyric acid(P=0.069).(4) RPM did not affect apparent digestibility(P>0.05);(5) RPM significantly increased the levels of plasma urea nitrogen and carbon dioxide(P>0.05);(6) RPM had no effect on the content of methionine in blood, but the concentration of proline was significantly decreased(P<0.05), and RPM tended to decrease plasma arginine and aspartic acid levels(0.05<P<0.10). In general, RPM supplementation may improve the health status of dairy cows at peak lactation period by improving methionine digestibility, amino acid metabolism and body protein synthesis.更多还原