摘要
The objective of this study was to determine the effect of a monensin controlled-release capsule administered intraruminally at dry-off on rumen volatile fatty acids, NH3, lactate, pH, and energy blood metabolites in transition dairy cows fed Florida typical diets. In March 2003, 24 cows (10 primiparous and 14 multiparous) dried-off 50 to 70 d before expected parturition were randomly assigned to a treatment (n = 12, oral capsule of monensin) or a control group (n = 12, no capsule). Both groups received the same diet and were exposed to the same environment and management conditions. At assignment, at 21 d before expected parturition, at calving, and at 7, 14, and 21 d postpartum, blood samples were taken and body condition scores were determined. At 10 d postpartum, rumen and blood samples were obtained in the morning before the first feeding and at 2, 4, and 6 h after feeding. Serum nonesterified fatty acids (NEFA), β-hydroxybutyrate (BHBA), and glucose were measured. Rumen samples were analyzed for concentrations of acetic, propionic, butyric, l- and d-lactic acids, and NH3. Data for rumen and blood metabolites were analyzed by ANOVA, mixed models for repeated measures. Volatile fatty acids were not different between groups. Multiparous treated cows had a significant reduction in rumen NH3 at 6 h after feeding. Treatment with monensin significantly increased body condition score at calving in multiparous cows. During the postpartum period, NEFA and BHBA were noticeably lower in treated than in control primiparous cows. This difference was not observed in multiparous cows.
摘要译文
本研究的目的是确定在干燥的瘤胃内施用莫能菌素控释胶囊对瘤胃挥发性脂肪酸，NH 3，乳酸盐，pH，以及喂养佛罗里达州典型饮食的转型奶牛的能量血液代谢物。 2003年3月，在预期分娩前50至70天干燥的24头母牛（10头初产母猪和14头经产母猪）被随机分配到一个治疗组（n \x3d 12，莫能菌素口服胶囊）或对照组（n \x3d 12，无胶囊）。两组都接受相同的饮食，并且暴露于相同的环境和管理条件下。在分娩前21天，分娩前，产犊时和7,14天，和产后21天，采集血液样本并测定身体状况评分。在产后10天，在第一次喂食之前的早晨以及在2,4和5天时获得了瘤胃和血液样品。喂食后6小时。测量血清非酯化脂肪酸（NEFA），β-羟基丁酸酯（BHBA）和葡萄糖。分析瘤胃样品的乙酸，丙酸，丁酸，l-和d-乳酸和NH 3。通过ANOVA分析瘤胃和血液代谢物的数据，用于重复测量的混合模型。挥发性脂肪酸在组间没有差异。饲喂6小时后，多次处理的奶牛瘤胃NH 3显着降低。经莫能菌素治疗显着提高了经产奶牛产犊时的体况评分。在产后期间，NEFA和BHBA治疗组明显低于对照初产母牛。在经产奶牛中没有观察到这种差异。
P.Melendez[1];J.P.Goff[2];C.A.Risco[1];L.F.Archbald[1];R.Littell[3];G.A.Donovan[1];. Effect of a Monensin Controlled-Release Capsule on Rumen and Blood Metabolites in Florida Holstein Transition Cows*[J]. Journal of Dairy Science, 2004,87(12): 4182-4189