Effects of prepartum administration of a monensin controlled release capsule on rumen pH, feed intake, and milk production of transition dairy cows
Effects of prepartum administration of a monensin controlled release capsule on rumen pH, feed intake, and milk production of transition dairy cows
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DOI：
10.3168/jds.s0022-0302(07)71577-1
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发表时间：
2007-02-01
影响因子：
3.5
通讯作者：
McBride, B. W.
中科院分区：
文献类型：
--
作者：
Fairfield, A. M.;Plaizier, J. C.;McBride, B. W.
在16头经产荷斯坦奶牛的过渡期和泌乳早期，测定了瘤胃施用莫能菌素控释胶囊（CRC）对瘤胃pH值、干物质采食量和产奶量的影响。根据产犊日期将奶牛分为2个区组。奶牛自由采食近距离干奶牛或泌乳奶牛全混合日粮。使用留置探针连续监测瘤胃pH值。在整个实验中，莫能菌素不影响平均每日瘤胃pH、低于pH 6的时间、低于pH 5.6的时间、低于pH 6的面积和低于pH 5.6的面积。产犊前平均每日pH值、低于pH 6的时间和低于pH 5.6的时间分别为6.62、65.6 min/d和17.6 min/d，产犊前几周之间无差异。产犊后第1周内，日平均pH值、pH值低于6的时间和pH值低于5.6的时间分别为6.19、443.3 min/d和115.5 min/d;第6周内，日平均pH值、pH值低于6的时间和pH值低于5.6的时间分别为6.36、204.3 min/d和52.4 min/d。在产犊后的几周内，平均每日pH值呈二次增加，低于pH 6的时间呈二次减少，低于pH 5.6的时间呈线性减少。莫能菌素不影响干物质摄入量和每日产奶量、乳脂和乳蛋白。结果表明，在过渡期和泌乳早期，莫能菌素CRC的瘤胃给药不会增加饲喂实验日粮的经产奶牛的瘤胃pH值。
Effects of prepartum administration of a monensin controlled release capsule ( CRC) on rumen pH, dry matter intake, and milk production during the transition period and early lactation were determined in 16 multiparous Holstein cows. Cows were divided into blocks of 2 depending on calving date. Cows were fed either a close-up dry cow or a lactating cow total mixed ration ad libitum. Rumen pH was monitored continuously using indwelling probes. Monensin did not affect average daily rumen pH, time below pH 6, time below pH 5.6, area below pH 6, and area below pH 5.6 throughout the experiment. Average daily pH, time below pH 6, and time below pH 5.6 before calving were 6.62, 65.6 min/d, and 17.6 min/d, respectively, and did not differ among the weeks before calving. Average daily pH, time below pH 6, and time below pH 5.6 were 6.19, 443.3 min/d, and 115.5 min/d,respectively, during the first week after calving, and were 6.36, 204.3 min/d, and 52.4 min/d, respectively, during the sixth week after calving. In the weeks after calving, average daily pH showed a quadratic increase, time below pH 6 showed a quadratic decrease, and time below pH 5.6 showed a linear decrease. Monensin did not affect dry matter intake and daily yields of milk, milk fat, and milk protein. Results suggest that prepartum administration of a monensin CRC did not increase rumen pH in multiparous cows fed the experimental diets during the transition period and early lactation.