Relationship of severity of subacute ruminal acidosis to rumen fermentation, chewing activities, sorting behavior, and milk production in lactating dairy cows fed a high-grain diet
Relationship of severity of subacute ruminal acidosis to rumen fermentation, chewing activities, sorting behavior, and milk production in lactating dairy cows fed a high-grain diet
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DOI：
10.3168/jds.2013-7472
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发表时间：
2014-05-01
影响因子：
3.5
通讯作者：
Oba, M.
中科院分区：
文献类型：
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作者：
Gao, X.;Oba, M.
本研究的目的是评估饲喂高谷物饲料的哺乳期奶牛亚急性瘤胃酸中毒(SARA)严重程度的变化，并确定耐受高谷物饲料的动物的特征因素。试验选用16头哺乳末期奶牛(产奶天数=282+/-33.8；体重=601+/-75.9 kg)，饲喂含35%粗饲料和65%精料的高粮日粮。在17d的饮食适应后，监测24小时的咀嚼活动，并每30 S测量一次瘤胃pH，持续72小时。酸中毒指数，定义为SARA(pH区)的严重程度
The objectives of the current study were to evaluate the variation in severity of subacute ruminal acidosis (SARA) among lactating dairy cows fed a high-grain diet and to determine factors characterizing animals that are tolerant to high-grain diets. Sixteen ruminally cannulated late-lactating dairy cows (days in milk = 282 +/- 33.8; body weight = 601 +/- 75.9 kg) were fed a high-grain diet consisting of 35% forage and 65% concentrate mix. After 17 d of diet adaptation, chewing activities were monitored for a 24-h period and ruminal pH was measured every 30 s for 72 h. Acidosis index, defined as the severity of SARA (area of pH