Melendez Pedro, Goff Jesse P, Risco Carlos A, Archbald Louis F, Littell Ramon C, Donovan G Arthur
Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, 32610-0136, USA.
Am J Vet Res. 2006 Mar;67(3):537-43. doi: 10.2460/ajvr.67.3.537.
To determine the effect of a controlled-release monensin capsule administered at cessation of lactation on incidence of calving-related disorders, fertility, and milk yield in dairy cows.
290 dairy cows treated with monensin and 290 untreated control cows.
Treated cows received a capsule that released monensin at 335 mg/d for 95 days. Incidence of calving-related disorders; daily milk yield up to 20 days postpartum; test-day milk yield, fat, protein, and mature-equivalent 305-day milk production; and body condition score at calving were determined. Reproductive variables were conception rate at first service, pregnancy rate, and calving-to-conception interval.
Cows treated with monensin were 2.1 times as likely to develop dystocia and 0.8 times as likely to develop metritis as control cows. For milk yield, there was an interaction of treatment X time X parity. In multiparous cows, monensin significantly improved milk yield at test days 4 and 7. In addition, monensin increased body condition score at calving.
Despite increasing the likelihood of developing dystocia and metritis, administration of monensin improved the lactational performance of multiparous cows and may be a promising additive for use at the time of cessation of lactation.
确定在泌乳期结束时给予控释莫能菌素胶囊对奶牛产犊相关疾病发病率、繁殖力和产奶量的影响。
290头接受莫能菌素治疗的奶牛和290头未治疗的对照奶牛。
治疗组奶牛接受一粒胶囊，该胶囊以每天335毫克的剂量释放莫能菌素，持续95天。测定产犊相关疾病的发病率；产后20天内的每日产奶量；测定日的产奶量、脂肪、蛋白质和相当于成熟奶牛305天的产奶量；以及产犊时的体况评分。繁殖变量包括首次配种时的受孕率、妊娠率和产犊至受孕间隔。
接受莫能菌素治疗的奶牛发生难产的可能性是对照奶牛的2.1倍，发生子宫炎的可能性是对照奶牛的0.8倍。对于产奶量，存在处理×时间×胎次的交互作用。在经产奶牛中，莫能菌素显著提高了第4天和第7天测定日的产奶量。此外，莫能菌素提高了产犊时的体况评分。
尽管莫能菌素增加了发生难产和子宫炎的可能性，但它改善了经产奶牛的泌乳性能，可能是泌乳期结束时一种有前景的添加剂。
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