The influence of long-term supplementation with biotin on the prevention of lameness in pasture fed dairy cows
The influence of long-term supplementation with biotin on the prevention of lameness in pasture fed dairy cows
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DOI：
10.3168/jds.s0022-0302(00)74884-3
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发表时间：
2000-02-01
影响因子：
3.5
通讯作者：
Svendsen, OL
中科院分区：
文献类型：
--
作者：
Fitzgerald, T;Norton, BW;Svendsen, OL
在一项双盲研究中，对补充生物素对奶牛跛行的影响进行了 13 个月的调查。实验地点位于热带高地环境，涉及 20 个参与农场的 2705 头荷斯坦奶牛和弗里斯兰奶牛。 10 个农场的奶牛每天以 20 毫克/头的比例接受浓缩物中的生物素，其他 10 个农场的奶牛则接受不添加生物素的饲料。将含有或不含生物素的预混料掺入谷物浓缩物中，在挤奶时以恒定的比例喂给奶牛。农民对蹄问题的性质和所采用的治疗方法进行了准确记录。每隔 8 周对每个牛群的运动评分进行评估。运动得分与每月可测量降雨量的天数显着相关（r = 0.88）。补充生物素的牛群比未补充生物素的牛群表现出更好的运动得分。据农民观察，在潮湿的夏季，补充生物素的牛群在雨季期间跛行的奶牛数量显着减少，并且比未补充生物素的牛群需要更少的抗生素治疗。大多数蹄部病变最常见于后肢的外爪。每日产奶量（17.3 升与 18.5 升）不受生物素补充的影响。在潮湿的夏季，添加生物素的牛群记录到散装牛奶的乳脂百分比和体细胞计数降低。
In a double-blind study, the influence of biotin supplementation on lameness in dairy cows was investigated over a 13-mo period. The experimental site was a tropical upland environment and involved over 2705 Holstein and Friesian cows on 20 participating farms. Cows on 10 farms received biotin at a rate of 20 mg/head per day in the concentrate, and cows on 10 other farms received feed without the biotin supplement. Premixes with or without biotin were incorporated into a grain concentrate that was fed at a constant rate to cows at milking. Farmers maintained accurate records of the nature of hoof problems and any treatment applied.Each herd was evaluated for locomotion scores at 8-wk intervals. Locomotion scores were significantly correlated with the number of days with measurable rainfall per month (r = 0.88). The biotin-supplemented herds exhibited better locomotion scores than the unsupplemented herds. In the wet summer period the number of lame cows, as observed by the farmer, were significantly fewer during the rainy period for the biotin-supplemented herds and required fewer antibiotic treatments than unsupplemented herds. Most hoof lesions were most commonly observed in the outer claws of the hind limb.Daily milk production (17.3 vs. 18.5 L) was not affected by biotin supplementation. Reduced milk fat percentage and somatic cell counts of bulk milk were recorded in the biotin supplemented herds during the wet, summer period.