Bergsten C, Greenough P R, Gay J M, Seymour W M, Gay C C
Department of Animal Environment and Health, Swedish University of Agriculture (SLU) S-532 23 Skara, Sweden.
J Dairy Sci. 2003 Dec;86(12):3953-62. doi: 10.3168/jds.S0022-0302(03)74005-3.
A controlled 14-mo field trial was conducted to evaluate the effect of biotin supplementation on hoof lesions, milk production, and reproductive performance in a commercial dairy herd. One hundred seventy cows were studied and supplemented with either 0 or 20 mg/d of biotin by computer feeder. All were housed in the same free-stall facility with the same environment, base diet, and management. The feet of 99 cows were trimmed three times at 6-mo intervals, and hoof health was evaluated. Milk production and fertility data were captured monthly by the Dairy Herd Improvement Association. At the final hoof trimming, sole hemorrhages were significantly higher in control (50%) vs. biotin-supplemented animals (24%). The incidents of cows affected with double soles, hoof wall grooves, and heel horn erosion did not differ between control and biotin-supplemented animals. Biotin supplementation of trimmed cows resulted in 878 kg more milk than control cows when compared with previous lactation yield (n = 46 biotin supplemented, n = 48 control cows). At the end of the study, for both trimmed and untrimmed animals, biotin supplemented cows (n = 81) produced 481 kg more milk and 25 kg more fat than the controls (n = 81). There was no interaction between biotin supplementation and hoof trimming on milk production. There were variations in the response of fertility to biotin between age groups. First lactation heifers fed supplemental biotin had significantly fewer days from calving to conception and required fewer inseminations per pregnancy than controls of the same parity.
进行了一项为期14个月的对照田间试验，以评估在一个商业奶牛群中补充生物素对蹄部病变、产奶量和繁殖性能的影响。研究了170头奶牛，通过计算机喂食器分别补充0或20毫克/天的生物素。所有奶牛都饲养在相同的自由牛舍设施中，环境、基础日粮和管理方式相同。对99头奶牛的蹄子每隔6个月修剪三次，并评估蹄部健康状况。奶牛改良协会每月收集产奶量和繁殖力数据。在最后一次蹄部修剪时，对照组（50%）的蹄底出血明显高于补充生物素的动物（24%）。对照组和补充生物素的动物在双蹄底、蹄壁凹槽和蹄跟角质侵蚀方面的发生率没有差异。与前一个泌乳期产量相比，补充生物素的修剪奶牛比对照奶牛多产奶878千克（补充生物素的奶牛46头，对照奶牛48头）。在研究结束时，对于修剪和未修剪的动物，补充生物素的奶牛（81头）比对照组（81头）多产奶481千克，多产脂肪25千克。补充生物素和蹄部修剪对产奶量没有交互作用。不同年龄组对生物素的繁殖力反应存在差异。与相同胎次的对照组相比，补充生物素的头胎青年母牛从产犊到受孕的天数明显减少，每次怀孕所需的输精次数也更少。
