Temporal associations between low body condition, lameness and milk yield in a UK dairy herd
Temporal associations between low body condition, lameness and milk yield in a UK dairy herd
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DOI：
10.1016/j.prevetmed.2013.10.009
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发表时间：
2014-01-01
影响因子：
2.6
通讯作者：
Green, M. J.
中科院分区：
文献类型：
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作者：
Green, L. E.;Huxley, J. N.;Green, M. J.
以前的研究假设，牛在低身体状况成为跛脚。我们在一项前瞻性纵向研究中对此进行了测试。在44个月内从600头奶牛群中收集身体状况评分（BCS）、跛行原因和产奶量。采用混合效应二项模型和连续结果模型研究跛行、BCS和产奶量之间的关系。总共从1137头奶牛中获得了14，320个风险期。共有1510例跛行治疗：最常见的跛行原因是足底溃疡（SU）（39%）、足底出血（SH）（13%）、趾皮炎（DD）（10%）和白色线病（WLD）（8%）。这些数字因年和季度而异。每隔60天对身体状况进行评分。BCS的范围为1 - 5，平均值为2.5，评分在哺乳早期较高，但在整个哺乳期变化很大;约45%的评分< 2.5。关键发现是BCS < 2.5 was associated with an increased risk of treatment for lameness in the following 0-2 months and >2-4个月用于所有跛行原因，特别是SU/WLD跛行。BCS < 2.5 was associated with an increased risk of treatment for SH in the following 0-2 months but not >2-4个月。与DD没有这种关联。所有跛行、SU/WLD、SH和DD在既往跛行的奶牛中发生的可能性显著更高，但即使从分析中排除所有重复跛行病例，BCS的影响也存在。与非跛行奶牛相比，SU/WLD跛行奶牛的产奶量显著更高，并在给药前一个月下降，但DD治疗奶牛的产奶量并不显著更高。这些发现支持了这一假设，即低BCS有助于发展角相关的爪跛行，但不是传染性爪疾病的奶牛。低BCS和跛行之间的一个联系是一个薄的数字垫已被提出作为一个触发器的爪角疾病。BCS 2的奶牛比BCS 2.5的奶牛产奶量更多，但是，在305天的泌乳期内，产量仅相差约100 kg。考虑到BCS 2的奶牛跛行风险增加，跛行的直接成本和BCS产奶量的小变异性，防止奶牛降至BCS < 2.5将改善奶牛福利并具有经济效益。(C)2013爱思唯尔有限公司版权所有。
Previous work has hypothesised that cows in low body condition become lame. We tested this in a prospective longitudinal study. Body condition score (BCS), causes of lameness and milk yield were collected from a 600-cow herd over 44-months. Mixed effect binomial models and a continuous outcome model were used to investigate the associations between lameness, BCS and milk yield. In total, 14,320 risk periods were obtained from 1137 cows. There were 1510 lameness treatments: the most common causes of lameness were sole ulcer (SU) (39%), sole haemorrhage (SH) (13%), digital dermatitis (DD) (10%) and white line disease (WLD) (8%). These varied by year and year quarter. Body condition was scored at 60-day intervals. BCS ranged from 1 to 5 with a mean of 2.5, scores were higher in very early lactation but varied widely throughout lactation; approximately 45% of scores were < 2.5. The key finding was that BCS < 2.5 was associated with an increased risk of treatment for lameness in the following 0-2 months and > 2-4 months for all causes of lameness and also specifically for SU/WLD lameness. BCS < 2.5 was associated with an increased risk of treatment for SH in the following 0-2 months but not > 2-4 months. There was no such association with DD. All lameness, SU/WLD, SH and DD were significantly more likely to occur in cows that had been lame previously, but the effect of BCS was present even when all repeat cases of lameness were excluded from the analysis. Milk yield was significantly higher and fell in the month before treatment in cows lame with SU/WLD but it was not significantly higher for cows that were treated for DD compared with non-lame cows. These findings support the hypothesis that low BCS contributes to the development of horn related claw lameness but not infectious claw diseases in dairy cows. One link between low BCS and lameness is a thin digital cushion which has been proposed as a trigger for claw horn disease. Cows with BCS 2 produced more milk than cows with BCS 2.5, however, this was only approximately 100 kg difference in yield over a 305-day lactation. Given the increased risk of lameness in cows with BCS 2, the direct costs of lameness and the small variability in milk yield by BCS, preventing cows from falling to BCS < 2.5 would improve cow welfare and be economically beneficial. (C) 2013 Elsevier B.V. All rights reserved.