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首页> 外文期刊>Preventive Veterinary Medicine >Investigation of dairy cow performance in different udder health groups defined based on a combination of somatic cell count and differential somatic cell count
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Investigation of dairy cow performance in different udder health groups defined based on a combination of somatic cell count and differential somatic cell count

机译：基于体细胞计数和差分体细胞计数的组合定义的不同乳房健康群中乳制品母牛表现的调查

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摘要

Mastitis is still the costliest disease in milk production. In particular, its subclinical form, which may spread unnoticeably within a herd, is a major challenge. Somatic cell count (SCC) is broadly used as an indicator for mastitis and thus the basis for udder health management programmes, e.g. through dairy herd improvement (DHI) testing. Since recently, differential somatic cell count (DSCC, representing the combined proportion of polymorphonuclear neutrophils and lymphocytes as a percentage of total SCC) is available in addition. Our study was aimed to investigate dairy cow performance in four newly defined udder health groups (UHG) based on SCC and DSCC results from DHI testing. In total, 961,835 test-day results generated in Austria, China, Estonia, Germany, and Spain between January 2019 and March 2020 were available for data analyses. Cows were categorised into four UHG depending on test day SCC and DSCC results (UHG A: healthy/normal, <= 200,000 cells/mL and <65 %; B: suspicious, <= 200,000 cells/mL and >65 %; C: mastitis, >200,000 cells/mL and >65 %; D: chronic/persistent mastitis, >200,000 cells/mL and <= 65 %). Linear mixed effect models were used to compare the performance of cows between the UHG based on the parameters milk weight, energy-corrected milk, fat, protein, lactose, and estimated milk value. Highest performance was found for cows in UHG A and ranged between 21.4 (Austria) and 38.3 kg per cow and day (Spain). Interestingly, cows in group B were significantly less productive (0.9-2.4% less daily milk production) compared to those in group A. Cows in groups C (6.0-9.8% less daily production compared to group A) and D were, as expected, even less productive with a particularly significant drop for cows in group D (17.5-38.5% less daily production). These trends could be observed in all countries involved in this study. Proportions of cows in the four different UHG differed between countries, changed slightly within countries depending on season, differed depending on parity and days in milk, and were seen to vary hugely between herds. In conclusion, this study demonstrates changes in performance of dairy cows depending on their udder health status as defined based on the combination of SCC and DSCC. In particular cows in UHG B and D are of interest as they cannot be identified working with SCC only. Nevertheless, the actual udder health management measures that could be taken based on the new UHG still require further investigation.
机译：乳腺炎仍然是牛奶生产中最昂贵的疾病。特别是，它的亚临床形式可能在牛群中蔓延，是一项重大挑战。体细胞计数（SCC）广泛用作乳腺炎的指标，因此是乳腺健康管理计划的基础，例如乳房健康管理计划的基础。通过乳制品改善（DHI）测试。此外，除此之外，还提供差异体细胞计数（DSCC，代表多核嗜中性粒细胞和淋巴细胞的组合比例，作为总SCC的百分比）。我们的研究旨在根据SCC和DSCC从DHI测试中的四个新定义的乳房健康群体（UHG）调查乳品母牛表现。在2019年1月至2020年1月在2019年1月至2020年间在奥地利，中国，爱沙尼亚，德国和西班牙产生的961,835个测试日结果可用于数据分析。根据测试日和DSCC结果（UHG A：健康/正常，<= 200,000个细胞/ mL和<65％; B：可疑，<= 200,000个细胞/ ml和> 65％; C：乳腺炎，> 200,000个细胞/ ml和> 65％; D：慢性/持续乳腺炎，> 200,000个细胞/ ml和<= 65％）。线性混合效果模型用于基于参数牛奶重量，能量矫正牛奶，脂肪，蛋白质，乳糖和估计的牛奶价值比较UHG之间的母牛的性能。 UHG A的母牛的母牛在21.4（奥地利）和38.3公斤之间找到了最高的性能。每牛和日（西班牙）。有趣的是，与A组中B组的奶牛比A组牛群相比显着较低（每日牛奶产量少0.9-2.4％）甚至对D组中的奶牛造成特别显着的掉落（每日产量减少17.5-38.5％），甚至更加重要。这些趋势可以在参与本研究的所有国家都观察到。各国之间的四个不同UHG中的奶牛比例在各国之间不同，根据季节，各国略有变化，取决于牛奶中的平等和日子，并且被认为在牛群之间变化。总之，本研究表明，根据基于SCC和DSCC的组合定义的乳房健康状况，乳制品母牛的性能变化。特别是UHG B和D中的奶牛感兴趣，因为它们不能仅识别SCC。尽管如此，可以根据新的UHG采取的实际乳房健康管理措施仍需要进一步调查。

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