Borş Alina, Borş Silviu-Ionuț, Floriștean Viorel-Cezar
Department of Public Health, Faculty of Veterinary Medicine, "Ion Ionescu de la Brad" Iasi University of Life Sciences, Iaşi, Romania.
Research and Development Station for Cattle Breeding Dancu, Iaşi, Romania.
Front Vet Sci. 2024 Jan 8;10:1345782. doi: 10.3389/fvets.2023.1345782. eCollection 2023.
Poor udder health can have a negative impact on milk production and reproductive performance, which reduces the net present value (NPV) of dairy farms. The aim of this study is therefore to investigate the relationship between clinical mastitis and NPV and the financial impact of impaired reproductive function. For this purpose, 473 dairy cows were included in our study, 146 cows with clinical mastitis (CM group) and 327 clinically healthy cows (CH group) from a high-yielding dairy farm in Romania, milking approximately 780 dairy cows with an average milk production of 46 kg milk/day. We found that, in contrast to CH cows, CM cows had a significantly lower conception rate at first service (58.2% vs. 41.7%, < 0.05), third service (45.3% vs. 30.2%, < 0.05), and total services (49.2% vs. 36.4%, < 0.05). However, this positive effect was not observed for the average days open, which were significantly lower in CM cows than in CH cows (112 ± 4.3 days vs. 142 ± 3.1 days, < 0.05). The fact that the non-pregnant CH cows had higher somatic cell counts (>400,000 SCC/mL) in their milk around artificial insemination (AI) and 1 month earlier than the pregnant cows (<250,000 SCC/ml) supports the idea that poor uterine health affects the reproductive activity of high-yielding cows. However, by using the UW-DairyRepro$ decision support tool, we found that despite the impairment of reproductive function in dairy cows, the largest negative impacts on NPV are still the cost of milk loss (US$14,439.4/farm/year) and treatment costs (US$4,380/farm/year). We considered the costs associated with poor reproductive function in the CM group (US$3,577/farm/year) as an additional cost of mastitis. Finally, it appears that the impact of mastitis on reproduction is associated with a lower chance of conception than it is with a daily risk of services.
乳房健康不佳会对产奶量和繁殖性能产生负面影响，从而降低奶牛场的净现值（NPV）。因此，本研究的目的是调查临床型乳房炎与净现值之间的关系以及繁殖功能受损的财务影响。为此，我们的研究纳入了473头奶牛，其中146头患有临床型乳房炎（CM组），327头临床健康奶牛（CH组），这些奶牛来自罗马尼亚的一个高产奶牛场，该奶牛场约有780头奶牛挤奶，平均日产奶量为46千克。我们发现，与CH组奶牛相比，CM组奶牛在首次输精时的受胎率显著更低（58.2%对41.7%，<0.05），第三次输精时（45.3%对30.2%，<0.05）以及总输精次数时（49.2%对36.4%，<0.05）。然而，在平均空怀天数方面未观察到这种差异，CM组奶牛的平均空怀天数显著低于CH组奶牛（112±4.3天对142±3.1天，<0.05）。未怀孕的CH组奶牛在人工授精（AI）前后及其前1个月时牛奶中的体细胞计数高于怀孕奶牛（>400,000个体细胞/毫升对<250,000个体细胞/毫升），这一事实支持了子宫健康不佳会影响高产奶牛繁殖活动的观点。然而，通过使用UW-DairyRepro$决策支持工具，我们发现尽管奶牛的繁殖功能受损，但对净现值的最大负面影响仍然是牛奶损失成本（14,439.4美元/农场/年）和治疗成本（4,380美元/农场/年）。我们将CM组中与繁殖功能不佳相关的成本（3,577美元/农场/年）视为乳房炎的额外成本。最后，似乎乳房炎对繁殖的影响与受胎几率降低的关联比与每日输精风险的关联更大。
