荷斯坦牛产后前60 d患隐性乳房炎次数对各泌乳月SCS的影响

doi:10.11843/j.issn.0366-6964.2021.02.008

摘要/Abstract

摘要： 荷斯坦牛产后前60 d患隐性乳房炎（SCM）次数反映了泌乳牛产后乳房的生理健康状况。本研究旨在探究荷斯坦牛产后前60 d患SCM次数对各泌乳月体细胞评分（somatic cell score，SCS）的影响，以期为牧场及时采取相关措施进行隐性乳房炎防控提供科学依据。本研究收集江苏地区12个奶牛场2017—2019年荷斯坦牛365 105条DHI测定日记录，并利用一般线性模型分析荷斯坦牛产后前60 d患SCM次数对不同胎次、牧场规模、测定季节、产犊季节各泌乳月SCS的影响。结果表明，荷斯坦牛产后前60 d患SCM次数对不同胎次、牧场规模、测定季节和产犊季节各泌乳月SCS均有极显著影响（P<0.01）；5胎及以上和夏季产犊的荷斯坦牛产后前60 d患SCM的比例较高；中小规模牧场和夏、秋季节产犊的荷斯坦牛各泌乳月SCS随产后前60 d患SCM次数的增加极显著增加（P<0.01）；随着泌乳月的增加，产后前60 d SCS与各泌乳月SCS的相关系数逐渐下降，头胎牛产后前60 d SCS与第3~7泌乳月SCS的相关系数最低，4胎牛较高；秋季产犊的荷斯坦牛产后前60 d SCS与第3~5泌乳月SCS相关系数均大于0.43，高于其他产犊季节。该结果有利于牧场根据奶牛产后前60 d患SCM次数乳对泌乳中后期SCS进行预测，从而指导牧场及时采取相关措施进行隐性乳房炎防控。

关键词: 隐性乳房炎, 体细胞评分, 荷斯坦牛

Abstract: The number of subclinical mastitis (SCM) infection during first 60 days after calving reflects the physiological health of the mammary gland of Holstein cows. This study aimed to explore the effects of the number of SCM infection during first 60 days after calving on somatic cell score (SCS) of lactation months in Holstein cows, and provide scientific reference for farm management for prevention, control and treatment of SCM. A total of 365 105 DHI records of Holstein cows were collected from 12 dairy farms in Jiangsu province from 2017 to 2019, and the impacts of the number of SCM infection during first 60 days after calving on SCS of lactation months of cows with different parities, farm size, tested seasons and calving seasons were analyzed using general linear model (GLM). The results showed that the number of SCM infection in first 60 days after calving had extremely significant effects on milk SCS of lactation months of Holstein cows with different parities, farm size, tested seasons and calving seasons (P<0.01). Holstein cows with 5^th and above parity or calved in summer had higher SCM incidence during first 60 days after calving. The SCS of lactation months of cows showed extremely significant increase along with the increasing number of SCM infection in first 60 days after calving in small- and medium-size farms and cows that calved in summer and autumn (P<0.01). The correlation coefficient between SCS in first 60 days after calving and SCS in each lactation month decreased gradually with the increase of lactation months. The lowest correlation coefficients between SCS in first 60 days after calving and SCS from 3^rd to 7^th lactation month were observed in cows of 1^st parity, but higher in cows of 4^th parity. Cows calved in autumn showed greater than 0.43 of correlation coefficients between SCS in first 60 days after calving and SCS from 3^rd to 5^th lactation month, which was higher than other seasons. The results are helpful for dairy farms to predict SCS in mid-late lactation according to the number of SCM infection during first 60 days after calving, so as to guide dairy farms to take relevant measures in time to prevent and control SCM.

Key words: subclinical mastitis (SCM), somatic cell score (SCS), Holstein cows

中图分类号:

S823.2

梁艳, 王海洋, 郭梦玲, 张强, 高启松, 李明勋, 张慧敏, 杨章平, 毛永江. 荷斯坦牛产后前60 d患隐性乳房炎次数对各泌乳月SCS的影响[J]. 畜牧兽医学报, 2021, 52(2): 352-363.

LIANG Yan, WANG Haiyang, GUO Mengling, ZHANG Qiang, GAO Qisong, LI Mingxun, ZHANG Huimin, YANG Zhangping, MAO Yongjiang. Effects of the Number of Subclinical Mastitis Infection during First 60 Days after Calving on SCS of Lactation Months of Holstein Cows[J]. Acta Veterinaria et Zootechnica Sinica, 2021, 52(2): 352-363.

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