The prevalence of some microorganisms in cows' milk with regard to lactation number, lactation period and somatic cell count.

IF 1
R Mišeikienė, S Tušas, J Rudejevienė, M Virgailis, B Pilarczyk, A Tomza-Marciniak
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Abstract

The aim of this study was to assess the effect of lactation number, lactation stage and somatic cell count (SCC) on the presence of pathogenic or opportunistic pathogens in cow milk. A total of 1712 milk samples were collected from the udder quarters of 428 lactating Holstein breed cows for bacteriological examination. Somatic cell count was taken from the controlled bovine records. The cows were divided into four groups according to the lactation number (viz. lactation numbers 1, 2, 3, 4 and above) and into three groups according to the lactation month (viz. 1-4, 5-8, 9 months and above). The statistical analysis was performed by SPSS 27.0 software (SPSS Inc., Chicago, Illinois, USA). Frequencies of microorganisms were calculated by determining their confidence intervals (Wilson Confidence Interval 95%, CI). Various farm pathogens were identified: CNS (Coagulase negative staphylococci), S. aureus, Enterococcus spp., Str. agalactiae, E. coli. It was found that CNS and S. agalactiae increased with somatic cell count, lactation number and lactation stage. E. coli increased at the end of the lactation stage (p≤0.05). Enterococcus spp. count in milk differed significantly between cows in lactations 1 and 4 and older (p≤0.05). Pathogen number also increased with milk fat, but decreased with increased protein content (p≤0.01).

奶牛乳中某些微生物的流行与泌乳次数、泌乳期和体细胞数的关系。
本研究的目的是评估泌乳次数、泌乳期和体细胞计数(SCC)对牛奶中致病菌或条件致病菌存在的影响。从428头泌乳荷斯坦奶牛的乳房收集1712份乳样进行细菌学检查。体细胞计数取自对照牛的记录。将奶牛按泌乳数(即泌乳数1、2、3、4及以上)分为4组,按泌乳月份(即1-4、5-8、9个月及以上)分为3组。采用SPSS 27.0软件(SPSS Inc., Chicago, Illinois, USA)进行统计分析。通过确定其置信区间(威尔逊置信区间95%,CI)计算微生物的频率。鉴定出多种农场病原菌:凝固酶阴性葡萄球菌(CNS)、金黄色葡萄球菌、肠球菌、无乳链球菌、大肠杆菌。结果发现,CNS和无乳链球菌随着体细胞数、泌乳数和泌乳期的增加而增加。在泌乳期末,大肠杆菌数量增加(p≤0.05)。泌乳1、4期及以上奶牛乳中肠球菌数量差异显著(p≤0.05)。病原菌数量随乳脂含量的增加而增加,随蛋白质含量的增加而减少(p≤0.01)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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