Veterinary Faculty, University of Thessaly, Karditsa, Greece.
University Hospital of Larissa, Larissa, Greece.
J Dairy Res. 2020 Aug;87(3):277-281. doi: 10.1017/S0022029920000734. Epub 2020 Sep 4.
The objectives of this work were (a) to determine the presence of streptococci in samples from small ruminant dairy farms (bulk-tank milk and, where possible, teatcup swabs), (b) to investigate the potential adverse effects of streptococci on milk quality and (c) to investigate the importance of some husbandry factors for the isolation of streptococci. Bulk-tank milk samples and teatcups swab samples were examined bacteriologically for the presence of streptococci. Somatic cell counting and milk composition measurements were also performed. The husbandry factors present in each farm were assessed for potential associations with the isolation of streptococci. Streptococci were isolated from milk samples from 31.4% of sheep and 17.4% of goat farms and from 4.8% of sheep and 5.9% of goat teatcups. Streptococci were isolated more frequently from the upper part than the lower part of teatcups: 5.0% vs. 1.9%. Most isolates (57.9%) were identified as Streptococcus uberis. Most isolates (68.4%) were slime-producing; slime-production was more frequent among isolates from teatcups (83.3%) than from bulk-tank milk (55.0%). Somatic cell counts and milk composition did not differ between farms in which streptococci were or were not isolated. Machine-milking was associated with the isolation of streptococci from bulk-tank milk samples. The initial stage of the milking period (first two months) was found to be associated with the isolation of streptococci from milking machine teatcups in sheep farms only.
(a) 确定小反刍动物奶畜场（奶罐奶和如有可能则奶杯拭子）样本中链球菌的存在情况；(b) 调查链球菌对牛奶质量的潜在不利影响；(c) 研究一些养殖因素对链球菌分离的重要性。对奶罐奶样本和奶杯拭子样本进行了细菌学检查，以确定链球菌的存在情况。还进行了体细胞计数和牛奶成分测量。评估了每个牧场的养殖因素，以确定其与链球菌分离的潜在关联。从 31.4%的绵羊养殖场和 17.4%的山羊养殖场的牛奶样本中以及从 4.8%的绵羊养殖场和 5.9%的山羊养殖场的奶杯拭子中分离到链球菌。从奶杯拭子的上部而非下部更频繁地分离到链球菌：5.0%比 1.9%。大多数分离株（57.9%）鉴定为乳链球菌。大多数分离株（68.4%）为黏液产生株；在奶杯拭子分离株中黏液产生更为频繁（83.3%），而在奶罐奶分离株中则较少见（55.0%）。产链球菌和不产链球菌的牧场之间体细胞计数和牛奶成分没有差异。机器挤奶与从奶罐奶样本中分离链球菌有关。仅在绵羊养殖场中，挤奶机奶杯的初始挤奶期（头两个月）与链球菌的分离有关。
