Yang Feng Li, Shen Chen, He Bao Xiang, Yang Yu Ying, Gong Da Chun, Li Xiao Shan
College of Animal Science, Yangtze University, Jingmi Road 88#, Jingzhou, People's Republic of China.
Trop Anim Health Prod. 2015 Jan;47(1):87-92. doi: 10.1007/s11250-014-0689-z. Epub 2014 Oct 8.
The purposes of this study were to determine the prevalence of heifer clinical mastitis (HCM) and heifer subclinical mastitis (HSCM), isolate HCM-causing bacteria, and assess the association of some risk factors in Huanggang, Central China. A total of 1,374 lactating heifers from three dairy farms were examined in the present study; 22.64% of heifers were positive for mastitis, out of which, 3.86 and 18.78% were with HCM and HSCM, respectively. Of the 67 HCM samples, 91.05% were single growth, 7.46% mixed growth, and 1.49% no bacterial growth. Coagulase-negative staphylococci (CNS) accounted for 30.98% of the isolates followed by Escherichia coli (29.58%), Staphylococcus aureus (16.9%), and Streptococcus uberis (11.27%). Logistic regression analyses showed that heifer milk yield lower than 3 L had the highest prevalence of HCM compared to heifer milk yield of more than 3 L (P < 0.01), and prevalence of HCM was significantly high in heifers with the presence of teat lesions (P < 0.01). Moreover, the heifer milk yield lower than 3 L had the highest prevalence of HSCM compared to heifer milk yield of more than 3 L (P < 0.01). These two factors were significantly associated with the occurrence of heifer mastitis, which needs to be considered in the prevention and control strategies of the disease.
本研究的目的是确定黄冈地区青年母牛临床型乳房炎（HCM）和青年母牛亚临床型乳房炎（HSCM）的患病率，分离引起HCM的细菌，并评估一些风险因素之间的关联。本研究共检查了来自三个奶牛场的1374头泌乳青年母牛；22.64%的青年母牛乳房炎检测呈阳性，其中HCM和HSCM的患病率分别为3.86%和18.78%。在67份HCM样本中，91.05%为单一细菌生长，7.46%为混合生长，1.49%未检测到细菌生长。凝固酶阴性葡萄球菌（CNS）占分离菌株的30.98%，其次是大肠杆菌（29.58%）、金黄色葡萄球菌（16.9%）和乳房链球菌（11.27%）。逻辑回归分析表明，与产奶量超过3升的青年母牛相比，产奶量低于3升的青年母牛HCM患病率最高（P < 0.01），乳头有损伤的青年母牛HCM患病率显著较高（P < 0.01）。此外，与产奶量超过3升的青年母牛相比，产奶量低于3升的青年母牛HSCM患病率最高（P < 0.01）。这两个因素与青年母牛乳房炎的发生显著相关，在该病的预防和控制策略中需要予以考虑。
