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Defects and bacterial pathogens in udders of non-dairy breed ewes from New Zealand
New Zealand Journal of Agricultural Research ( IF 1.8 ) Pub Date : 2021-03-25 , DOI: 10.1080/00288233.2021.1905005
Anne L. Ridler 1 , Gabby Rout-Brown 2 , Kate J. Flay 3 , Niluka Velathanthiri 1 , Alex Grinberg 1
Affiliation  

ABSTRACT

The objectives of this study were to identify the prevalence, incidence and range of udder defects in non-dairy breed ewes in New Zealand and to investigate the range of bacteria present in milk samples. The udders of 5700 mixed-age ewes on 11 sheep farms in the lower North Island of New Zealand were examined and scored at weaning. The majority were examined again 4–6 weeks later. Milk samples were aseptically collected from 110 ewes (195 udder halves) for bacterial culture. At the initial (weaning visit), 2.5% of ewes had udder defects, while 4–6 weeks later, an additional 2.4% of the remaining ewes had developed defects in the intervening period. In total, across the two visits, 4.5% of ewes were identified with udder defects (inter-farm range 2–7%). The most commonly identified defects were lumps in one udder half, followed by diffuse hardness in one udder half. A range of bacterial species were isolated from milk samples but Staphylococcus aureus was the most common species. These results demonstrate that udder defects are common in ewes in New Zealan, and farmers are recommended to examine ewes’ udders at least 4–6 weeks after weaning so that defective ewes are not bred.



中文翻译:

新西兰非乳品母羊乳房中的缺陷和细菌病原体

摘要

本研究的目的是确定新西兰非乳品母羊乳房缺陷的流行率、发生率和范围,并调查牛奶样本中存在的细菌范围。对新西兰下北岛 11 个养羊场的 5700 只混龄母羊的乳房进行了检查并在断奶时评分。大多数人在 4-6 周后再次检查。从 110 只母羊(195 个乳房半部)无菌收集牛奶样品用于细菌培养。在最初(断奶访问),2.5% 的母羊有乳房缺陷,而 4-6 周后,另外 2.4% 的剩余母羊在中间时期出现了缺陷。总的来说,在两次访问中,4.5% 的母羊被确定有乳房缺陷(农场间范围为 2-7%)。最常见的缺陷是乳房一半的肿块,其次是乳房一半的弥漫性硬度。从牛奶样品中分离出一系列细菌,但金黄色葡萄球菌是最常见的物种。这些结果表明,乳房缺陷在新西兰的母羊中很常见,建议农民在断奶后至少 4-6 周检查母羊的乳房,以免有缺陷的母羊繁殖。

更新日期:2021-03-25
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