Influence of pathogens specific subclinical mastitis on oxidative status and mineral metabolism of yak

Suman Biswas , Reena Mukherjee , Soumendu Chakravarti , Asit Kumar Bera , Samiran Bandyopadhyay , Ujjwal Kumar De , Sanjoy Datta
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Abstract

Yaks are the lifeline of the tribal nomadic herdsmen/ highlanders. The present investigation was carried out to study the alteration of milk and serum micro-minerals with antioxidant status in sub-clinically affected yak. A total 420 mammary quarters from 120 yaks were screened for intramammary infection (IMI). Out of 420 mammary quarters of yaks, 62 were found positive for subclinical mastitis. Out of 62 quarters, 19, 16 and 15 quarters were found to be positive for Staphylococcus aureus (S. aureus), Escherichia coli (E. coli) and Streptococcus agalactiae (S. agalactiae) respectively. A total 48 quarters were selected for this study. 12 clinically healthy quarters and 12 each quarter from S. aureus, E. coli and S. agalactiae infected mammary quarters were selected and formed Group I, II, III and IV respectively. Oxidative stress was measured on the basis of estimation of malondialdehyde (MDA), ceruloplasmin and nitric oxide (NO) in serum. Serum copper, cobalt, zinc and iron were also estimated. The serum malondialdehyde (MDA) and ceruloplasmin level was significantly (p < 0.05) higher in infected groups as compared to healthy quarters. Maximum nitric oxide (NO) activity was exhibited in S. aureus group followed by E. coli group and S. agalactiae group infected quarters. Among the infected quarters, lowest and highest concentrations of minerals were found in S. aureus infected quarters and E. coli infected quarters respectively. Alterations of milk mineral profiles were more significant in S. aureus group as compared to other groups whereas serum mineral profiles were having significant alteration in between all the groups.

病原体特异性亚临床乳腺炎对牦牛氧化状态和矿物质代谢的影响
牦牛是部落游牧牧民/高地人的生命线。本研究旨在研究亚临床发病牦牛乳汁和血清微量矿物质抗氧化状态的变化。对120头牦牛共420个乳节进行了乳内感染(IMI)筛查。在420头牦牛的乳腺中,有62头亚临床乳腺炎呈阳性。在62个季度中,分别有19个、16个和15个季度对金黄色葡萄球菌、大肠杆菌和无乳链球菌呈阳性。本研究共选择了48个季度。选择临床健康的12个季度和金黄色葡萄球菌、大肠杆菌和无乳双歧杆菌感染的乳腺季度各12个季度,分别组成第一组、第二组、第三组和第四组。根据血清丙二醛(MDA)、铜蓝蛋白和一氧化氮(NO)测定氧化应激。还估算了血清铜、钴、锌和铁。感染组的血清丙二醛(MDA)和铜蓝蛋白水平显著(p<0.05)高于健康组。金黄色葡萄球菌感染区一氧化氮(NO)活性最高,其次是大肠杆菌感染区和无乳链球菌感染区。在感染区中,金黄色葡萄球菌感染区和大肠杆菌感染区的矿物质浓度分别最低和最高。与其他组相比,金黄色葡萄球菌组的牛奶矿物质谱变化更为显著,而血清矿物质谱在所有组之间都有显著变化。
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