Pikhtirova A, Bujok J, Pecka-Kiełb E, Zachwieja A, Vasil M, Elečko J, Zigo F
Department of Public Health, Sumy State University, Rymskogo-Korsakova 2, Sumy 40007, Ukraine.
Department of Biostructure and Animal Physiology, The Faculty of Veterinary Medicine, Wrocław University of Environmental and Life Sciences, Norwida 31, Wrocław 50-375, Poland.
Iran J Vet Res. 2020 Summer;21(3):216-220.
Mastitis in sheep caused by spp. is a serious concern for dairy farming.
The objective of this study was to evaluate the impact of the intramammary infection (IMI) caused by spp. on the lon g-chain fatty acid profile and composition of ewe's milk.
The experiment was conducted in a herd of Zoslachtena Valaska sheep. Half-udder milk samples were collected from 20 weight-matched sheep at the peak of their first or second lactation. The basic physicochemical composition of milk, somatic cell count (SCC), spp. infection, and total bacterial contamination (TBC) were determined. The fatty acid profile of the milk fat was determined using gas chromatography.
The SCC in milk infected with spp. was 3.25 times higher (P<0.01) than that in the uninfected milk samples. The content of lauric acid (С12:0) was higher (P<0.05) in the milk fat of infected ewes. A significant increase (P<0.05) in the share of linoleic acid (C18:2n6t), arachidonic acid (C20:4n6), and a decrease (P<0.01) in the vaccenic acid (C18:1n7t) were observed in the milk collected from ewes infected with spp.. spp. infection increased the ratio of n-6 to n-3 polyunsaturated fatty acids.
Changes in the fatty acid profile of milk caused by spp. infection decrease the value of ewes' milk as a health-promoting product.
由 spp. 引起的绵羊乳腺炎是奶牛养殖中的一个严重问题。
本研究的目的是评估由 spp. 引起的乳房内感染（IMI）对母羊乳汁长链脂肪酸谱和组成的影响。
实验在一群佐斯拉赫特纳瓦拉斯卡羊中进行。在20只体重匹配的绵羊第一次或第二次泌乳高峰期采集半乳区乳汁样本。测定了乳汁的基本理化组成、体细胞计数（SCC）、 spp. 感染情况和总细菌污染（TBC）。使用气相色谱法测定乳脂肪的脂肪酸谱。
感染 spp. 的乳汁中SCC比未感染的乳汁样本高3.25倍（P<0.01）。感染母羊的乳脂肪中月桂酸（С12:0）含量更高（P<0.05）。在感染 spp. 的母羊采集的乳汁中，观察到亚油酸（C18:2n6t）、花生四烯酸（C20:4n6）的比例显著增加（P<0.05），而反式vaccenic酸（C18:1n7t）的比例下降（P<0.01）。 spp. 感染增加了n-6与n-3多不饱和脂肪酸的比例。
由 spp. 感染引起的乳汁脂肪酸谱变化降低了母羊乳汁作为健康促进产品的价值。
