Wiszniewska-Łaszczych Agnieszka, Liedtke Katarzyna G, Szteyn Joanna M, Lachowicz Tomasz
Departament of Veterinary Public Health, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 14, 10-718 Olsztyn, Poland.
Voivodship Veterinary Nnspectorate in Olsztyn, Szarych Szeregów 7, 10-072 Olsztyn, Poland.
Animals (Basel). 2020 Mar 15;10(3):490. doi: 10.3390/ani10030490.
Paratuberculosis is a chronic, progressive enteritis of ruminants, caused by subspecies . It affects the productivity of infected dairy cows, causing a reduction in the daily milk yield and basic milk components. The aim of the study was to determine the effect of subspecies on the productivity of dairy cows in two herds. The research materials were serum and milk samples taken from cows from two naturally infected dairy herds. All serum samples were serologically tested using the Antibody ELISA Kit by IDEXX-Screening and Verification. Seroprevalence differed between the herds (5.7% and 11.3%). Seroprevalence varied also between the groups of lactation. The highest seroprevalence was found in the first lactation group in both herds. The milk yield evaluation and analysis of the basic milk components' content (protein and fat total solids) were tested once a month during one lactation period. The content of the basic milk components varied depending on the lactation group, as well as the serological status of the cows. A decrease in milk yield was observed in cows in herds with a higher seroprevalence (>11%). The largest decrease in milk yield and basic milk components was observed in older animals (>three lactations).
副结核病是反刍动物的一种慢性、进行性肠炎，由亚种引起。它会影响受感染奶牛的生产力，导致日产奶量和基本乳成分减少。本研究的目的是确定亚种对两个牛群中奶牛生产力的影响。研究材料是取自两个自然感染奶牛群中奶牛的血清和乳样。所有血清样本均使用IDEXX筛查和验证的抗体ELISA试剂盒进行血清学检测。两个牛群的血清阳性率不同（5.7%和11.3%）。血清阳性率在不同泌乳组之间也有所不同。在两个牛群的第一泌乳组中血清阳性率最高。在一个泌乳期内，每月对产奶量进行一次评估，并对基本乳成分（蛋白质和脂肪总固体）的含量进行一次分析。基本乳成分的含量因泌乳组以及奶牛的血清学状态而异。在血清阳性率较高（>11%）的牛群中，奶牛的产奶量有所下降。在年龄较大的动物（>三个泌乳期）中，产奶量和基本乳成分的下降幅度最大。
