Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú y đề tài: Contributions to variability of clinical measures for use as indicators of udder health status in a clinical protocol. | Acta Veterinaria Scandinavica BioMed Central Research Open Access Contributions to variability of clinical measures for use as indicators of udder health status in a clinical protocol C Fossing 1 M Vaarst1 H Houe2 and C Enevoldsen2 Address Department of Animal Health Welfare and Nutrition Danish Institute of Agricultural Science 8830 Tjele Denmark and 2Department of Large Animal Sciences The Royal Veterinary and Agricultural University 2000 Frederiksberg Denmark Email C Fossing - M Vaarst - H Houe - smt@ C Enevoldsen - ce@ Corresponding author Published 22 August 2006 Received II May 2006 Acta Veterinaria Scandinavica 2006 48 15 doi 1751-0147-48-15 Accepted 22 August 2006 This article is available from http content 48 1 15 2006 Fossing et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract A cross-sectional observational study with repeated observations was conducted on 16 Danish dairy farms to quantify the influence of observer parity time stage in lactation and farm on variables routinely selected for inclusion in clinical protocols thereby to enable a more valid comparison of udder health between different herds. During 12 months participating herds were visited 5 times by project technicians who examined 20 cows and scored the selected clinical variables. The estimates of effect on variables were derived from a random regression model procedure. Statistical analyses revealed that although estimates for occurrence of several the variables . degree of oedema varied significantly between observers the effects on many of these estimates were similar in size. Almost all estimates for occurrences of variables were .
