Clinical observations and laboratory analysis of factors that affect the survival and performance of beef cattle

Abstract

Clinical and laboratory trials on the survival and performance of beef calves were carried out during 1985-1987, in Idaho, USA. Maternal factors examined were: calving, lactation and mothering scores; body weight; calving intervals; udder conformation; age; colostrum quality (total immunoglobulin (TIG) concentration). Factors examined in calves were: rectal temperature and vigour scores; morbidity and mortality; age at first sucking; age of first observed illness; serum TIG concentration; use of protective shelters. Mortality was low. The majority of illness was enteric and occurred during the first 2 weeks of life. Morbidity was lower in 1986 and 1987, which may be explained by improved sanitation procedures, use of protective shelters and improvements in the passive immunity of the calves.