economic data and performance records from 10 iranian holstein dairy cattle herds, as well as milk production and fertility records from iranian center of animal breeding and animal production improvment were used to estimate the effect of calving difficulty on milk production, fertility and as well on the economic aspects of maternal and direct calving difficulty. calving difficulty could be d...

This investigation aimed to determine the effects of some environmental factors on fertility traits and economic losses caused by deviations from ideal levels these parameters. The records 126 Holstein Simmental first-calf heifers three dairy cattle enterprises in Afyonkarahisar during period 2010 – 2016 were examined. technique ANOVA used detect different related calculated. ages at first calv...

Calf diarrhoea, the eighth most common cause of death in this age group, affects over 75% newborn calves under three weeks old. Fifty with diarrhoea from nine intensive dairy farms were assessed during study period. Of these, 72% (n =36) positive for E. coli There was a strong link between prevalence calf and groups. Therefore, those one month 1.3 more likely to be infected than months age. The...

Sischo, W.M., Hird, D.W., Gardner, I.A., Utterback, W.W., Christiansen, K.H., Carpenter, T.E., Danaye-Elmi, C. and Heron, B.R., 1990. Economics of disease occurrence and prevention on California dairy farms: a report and evaluation of data collected for the National Animal Health Monitoring System, 1986-1987. Prey. Vet. Med., 8: 141-156. A stratified random sample of 43 dairy herds in Californi...

Problem statement: A high mortality rate (crude mortality 43.6%) of pre-weaned dairy calves resulted in unavailability of replacement heifers in Kuwait. Dairy producers resorted to import pregnant heifers for herd replacement. This study was undertaken to investigate the effects of dam vaccination and age, serum Immunoglobulin (Ig) on disease syndromes and mortality in preweaned calves. Approac...

Our aim was to investigate the associations between management factors, compliance with current legislation, and herd-level calf mortality. In a national welfare audit, veterinary inspectors from Norwegian Food Safety Authority assessed legislation on (n = 912 herds). Nine criteria were rated as satisfactory (1) or not (0): housing, natural behavior, single pens, colostrum feeding, water, surve...

Gender of the calf whose birth initiates lactation could influence whole lactation milk yield of the dam due to hormonal influences on mammary gland development, or through calf gender effects on gestation length. Fetal gender could influence late lactation yields because cows become pregnant at peak lactation. The effects of calf gender sequences in parities 1-3 were assessed by separately fit...