By Mee, J. F. and Rogers, P. A. M., Irish Veterinary Journal, 1996
Description
Infertility in Irish beef heifers has been associated with long term molybdenum intake in conjunction with low copper status. However, the importance of selenium, iodine and cobalt deficiency in the fertility of Irish dairy herds has not been established in controlled experiments nor has the role of copper and cobalt deficiency in calf mortality. Although selenium deficiency is a feature of perinatal calf mortality, controlled supplementation studies generally have not reduced calf mortality. The frequency of thyroid hyperplasia in stillborn calves has been reduced by prepartum iodine supplementation but the calf mortality rate did not decrease in controlled experiments. The role of trace elements in the occurrence of calving problems or mastitis in Irish dairy herds has not been established. There is a poor correlation between milk yield and the trace element status of Irish dairy farms. Liveweight gain responses to copper or selenium supplementation are inconsistent while very few data are published on the effects of iodine or cobalt deficiency on weight gain in Irish cattle. Specific types of lameness and diarrhoea have been associated with copper deficiency in Irish herds. Coat changes in Irish beef herds have been associated with copper deficiency in Irish herds. Coat changes in Irish beef herds have been associated with copper deficiency; the relationship in dairy herds is unclear
Infertility in Irish beef heifers has been associated with long term molybdenum intake in conjunction with low copper status. However, the importance of selenium, iodine and cobalt deficiency in the fertility of Irish dairy herds has not been established in controlled experiments nor has the role of copper and cobalt deficiency in calf mortality. Although selenium deficiency is a feature of perinatal calf mortality, controlled supplementation studies generally have not reduced calf mortality. The frequency of thyroid hyperplasia in stillborn calves has been reduced by prepartum iodine supplementation but the calf mortality rate did not decrease in controlled experiments. The role of trace elements in the occurrence of calving problems or mastitis in Irish dairy herds has not been established. There is a poor correlation between milk yield and the trace element status of Irish dairy farms. Liveweight gain responses to copper or selenium supplementation are inconsistent while very few data are published on the effects of iodine or cobalt deficiency on weight gain in Irish cattle. Specific types of lameness and diarrhoea have been associated with copper deficiency in Irish herds. Coat changes in Irish beef herds have been associated with copper deficiency in Irish herds. Coat changes in Irish beef herds have been associated with copper deficiency; the relationship in dairy herds is unclear
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