Factors related to dairy herds with a high and low incidence of ketosis
Simensen, E.; Gillund, P.; Lutnaes, B.; Alstad, O.; Halse, K.
Acta Veterinaria Scandinavica 29(3-4): 377-383
1988
ISSN/ISBN: 0044-605X PMID: 3256235 Document Number: 322040
Factors associated with the incidence of ketosis were studied in 10 herds with a high incidence of the condition (H herds) and 12 herds with a low incidence, (L herds), based on available production data and one-day recordings undertaken once in each herd. Annual milk yield was at the same level in H and L herds. Fat-corrected (4% standard) maximum daily milk yield was significantly lower, and corresponding % milk fat significantly higher, in the H herds. Feeding control showed that about one fattening feed unit more of roughages was fed per cow per day in the L herds, in which the roughage diet was also more varied. In the H herds, plasma acetoacetate and free fatty acid levels were higher 2-30 and 31-60 days after calving, whereas plasma glucose levels were lower 2-30 days after calving. The acetoacetate level in morning milk and in blood plasma before feeding were significantly correlated (r = 0.971). The estimated energy balance for cows 2-60 days after calving was at the same level in both herd categories. The study design used did not appear to be suited for revealing causal factors as a basis for preventive action in herds with a high incidence of ketosis.