De pariteit als mogelijk selectiecriterium voor het selectief droogzetten
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This study, with the objective of researching the parity as a possible selection criterion to se-lective dry cow management of dairy cows in Holland, was undertaken between October 2011 and March 2012 in Holland under responsibility of the Gezondheidsdienst voor Dieren in Deventer. A lot of visits have been taken to dairy farms for taken milking samples. Confounding factors on the parity as cause and clinical mastitis in the early lactation (CMEL) as outcome have been researched. The confounders are the cow cell count, 24h-milk production, teat end callosity score and positive outcome of bacteriological research on the moment of dry cow management and the history of clinical mastitis in the last lactation. Low parity dairy cows have significantly less risk than old parity cows to develop a (CMEL), but it depends on the height of cow cell count. The other confounders have no strong significant effect on the relationship between the parity and CMEL. It suggested that the parity is a reliable selection criterion to selective dry cow management, but further and especially more accurately research with better selection criteria for the herds, cows and quarters is needed.