Effects of omitting the dry period on plasma progesterone and prolactin during lactogenesis and on colostrum IgG content in dairy cows during the periparturient period

摘要

Omitting the dry period represents a strategy that may reduce the metabolic stress in early lactating cows (e.g. Andersen et al, 2005). A drawback of continuous milking with no dry period might compromise colostrum quality in goats (Caja et al, 2006):however, insufficient studies have been carried out to confirm this in dairy cows.The objective of this study was to evaluate the effects of omitting the diy period on key hormone patterns during lactogenesis and the IgG content of colostrum in periparturient dairy cows.