Transition Cow Management to Reduce Metabolic Diseases and Improve Reproductive Management
نویسندگان
چکیده
The dairy industry in North America has changed dramatically with a trend in direction of larger herds and higher production per cow, which seems to be associated with a decrease in fertility, especially a decrease in conception rates and extension of calving intervals (Butler, 2000; Lucy, 2001; Stevenson, 2001) This decline in fertility of lactating dairy cows is observed not only in North America, but also in the United Kingdom (Royal et al., 2000) and Israel (Zeron et al., 2001) Fertility measures of lactating dairy cows have reached at an all time low in 1999 in the US, with services per conception of 3.0 in 143 dairy herds monitored by the Raleigh DHIA record system (Lucy, 2001) This is similar to results reported by Overton (2002) in California with over 100,000 cows in approximately 100 dairy herds in which conception rates averaged 30.8%.
منابع مشابه
Connecting Transition Cow Physiology, Behavior, and Nutrition
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