Abstract
Reduced reproductive performance of dairy cows is a major challenge facing the dairy industry. Many potential replacement heifers fail to reach their first lactation because they are either born dead, die as juveniles, or fail to conceive. Perinatal mortality has previously been estimated across English herds as 7.8% (Esslemont & Kossaibati, 1996), whereas neonatal mortality in the UK has been estimated at 0 to 10% (reviewed by Mellor & Stafford, 2004). Calf mortality is often poorly documented and estimates that are available are possibly underestimated because a dead calf at birth is not always recorded at the farm level. Therefore, the objective of this study was to accurately calculate the incidence of perinatal and neonatal mortality of dairy calves on commercial farms in southern England.
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