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Abstract
Blood concentrations of leptin, the first of several recently-discovered adipocyte proteins, putatively signal the extent of fat energy reserves to the hypothalamus in mammals and help regulate food intake and reproductive activity (through control of GnRH release). In early post-partum dairy cows, the rapidly increasing milk energy output and slowly increasing feed energy intake produce a negative energy balance (-ve EB) that is met by mobilisation of adipose fat stores and the severity and/or duration of the –ve EB may delay resumption of normal ovarian activity. The objective of the current study was to compare post-partum EB and serum leptin concentration profiles in Holstein-Friesian and Norwegian Red heifers, both of high genetic merit within their breed.
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