Abstract
As NZ milk production is predominantly seasonal and reliant on pasture growth, a high pregnancy rate within a short time after planned start of mating is essential to match feed supply to production. A Holstein-Friesian strain trial was established in Hamilton, New Zealand, to investigate the physical and financial performance of three strains of dairy cattle under a range of pasture based systems that differ in stocking rate and supplementary feeding. The three strains of cows were: Overseas High genetic merit (OS), New Zealand High genetic merit (NZH) and New Zealand Low genetic merit (NZL). The objective of this study was to predict reproductive performance from information available prior to mating, as an aid to on-farm decisions.
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