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Abstract
Extract
Area surveys of East Coast breeding herds in New Zealand have indicated that poor nutrition, infectious genital disease and post-partum calf losses were major factors resulting in lowered calf-marking percentages (Fielden and McFarlane, Citation1959; Young, Citation1965). The importance of each or any combination of factors appeared to vary greatly between properties. In an attempt to break up the existing fertility problem into the more important biological components it was decided to study the performance of identified females in several selected herds. The investigation was implemented as an extension of normal clinical practice.