Survey observations on the reproductive performance of both romney stud and commercial flocks throughout New Zealand

摘要

The results of an intensive survey conducted during 1964#x2013;68, which examined the reproductive performance of 184,217 ewes in registered Romney stud flocks throughout New Zealand, are given. The flocks, situated in six geographical localities based on latitude, were not a random sample and represented the upper limits of reproductive performance quoted in an earlier paper. The following are conclusions from the data: #x2014;