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A survey of Border Leicester reproductive efficiency.

1970; Volume: 8; Linguagem: Inglês

Alan Trounson, E. M. Roberts,

Reproductive Physiology in Livestock

Data have been analysed from the British Breeds’ Flock Books for 1966 and 1967 on the reproductive effciency of Border Leicester studs (147 in 1966 and 140 in 1967) with 200 or more breeding ewes. This has revealed poor net reproductive efficiency in contrast to the breed’s proclaimed ability to produce large numbers of multiple births. A mean of 86 per cent of lambs reaching seven months of age, based on the number of ewes joined, is an indication of some failure in reproductive ability. The literature suggests that a high proportion of ewes failing to establish and maintain pregnancy, and a high lamb mortality, are contributory factors to these low net reproductive efficiencies.