The reproduction and growth of contemporary hogget ewes from a breed development project were analysed to assess any decline in performance from the first to second generation. Data were from 452 ewes (progeny of 48 sires) of Booroola Merino x Dorset (BD) and Trangie Fertility Merino x Dorset (TD) breeds (FI) and their reciprocal crosses (F2) over two years. F2 ewes had 2 to 4% (P<.05) lower liveweight than FI ewes but there was no significant difference for wool weight, ovulation rate and reproductive rate and its components. FI BD ewes had an advantage over TD ewes of 20 to 30% (P<.01) for ovulation rate, litter size and lambing rate (born), but these differences were reduced to non-significance when ewes carrying the Booroola F gene were deleted from the analysis.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 553–558, 1986
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