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- W2318205237 abstract "Abstract The relationship of oestrous behaviour and ovulation rate of hoggets and at 2 years of age to subsequent lambing performance in Romney and Border Leicester × Romney ewes grazed at the Whatawhata Hill Country Research Station from 1965 to 1971 are reported. Mean age at first 2-year-old oestrus was lower in first- and third-cross than in Romney and second-cross ewes. Live weight at first oestrus was lower for Romneys, declining with interbreeding of the Border Leicester crossbreds. Ovulation rate at first 2-year-old oestrus increased from 1.00 to 1.19 to 1.40 for Romneys and from 1.28 to 1.41 to 1.61 for crossbreds that had 0, 1, or 2 corpora lute a at first measured hogget ovulation rate. There were higher lambing percentages at the 2- to 4-year-old lambings from ewes that had exhibited oestrus as hoggets, but there was not a consistent difference between those with single and multiple hogget ovulations. Overall, the difference in lambs born over four lambings between those that showed hogget oestrus and those that did not was 0.56 ± 0.17 for Romneys and 0.68 ± 0.14 for crossbreds. Correlations of hogget body weight and subsequent fertility are given. The standard deviation of hogget body weight among ewes of similar subsequent fertility was 4.4 kg, so that the culling of flock replacements on the basis of hogget body weight will not normally influence overall flock fertility. Only 8% of the variation in number of lambs born over four lambings was accounted for by the relationships with hogget body weight and number of hogget oestrous cycles." @default.
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- W2318205237 date "1976-08-01" @default.
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- W2318205237 title "Hill country sheep production" @default.
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- W2318205237 doi "https://doi.org/10.1080/00288233.1976.10429067" @default.
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