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- W2899682420 abstract "Abstract Mean live weights at four times of the year are given for Romney and Border Leicester X Romney ewes grazed on hill country from 1959 to 1967. Flock, ewe age, and seasonal influences are summarised. There was a marked increase in mean pre-tupping live weight from Romney (43.7 kg) to first-cross ewes (50.0 kg) and a decrease with interbreeding to second- (46.5 kg) and third-cross (44.7 kg) ewes. A similar pattern was evident in ewe live weights post-tupping, pre-lambing, and at weaning. Ewe live weights increased with age and as the experiment progressed from 1959 to 1967. Statistically significant differences in weight were found between lambing classes when ewes were classified as having 0, 1, or 2 or more lambs. Ewes having multiple births were heaviest pre- and post-tupping and pre-lambing, but were lighter at weaning. Relationships between fertility ratios and live weight calculated by grouping ewes in live weight ranges are also presented. It is concluded that the difference in fertility between Romney and first-cross Border Leicester X Romney ewes, or between age-of-ewe groups, could not be attributed to live-weight differences alone. The effects on flock productivity of culling on the basis of pre-tupping live weight are discussed." @default.
- W2899682420 created "2018-11-16" @default.
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- W2899682420 date "1973-08-01" @default.
- W2899682420 modified "2023-09-25" @default.
- W2899682420 title "Hill country sheep production" @default.
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- W2899682420 doi "https://doi.org/10.1080/00288233.1973.10421129" @default.
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