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- W1968651853 abstract "SUMMARY Maternal performance of female sheep of three hill breeds, Scottish Blackface, Cheviot and Welsh Mountain, and the crosses among these breeds has been studied in terms of lifetime production and some of its components. The data are based on 193 ewes, which were given the opportunity of having four annual lamb crops, and their lambs. There was no significant variation among the breeds and crosses in ewe survival or in the proportion of barren ewes at each lambing. There was significant variation among the breeds and crosses in the number of lambs born per ewe lambing, in lamb survival and in weights of lamb at birth and at weaning. Crossbred ewes (producing crossbred lambs) had more and heavier lambs than expected from the average of the pure breeds contributing to each cross, but the three crossbred types differed in the amount of heterosis shown. Over their lifetime in the flock there were significant breed differences in the total weight of lambs weaned, with crossbred ewes producing about 9% more than the average of the parent breeds involved. The crossbred ewes produced more weight of lambs over their lifetime than pure Cheviot or pure Welsh Mountain ewes, but not as much as pure Scottish Blackface. Effects of parity of dam and of sex, birth type, and type of rearing of lamb are given." @default.
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- W1968651853 date "1975-02-01" @default.
- W1968651853 modified "2023-09-25" @default.
- W1968651853 title "Maternal performance in sheep as affected by breed, crossbreeding and other factors" @default.
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- W1968651853 doi "https://doi.org/10.1017/s0003356100034978" @default.
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