By I.Fayez Marai, John B. Owen
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Additional resources for New Techniques in Sheep Production
And D A V I S , G . H . (1985). The single gene inheritance of the prolificacy of the Booroola Merino. In Genetics of Reproduction in Sheep, edited by R . B . Land and D . W . Robinson, pp. 115-125. , R A Z U N G L E S , J. and L A J O U S , D . (1982). Heritability of ovulation rate and level of embryonic losses in Romanov breed. Second World Congress on Genetics Applied to Livestock Production, 1 , pp. 5 9 1 - 5 9 7 . , L A J O U S , D . and E Y C H E N N E , F. (1986). Genetic aspects of ovulation rate and embryo mortality in Romanov ewes.
Proceedings of the Second World Congress on Sheep and Beef Cattle Breeding, pp. 7 2 1 - 7 2 4 D A V I S , G . H . , M O N T G O M E R Y , G . W . , A L L I S O N , A . J . W. and B R A Y , A . R . (1982). Segregation of a major gene influencing fecundity in progeny of Booroola sheep. New Zealand Journal of Agricultural Research, 25, 5 2 5 - 5 2 9 D I C K E R S O N , G. (1970). Efficiency of animal production: moulding the biological components. , B O U I X , J. and R I C O R D E A U , G. (1985).
Maund, personal communication). The ovulation rate of Cambridge ewes was investigated recently (Hanrahan and Owen, 1985) and revealed a variation (within age groups) of two to 13 ova. 55), strongly suggests that a gene with a large effect on ovulation is segregating in this breed. This hypothesis was examined by cluster analysis of ovulation data on 70 ewes each with two records. 0. This preliminary evidence suggests that a gene with an effect greater than two ova is segregating in the Cambridge breed.