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A RELATIONSHIP BETWEEN THE DURATION OF OESTRUS, OVULATION RATE AND LITTER SIZE OF SHEEP

Summary.: The litter size of Finnish Landrace sheep was found to be positively correlated with the duration of oestrus at the time of mating. The within-year regression of litter size on duration of oestrus was 0·011 lambs/hr and the correlation between the two traits 0·18 (1% > P > 0·1%).

Data from Finnish Landrace x Blackface, Blackface and Merino x Blackface females, indicated that the correlation was mediated through ovulation rate, and that it was not limited to the Finnish Landrace.

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