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A flock of 285 Boarder Leicester x Merino ewes was allotted to two groups. For one month, one group was grazed on a high plane of nutrition and the other on a low plane. The nutrition of the groups was then inter-changed and mating commenced 10 days later. One group was decreasing in liveweight and the other increasing in liveweight throughout the mating period. In the two groups, the mean liveweights of ewes at the time each ewe first mated, were similar. Approximately half of the ewes of eachdoi:10.1530/jrf.0.0280148-a fatcat:slyq7ahye5dlhc2pyoj7lfayf4