Abstract
Abstract When Romney ewe hoggets were fed at three levels of winter nutrition and subsequently fed at two levels during spring-summer, between 60 and 133% of the winter weight differences were recovered during spring-summer. Regression analysis showed that 83% of the variation in the twinning rate at first lambing was accounted for by live weight at mating. Every 10 kg increase in mating weight was associated with a 16% increase in twinning rate. Level of winter feeding at the hogget stage had no effect on reproductive performance at first lambing, but spring-summer nutrition was of great importance in determining mating weight and hence the proportion of twins born. The high-plane winter feeding of Romney hoggets is not justified, providing feed is not limiting during the following spring and summer.
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