Abstract
In Iceland, the sheep production year is characterized by lambing in May, weaning and slaughtering in September and October. Our hypothesis is that modelling interrelationships of production parameters will aid in controlling variation in important outputs like weaning weight. We analyzed data from twelve production years in our experimental farm with total records of 9661lambs born to 1847 dams. In the whole dataset, 7.4 % of the lambs were born as singles, 78.1 % as twins, 13.7 % as triplets and 0.8 % as quads. Surrogate mothers fostered 5.5 % of the lambs.
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