Evaluating Breeding Seasonality in the Ewe

The objective of trials reported in this study was to evaluate fall lambing performance of purebred and crossbred ewes in 1989 and 1990. Fall lambing results following hormone treatment were highly variable. Maiden ewes in general did not lamb in the fall. For mature ewes, approximately 80% of the Finn-Dorset x Targhee (FDT) ewes lambed in September compared to 66% for Columbia, 76.5% for Finn-Dorset (FD) and 0.0% for Hampshire ewes. Additional data and statistical analyses are needed before conclusions are drawn