POST-PARTUM OVULATION AND OESTRUS IN SPRING-LAMBING EWES

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Abstract
By means of ovarian examination and teasing with vasectomized rams, the intervals of 1st post-partum ovulation and estrus were determined in a 23-factorial experiment with 24 German Merino ewes which lambed between 28th Oct. and 15th Nov. 1966. First ovulation occurred 32.1[plus or minus]1.9 (8 to 45) days after lambing. Three, 15 and 6 ewes had none7one or more than 3 silent ovulations respectively, before showing heat after a mean interval from lambing for all ewes of 57.1[plus or minus]4.5 days. The regression of post-partum interval to ovulation (Y) on ewe''s weight 3 days post partum (X) was significant (P< 0.01); for ewes weighing 83 to 162 lb, Y = 55.15- 021 X. The regression of post-partum interval to estrus on ewe''s weight was not significant, and neither were the effects of treatments, namely, weaning at 3 or 20 days post partum, supplementary feeding of 0 or 1 lb maize grain daily from 3 to 28 days post partum, and joining with vasectomized rams at 3 or 14 days post partum.

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