00975naa a2200217 a 450000100080000000500110000800800410001910000170006024500590007726000090013652003890014565000090053465000290054365000100057265300140058270000150059670000200061170000180063170000210064977300870067020922922018-06-07       1981    bl uuuu     u00u1 u    #d1 aSMITH, J. F.  aIncreasing the ovulation rate in ewes by immunisation.  c1981  aThe immunisation of Coopworth and Romney ewes against androstenedione and oestrone increased their ovulation rate by up to 30% and in the case of the oestrone group this was reflected in a 27% increase in the number of lambs weaned. The response to immunisation was additive to that obtained by increased pre-grazing herbage allowance for 6 weeks premating and to that between breeds.  aEwes  aReproductive performance  aSheep  aAnoestrus1 aCOX, R. I.1 aMcGOWANT, L. T.1 aWILSON, P. A.1 aHOSKINSON, R. M.  tProceedings of the New Zealand Society of Animal Productiongv. 41, 193-197, 1981.