01764naa a2200301 a 450000100080000000500110000800800410001910000170006024500910007726000090016852009090017765000220108665000170110865000170112565000290114265000100117165000280118165000160120965000210122565000230124665000100126965000240127965000250130365300140132865300220134270000190136477300790138320625182017-02-02       1981    bl uuuu     u00u1 u    #d1 aTOMAR, S. S.  aGenetic variations in the fertility of exotic sheep under subtemperate indian climate.  c1981  aThe fertility level of 3 breeds of exotic sheep i.e., Rambouillet, Romney Marsh and South Down, is reported. The lambing percent did not differ significantly among the 3 breeds (varying from 71.7% in Romney to 86.6% in South Down) and was comparable with that of local (Gaddi) breed (75%). About 50-60% of the ewes in the flock (of all the 3 breeds) lambed once during a year and the remaining 40-50% ewes remained barren. On an average, 1.5 services were required for successful conception for all the 3 breeds. In the 1st estrus 61, 65 and 73% ewes of Romney Marsh, Rambouillet and South Down, respectively, conceived and lambed to 1st service, and a further 11, 13 and 10% of ewes, respectively, conceived to service in the 2nd estrus. The repeatability of the lambing percent was negative and low in Rambouillet (-4.1) and South Down (-11.7), but it was positive and moderate (30.7%) in Romney Marsh.  aGenetic variation  aLambing rate  aReproduction  aReproductive performance  aSheep  aEficiência reprodutiva  aFertilidade  aGenética animal  aIntervalo de parto  aOvino  aReprodução animal  aVariação genética  aFertility  aTaxa de parição1 aMAHAJAN, J. M.  tThe Indian Journal of Animal Sciencesgv. 51, n. 6, p. 627-629, Jun. 1981.