01008naa a2200289 a 450000100080000000500110000800800410001902400630006010000170012324500990014026000090023952002170024865000160046565000130048165000110049465000100050565000140051565000100052965000100053965000170054965000100056665300190057665300170059570000180061270000220063077300660065215202702025-07-16       1968    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1093/oxfordjournals.jhered.a1077112DOI1 aVAKIL, D. V.  aInfluence of hereditary and environmental factors on twinning in sheep.h[electronic resource]  c1968  aThe purpose of the present study was to investigate the environmental and hereditary causes of variation in the frequency of twin births in the sheep flock maintained at the Wyoming Experiment Station at Laramie.  aEnvironment  aGenetics  aHumans  aMales  aPregnancy  aSheep  aTwins  aMelhoramento  aOvino  aFator genetico  aMaternal Age1 aBOTKIN, M. P.1 aROEHRKASSE, G. P.  tJournal of Hereditygv. 59, n. 4, p. 256-259, Jul./Aug. 1968.