01089naa a2200241 a 450000100080000000500110000800800410001910000200006024500590008026000090013952004590014865000200060765000200062765000140064765000170066165000100067865300110068865300200069970000130071970000180073270000160075077300810076620729992017-07-21       1972    bl uuuu     u00u1 u    #d1 aBRADFORD, G. E.  aGenetic control of the duration of gestation in sheep.  c1972  aResults of egg transfer and of reciprocal crossing among breeds of sheep with a range of 1 week in mean gestation period indicate that the genotype of the fetus is the major determinant of the duration of gestation, over a range of litter sizes from 1 to 5 and a wide range of combinations of size of donor and recipient breeds. It is concluded that the fetus accounts for at least two-thirds of the genetic variation in gestation period in this species.  aAnimal genetics  aMultiple births  aPregnancy  aReproduction  aSheep  aFoetus  aGenetic control1 aHART, R.1 aQUIRKE, J. F.1 aLAND, R. B.  tJournal of Reproduction and Developmentgv. 30, n. 3, p. 459-463, Sep. 1972.