The relationship between breed and litter size in sheep and maternal serum concentrations of placental lactogen, estradiol and progesterone.

@article{Butler1981TheRB,
  title={The relationship between breed and litter size in sheep and maternal serum concentrations of placental lactogen, estradiol and progesterone.},
  author={W. Ronald Butler and S M Fullenkamp and Luigi Cappiello and S A Handwerger},
  journal={Journal of animal science},
  year={1981},
  volume={53 4},
  pages={1077-81}
}
Milk production in sheep is known to be affected by breed and litter size. To investigate a possible hormonal basis for such effects, we measured maternal serum concentrations of placental lactogen, estradiol and progesterone during late gestation in sheep of several breeds and ages. Circulating concentrations of placental lactogen were directly related to litter size in all breeds, with the greatest concentrations being observed in Finnish Landrace ewes bearing three lambs. Among monotocous… CONTINUE READING

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