1. Spicer LJ, Zavy MT. Concentrations of insulin-like growth factor-I in serum of sheep with different ovulation rates: changes during the estrous cycle. Theriogenology 1992; 37: 395-405.
2. Spicer LJ, Hanrahan JP, Zavy MT, Enright WJ. Relationship between ovulation rate and concentrations of insulin-like growth factor-I in plasma during the oestrous cycle in various genotypes of sheep. J Reprod Fertil 1993; 97: 403-409.