In the first 11 days of pregnancy, progesterone and prolactin levels were significantly correlated (P<0.05), positively in December-mated animals (r=0.889) and negatively in those mated in March (r equals -0.865).
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Rhind, S. M., Chesworth, J. M., & Robinson, J. J. (1978). A seasonal difference in ovine peripheral plasma prolactin and progesterone concentrations in early pregnancy and in the relationship between the two hormones. Journal of Reproduction and Fertility, 52(1), 79–81. https://doi.org/10.1530/jrf.0.0520079