A seasonal difference in ovine peripheral plasma prolactin and progesterone concentrations in early pregnancy and in the relationship between the two hormones.
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Abstract
In the first 11 days of pregnancy, progesterone and prolactin levels were significantly
correlated (P less than 0.05), positively in December-mated animals (r = 0.889) and
negatively in those mated in March (r = 0.865).