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  • Title: Progestogen concentration and ionic composition of the mammary secretion of periparturient bitches.
    Author: England GC, Verstegen JP.
    Journal: J Reprod Fertil Suppl; 1997; 51():209-14. PubMed ID: 9404287.
    Abstract:
    Mammary secretions were collected from nine bitches of various breeds during the periparturient period. Initial mean progestogen concentrations were high and started to decline from 5 days before parturition, in a similar way to changes in plasma progesterone concentration. Values were basal by 3-4 days after parturition. Marked individual and day variations prevented this method from reliably indicating the time of impending parturition. Calcium concentrations in milk increased from 3-5 days after parturition, whereas a decline in magnesium concentration was noted from day 1 postpartum. There was an increase in the Ca:Mg ratio from 1 day after parturition, although this was not significant until day 3, and was therefore not useful for predicting impending parturition. There were no significant changes in sodium concentration in milk.
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