Assertion: relaxin's level | /r/CapableOf | increase in dog
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text: The levels of prolactin--a hormone produced by the pituitary gland, responsible for the stimulation of the mammary gland and lactation--tend to increase from day 30 to day 35 of a pregnancy until term is reached, according to Patrick W. Concannon, PhD. Increased levels of prolactin, though, are not reliable indicators of canine pregnancy since such levels tend to increase as well in dogs suffering from a false pregnancy.