Changes in mammary development and composition of secretion during late pregnancy in the mare.

The research article explores the changes in mammary development and composition in pregnant thoroughbred mares during the final three weeks of pregnancy. The study suggests the concentration of calcium in mammary secretion can be used to predict imminent childbirth in the species.

Research Objectives and Methodology

• The researchers aimed to study alterations in the mammary glands and substance composition of pregnant Thoroughbred mares during the last phase of their pregnancy until foaling. The goal was to identify any distinct patterns or changes that could potentially predict the onset of parturition, or childbirth.
• In order reliably trace these developmental changes, the researchers took small samples of the mammary secretion from these mares for analysis.

Observations

• The research identified varying concentrations of different components in the mammary secretion throughout the studied period. Specifically, a decrease in sodium and chloride was observed, while the presence of lactose, potassium, citrate, phosphate, calcium, magnesium, and protein increased.
• The researchers noted that the timeline of these changes showed substantial variation between individual mares.
• A significant change in the concentration of whey proteins, which started to increase around 10 days before parturition, was also noted.
• The findings also highlighted an increase in the size of the mammary glands and alteration in the appearance of the secretion during the final days of pregnancy.

Conclusions and Suggestions

• Based on the observations, the researchers suggested that the increasing concentration of calcium in mammary secretion during the final stages of pregnancy could potentially serve as an indicator of impending parturition in mares.
• This evidence could contribute to developing a test that could predict upcoming childbirth for mares, providing significant implications for their healthcare and birthing oversight.