Page 950 - The Veterinary Care of the Horse

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Figure 19.24 An udder 24 hours before foaling

These signs should not be taken as a reliable indication that foaling is imminent. Some
mares show very little change until the last few hours while others run milk for days or

weeks before foaling.

CHANGE IN MAMMARY SECRETIONS
The composition of the mammary secretions changes as the mare approaches parturition

(foaling). If there is a particular need to know when foaling is imminent, the secretions can
be tested. Milk strip test kits are available for measuring the electrolyte concentrations in the

mammary secretions and may provide a guide to the maturity of the foetus and its readiness
for birth.

VULVAL RELAXATION

Shortly before birth, the vulva lengthens and appears slightly swollen (Figure 19.25).