A case of excessive length of pregnanxy in a thoroughbred mare is desc
ribed. A foal was born after 391 days, which was slightly underweight
but otherwise normal. In accordance with VANDEPLASSCHE we recommend no
t interrupt a pregnancy in a mare too early, 340 days should be comple
ted and the udder must show signs of preparedness for lactation, provi
ded there are no other indications for an intervention.