Diestrus was characterized by an
increase in plasmatic P4, that reaches a plateau at Day 6 to
11 (spring, summer, and autumn) or Day 12 (winter), then
decreased until values below 2 ng/mL at the beginning of
the following estrus. The heat behavior could be easily
evocable by jackass teasing and was characterized by unequivocal
signs, different to those reported in the mare. The
jennies seemed to ovulate follicles with similar size and
characteristics in the four seasons of the year, thus the
criteria used for ovulation monitoring could be the same
during the whole year