The importance of this indoleamine
has been showed by the presence of its receptors in
reproductive organs [124]. Recently, it was reported that
the treatment under HS of dairy cows with melatonin implants
before calving reduced subsequent days open and
662 F. De Rensis et al. / Theriogenology 84 (2015) 659–666
incidence of cows requiring four or more AI to become
pregnant [125] and has beneficial effect on blastocyst
in vitro production from heat-stressed bovine oocytes
[126].