Letting you bitch wander (or even taking her out in public) when she is in oestrus frequently results in unwanted puppies. (psychologytoday.com)
One of the AIR investigators was searching the medical research listing Medline for articles by one C.E.Graham, an expert in chimpanzee oestrus cycle endocrinology. (newscientist.com)
It is believed to take the stress off any male animals when the female oestrus odour is «masked». (lowchensaustralia.com)