Anytime a male and a female are together, it is a breeding situation.
I like the way you put that:
or is it usual the male who does the work of romancing?
I guess the men consider it work, but find it rewarding. A male chin will do the "Swish, Swish Tail" dance for days until the female is in full season and will accept his advances ... guess that's why he only takes about 15 seconds to get her pregnant ... he's to tired from pleading with her for days.
Jo Ann
P.S. They give birth year round, but most big ranchers prefer to have the kits born about the same time each year, so they do not put them together until a specific time that is convenient for their purposes/schedules. Most do it at the same times of the year. When you have herds of between 1,000 and 4,000, it is best to 'schedule' the times of delivery as close to one another as possible.