I captured about 10 sheep (7 female, 3 male), 8 pigs (6 female, 2 male) and a hen and a rooster ingame between May to June (1 month = 12 days). I fed them until all female sheep had saturation 10 and the sows had saturation level 8. It took me until August until I had enough food. Since then they are all fed and ready to breed. Currently it is end of November, but they don't get pregnant. In the same time I fed my hen, which got pregnant and the first generation of chicken is already grown up by now.
I wonder what I am doing wrong. In another world (in version 1.12.14) I kept male and female sheep and pig separated by a fence and they still got pregnant. In the current world (version 1.13.4) I tried the same, but none of the animals got pregnant. I released at least one male a while ago into the herd of females, but still nothing happens.
My pigs are currently in an underground cellar. My sheep and chickens are in two block deep pits because they glitched out of the fence sometimes.
What are the breeding conditions for animals? Do they need sunlight? Do they need physical contact between males and females? May I keep them separated? Do they only get pregnant in certain seasons? Do I have to keep them above sea level? Do the males also need food (I saw them eat, but they don't get any saturation)?