Weather/ climate affects mating season

[momocavies]

Hi I put a boar & 2 sows in the same cage. Yet they aren’t mating, I’m hoping to get some pups. I put them in a semi outdoor cage, and I live in a tropical country. So it tends to be hotter in here. And it also occurs in other cages too. I did separate the boars from the sows for a few weeks & then put them back together but it seems to be no luck. Is there any tips & tricks on how to get them to mate?
Oh and my piggies are over 8 months old

[Bean]

Hi, and welcome to Wheekers, This is a rescue friendly forum (here are the forum guidelines), so we wish you and your pigs well, but hope you will understand that it's not a place to discuss breeding.