Female Pig Humping Her Sister

[Alycat]

I think one of my pigs Rosie must be on heat, as she keeps chasing Ruby round and humping her. She's done it about twenty times in the past ten minutes. Poor Ruby keeps squealing at her and trying to get away. I know it's all nature and things, but should I be intervening? Rosie is being a real pest to poor Ruby.
Note: I've never seen Ruby do this to Rosie, but Rosie seems to get this way every few weeks.

I filmed a bit of it so you can see:

 

[Lady Kelly]

to be honest I think it looks like Ruby is being extremely tolerant of Rosie and there seems to be no aggression at all. The squeaks are just communicating and Ruby doesn't look stressed out by it. I would leave well alone, things will calm down as quickly as they started up.

 

[Alycat]

to be honest I think it looks like Ruby is being extremely tolerant of Rosie and there seems to be no aggression at all. The squeaks are just communicating and Ruby doesn't look stressed out by it. I would leave well alone, things will calm down as quickly as they started up.

Cool. She has taken to projectile weeing to try and keep Rosie away. I did move Rosie out for a few minutes lap time to give Ruby a break, but have put her back in now.

 

[sport_billy]

Season times - the joy! We have this issue with Widget and Chickpea.... widget is the top pig and season time humps and chases like no ones business, Chickpea sprays her to make her back off but generally tolerates the overbearing-ness of Widge. Luckily it quietens down within a day or two.

It should quieten down, I know it is horrid to watch but it will sort itself out and sometimes seasons pass without so much as a rumble...

 

[Freela]

Some pigs have more noticeable seasons than others, and some seasons are stronger than others. Your subordinate sow seems to be handling it with good humor. Squeals aren't distress, they are generally submission, as mounting is also a dominance behavior.