How split-sexing at a lower weight supports higher pig welfare

I’d like to take this opportunity to share a bit more about why this update is so important, and how your efforts are supporting even higher welfare for your pigs.

Why the change?

Since 2016, the RSPCA’s standards have required split-sex rearing for pigs weighing more than 110kg. However, because most pigs in the UK aren’t reared to this weight , there were concerns that only a very few pigs were benefiting.

By lowering the threshold to 50kg, it applies to more pigs and we are minimising the risk of sexual activity between pigs before separation, creating a less stressful and aggressive environment for female pigs.

Grounded in science

It’s important to us that every update we make to our standards is backed by scientific evidence and industry consultation. Our research included European Food Safety Authority (EFSA) findings on pregnant gilts being sent to slaughter where pigs are finished in mixed-sex groups, as well as specific studies looking into the direct benefits to pig welfare.

Benefits of split-sexing

Research shows that rearing pigs in single-sex groups offers significant advantages, especially for females. These include:

• Reduced mounting
• Reduced injuries
• Reduced lesions
• Improved growth from sex-specific diets
• Significantly reduced likelihood of the slaughter of pregnant pigs.

A collaborative success

Like all of the RSPCA welfare standards, we didn’t make this decision alone. In 2025, more than 60% of RSPCA Assured producers were already voluntarily practising split-sexing across all systems. They reported that it wasn’t just better for welfare and health, but was also economically practical to put in place.

During consultations, 50kg was recommended as an appropriate weight by members of the RSPCA’s pig standards technical advisory group (STAG), which includes representatives from a range of producer groups across the pig industry.

Leading the way for pig welfare

While we know that split-sexing doesn’t eliminate all aggression and sexual activity, it’s a huge step forward in protecting the welfare of female pigs.

We appreciate the commitment you have already shown in meeting the RSPCA’s science-led standards, and we’re proud that RSPCA Assured members will be making an even bigger contribution to pig welfare going forward, leading the way in higher welfare British farming.

We’re grateful for your continued care and dedication. Your efforts make a real difference to your animals every single day.

If you have any concerns or questions about the benefits of split-sexing, please don’t hesitate to get in touch.