Sow longevity is one of the most important, yet sometimes overlooked, factors affecting farm profitability. As genetics, nutrition and housing systems have developed dramatically over the past few decades, herds should continue to invest in keeping sows productive for as long as possible.
Every time a sow leaves the herd early, she must be replaced by a gilt that has not yet paid back the cost of rearing. From a financial perspective, the most profitable sow on the farm is often the one that produces multiple litters over several parities.
Maximising sow longevity is therefore not just a welfare goal – it is a key part of improving herd efficiency.
A gilt entering the breeding herd represents a significant investment. Between rearing costs, feed, housing and labour, it may take two or three litters before she begins to generate a positive return. If a sow is culled after only one or two parities, that investment is rarely recovered.
The target is for sows to produce at least five or six litters before leaving the herd. Achieving this requires careful management throughout the sow’s lifetime, starting even before her first service.
Gilt development
Longevity begins with good gilt development. Gilts that are bred too young or too light are more likely to experience reproductive or structural problems later in life.
Ensuring gilts reach the correct weight and maturity before first service is essential. Equally important is acclimatisation to the herd’s health status, whether you are buying in or home breeding your gilts.
Controlled exposure under veterinary guidelines can help build immunity before gilts enter the breeding herd. A well-managed gilt development programme lays the foundation for a long, productive life.
One of the most common reasons sows leave the herd early is poor body condition. During lactation, sows can lose significant weight while rearing large litters. If feed intake is under target or environmental conditions are challenging, this weight loss can be excessive.
Sows that lose excessive weight in lactation are often slow (or fail) to return to oestrus after weaning and may experience fertility problems or underperform in subsequent cycles.
Maintaining optimal body condition through appropriate feeding strategies during gestation and lactation is therefore critical.
Regular body condition scoring, alongside veterinary and nutritionist support, can help ensure sows remain within the ideal range.
Another major cause of early culling is lameness. Foot lesions, joint problems and structural weakness can all reduce a sow’s ability to stand, walk and rear large litters of piglets. Housing plays an important role here.
A focus on flooring, avoiding slippery surfaces and ensuring adequate bedding all reduce the risk of injury. Selecting replacement gilts with good leg conformation and maintaining comfortable flooring conditions can significantly improve sow longevity.
Disease pressure
Disease pressure can also shorten the productive life of a sow. Reproductive infections, respiratory disease and systemic illness can all affect fertility and overall health.
Effective vaccination programmes help reduce the effect of important pathogens, such as porcine parvovirus and porcine reproductive and respiratory syndrome virus.
Good biosecurity, consistent herd health monitoring and robust vaccination programmes are all essential to maintain good reproductive performance.
Perhaps one of the most underrated factors affecting sow longevity is stockmanship. Experienced stockpeople can often detect subtle changes in behaviour, appetite or mobility long before problems become severe.
Early intervention – whether adjusting feed levels, treating minor injuries or managing environmental conditions – can prevent small issues from becoming reasons for culling.
Improving sow longevity rarely depends on a single change. Instead, it requires attention to multiple aspects of herd management: gilt development, nutrition, housing, health programmes and daily care.
Even small improvements in these areas can have a significant effect over time. When sows remain healthy, productive and structurally sound for several parities, it usually indicates that nutrition, housing and health management are working together effectively.
Keeping sows productive for longer is not simply about reducing culling rates – it is about making the most of the investment made in every gilt that enters the herd. And when those sows remain in the herd for multiple productive years, both farm performance and animal welfare benefit.
When gilts are managed well from the start and sows are supported throughout their productive life, the benefits can be seen across the whole system – improved performance, reduced replacement costs, stronger welfare outcomes and greater long-term herd stability.