Why pigs in some poorly-managed units have overfat carcases. - Leaving Cert Agricultural Science - Question e - 2013

The ingredients used in the feed might not be of good quality, leading to insufficient nutrition. This could result in an imbalanced diet that fails to meet the pigs' amino acid requirements.

Due to the lack of protein, pigs tend to increase their intake of carbohydrates. This excess energy is then converted into fat, resulting in overfat carcases.

The conversion efficiency of feed (FCE) may be poorer in these pigs. They may not effectively utilize the energy from their diet, leading to increased fat deposition instead of muscle growth.

Older pigs are generally more likely to accumulate fat compared to younger ones. Additionally, if feeding levels are not appropriately monitored or reduced before slaughter, it can contribute further to weight gain in the form of fat rather than lean tissue.

Finally, poor breed selection can also play a role, as certain breeds may naturally tend to put on fat more readily than others, especially under suboptimal management conditions.