Swine Carcass Contest: Loin Depth, Backfat, and What the Numbers Mean
Pork is priced on lean yield, so loin depth and backfat tell the story.
Swine carcass contests emphasize lean pork. A few measurements explain most of the results.
Loin eye area and depth
The loin eye, measured in square inches, and loin muscle depth show muscle. More muscle relative to carcass weight signals a leaner, higher-yielding hog.
Backfat
Backfat is measured over the last rib or at the tenth rib. Lower backfat generally means higher lean percentage, but extremely thin fat can hurt quality.
Carcass weight
Hot carcass weight and dressing percentage show how much of the live weight became carcass.
Percent lean
Many contests compute percent lean or fat-free lean index from weight, backfat and loin measurements. Higher is better.
Meat quality
Some contests record pH, color, marbling and firmness. These indicate pork quality and consumer appeal.
What drives results
Genetics drive loin size and fat level. Feeding, health and handling affect finish and quality.
Pre-harvest handling
Stress can cause pale, soft meat. Handle calmly and avoid overheating.
Reading your sheet
Compare numbers with the contest average. Note areas that need improvement.
Using results
Select pigs with muscle and leanness, and adjust feeding duration.
Common mistakes
- Overfeeding
- Ignoring stress
- Choosing only on looks
The takeaway
Loin size, backfat and weight tell the story. Aim for muscle with moderate finish.
For related reading, see How Carcass Contests Work. agriculture.directory lists feed stores, vets and suppliers near you, and for a lighter break from fair prep, farm.fm has USDA Funds Meatpacking.