Relationship of Plasma Lipid Levels to Carcass Quality and Rate of Gain in Swine

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Abstract
When pigs were not fasted prior to bleeding, there was a significant correlation between plasma lipid levels taken at 100 lb. in weight and average backfat thickness, but no appreciable correlation of plasma lipid levels with loin area or rate of gain. Following a 16- to 18-hour fasting period prior to bleeding so that the pigs were allowed to approach a post-absorptive state, there were significant or highly significant correlations of plasma lipids with shoulder fat, back and loin fat, combined shoulder, back and loin fat, and area of loin muscle, while plasma lipid correlations with average daily gain approached significance at the 5% level. A correlation of .70 was found between plasma lipids taken from individuals at 100 lb. and at 200 lb. liveweight. The results indicate that plasma lipid levels taken from pigs weighing approximately 100 lb. would be of some use to supplement other measures in estimating fat and lean content of pig carcasses at market weight. In individual fasted pigs, the relationship of plasma lipids to rate of gain is sufficiently high to indicate some physiological relationship. Copyright © . .

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