Amino Acid Availability Comparisons

Amino Acid Availability Comparisons

Using a growing pig assay, ileal nitrogen and amino acid digestibilities were determined for four commercial samples of rapeseed meal, four soybean meals and nine soybean meals. True ileal digestion of the amino acids was calculated by correcting apparent ileal digestibilities for basal endogenous amino acid losses measured in pigs fed a protein-free diet. The true ileal digestibility values were found as follows:

	Rapeseed Meal	Sunflower Meal	Soybean Meal
Lysine	70.7%	80.%	90.5%
Threonine	73.2	81.8	86.8
Methionine	86.0	91.9	93.0

The true ileal digestibility values were reduced with increases in the relative levels of dietary acid detergent fiber levels to amino acid concentrations in soybean meal. Note: This study supports other studies showing the high relative quality of soybean meal.

Jondrevile, C. and co-workers. 2000. Ideal amino acid digestibility and extimates of endogenous amino acid losses in pigs fed rapeseed meal, sunflower meal and soybean meal. Canadian J. Animal Sci. 80(3):495-506.

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