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Soybean Meat-Swine Two experiments were conducted at the University of Nebraska
evaluating performance and nutrient digestibilities of pigs fed a corn-soybean
diet or a low-protein diet. The low-protein diets were supplemented
with crystalline lysine, threonine, tryptophan, and methionine to an
ideal protein basis or to levels similar to the corn-soybean meal diet.
Results of this study indicated that barrows with genetic potential
for high-lean gain and fed low-protein, amino acid-supplemented diets
had lower growth performance than barrows fed the corn-soybean meal
control diet, regardless of feeding rate. Extensive evaluations of body
composition and tissue accretion rates of the pigs on test were conducted
and results indicated the pigs fed the amino acid supplemented diets
had less protein in their body and lower protein accretion rates than
the pigs fed the control diet. The researchers concluded that reducing
the dietary protein content of the diet by four percent resulted in
a deficiency of one or more essential amino acids and possibly of other
nutrients. The researchers postulate that maybe imbalances of net energy
available for production and increased energy to amino acid levels could
cause metabolic imbalances that would result in increases in adipose
tissue deposition and relative low levels of protein. Note: While
formulating rations with reduced protein levels for environmental purposes
may have merit, the swine nutritionist must take care to assure that
all nutritional requirements of the pig are met for satisfactory performance.
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