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Reevaluation of the Isoleucine Requirement of the Young Pig¹

University of Minnesota, St. Paul 55101

Abstract

Yorkshire barrows averaging 5.8 kg initially and about 3 weeks of age, were fed a 14.4% protein diet containing adequate, but not excessive amounts of amino acids other than isoleucine to reevaluate the requirement of young pigs for isoleucine. Means for average daily gain (ADG), gain/feed (G/F), protein efficiency ratio (PER) and plasma free isoleucine (PFI) differed significantly (P<.01) due to level of dietary isoleucine. Level of dietary isoleucine also exerted significant (P<.01) linear and quadratic effects on ADG, G/F, PER and PFI. Levels of PFI were significantly (P<.01) affected by day of sampling, i.e., day 10 vs. 20 vs. 31, and it appeared that pigs may not have adjusted satisfactorily by day 10 to permit use of day 10 PFI values in predicting the dietary isoleucine need. Predicted needs for dietary isoleucine based on ADG, G/F and PER, respectively, were 0.52, 0.48 and 0.45%. Predicted requirements based on PFI on days 10, 20, and 31 were 0.38, 0.44 and 0.38%, respectively.

¹ Paper 7997 Scientific Journal Series of the Minnesota Agricultural Experiment Station.

² Present address: Forschungsanstalt fur Landwirtschaft, Bundes Allee 50, 3301 Braunschweig, W. Germany.