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Effects of Combining Protein Sources on Lysine Utilization by Starter Pigs¹

The Ohio State University and The Ohio Agricultural Research and Development Center, Columbus 43210

Abstract

The effect of combining protein sources on lysine utilization was evaluated using 450 crossbred starter pigs, average initial weight 6.8 kg and final weight 17.4 kg, in four replicates of 12 dietary treatments. Pigs were fed ad libitum a corn-soybean meal basal diet containing .65% total lysine, supplemented with one of four lysine sources: L-lysine·HCl, soybean meal, meat and bone meal and a combination of meat and bone meal and soybean meal with each providing equal lysine. The levels of supplemental lysine added to the basal diet by addition of the lysine sources were: 0, .15 and .30% L-lysine·HCl and .10, .20 and .30% for soybean meal, meat and bone meal and combination. All diets were calculated to meet or exceed the National Research Council recommendations for amino acids other than lysine. Gain and feed intake were measured over the treatment period. There was an effect (P<.05) due to treatment on both average daily gain and gain/feed, but no effect calculated due to the independent variable of lysine intake for each of the lysine sources tested and the dependent variable of average daily gain or gain/feed. Response to the supplemental protein sources was linear. Gain and gain/feed were maximized when soybean meal fortified the basal diet. The data indicate that in weanling pigs to 17 kg body weight, lysine utilization from protein sources is not seriously affected by feeding the source in combination. This result is in agreement with previous research with growing pigs, which suggests that published estimates of lysine availability will allow formulation of diets to an available lysine requirement regardless of whether the protein source is fed alone or in combination.

¹ Salaries and research support provided by State and Federal Funds appropriated to the Ohio Agr. Res. and Dev. Center, The Ohio State Univ. Journal Article No. 215-82.

² Dept. of Anim. Sci., The Ohio State Univ., Columbus 43210.

³ Central Soya Co., Inc., Decatur, IN 46733.

⁴ Dept. of Anim. Sci., The Ohio Agr. Res. and Dev. Center, Wooster 44691.