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Journal of Animal Science, Vol 72, Issue 5 1247-1256, Copyright © 1994 by American Society of Animal Science

JOURNAL ARTICLE

The effects of lysine:energy ratio on the performance of weanling pigs

D. S. Nam and F. X. Aherne
Department of Animal Science, University of Alberta, Canada.

In five trials, 382 weaned pigs with an average BW of 9.1 +/- .07 kg were randomly allotted in groups of four to determine the optimum ratio of lysine:energy and the interrelationship between lysine and DE levels. Twelve dietary treatments, three levels of DE (13.3, 14.0, and 14.7 MJ of DE/kg), and four lysine:energy ratios (Lys:DE) of .7, .8, .9, and 1.0 g of lysine/MJ of DE were used in a 3 x 4 factorial arrangement. All diets were formulated to have similar CP levels (19.5%) and were based on wheat, barley, and soybean meal. There was a linear decrease (P < .05) in feed intake as the energy in the diet increased. Feed intake was not affected by Lys:DE. A positive linear effect (P < .001) of Lys:DE on ADG was observed. Also, ADG increased linearly (P < .05) with an increase in DE level. Increases in DE level and Lys:DE resulted in linear (P < .001) improvements in gain to feed. Plasma urea nitrogen (PUN) concentrations decreased (linear, P < .001; quadratic, P < .007) as Lys:DE increased up to .9 g of lysine/MJ of DE. As the level of DE increased, there was a linear decrease in PUN concentration (P < .001). Backfat thickness of pigs increased linearly (P < .003) with an increase in DE level. Ratio of lysine:DE had a quadratic (P < .002) effect on backfat thickness, with an increase up to .9 g of lysine/MJ of DE and a decrease thereafter. The combination of DE level and Lys:DE, based on response surface analysis, that produced maximization of weight gain (612 g/d) was 14.13 MJ of DE/kg and .95 g of lysine/MJ of DE for pigs from 9.1 to 25.7 kg of BW.


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Copyright © 1994 by the American Society of Animal Science.