J. Anim Sci.
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J. Anim Sci. 1978. 46:402-408.
© 1978 American Society of Animal Science
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Utilization of the Energy of Dried Whey and Wheat Middlings by Young Swine1

D. A. Pals and R. C. Ewan

Iowa Agriculture and Home Economics Experiment Station2, Ames 50011

Abstract

Two comparative slaughter experiments were conducted to determine the energy values of dried whey and wheat middlings for young swine. All pigs were fed a basal corn-soy diet (37.7% protein) at a level of 3% of body weight. Dried whey or wheat middlings, fed in addition to the basal diet, improved gains. Feed:gain ratios decreased quadratically with the addition of dried whey, but feed:gain ratio was not affected if wheat middlings were added to the basal diet. Apparent digestibility coefficients (ADC) for dry matter and energy increased, but ADC for nitrogen decreased if dried whey was added. As wheat middlings were added to the basal diet, ADC for dry matter, energy and nitrogen decreased. Energy values of the diets decreased if either dried whey or wheat middlings were added to the basal diet. Average energy values for dried whey and wheat middlings, respectively, were (kilo-calories per gram of dry matter): gross energy, 3.91, 4.55; digestible energy 3.50, 3.47; metabolizable energy, 3.35, 3.34; nitrogen-corrected metabolizable energy, 3.34, 3.29; and net energy, 2.20, .91. The young pig utilizes ME of different feedstuffs with differing efficiencies, as indicated by the lower net energy of wheat middlings when compared with the net energy of dried whey.

Footnotes

1 Journal Paper No. J-8817 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project 2023.

2 Department of Animal Science.






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Copyright © 1978 by the American Society of Animal Science.