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Journal of Animal Science Abstract -

Digestibility and Feeding Value of Peanut Hulls for Swine


This article in JAS

  1. Vol. 62 No. 2, p. 412-421
    Received: Jan 25, 1985
    Accepted: Sept 27, 1985


  1. M. D. Lindemann,
  2. E. T. Kornegay and
  3. R. J. Moore
  1. Virginia Polytechnic Institute and State University1, 2, Blacksburg 24061



Twenty-four crossbred gilts averaging 72 ± .7 kg were used in two balance trials to determine the digestibility of various nutrient components of peanut hulls. The peanut hulls analyzed (%): nitrogen, 1.44; neutral detergent fiber, 63.6; acid detergent fiber 56.3; cellulose, 45.5; hemi-cellulose, 7.5 and lignin, 7.7. They contained .24% Ca, .09% P, .09% Mg, .25% K, 295 ppm Fe, 48 ppm Na, 34 ppm Mn, 24 ppm Zn and 14 ppm Cu. The gross energy of the hulls was 4,380 kcal/kg. As peanut hulls were substituted for the basal diet (7.5, 15 or 30%) digestion coefficients for dry matter, nitrogen, energy, neutral detergent fiber, lignin, hemicellulose and ash were decreased (P<.001). Net retention of Ca, P, Na, Mn and Zn was reduced (P<.02) with increasing levels of peanut hulls. Reductions in Na, Mn and Zn retentions were evident, however, only when peanut hulls exceeded 7.5% of the diet. The estimated digestibilities of the components of peanut hulls, calculated by regression utilizing the percentage of each component in the total diet supplied by peanut hulls, were (%): dry matter, 28.8; nitrogen, 29.6; energy, 32.5; neutral detergent fiber, 14.9; acid detergent fiber, 16.4; lignin, 19.8; cellulose, 19.5 and hemicellulose, .0. Two feeding trials, utilizing 120 crossbred pigs, were conducted to evaluate the effects of peanut hulls on growth performance of swine. Peanut hulls were added at 0, 7.5, 15.0 and 22.5% to a 14.8% crude protein corn-soybean meal grower diet (29 to 60 kg) and a 13.8% crude protein finisher diet (60 to 99 kg). There were no differences (P>.05) in daily gain during either period of the trials due to the addition of peanut hulls to the diet. The maintenance of similar gains was accomplished by linear increases in daily feed intake during both the growing (P<.05) and finishing period (P<.001). Both the unground and ground peanut hulls flowed poorly and were difficult to handle with conventional equipment.

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Copyright © 1986. American Society of Animal ScienceCopyright 1986 by American Society of Animal Science