Effects of adding fiber sources to reduced-crude protein, amino acid-supplemented diets on nitrogen excretion, growth performance, and carcass traits of finishing pigs

Two experiments were conducted to evaluate the effects of adding fiber sources to reduced-crude protein (CP), amino acid-supplemented diets on N excretion, growth performance, and carcass traits of growing-finishing pigs. In Exp. 1, six sets of four littermate barrows (initial weight = 36.3 kg) were...

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Bibliographic Details
Published in:	Journal of animal science Vol. 81; no. 2; pp. 492 - 502
Main Authors:	Shriver, J.A, Carter, S.D, Sutton, A.L, Richert, B.T, Senne, B.W, Pettey, L.A
Format:	Journal Article
Language:	English
Published:	Savoy, IL Am Soc Animal Sci 01-02-2003 American Society of Animal Science
Subjects:	Amino Acids - administration & dosage Amino Acids - pharmacology ammonium nitrogen Animal Feed Animal Nutritional Physiological Phenomena Animal productions Animals barrows beet pulp Biological and medical sciences body weight carcass characteristics crude protein Dietary Fiber - administration & dosage Dietary Fiber - pharmacology Dietary Proteins - administration & dosage Dietary Proteins - pharmacology Dietary Supplements excretion fatty acid composition Fatty Acids, Volatile - analysis feces Feces - chemistry Female finishing Fundamental and applied biological sciences. Psychology growth performance isoleucine low protein diet Male methionine nitrogen Nitrogen - metabolism Nitrogen - urine nutritional intervention Random Allocation slurries soybean hulls Swine - growth & development Swine - metabolism swine feeding Terrestrial animal productions threonine tryptophan urea urine Vertebrates volatile fatty acids Monogastric animal Animal feeding Fiber Supplemented diet Weight gain Carcass Body composition Meat animals Physiology Ungulata Pigs Macronutrient(mineral) Excretion Farming animal Nutrition Nitrogen Experimental study Amino Acids Pig Vertebrata Mammalia Aminoacid Artiodactyla Dietary fiber Crude protein Pig Slurry
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Summary:	Two experiments were conducted to evaluate the effects of adding fiber sources to reduced-crude protein (CP), amino acid-supplemented diets on N excretion, growth performance, and carcass traits of growing-finishing pigs. In Exp. 1, six sets of four littermate barrows (initial weight = 36.3 kg) were allotted randomly to four dietary treatments to determine N balance and slurry composition. Dietary treatments were: 1) fortified corn–soybean meal, control, 2) as fortified corn–soybean meal with CP lowered by 4 percentage units and supplemented with lysine, threonine, methionine, tryptophan, isoleucine, and valine (LPAA), 3) same as Diet 2 plus 10% soybean hulls, and 4) same as Diet 2 with 10% dried beet pulp. Nitrogen intake, absorption, and retention (g/d) were reduced (P < 0.04) in pigs fed the low- protein diets, but they were not affected (P > 0.10) by addition of fiber sources to the LPAA diet. However, N absorption, as a percentage of intake, was not affected (P > 0.10) by dietary treatment. Nitrogen retention, expressed as a percentage of N intake, was increased (P < 0.02) in pigs fed the low-protein diets, but it was not affected by fiber addition to the LPAA diet. Urinary and total N excretion was reduced (P < 0.01) by 50 and 40%, respectively, in pigs fed the low- protein diets, but it was not affected (P > 0.10) by fiber addition. However, fiber addition to the LPAA diet tended to result in a greater proportion of N excreted in the feces than in the urine. Slurry pH, ammonium N content, and urinary urea N excretion were reduced (P < 0.10) in pigs fed LPAA, and a further reduction (P < 0.06) in slurry ammonium N content and urinary urea N was observed with fiber addition. Also, fiber addition to the LPAA diet increased (P < 0.02) slurry VFA concentrations. In Exp. 2, 72 pigs were blocked by body weight and sex and allotted randomly to three dietary treatments that were similar to those in Exp. 1, with a corn–soybean meal control diet, LPAA diet, and a LPAA diet with 10% soybean hulls. Pigs were fed the diets from 28.6 to 115 kg, and all pigs were killed for collection of carcass data. Growth performance and most carcass traits were not affected (P > 0.10) by dietary treatment. These data suggest that reducing CP with amino acid supplementation markedly decreased N excretion without influencing growth performance. Fiber addition to a LPAA diet had little effect on overall N balance or growth performance, but tended to further reduce slurry ammonium N concentration and increase volatile fatty acid concentrations.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0021-8812 1525-3163
DOI:	10.2527/2003.812492x