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Title:The Utilization of Dietary Fiber and Its Effects on The Utilization of Other Dietary Components by Swine
Author(s):Frank, George Robert
Department / Program:Animal Science
Discipline:Animal Science
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Agriculture, Animal Culture and Nutrition
Abstract:The utilization of dietary fiber and its effects on the utilization of dietary dry matter (DM), nitrogen (N), neutral detergent fiber (NDF), acid detergent fiber (ADF), hemicellulose (H) and digestible energy (DE) by growing swine. For weanling pigs, fecal N excretion was increased and N retention was decreased by the addition of either of three commercial cellulose products to a 15% cornstarch-casein diet. Cellulose additions to a 9% CP cornstarch-casein diet had no significant effect on N excretion or retention. Pigs fed the 9% CP diets digested only half as much NDF as pigs fed the 15% CP diets. These results suggest a relationship between the level of dietary CP and the extent of fiber digestion which also influences the fecal N excretion of weanling pigs.
A feeding trial was conducted to evaluate the effects of three levels of dietary fiber on pig performance. Average daily gain and gain/feed ratio were decreased while average daily feed intake was increased with increasing fiber levels. Average daily DE intake tended to decrease with increasing fiber levels suggesting that pig performance was depressed due to the inability of pigs fed the fiber diets to maintain similar DE intakes. Pigs were selected on the basis of average daily gain to represent pigs of above average, average, and below average performance within each level of dietary fiber. A digestion trial was conducted to determine if the previous performance of these pigs could be related to the digestibilities of dietary components. Dietary DE and the digestibilities of DM, N, NDF and ADF were decreased with increasing fiber levels. Regardless of diet, no significant differences in any of these criteria were observed among pigs of different previous performance.
Growing pigs were fed a corn-soybean meal diet to evaluate the effects of supplemental intakes of either 0, 7.5 or 15 g corn cobs/100 g basal diet on the digestibilities of the major dietary components relative to the concentrations of glucose, ammonia, urea and VFAs in portal and vena cava plasma. The digestibilities of total dietary DM, N, NDF, ADF and H were decreased with increasing intakes of corn cobs due to the poor digestibilities of these components contributed by corn cobs. Although pigs consuming corn cobs digested about 20 g more NDF per day than did the control pigs, the concentrations of VFAs in the portal plasma were similar regardless of treatment. These results indicate tht the VFAs produced in and absorbed from the hindgut as much as an estimated 18-20% of the maintenance net energy requirement of growing pigs fed corn-soybean meal diets.
Issue Date:1982
Type:Text
Description:126 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982.
URI:http://hdl.handle.net/2142/70000
Other Identifier(s):(UMI)AAI8302860
Date Available in IDEALS:2014-12-15
Date Deposited:1982


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