Effect of Sulfur Supplementation on in Vitro Cellulose Digestion and on Nutrient Utilization and Nitrogen Metabolism of Lambs Fed Various Forages
Guardiola, Carmen Fernandez
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https://hdl.handle.net/2142/70001
Description
Title
Effect of Sulfur Supplementation on in Vitro Cellulose Digestion and on Nutrient Utilization and Nitrogen Metabolism of Lambs Fed Various Forages
Author(s)
Guardiola, Carmen Fernandez
Issue Date
1982
Department of Study
Animal Sciences
Discipline
Animal Sciences
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Animal Culture and Nutrition
Abstract
Experiments were conducted to determine the effects of supplementing three different forages (low quality tall fescue hay, good quality tall fescue hay and tropical star grass hay) containing .26% S, .25% S and .20% S respectively with an isofulfurous quantity of either sodium sulfate or DL methionine.
The addition of 1% urea to low quality fescue, good quality fescue and star grass hay stimulated in vitro cellulose digestion. Supplementation of these three forages with .05, .10 or .15% from either sodium sulfate or DL methionine also stimulated cellulose digestion (P < .05). There were no differences between S source.
In vivo experiments involved the use of twelve crossbred lambs (av. wt. of 34, 26 and 28 kg for the low quality fescue, good quality fescue and star grass experiments) which were randomly assigned to one of three treatments: forage, with no added S, forage with .15% S as sodium sulfate and forage with .15% S as DL methionine. After completion of trial one, lambs were rerandomized and the trial was replicated. Acid Detergent Fiber (ADF) and Neutral Detergent Fiber (NDF) digestibilities were improved (P < .01) by S supplementation to low quality fescue regardless of sulfur source. N retention was not significantly affected by treatment. Essential amino acids (% of total) were higher (P < .01) for lambs receiving .15% sulfate-S diet. Molar % of methionine was increased (P < .01) by the addition of S whereas phenylalanine and glycine concentrations decreased with sulfur addition. Serum taken from lambs fed .15% methionine-S contained more histidien (P < .05) while lambs fed .15% sulfate-S had less serum glycine.
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