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Improving fiber by-product utilizati...

Russell, Jason Ryan.

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Improving fiber by-product utilization in high concentrate diets.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Improving fiber by-product utilization in high concentrate diets./
作者:	Russell, Jason Ryan.
面頁冊數:	104 p.
附註:	Source: Masters Abstracts International, Volume: 52-03.
Contained By:	Masters Abstracts International52-03(E).
標題:	Animal sciences. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1524413
ISBN:	9781303550577

Improving fiber by-product utilization in high concentrate diets.
Russell, Jason Ryan.

Improving fiber by-product utilization in high concentrate diets. - 104 p.

Source: Masters Abstracts International, Volume: 52-03.

Thesis (Ph.D.)--University of Missouri - Columbia, 2013.

This item must not be sold to any third party vendors.

The effects of starch and fiber combinations in feedlot diets were examined to determine optimum combinations for diet digestibility and animal performance as well as identify opportunities for fibrolytic enzyme inclusion improvement. Previous work was not conclusive on the optimum corn inclusion rate in fiber-based diets to optimize diet digestibility and animal performance. Fibrolytic enzyme addition also generated inconsistent results due to variations in activity, inclusion rates, strains and target substrates. Experiments in this thesis were performed to pinpoint the maximum corn inclusion rate in high fiber diets and determine the effects of fibrolytic enzyme addition to whole shell corn (WSC) diets with increasing fiber inclusion. Soybean hull (SH) diets with increasing WSC inclusion rates were compared in continuous culture fermenters and feedlot cattle. The fermenter study evaluated digestibilities, VFA production, lactic acid production and pH. Fiber digestibility was reduced as starch inclusion increased though an optimum balance between DM and fiber digestibility was between 80 and 90% SH inclusion. The subsequent feedlot study determined the maximum starch inclusion for optimum digestibility was 80:20, SH:WSC. Despite the optimum digestibility values, ADG and G:F decreased as SH inclusion increased, reinforcing the need to improve performance in animals fed diets containing fiber byproducts. Enzymes were evaluated as an option for improving fiber byproduct digestibility in high corn diets. An in vitro fermentation study identified 0.045% as the minimum dietary inclusion rate of a commercial proprietary mix of Bacillus subtilis, Aspergillus oryzae and Trichoderma viride (ENZ; Cattlemace, R & D Life Sciences LLC, Menomonie, WI). In continuous culture, increasing SH inclusion in corn diets improved NDF digestibility (NDFd) but reduced DM and OM digestibility. Adding 0.045% ENZ generated greater acetate, reduced propionate and increased acetate:propionate, indicating a favorable shift in fiber fermentation. Steers were fed the same WSC diets with increasing SH inclusion and ENZ addition. Despite a linear NDFd improvement in continuous culture, there was a cubic response in NDFd due to SH inclusion. Although ADF digestibility decreased in ENZ diets, there was a DIETxENZ interaction in G:F. There was no difference in ADG or G:F for steers consuming 100% WSC diets versus 14-28% SH diets with ENZ included. There was no G:F difference between ENZ and non-ENZ diets containing 7% or less SH or hay thus adequate substrate was not present to generate an ENZ response. An 80:20 SH:WSC diet optimizes fiber digestibility and animals can consume WSC diets containing 14-28% SH and 0.045% ENZ without negative effects on growth performance as compared to all WSC diets.

ISBN: 9781303550577Subjects--Topical Terms:

3174829
Animal sciences.

Improving fiber by-product utilization in high concentrate diets.
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520 $a The effects of starch and fiber combinations in feedlot diets were examined to determine optimum combinations for diet digestibility and animal performance as well as identify opportunities for fibrolytic enzyme inclusion improvement. Previous work was not conclusive on the optimum corn inclusion rate in fiber-based diets to optimize diet digestibility and animal performance. Fibrolytic enzyme addition also generated inconsistent results due to variations in activity, inclusion rates, strains and target substrates. Experiments in this thesis were performed to pinpoint the maximum corn inclusion rate in high fiber diets and determine the effects of fibrolytic enzyme addition to whole shell corn (WSC) diets with increasing fiber inclusion. Soybean hull (SH) diets with increasing WSC inclusion rates were compared in continuous culture fermenters and feedlot cattle. The fermenter study evaluated digestibilities, VFA production, lactic acid production and pH. Fiber digestibility was reduced as starch inclusion increased though an optimum balance between DM and fiber digestibility was between 80 and 90% SH inclusion. The subsequent feedlot study determined the maximum starch inclusion for optimum digestibility was 80:20, SH:WSC. Despite the optimum digestibility values, ADG and G:F decreased as SH inclusion increased, reinforcing the need to improve performance in animals fed diets containing fiber byproducts. Enzymes were evaluated as an option for improving fiber byproduct digestibility in high corn diets. An in vitro fermentation study identified 0.045% as the minimum dietary inclusion rate of a commercial proprietary mix of Bacillus subtilis, Aspergillus oryzae and Trichoderma viride (ENZ; Cattlemace, R & D Life Sciences LLC, Menomonie, WI). In continuous culture, increasing SH inclusion in corn diets improved NDF digestibility (NDFd) but reduced DM and OM digestibility. Adding 0.045% ENZ generated greater acetate, reduced propionate and increased acetate:propionate, indicating a favorable shift in fiber fermentation. Steers were fed the same WSC diets with increasing SH inclusion and ENZ addition. Despite a linear NDFd improvement in continuous culture, there was a cubic response in NDFd due to SH inclusion. Although ADF digestibility decreased in ENZ diets, there was a DIETxENZ interaction in G:F. There was no difference in ADG or G:F for steers consuming 100% WSC diets versus 14-28% SH diets with ENZ included. There was no G:F difference between ENZ and non-ENZ diets containing 7% or less SH or hay thus adequate substrate was not present to generate an ENZ response. An 80:20 SH:WSC diet optimizes fiber digestibility and animals can consume WSC diets containing 14-28% SH and 0.045% ENZ without negative effects on growth performance as compared to all WSC diets.
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