The impact of soybean derived trypsin inhibitor proteins and soybean hulls on nursery and grow-finish pig nutrient digestibility, growth performance, and carcass composition
type: CreativeWork
description: Soybean meal and soybean hulls are co-products of soybean oil production and have a nutrient profile that makes them a favorable ingredient in swine diets. However, components of these ingredients have anti-nutritive effects that hinder efficiency at high amounts in growing pig diets. Therefore, it is important to understand how to incorporate these ingredients into swine diets to optimize performance. Interestingly, our understanding of using soybean hulls in growing pig swine diets is not fully understood when one considers dietary energy formulation strategy, feed intake capacity, and their impact on carcass dressing percentage. Further, although it is well known that antinutritional protease inhibitor proteins are innate in soybean ingredients, the specific activity of these proteins in the complete feed that attenuates pig performance and health is limited. Therefore, the overall objective of this dissertation was to evaluate optimizing growth performance in nursery and grow-finish pigs using diet formulations that include soybean hulls and soybean antinutritional proteins. To accomplish this overarching objective, a series of studies were conducted and outlined across four research chapters (Chapter 2, 3, 4, and 5). In Chapter 2, an experiment was conducted to determine the effect of soybean-derived trypsin inhibitor protein on nursery pig performance and health. Likewise, Chapter 3 investigated the effects of trypsin inhibitor protein concentrations on growing pig performance and nitrogen digestibility. Chapter 4 presents an experiment conducted to determine the impact of soybean hull inclusion level and dietary formulation strategy on nursery pig performance. Finally, Chapter 5 investigates the effects of including soybean hulls into grow-finish pig diets and withdrawing the soybean hulls before marketing on pig growth performance and carcass composition. The body of research presented herein confirms the negative effects associated with varying anti-nutriti…
abstract: Soybean meal and soybean hulls are co-products of soybean oil production and have a nutrient profile that makes them a favorable ingredient in swine diets. However, components of these ingredients have anti-nutritive effects that hinder efficiency at high amounts in growing pig diets. Therefore, it is important to understand how to incorporate these ingredients into swine diets to optimize performance. Interestingly, our understanding of using soybean hulls in growing pig swine diets is not fully understood when one considers dietary energy formulation strategy, feed intake capacity, and their impact on carcass dressing percentage. Further, although it is well known that antinutritional protease inhibitor proteins are innate in soybean ingredients, the specific activity of these proteins in the complete feed that attenuates pig performance and health is limited. Therefore, the overall objective of this dissertation was to evaluate optimizing growth performance in nursery and grow-finish pigs using diet formulations that include soybean hulls and soybean antinutritional proteins. To accomplish this overarching objective, a series of studies were conducted and outlined across four research chapters (Chapter 2, 3, 4, and 5). In Chapter 2, an experiment was conducted to determine the effect of soybean-derived trypsin inhibitor protein on nursery pig performance and health. Likewise, Chapter 3 investigated the effects of trypsin inhibitor protein concentrations on growing pig performance and nitrogen digestibility. Chapter 4 presents an experiment conducted to determine the impact of soybean hull inclusion level and dietary formulation strategy on nursery pig performance. Finally, Chapter 5 investigates the effects of including soybean hulls into grow-finish pig diets and withdrawing the soybean hulls before marketing on pig growth performance and carcass composition. The body of research presented herein confirms the negative effects associated with varying anti-nutriti…
author: Miller, Kayla Ann
language: en
date published: 2025-05
date modified: 2026-07-24T02:37:49Z
provider: Iowa State University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Iowa State University

PropertyValue
property ID: DOI
value: 10.31274/td-20251215-72