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Use of Feed Enzyme on Growth and Hea...

Chen, Hongyu.

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Use of Feed Enzyme on Growth and Health of Pigs.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Use of Feed Enzyme on Growth and Health of Pigs./
Author:	Chen, Hongyu.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	184 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
Contained By:	Dissertation Abstracts International78-10B(E).
Subject:	Animal sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10610687
ISBN:	9781369855708

Use of Feed Enzyme on Growth and Health of Pigs.
Chen, Hongyu.

Use of Feed Enzyme on Growth and Health of Pigs. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 184 p.

Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.

Thesis (Ph.D.)--North Carolina State University, 2017.

The research hypothesis is that feed enzymes degrade their corresponding substrates including nutrients and anti-nutritional compounds in the feed, and enhance nutrient digestion, intestinal health, and growth of pigs. Therefore, keratinase, mannanase, xylanase, and glucanase targeting kafirin, mannan, xylan, and beta-glucan, respectively in feedstuffs, have been used to investigate their effects on digesta viscosity, nutrient digestibility, gut health, and growth performance of pigs.

ISBN: 9781369855708Subjects--Topical Terms:

3174829
Animal sciences.

Use of Feed Enzyme on Growth and Health of Pigs.
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100 1 $a Chen, Hongyu. $3 3350864
245 1 0 $a Use of Feed Enzyme on Growth and Health of Pigs.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 184 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-10(E), Section: B.
502 $a Thesis (Ph.D.)--North Carolina State University, 2017.
520 $a The research hypothesis is that feed enzymes degrade their corresponding substrates including nutrients and anti-nutritional compounds in the feed, and enhance nutrient digestion, intestinal health, and growth of pigs. Therefore, keratinase, mannanase, xylanase, and glucanase targeting kafirin, mannan, xylan, and beta-glucan, respectively in feedstuffs, have been used to investigate their effects on digesta viscosity, nutrient digestibility, gut health, and growth performance of pigs.
520 $a Experiment 1 (Chapter 2) evaluated effects of supplemental protease on nursery pigs when fed diets with sorghum. A total of 144 pigs (18.4 +/- 2.3 kg at 6 wk of age) were allotted to 4 treatments in a 2 x 2 factorial arrangement (corn or sorghum basal diet, and 0 or 0.05% protease as 2 factors). This study found that use of sorghum fully replacing corn in nursery diets could be beneficial to nursery pigs with enhanced feed intake and growth of nursery pigs, potentially by reducing oxidative stress. Supplementation of protease improved protein digestion and gut health, irrespective of sorghum or corn based diets.
520 $a Three experiments (Chapter 3) investigated effects of dietary mannanase and xylanase on nursery pigs fed diets with corn distillers dried grains with solubles (DDGS). In Exp. 1, eighty-four pigs (17.6 +/- 2.8 kg initial BW at 6 wk of age) were allotted to 2 treatments in a 40-d trial: corn-soybean meal-20% DDGS based diet with or without 0.05% mannanase. In Exp. 2, forty pigs (10.7 +/- 1.2 kg initial BW at 6 wk of age) were allotted to 4 treatments in a 2 x 2 factorial arrangement (0 or 30% DDGS, and 0 or 0.01% xylanase as 2 factors) in a 21-d trial. In Exp. 3, thirty-two pigs (6.2 +/- 0.8 kg) at 3 wk of age were allotted to 4 dietary treatments in a 20-d trial: CON (control diet, corn-soybean meal with 15% DDGS), MAN (CON with 0.05% mannanase), XYL (CON with 0.01% xylanase), and XYL+MAN (CON with both enzymes). Collectively, feeding a diet with 30% DDGS to nursery pigs for 3 wk had no negative effect on growth performance, but could be potentially harmful to gut health of pigs. Adding mannanase and xylanase had little improvement on growth performance, but could improve gut health of nursery pigs.
520 $a Experiment 5 (Chapter 4) evaluated effects of supplemental glucanase on nursery pigs fed diets with DDGS. Sixty pigs (10.2 +/- 1.3 kg initial BW at 5 wk of age) were randomly allotted to 6 dietary treatments based on a 2 x 3 factorial arrangement. Dietary DDGS (15 or 30%) and glucanase (0, 150, or 450 U/kg feed) were 2 factors. This study showed that increasing dietary DDGS from 15% to 30% did not affect the overall performance during 21 days, but impaired gut health in nursery pigs. Supplemental glucanase has the potential to improve growth and gut health of pigs fed diets with DDGS, by decreasing digesta viscosity and oxidative stress, and improving NDF digestibility and gut morphology.
520 $a Experiment 6 and 7 (Chapter 5) investigated effects of supplemental NSP degrading enzymes on nursery and grower pigs fed low nutrient diets. One hundred and eighty pigs were used in each 42-d experiment, and randomly assigned to 3 treatments: a positive control diet (PC), a low nutrient diet, and a low nutrient diet with NSP enzymes. In the nursery study, the low nutrient diet reduced NE and standardized ileal digestible (SID) Lys by 8% and 35%, respectively, while in the grower study, it reduced SID Lys by 35%. In both experiments, pigs fed low nutrient diets had poorer growth performance than those fed with PC. Supplementing NSP enzymes did not significantly improve growth performance of pigs fed with low nutrient diets.
520 $a In conclusion, sorghum is a good substitute of corn in swine diets by improving daily gain and gut health. As a high-NSP ingredient, DDGS did not cause any negative effect on growth performance, however, it impaired gut health of pigs. Although feed enzymes used in these experiments did not show any great improvements on growth performance, it enhanced nutrient digestibility and gut health of pigs, potentially by decreasing digesta viscosity, oxidative stress, and inflammatory response, as well as improving gut morphology and permeability.
590 $a School code: 0155.
650 4 $a Animal sciences. $3 3174829
650 4 $a Agriculture. $3 518588
650 4 $a Nutrition. $3 517777
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710 2 $a North Carolina State University. $b Animal Science and Poultry Science. $3 3350865
773 0 $t Dissertation Abstracts International $g 78-10B(E).
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791 $a Ph.D.
792 $a 2017
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10610687