Degree Type

Thesis

Date of Award

2012

Degree Name

Master of Science

Department

Animal Science

First Advisor

John F. Patience

Second Advisor

Kenneth J. Stalder

Abstract

The study objectives were to determine the effect of feeder space allowance on nursery pig performance, and to determine the effect of the same feeder space allowance in combination with varying DDGS inclusion levels on finishing pig performance, carcass characteristics, and nutrient digestibility. These studies were carried out on the same group of pigs within a commercial wean-finish system. For the nursery phase, a completely randomized design was used to compare 3 feeder space allowance treatments (2.1, 2.5, 2.9 cm/pig). Pigs (n = 3,720) were randomly allotted to same sex pens (10 feeders /treatment) of 62 pigs/pen. Thirty 7-hole double sided feeders were utilized in the study. Differing linear feeder space treatments were established by blocking off feeder sections for both studies. All pigs had equal floor space (0.85m²/pig). In the grow-finish phase, a total of 60 pens (n = 1,860 pigs) were utilized in a 2 х 3 factorial design with 3 feeder space allowances (4.1, 4.9, or 5.7 cm/pig) and 2 dietary DDGS treatments (D30 and D60). Fecal and diet samples were collected and analyzed to determine apparent total tract digestibility % (ATTD %) and energy content. In the nursery portion of the trial, there was no effect of feeder space treatment on ADG, ADFI, or feed efficiency (P > 0.05) from weaning to d 56 post-weaning or during any weigh period. In the grow-finish portion of the trial, feeder space allowance and DDGS inclusion level did not affect ADG, ADFI, or feed efficiency (P > 0.05) from d 57 post-weaning to market. Pigs that were fed the D30 diet had a heavier HCW, higher percent yield, and greater loin depth than those on the D60 diet (P < 0.05). There were no backfat depth treatment differences (P > 0.05). Pigs on the D30 treatment had greater (P < 0.05) ATTD of DM and GE for both collection periods compared to those on the D60 treatment. Energy content of the diet was greater for the D30 diet (P < 0.05) for period 1, but not for period 2. In summary, feeder space allowance did not impact pig performance overall during the nursery and grow-finish phase. Inclusion of DDGS at a higher level will decrease ADFI, but not ADG or efficiency when diets are isocaloric. Higher DDGS inclusion will impact HCW and percent yield, due to increased intestinal weight providing a greater proportion of weight for pigs fed high inclusions of DDGS. DM and energy digestibility was greater for the D30 diet; however energy content of the diets varied between fecal collection periods.

Copyright Owner

Emily Kathryn Weber

Language

en

File Format

application/pdf

File Size

61 pages

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