Effect of lower-energy, higher-fiber diets on pigs divergently selected for residual feed intake when fed higher-energy, lower-fiber diets

dc.contributor.author Mauch, E. D.
dc.contributor.author Young, J. M.
dc.contributor.author Patience, John
dc.contributor.author Serão, Nick
dc.contributor.author Hsu, W. L.
dc.contributor.author Patience, John
dc.contributor.author Kerr, B. J.
dc.contributor.author Weber, T. E.
dc.contributor.author Gabler, Nicholas
dc.contributor.author Dekkers, Jack
dc.contributor.department Animal Science
dc.date 2021-02-09T22:15:59.000
dc.date.accessioned 2021-02-24T21:14:13Z
dc.date.available 2021-02-24T21:14:13Z
dc.date.issued 2018-04-01
dc.description.abstract <p>Residual feed intake (RFI) is the difference between observed and predicted feed intake of an animal, based on growth and maintenance requirements. In Yorkshire pigs, divergent selection for increased (Low RFI) and decreased (High RFI) RFI was carried out over 10 generations (G) while feeding a corn- and soybean-meal-based, higher-energy, lower-fiber (HELF) diet. In G8 to G10, representing 4 replicates, barrows and gilts (<em>n</em> = 649) of the RFI lines were fed the HELF diet and a diet incorporating coproducts that were lower in energy and higher in dietary fiber (LEHF). The diets differed in ME, 3.32 vs. 2.87 Mcal/kg, and in neutral detergent fiber (NDF), 9.4% vs. 25.9%, respectively. The impact of the LEHF diet on 1) performance and growth, 2) diet digestibility, 3) genetic parameter estimates, and 4) responses to selection for RFI, when fed the HELF, was assessed. In general, the LEHF diet reduced the performance of both lines. When fed the HELF diet, the Low RFI pigs had lower (<em>P</em> < 0.05) ADFI (−12%), energy intake (−12%), ADG (−6%), and backfat depth (−12%); similar (<em>P</em> > 0.05) loin muscle area (LMA; +5%); and greater (<em>P</em> < 0.05) feed efficiency (i.e., 8% higher G:F and 7% lower RFI) than the High RFI line. These patterns of line differences were still present under the LEHF diet but differences for ADFI (−11%), energy intake (−10%), G:F (+2%), and RFI (−6%) were reduced compared to the HELF diet. Apparent total tract digestibility (ATTD) of the HELF and LEHF diets was assessed using 116 barrows and gilts from G8. When fed the HELF diet, ATTD of DM, GE, N, and NDF were similar between lines (<em>P</em> ≥ 0.27), but when fed the LEHF diet, the Low RFI pigs had greater digestibility (7%, 7%, 10%, and 32%) than the High RFI line (<em>P</em> ≤ 0.04). To measure responses to selection for RFI and estimate genetic parameters, data from all 10 generations were used (HELF; <em>n</em> = 2,310; LEHF, <em>n</em> = 317). Heritability estimates of performance traits ranged from 0.19 to 0.63, and genetic correlations of traits between diets were high and positive, ranging from 0.87 (RFI) to 0.99 (LMA). By G10, RFI in the Low RFI line was 3.86 and 1.50 genetic SD lower than in the High RFI line when fed the HELF and LEHF diets, respectively. Taken together, the results of this study demonstrate that responses to selection for RFI when fed a HELF diet are not fully realized when pigs are fed an extremely LEHF diet. Thus, feeding diets that differ from those used for selection may not maximize genetic potential for feed efficiency.</p>
dc.description.comments <p>This article is published as Mauch, E. D., J. M. Young, N. V. L. Serão, W. L. Hsu, J. F. Patience, B. J. Kerr, T. E. Weber, N. K. Gabler, and J. C. M. Dekkers. "Effect of lower-energy, higher-fiber diets on pigs divergently selected for residual feed intake when fed higher-energy, lower-fiber diets." <em>Journal of animal science</em> 96, no. 4 (2018): 1221-1236. doi:<a href="https://doi.org/10.1093/jas/sky065">10.1093/jas/sky065</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/ans_pubs/727/
dc.identifier.articleid 1748
dc.identifier.contextkey 21565918
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ans_pubs/727
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/93482
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ans_pubs/727/2018_Patience_EffectLower.pdf|||Sat Jan 15 01:45:12 UTC 2022
dc.source.uri 10.1093/jas/sky065
dc.subject.disciplines Agriculture
dc.subject.disciplines Animal Sciences
dc.subject.disciplines Biochemical Phenomena, Metabolism, and Nutrition
dc.subject.disciplines Genetics
dc.subject.keywords digestibility
dc.subject.keywords feed efficiency
dc.subject.keywords genetic parameters
dc.subject.keywords genotype-by-diet interaction
dc.subject.keywords low-quality feedstuffs
dc.subject.keywords response to selection
dc.title Effect of lower-energy, higher-fiber diets on pigs divergently selected for residual feed intake when fed higher-energy, lower-fiber diets
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 5888d61a-1b3d-48c9-ab84-deb63aa3a43c
relation.isOrgUnitOfPublication 85ecce08-311a-441b-9c4d-ee2a3569506f
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