Dietary lysine-to-energy ratios for managing growth and pubertal development in replacement gilts

dc.contributor.author Lents, C. A.
dc.contributor.author Stalder, Kenneth
dc.contributor.author Supakorn, C.
dc.contributor.author DeDecker, A. E.
dc.contributor.author Phillips, C. E.
dc.contributor.author Boyd, R. D.
dc.contributor.author Vallet, J. L.
dc.contributor.author Rohrer, G. A.
dc.contributor.author Foxcroft, G. R.
dc.contributor.author Flowers, W. L.
dc.contributor.author Trottier, N. L.
dc.contributor.author Salak-Johnson, J. L.
dc.contributor.author Bartol, F. F.
dc.contributor.author Stalder, Kenneth
dc.contributor.department Animal Science
dc.date 2020-10-06T15:12:04.000
dc.date.accessioned 2021-02-24T21:11:41Z
dc.date.available 2021-02-24T21:11:41Z
dc.date.issued 2020-10-01
dc.description.abstract <p>Objective: Our objective was to determine growth rates, body composition, and pubertal development of replacement gilts fed diets with different ratios of standardized ileal digestible (SID) lysine to ME.</p> <p>Materials and Methods: Diets with low, medium, and high ratios of SID lysine to ME (grower: 2.3, 2.6, and 2.8; and, finisher; 1.7, 1.9, and 2.1 g/Mcal) were fed from 100 to 200 d of age, after which gilts were moved from the gilt development unit to sow farms. Boar exposure and estrus detection began at 160 d of age and continued until first detected estrus. Estimates of BW and body composition were determined at 100, 142, 160, and 200 d of age and at puberty.</p> <p>Results and Discussion: Body weights and growth rates were reduced (P < 0.05) as dietary SID lysine–to– ME ratio decreased. Greater SID lysine–to–ME ratios increased the number of gilts that exhibited estrus upon boar exposure, increased the number of gilts with a spontaneous first estrus, reduced the number of gilts requiring P.G.600 (Merck Animal Health, Kenilworth, NJ), and decreased age at first estrus (P < 0.05). Slower growing gilts that weighed less with less backfat were more likely to require P.G.600 to induce puberty (P < 0.05).</p> <p>Implications and Applications: Reducing SID lysine– to–ME ratios in gilt diets can increase the number of gilts within optimal BW range at first estrus, but overall pubertal development is delayed if ratios are reduced below 2.8 and 2.1 g of SID lysine to megacalorie of ME in grower and finisher diets, respectively.</p>
dc.description.comments <p>This article is published as Lents, C. A., C. Supakorn, A. E. DeDecker, C. E. Phillips, R. D. Boyd, J. L. Vallet, G. A. Rohrer et al. "Dietary lysine-to-energy ratios for managing growth and pubertal development in replacement gilts." <em>Applied Animal Science</em> 36, no. 5 (2020): 701-714. doi: <a href="https://doi.org/10.15232/aas.2020-02016" target="_blank" title="Persistent link using digital object identifier">10.15232/aas.2020-02016</a>.</p>
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dc.identifier archive/lib.dr.iastate.edu/ans_pubs/581/
dc.identifier.articleid 1582
dc.identifier.contextkey 19680486
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ans_pubs/581
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/93336
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ans_pubs/581/2020_Stalder_DietaryLysine.pdf|||Sat Jan 15 01:01:44 UTC 2022
dc.source.uri 10.15232/aas.2020-02016
dc.subject.disciplines Agriculture
dc.subject.disciplines Animal Experimentation and Research
dc.subject.disciplines Animal Sciences
dc.subject.keywords gilt
dc.subject.keywords growth
dc.subject.keywords puberty
dc.subject.keywords diet
dc.subject.keywords lysine
dc.title Dietary lysine-to-energy ratios for managing growth and pubertal development in replacement gilts
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 0b0a34a3-f123-4f94-a9cf-e730cb2183a6
relation.isOrgUnitOfPublication 85ecce08-311a-441b-9c4d-ee2a3569506f
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