Age at puberty, ovulation rate, and uterine length of developing gilts fed two lysine and three metabolizable energy concentrations from 100 to 260 d of age

dc.contributor.author Calderón Díaz, J. A.
dc.contributor.author Vallet, J. L.
dc.contributor.author Stalder, Kenneth
dc.contributor.author Lents, C. A.
dc.contributor.author Nonneman, D. J.
dc.contributor.author Miles, J. R.
dc.contributor.author Wright, E. C.
dc.contributor.author Rempel, L. A.
dc.contributor.author Cushman, R. A.
dc.contributor.author Freking, B. A.
dc.contributor.author Rohrer, G. A.
dc.contributor.author Phillips, C.
dc.contributor.author DeDecker, A.
dc.contributor.author Foxcroft, G.
dc.contributor.author Stalder, K.
dc.contributor.department Animal Science
dc.date 2018-03-13T17:59:22.000
dc.date.accessioned 2020-06-29T23:40:27Z
dc.date.available 2020-06-29T23:40:27Z
dc.date.issued 2015-07-01
dc.description.abstract <p>The objective of this study was to determine the effect of ad libitum feeding diets differing in standard ileal digestible (SID) lysine and ME concentrations that bracket those fed to developing gilts in U.S. commercial settings. Average SID lysine and ME concentrations in diets currently fed to developing gilts were obtained from a poll of the U.S. commercial swine industry. Crossbred Large White × Landrace gilts (<em>n</em> = 1,221), housed in groups, were randomly allotted to 6 corn-soybean diets in a 2 × 3 factorial arrangement formulated to provided 2 SID lysine and 3 ME concentrations. Gilts received grower diets formulated to provide 1.02% (control = survey average) or 0.86% (control minus 15%) SID lysine and 2.94, 3.25, or 3.57 (survey average ME ± 10%) Mcal of ME/kg from 100 d of age until approximately 90 kg BW. Then, gilts were fed finisher diet containing 0.85% (control = survey average) or 0.73% (control minus 15%) SID lysine and 2.94, 3.26, or 3.59 (control ± 10%) Mcal of ME/kg until 260 d of age. Gilts were weighed, and backfat thickness and loin muscle area were recorded at the beginning of the trial and then every 28 d. Starting at 160 d of age, gilts were exposed daily to vasectomized boars and observed for behavioral estrus. At approximately 260 d of age, gilts were slaughtered and their reproductive tract was collected. Each reproductive tract was examined to determine whether the gilt was cyclic, the stage of estrus cycle, ovulation rate, and uterine length. Data were evaluated for normality and analyzed using mixed model methods. Average age at puberty was 193 d of age with a range from 160 to 265 d. When all gilts on trial at 160 d of age were included in the analysis, 91.0% reached puberty as determine by observation of standing estrus. Differences between dietary treatments on age at puberty or measurements of the reproductive tract were not detected. Growth rates to 160 d were not limiting for attainment of puberty in response to daily boar stimulation from 160 d.</p>
dc.description.comments <p>This article is published as Calderón Díaz, J. A., J. L. Vallet, C. A. Lents, D. J. Nonneman, J. R. Miles, E. C. Wright, L. A. Rempel et al. "Age at puberty, ovulation rate, and uterine length of developing gilts fed two lysine and three metabolizable energy concentrations from 100 to 260 d of age." <em>Journal of animal science</em> 93, no. 7 (2015): 3521-3527. doi: <a href="https://doi.org/10.2527/jas.2014-8522">10.2527/jas.2014-8522</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/ans_pubs/390/
dc.identifier.articleid 1387
dc.identifier.contextkey 11761489
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ans_pubs/390
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/9814
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ans_pubs/390/2015_Stalder_AgePuberty.pdf|||Fri Jan 14 23:55:22 UTC 2022
dc.source.uri 10.2527/jas.2014-8522
dc.subject.disciplines Agriculture
dc.subject.disciplines Animal Sciences
dc.subject.disciplines Nutrition
dc.subject.keywords age at puberty
dc.subject.keywords gilts
dc.subject.keywords metabolizable energy
dc.subject.keywords reproductive tract
dc.subject.keywords SID lysine
dc.title Age at puberty, ovulation rate, and uterine length of developing gilts fed two lysine and three metabolizable energy concentrations from 100 to 260 d of age
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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