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dc.contributor.advisorJiménez-Cabán, Esbal
dc.contributor.authorMarrero-Torres, Paola N.
dc.date.accessioned2021-06-04T13:23:57Z
dc.date.available2021-06-04T13:23:57Z
dc.date.issued2021-05-13
dc.identifier.urihttps://hdl.handle.net/20.500.11801/2783
dc.description.abstractThe objective of this investigation was to study the effect of the slick hair genotype (SH) on the concentration of progesterone, insulin and non-esterified fatty acids (NEFA) in dairy heifers. The estrus of Holstein heifers [n=14 SH and n=14 wild type (WT)] was synchronized using a 5-day timed artificial insemination protocol (5TAI). Progesterone concentration was measured on serum obtained on days -3, -2, 0, 7, and 14 of the 5TAI. In addition, insulin concentration was measured on plasma obtained on days -8, -2 and 2 and NEFA concentration on day -8. Progesterone concentration from the days -3 to 0 (P = 0.844) and 0 to 14 (P = 0.235) was similar among the SH and WT genotypes. Progesterone concentration decreased (P < 0.0001) from day -3 to 0 (4.17 ± 0.33 ng/mL, 0.30 ± 0.33 ng/mL, and 0.08 ± 0.33 ng/mL, respectively) and increased (P < 0.0001) from day 0 to 14 (0.08 ± 0.76 ng/mL, 3.53 ± 0.76 ng/mL, and 13.58 ± 0.76 ng/mL, respectively). In the case of insulin concentration, there was a genotype x day effect (P = 0.014) only on day –8 (P = 0.049), were SH heifers had lower concentration than WT (11.79 ± 1.39 μU/mL and 15.77 ±1.44 μU/mL, respectively). In addition, there was a time effect (P < 0.0001) where insulin concentration from the PM sample was greater than the AM sample (16.57 ± 0.75 μU/mL and 12.78 ± 0.70 μU/mL, respectively). Meanwhile, NEFA concentration was similar (P = 0.1635) between slick hair heifers and wild type. In conclusion, there was a genotype x day effect for insulin concentration on day -8 of the protocol.en_US
dc.description.abstractEl objetivo de esta investigación fue estudiar el efecto del genotipo de pelo corto (PC) en la concentración de progesterona, insulina y ácidos grasos no esterificados (AGNE) en novillas lecheras. El estro de las novillas Holstein [n=14 PC y n=14 pelo normal (PN)] fue sincronizado usando un protocolo de 5 días de inseminación artificial a tiempo fijo (5IATF). La concentración de progesterona se midió en suero en los días -3, -2, 0, 7 y 14 del 5IATF. Además, la concentración de insulina se midió en plasma en los días -8, -2 y 2 y la de AGNE en el día -8. La concentración de progesterona fue similar desde los días -3 a 0 (P = 0.844) y en los días 0 a 14 (P = 0.235) entre los genotipos PC y PN. La concentración de progesterona disminuyó (P < 0.0001) del día -3 al 0 (4.17 ± 0.33 ng/mL, 0.30 ± 0.33 ng/mL, y 0.08 ± 0.33 ng/mL, respectivamente) y incrementó (P < 0.0001) del día 0 al 14 (0.08 ± 0.76 ng/mL, 3.53 ± 0.76 ng/mL, y 13.58 ± 0.76 ng/mL, respectivamente). En el caso de insulina, se encontró un efecto de genotipo x día (P = 0.014) solo en el día -8 (P = 0.049) donde las novillas PC tenían concentraciones menores de insulina que las de PN (11.79 ± 1.39 μU/mL y 15.77 ±1.44 μU/mL, respectivamente). Además, se encontró un efecto de tiempo (P < 0.0001) donde la concentración de insulina de la muestra PM era mayor que la de AM (16.57 ± 0.75 μU/mL y 12.78 ± 0.70 μU/mL, respectivamente). La concentración de AGNE fue similar (P = 0.1635) entre PC y PN. En conclusión, se encontró una interacción entre genotipo y día para la concentración de insulina solo en el día -8 del protocolo.en_US
dc.description.sponsorshipUSDA-NIFA-Hispanic Serving Institutions educational grants, # 2017-38422-27298; USDA- Hactch project PRH-471.en_US
dc.language.isoenen_US
dc.subjectDairy heifersen_US
dc.subjectAnimal reproductionen_US
dc.subject.lcshHeifersen_US
dc.subject.lcshGenotype-environment interactionen_US
dc.subject.lcshHeifers -- Artificial inseminationen_US
dc.subject.lcshInsulin -- Dose-response relationshipen_US
dc.titleProgesterone, insulin, and non-esterified fatty acids concentration in the blood of slick hair and wild type heifersen_US
dc.typeThesisen_US
dc.rights.holder(c) 2021 Paola N. Marrero Torresen_US
dc.contributor.committeeNegrón-Pérez, Verónica
dc.contributor.committeeOrtiz-Colón, Guillermo
dc.contributor.committeeNegrón-Pérez, Verónica
dc.contributor.committeeOrtiz-Colón, Guillermo
dc.contributor.representativePérez Muñoz, Fernando J.
thesis.degree.levelM.S.en_US
thesis.degree.disciplineAnimal Industryen_US
dc.contributor.collegeCollege of Agricultural Sciencesen_US
dc.contributor.departmentDepartment of Animal Scienceen_US
dc.description.graduationSemesterSpringen_US
dc.description.graduationYear2021en_US


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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a graduate degree at UPR-Mayagüez.

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(c) 2021 Paola N. Marrero Torres
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