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dc.creatorHarrison, Meredith A.
dc.creatorArce Cordero, José Alberto
dc.creatorSeidel Jr., George E.
dc.creatorArchibeque, Shawn L.
dc.creatorWhittier, Jack C.
dc.creatorRhoades, Ryan D.
dc.creatorAhola, Jason K.
dc.date.accessioned2023-06-19T18:10:50Z
dc.date.available2023-06-19T18:10:50Z
dc.date.issued2020-10-27
dc.identifier.citationhttps://academic.oup.com/tas/article/4/4/txaa191/5940757es_ES
dc.identifier.issn2573-2102
dc.identifier.urihttps://hdl.handle.net/10669/89492
dc.descriptionLa Universidad de Costa Rica apoyó el programa de doctorado de José Alberto Arce Corderoes_ES
dc.description.abstractThe All Heifer, No Cow (AHNC) beef production system is an alternative to con ventional cow/calf production that involves in semination of nulliparous heifers with sexed semen to produce female calves that are early weaned at 3 mo of age. Dams are finished on a high-concentrate diet and harvested before reach ing 30 mo of age. Objectives of this research were to document reproductive, feedyard, calf, and carcass performance of an AHNC herd; evaluate effects of carcass maturity on carcass quality; and determine if performance of initial cohorts (i.e., cohorts 1 and 2) differed from sustaining cohorts (i.e., cohorts 3–5). A total of 272 heifers were en rolled in the AHNC system via five annual co horts. The system was initiated with 51 yearling, Angus-based heifers, and a replicate set (n = 56) was started 12 mo after. Heifers in cohorts 3 (n = 53), 4 (n = 56), and 5 (n = 56) were primarily offspring of prior cohorts (i.e., cohort 3 heifers born to cohort 1 females), but some were pur chased to maintain inventory. Angus replacement heifers were purchased in cohorts 3 (n = 26), 4 (n = 26), and 5 (n = 28). Mean (±standard de viation) pregnancy rate at 30 d after fixed-time artificial insemination (AI) with sexed semen was 50.8% ± 9.4%, and 140-d pregnancy rate was 93.0% ± 1.5%. With AHNC, 61.0% ± 6.5% of fe males replaced themselves with a heifer. During finishing, average daily gain (ADG) was 1.9 ± 0.4 kg • d−1 and dry matter intake (DMI) was 14.9 ± 1.9 kg • d−1. Hot carcass weight (HCW) was 367 ± 35 kg. The USDA grading system clas sified 20.5% of all carcasses (n = 220) as C ma turity (A00 = 100, B00 = 200, etc.), 62.4% ± 29.1% of carcasses as USDA Choice. USDA yield grade (YG) was 2.6 ± 0.7. Based on cohorts 1 and 2, there were no differences (P = 0.96) in Warner– Bratzler shear force values between A and B ma turity vs. C maturity carcasses. Across all cohorts, there were no differences in USDA YG, marbling score (MA), and lean maturity between A and B maturity vs. C maturity carcasses; there were differences in age (P < 0.001), bone maturity (P < 0.001), and overall maturity (P <0.001). A comparison of initial vs. sustaining cohorts showed that initial cohorts had lower (P < 0.001) DMI, heavier (P < 0.001) HCW, and more ad vanced (P < 0.05) bone maturity. However, there were no differences for 30- and 140-d pregnancy rates, ADG, USDA YG, and MA between initial and sustaining cohorts. The AHNC beef produc tion system can effectively produce female calves and quality carcasses for harvest.es_ES
dc.description.sponsorshipUniversidad de Costa Rica/[]/UCR/Costa Ricaes_ES
dc.language.isoenges_ES
dc.sourceTranslational Animal Science, Vol.4(4), pp. 1-17es_ES
dc.subjectBeef production systemes_ES
dc.subjectBiological efficiencyes_ES
dc.subjectCATTLEes_ES
dc.subjectSex-selected semenes_ES
dc.subjectSingle-calf heiferes_ES
dc.titleEvaluation of performance and carcass traits for a five-cohort All Heifer, No Cow beef production system demonstration herdes_ES
dc.typeartículo originales_ES
dc.identifier.doi10.1093/tas/txaa191
dc.description.procedenceUCR::Vicerrectoría de Docencia::Ciencias Agroalimentarias::Facultad de Ciencias Agroalimentarias::Escuela de Zootecniaes_ES


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