03749naa a2200373 a 450000100080000000500110000800800410001902200320006002400320009210000160012424500880014026000090022850006570023752019840089465300220287865300160290065300140291665300250293065300560295570000200301170000210303170000190305270000180307170000170308970000250310670000200313170000160315170000220316770000140318970000170320370000130322070000220323377301200325510644432024-01-29       2023    bl uuuu     u00u1 u    #d  a1516-3598; e-ISSN 1806-92907 a10.37496/rbz52202102272DOI1 aLOPES, J.F.  aPrice determinants of beef bulls sold in livestock auctions.h[electronic resource]  c2023  aArticle history: Received 17 December 2021, Accepted 2 February 2023, Publication in this collection 09 October 2023, Date of issue 2023. -- Document type: Article Gold Open Access. -- Correspondence: Barcellos, J.O.J.; Universidade Federal do Rio Grande do Sul, Departamento de Zootecnia, RS, Porto Alegre, Brazil; email:julio.barcellos@ufrgs.br  --  Funding: The authors are grateful for the financial support of the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). -- License: This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).  aABSTRACT.- The main objective of this study was to evaluate the effects of phenotypic, genotypic, and auction characteristics that may influence the selling prices of bulls. Data from 1,540 Braford and 1,179 Brangus bulls sold at auctions in the state of Rio Grande do Sul, Brazil, were collected and evaluated individually. Body condition score (BCS), muscularity, frame, foreskin size, presence or absence of horns, and data regarding the auction such as name/venue, event edition, forms of payment, among others, were considered. Information such as weight at the time of sale, scrotal circumference (SC), expected profit differences, selection indexes, and date of birth were collected from the catalogs supplied at the auctions. To obtain the influence of the selected explanatory variables throughout the conditional distribution of bull prices, a quantile regression was used, and the quantiles were established as follows: 10th, 25th, 50th, 75th, and 90th. The buyers of Braford and Brangus bulls valued characteristics such as age, weight, and SC in relation to frame, muscularity, BCS, and foreskin size. In addition, the price behavior at different auctions was positively related to the operation time of the auction in this market and with the reputation of the seller. Regarding genetic variables of Brangus bulls, these had little or no influence on the selling price. There was a positive influence on the weaning index in the 90th quantile and on the final index in the 50th and 75th quantiles. Buyers of synthetic bull breeds at auctions value the phenotypic characteristics of bulls more than they do genetic characteristics, which may not reflect permanent gains in the cattle herd. © This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.  aAnimal production  aBeef cattle  aMarketing  aPhenotypic variation  aPLATAFORMA DE INVESTIGACIÓN EN SALUD ANIMAL - INIA1 aCANOZZI, M.E.A.1 aGONÇALVES, T.L.1 aDA ROCHA, M.K.1 aSARTORI, E.D.1 aSESSIM, A.G.1 aDE PAULA PEREIRA, I.1 aDE AGUIAR, L.K.1 aPAPARAS, D.1 aMENEGASSI, S.R.O.1 aKOETZ, C.1 aOAIGEN, R.P.1 aZAGO, D.1 aBARCELLOS, J.O.J.  tRevista Brasileira de Zootecnia, 2023, Volume 52, e20210227. https://doi.org/10.37496/rbz5220210227 -- OPEN ACCESS.