Genetic parameters for scrotal circumference, frame score and yearling weight of Mexican Charolais and Charbray young bulls

Utrera, Ángel Ríos; Bermúdez, Moisés Montaño; Murillo, Vicente Eliezer Vega; Martínez-Velázquez, Guillermo; Baeza-Rodríguez, Juan José

doi:10.17533/udea.rccp.v31n3a05

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…The heritability estimates were within the range of what has been reported in other studies. For example, heritability estimates for several cattle breeds using BLUP ( A −1 ) were in ranges from 0.15 to 0.36, from 0.10 to 0.27, and from 0.18 to 0.30 for BW, WW and YW, respectively [ 29 , 30 ].…”

Section: Discussionmentioning

confidence: 99%

Single-step genomic evaluation for growth traits in a Mexican Braunvieh cattle population

Valerio-Hernández¹,

Ruíz-Flores²,

Nilforooshan³

et al. 2023

Anim Biosci

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Objective:The objective was to compare (pedigree-based) BLUP, genomic BLUP (GBLUP), and single-step GBLUP (ssGBLUP) methods for genomic evaluation of growth traits in a Mexican Braunvieh cattle population.Methods: Birth (BW), weaning (WW), and yearling weight (YW) data of a Mexican Braunvieh cattle population were analyzed with BLUP, GBLUP, and ssGBLUP methods. These methods are differentiated by the additive genetic relationship matrix included in the model and the animals under evaluation. The predictive ability of the model was evaluated using random partitions of the data in training and testing sets, consistently predicting about 20% of genotyped animals on all occasions.For each partition, the Pearson correlation coefficient between adjusted phenotypes for fixed effects and non-genetic random effects and the estimated breeding values (EBV) were computed. Results:The random contemporary group (CG) effect explained about 50, 45, and 35% of the phenotypic variance in BW, WW, and YW, respectively. For the three methods, the CG effect explained the highest proportion of the phenotypic variances (except for YW-GBLUP). The heritability estimate obtained with GBLUP was the lowest for BW, while the highest heritability was obtained with BLUP. For WW, the highest heritability estimate was obtained with BLUP, the estimates obtained with GBLUP and ssGBLUP were similar. For YW, the heritability estimates obtained with GBLUP and BLUP were similar, and the lowest heritability was obtained with ssGBLUP. Pearson correlation coefficients between adjusted phenotypes for non-genetic effects and EBVs were the highest for BLUP, followed by ssBLUP and GBLUP. Conclusion:The successful implementation of genetic evaluations that include genotyped and nongenotyped animals in our study indicate a promising method for use in genetic improvement programs of Braunvieh cattle. Our findings showed that simultaneous evaluation of genotyped and nongenotyped animals improved prediction accuracy for growth traits even with a limited number of genotyped animals.

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Section: Discussionmentioning

confidence: 99%

Single-step genomic evaluation for growth traits in a Mexican Braunvieh cattle population

Valerio-Hernández¹,

Ruíz-Flores²,

Nilforooshan³

et al. 2023

Anim Biosci

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“…Scrotal circumference is usually considered a good reproductive characteristic and, when selecting it, farmers are able to quickly improve the herd's fertility and genetics (Bourdon and Brinks, 1986). The buyers' overprice valuation of animals with a greater SC may have other positive aspects, as this has a positive genetic correlation with body weight of yearling (Frizzas et al, 2009;Ríos-Utrera et al, 2018) and weaning animals (Eler et al, 1996;Cyrillo et al, 2001), which indicates that information about SC may be one of the major factors influencing the selection of bulls.…”

Section: Phenotypic Characteristicsmentioning

confidence: 99%

Price determinants of beef bulls sold in livestock auctions

Lopes,

Canozzi,

Gonçalves

et al. 2023

Revista Brasileira De Zootecnia

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Animal production systems and agribusinessFull-length research articlePrice determinants of beef bulls sold in livestock auctions ABSTRACT -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.

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“…En un estudio posterior (26) en el que se analizó información de toros jóvenes Charolais y Charbray, CE, TC y PA mostraron ser moderadamente heredables, con valores de 0.21, 0.25 y 0.30, respectivamente (Cuadro 4). Adicionalmente, las correlaciones genéticas de PA con CE y TC resultaron ser moderadamente fuertes (0.37 y 0.42, respectivamente; Cuadro 4), lo que significa que algunos genes que controlan PA también controlan CE y TC (efecto pleiotrópico), por lo tanto, se espera que toros jóvenes que destacan en PA también destaquen en CE y TC; por el contrario, éstas últimas dos características estuvieron débilmente correlacionadas (0.15; Cuadro 4).…”

Section: Evaluaciones Genéticas De Ganado Bos Taurus Y Bos Indicusunclassified

Logros, retos y perspectivas de la investigación en mejoramiento genético de bovinos productores de carne en el INIFAP

Utrera

Velázquez

Chagoya

et al. 2021

Rev. Mex. Cienc. Pecu.

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El objetivo fue presentar resultados de investigación sobre mejoramiento genético de bovinos productores de carne realizados por el Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, así como los retos y perspectivas de investigación a corto, mediano y largo plazo en dicha área del conocimiento. Se utilizaron tesis de maestría, trabajos de congresos y artículos científicos publicados de 1987 a 2020. En los últimos 34 años, se logró caracterizar productiva y reproductivamente animales Bos indicus y Bos taurus x Bos indicus en condiciones tropicales, implementar evaluaciones genéticas multirraciales para las poblaciones Simmental-Simbrah y Charolais-Charbray, determinar la importancia de los efectos maternos en características de crecimiento y estimar la heredabilidad y correlaciones genéticas para características de crecimiento y reproductivas de machos y hembras en animales Bos taurus y Bos indicus, comprobar que la interacción genotipo-ambiente es un factor importante en la expresión de peso al destete en Simmental, desarrollar factores de ajuste de edad de la madre para pesos al nacimiento y destete, desarrollar un prototipo de evaluación genética nacional para permanencia productiva y otro para fertilidad de vaquillas, estimar la diversidad genética de las poblaciones Simmental, Charolais y Simbrah, e identificar SNP asociados a características de crecimiento en Simmental y Simbrah. En el corto plazo, se espera desarrollar índices de selección y predecir el mérito genético de características de canal; en el mediano, realizar evaluaciones genómicas para tolerancia al estrés calórico, consumo de alimento residual y características de salud; y a largo plazo, realizar predicciones genómicas a través de razas.

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Genetic parameters for scrotal circumference, frame score and yearling weight of Mexican Charolais and Charbray young bulls

Cited by 5 publications

References 24 publications

Single-step genomic evaluation for growth traits in a Mexican Braunvieh cattle population

Single-step genomic evaluation for growth traits in a Mexican Braunvieh cattle population

Price determinants of beef bulls sold in livestock auctions

Logros, retos y perspectivas de la investigación en mejoramiento genético de bovinos productores de carne en el INIFAP

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