Research Article

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Selection among broilers for performance traits is resulting in locomotion problems and bone disorders, once skeletal structure is not strong enough to support body weight in broilers with high growth rates. In this study, genetic parameters were estimated for body weight at 42 days of age (BW42), and tibia traits (length, width, and weight) in a population of broiler chickens. ... more

B.N.N. Ragognetti; N.B. Stafuzza; T.C.S. Chud; N.V. Grupioni; V.A.R. Cruz; J.O. Peixoto; K. Nones; M.C. Ledur; D.P. Munari; T.B.R. Silva
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Bayesian inference; Beef cattle; Conformation score; Heritability; Threshold model

We obtained heritability and (co)variance component estimates for slaughter conformation scores at 420 days of age (SCS420), age at calving (first, AFC; second, ASC), calving occurrence until 38 months of age (CP38), weight at 420 days of age (W420), and scrotal circumference at 420 days (SC420) in Canchim (5/8 Charolais + 3/8 Zebu) cattle. A total of 23, ... more

L.H.F. Borba; F. Baldi; F.L.B. Feitosa; L.O.C. da Silva; A.S.C. Pereira; M.M. Alencar; L.H.F. Borba; F. Baldi; F.L.B. Feitosa; L.O.C. da Silva; A.S.C. Pereira; M.M. Alencar
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broiler; Genetic correlation; Gibbs sampling; Heritability; Liver fat trait; Restricted maximum likelihood

Intensive selection of broilers for improved growth rate is known to exert a negative effect on broiler health, such as an increase in body fat (and its related diseases). Excessive fat deposition in the liver can cause fatty liver hemorrhagic syndrome (FLHS); in addition, traits associated with liver fat have also been associated with FLHS. This study explored the genetic relationships ... more

M.J. Liang; Z.P. Wang; L. Xu; L. Leng; S.Z. Wang; P. Luan; Z.P. Cao; Y.M. Li; H. Li
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Selection for lower somatic cell count has been included in the breeding objectives of several countries in order to increase resistance to mastitis. Genetic parameters of somatic cell scores (SCS) were estimated from the first lactation test day records of Brazilian Holstein cows using random-regression models with Legendre polynomials (LP) of the order 3-5. Data consisted of 87,711 TD ... more

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Brassica napus; Correlation coefficients; Gene action; Heritability; Quality traits

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General and specific combining ability; Genotypic correlations; Heritability; Principal component analysis; Zea mays L.

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R.W. Muhammad; A. Qayyum; A. Hamza; M.Q. Ahmad; N.S. Naseer; S. Liaqat; B. Ahmad; W. Malik; E. Noor
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Accuracy; Computer simulation; Detection power; Heritability; Multiple procedures; QTL mapping

The study of quantitative trait effects is of great significance for molecular marker-assisted breeding. The accuracy of quantitative trait loci (QTL) mapping is the key factor affecting marker-assisted breeding, and is extremely significant. The effect of different heritability rates (10, 30, 50, 70, and 90%) on the accuracy of QTL mapping of five recombinant inbred lines (RILs) were ... more

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Bayesian analysis; Beef cattle; Genetic correlation; Heritability; Postweaning weight gain; Skin thickness

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