Research Article

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Animal breeding; broiler; Genetic trend; meat quality; poultry quality

The present research was conducted to estimate the genetic trends for meat quality traits in a male broiler line. The traits analyzed were initial pH, pH at 6 h after slaughter, final pH, initial range of falling pH, final range of falling pH, lightness, redness, yellowness, weep loss, drip loss, shrink loss, and shear force. The number of observations varied between 618 and 2125 for each ... more

G.B. Mourão; L.G. Gaya; J.B.S. Ferraz; E.C. Mattos; A.M.M.A. Costa; M. Filho; O.C.Cunha Neto; A.M. Felício; J.P. Eler
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Animal breeding; Ascitic syndrome; Genetic value; Sudden death syndrome

Data of chickens from a broiler-breeding program have been collected and used for determination of genetic trends of absolute and relative heart weight. The genetic trends have been estimated by regression of the genetic values of the traits over hatch-year. Genetic values of 42,912 individuals, obtained by restricted maximum likelihood, were used for regression analysis. The estimates ... more

L.G. Gaya; A.M.M.A. Costa; J.B.S. Ferraz; F.M. Rezende; E.C. Mattos; J.P. Eler; M. Filho; G.B. Mourão; L.G.G. Figueiredo
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Animal breeding; DNA sequencing; Double muscling; Meat production; Single nucleotide polymorphisms

The myostatin gene, also known as GDF8 (growth dif­ferentiation factor 8), is located on bovine chromosome 2 (BTA2); it has three exons and two introns. Myostatin is specifically expressed during embryonic development and in adult skeletal muscle, func­tioning as a negative regulatory protein. Several cattle breeds (Pied­montese, Belgian Blue and Blond’Aquitaine, and others) show poly­ ... more

A.B. Grisolia; G.T. D’Angelo; L.R.Porto Neto; F. Siqueira; J.F. Garcia
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Animal breeding; Breeding value; Carcass yield; Genetic gain; Poultry

Data from the slaughter of 24,001 chickens that were part of a selection program for the production of commercial broilers were used to estimate genetic trend for absolute carcass (CW), breast meat (BRW), and leg (LW) weights, and relative carcass (CY), breast meat (BRY), and leg (LY) weights. The components of (co)variance and breeding values of individuals were obtained by the restricted ... more

J.L.B.M. Grosso; J.C.C. Balieiro; J.P. Eler; J.B.S. Ferraz; E.C. Mattos; M. Filho; A.M. Felício; F.M. Rezende
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The structure of genetic groups is a technique that allows animals with unknown pa­ternity to be included in genetic evaluation programs. The ways these groups are formed are still arbitrary, making it important to study different formation strategies for genetic groups, aiming for a suitable framework for the genetic evaluation of seedstock in animal breeding programs. Therefore, the aim ... more

G.A.Oliveira Junior
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Broilers; Eimeriosis; Multiplex PCR

We used PCR to test various protocols and define a technique for DNA extraction directly from chicken-shed stool samples for the identification of Eimeria species that parasitize birds. It was possible to extract and amplify DNA of seven Eimeria species from field stool samples, using both protocols tested; extractions made with phenol/chloroform protocols gave the best ... more

F.S. Carvalho; A.A. Wenceslau; M. Teixeira; G.R. Albuquerque
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Beef cattle; Genetic trend; Heritability; Productive efficiency; Selection

With the aim of estimating the coefficient of heritability of average annual productivity of Nellore cows (COWPROD), a data set from 24,855 animals with known pedigree was analyzed. COWPROD is defined as the amount (in kilograms) of weaned calves produced yearly by one cow during her remaining time in herd ignoring a fixed period of 365 days. COWPROD was calculated regarding three standards: a ... more

J.P. Eler; J.B.S. Ferraz; J.C.C. Balieiro; E.C. Mattos
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Coffee; Genetic value; Harvests

Biannuality in coffee culture causes temporal variability in plant productivity. Consequently, it is essential to evaluate genotypes during various crop years to ensure selection of productive and stable genotypes. We evaluated the effectiveness of simultaneous selection of coffee genotypes along harvests, based on productivity, stability, and adaptability, via mixed models, for ... more

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12/19/2014
Animals selected in common; Genetic value; Legendre

Random regression models have been used in evaluating test-day milk yield, providing accurate estimates of genetic values in animals. However, herd evaluation with only information from the first lactation may not be the best option from an economic perspective. Other factors should be taken into account, particularly other lactations. Our objective in this study was to analyze the ... more

F.G. Silva; R.A. Torres; L.P. Silva; H.T. Ventura; F.F. Silva; A.P.S. Carneiro; M. Nascimento; M.T. Rodrigues
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Abdominal fat; Animals; Body weight; Bone Density; Chickens; Core Binding Factor Alpha 1 Subunit; Femur; Genetic association studies; meat; Polymorphism, Single Nucleotide; RANK Ligand; Selection, Genetic

Intense selection for production traits has improved the genetic gain of important economic traits. However, selection for performance and carcass traits has led to the onset of locomotors problems and decreasing bone strength in broilers. Thus, genes associated with bone integrity traits have become candidates for genetic studies in order to reduce the impact of bone disorders in broilers. ... more

N.V. Grupioni; N.B. Stafuzza; A.B. Carvajal; A.M.G. Ibelli; J.O. Peixoto; M.C. Ledur; D.P. Munari