L.G. Gaya, A.M.M.A. Costa, J.B.S. Ferraz, F.M. Rezende, E.C. Mattos,J.P. Eler, T. Michelan Filho, G.B. Mourão and L.G.G. Figueiredo
Published December 4, 2007
Genet. Mol. Res. 6 (4): 1091-1096 (2007)
About the authors
L.G. Gaya, A.M.M.A. Costa, J.B.S. Ferraz, F.M. Rezende, E.C. Mattos,J.P. Eler, T. Michelan Filho, G.B. Mourão and L.G.G. Figueiredo
Corresponding author
L.G. Gaya
E-mail: lggaya@yahoo.com.br
ABSTRACT
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 of the genetic trends for absolute and relative heart weight were found to be -0.08 g and -0.004% per hatch-year, respectively. These trends show that heart weight in the line analyzed, in absolute and relative terms, has tended to decrease, which can make the metabolic disorders due to the reduction in heart weight in broilers even worse.
Key words: Animal breeding, Ascitic syndrome, Genetic value, Sudden death syndrome