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Variance heterogeneity for milk yield in Brazilian and Colombian Holstein herds
(2004-04-01)
Heterogeneity of variances for milk yield (MY) was determined for Brazilian and Colombian herds. The herds were grouped as high or low variability within each country, using as criterion the phenotypic standard deviation ...
Interacción genotipo x ambiente sobre el peso al destete de bovinos nelore en Brasil
(2008-07-25)
The objectives of this study were to evaluate the genotype x environmental interactions and estimates of genetic parameters for weaning weight (P205) in two Brazilian regions. Weights of Nellore calves (n= 46 390) were ...
Genetic susceptibility to bleomycin: A twin study
(1995-01-01)
The frequency of chromatid breaks was analysed in peripheral lymphocytes obtained from sixteen healthy monozygotic (MZ) and sixteen healthy dizygotic (DZ) pairs of twins. In addition, increases in the frequency of chromatid ...
Estudio cuantitativo de los tiempos en las carreras de purasangre en pistas de tierra y césped en Brasil
(2008-12-01)
This study was conducted to estimate the genetic parameters for race times on turf and dirt tracks of Thoroughbred race horses. Data used were recorded by the Turftotal Ltd. for 343,419 racing performance of 26,713 animals, ...
Genetic parameters for milk yield, age at first calving and interval between first and second calving in milk Murrah buffaloes
(2010-02-01)
In the present study, data of 1,578 first lactation females, calving from 1985 to 2006 were analysed with the purpose of estimating genetic parameters for milk yield (MY), age at first calving (AFC) and interval between ...
Genetic parameters for body weight, carcass chemical composition and yield in a broiler-layer cross developed for QTL mapping
(Sociedade Brasileira de Genética, 2011-01-01)
The objective of this study was to estimate genetic and phenotypic correlations of body weight at 6 weeks of age (BW6), as well as final carcass yield, and moisture, protein, fat and ash contents, using data from 3,422 F2 ...
Genetic parameters and environmental effects on temperament score and reproductive traits of Nellore cattle
(Cambridge University Press, 2012-01-01)
Animal temperament is a trait of economic relevance and its use as a selection criterion requires the identification of environmental factors that influence this trait, as well as the estimation of its genetic variability ...
Estimates of genetic parameters for scrotal circumference using random regression models in Nelore cattle
(Elsevier B.V., 2011-05-01)
A total of 15,901 scrotal circumference (SC) records from 5300 Nelore bulls, ranging from 229 to 560 days of age, were used with the objective of estimating (co)variance functions for SC, using random regression models. ...
Short communication: Principal components and factor analytic models for test-day milk yield in Brazilian Holstein cattle
(Elsevier B.V., 2012-04-01)
A total of 46,089 individual monthly test-day (TD) milk yields (10 test-days), from 7,331 complete first lactations of Holstein cattle were analyzed. A standard multivariate analysis (MV), reduced rank analyses fitting the ...
Genetic associations of conformation, finishing precocity and muscling visual scores with mature weight in Nelore cattle
(Elsevier B.V., 2011-02-01)
Were estimate (co)variance and genetic associations between conformation, finishing precocity and muscling visual scores measured at weaning (SCW, SFW and SMW, respectively) and yearling (SCY. SFY and SMY, respectively) ...