Research Article

Related GMR Articles

06/28/2011
B-spline functions; Genetic parameters; Legendre polynomials; Multi-trait model; Random regression models; Rank correlations

We quantified the potential increase in accuracy of expected breeding value for weights of Nelore cattle, from birth to mature age, using multi-trait and random regression models on Legendre polynomials and B-spline functions. A total of 87,712 weight records from 8144 females were used, recorded every three months from birth to mature age from the Nelore Brazil Program. For random ... more

A.A. Boligon; F. Baldi; M.E.Z. Mercadante; R.B. Lôbo; R.J. Pereira; L.G. Albuquerque
06/29/2015
Beef cattle; Legendre polynomials; Scrotal circumference; Yearling weight

The objective of this study was to quantify the magnitude of genotype-environment interaction (GxE) effects on age at first calving (AFC), scrotal circumference (SC), and yearling weight (YW) in Nellore cattle using reaction norms. For the study, 89,152 weight records of female and male Nellore animals obtained at yearling age were used. Genetic parameters were estimated with a single- ... more

M.V.A. Lemos; H.L.J. Chiaia; M.P. Berton; F.L.B. Feitosa; C. Aboujaoude; G.C. Venturini; H.N. Oliveira; L.G. Albuquerque; F. Baldi
07/24/2013
Legendre polynomials; Percentage of in common disposal; Spearman correlation

The objective of this study was to compare the results of genetic evaluations by using different milk control intervals to reduce the cost of milk yield controls without harming the quality of genetic evaluation of the animals. We analyzed test day milk yield data from the Goat Sector of Universidade Federal de Viçosa. After editing and checking for errors in the database, there were 20, ... more

F.G. Silva; R.A. Torres; L.F. Brito; L.P. Silva; G.R.O. Menezes; L.C. Brito; R.F. Euclydes; M.T. Rodrigues
05/13/2013
Breeding value; Coturnix coturnix; Legendre polynomials; Runge’s phenomenon

Data from 8759 meat-type quails from the UFV1 strain and 9128 from the UFV2 strain were used to assess the possibility of reducing the number of body weight records in genetic evaluations. The evaluated animals were weighed weekly since hatching to the 6th week of life, with up to 7 records of body weight for each bird. The data were evaluated by random regression models, with 9 ... more

L.P. Silva; J.C. Ribeiro; C.D.S. Leite; M.F. Sousa; C.M. Bonafé; G.C. Caetano; A.C. Crispim; R.A. Torres
09/27/2013
Factor analysis; Milk production; Principal components

We analyzed 46,161 monthly test-day records of milk production from 7453 first lactations of crossbred dairy Gyr (Bos indicus) x Holstein cows. The following seven models were compared: standard multivariate model (M10), three reduced rank models fitting the first 2, 3, or 4 genetic principal components, and three models considering a 2-, 3-, or 4-factor structure for the genetic ... more

R.J. Pereira; D.R. Ayres; E. Faro; R.S. Verneque; A.E.Vercesi Filho; L.G. Albuquerque
11/27/2014
Conformation; environment; Feet and legs; Milk production; Type traits; Udder

The aim of this study was to analyze the relationship between environmental and genetic values for milk production and type traits in Holstein cattle in Brazil. The genetic value of 65,383 animals for milk production and 53,626 for type classification were available. Socioeconomic and environmental data were obtained from the Brazilian Institute of Geography and Statistics, the Food and ... more

N.S. Costa; P. Hermuche; J.A. Cobuci; S.R. Paiva; R.F. Guimaraes; O.A. Carvalho; R.A.T. Gomes; C.N. Costa; C.M. McManus
03/30/2015
Acyl-CoA:diacylglycerol acyltransferase 1 gene; Beta-lactoglobulin gene; Casein gene family; Growth hormone gene; Luteinizing hormone receptor gene; Milk production

The objectives of this study were to determine the effects of a single gene and composite genotype of the casein gene family, including the beta-lactoglobulin gene (beta-LGB), acyl-CoA: diacylglycerol acyltransferase 1 gene (DGAT1), growth hormone gene (GH), and luteinizing hormone receptor gene (LHR) on milk yield, milk composition, the percentage of fat, ... more

A. Molee; C. Poompramun; P. Mernkrathoke