Research Article

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Beef cattle; Genetic and phenotypic correlation; Heritability; Maternal effect; Suizo cattle; Weight gain

The objective of this study was to estimate genetic parameters for pre-weaning traits of Braunvieh cattle raised under tropical conditions in Brazil. The weight and weight gain parameters were birth weight (BW, N = 9955), weight at 120 days of age (W120, N = 5901), weaning weight at 205 days (WW, N = 6970), weight gain from birth to 205 days (GAIN205, N = 6013), weight gain from birth to 120 ... more

D.C. Cucco; J.B.S. Ferraz; L.F.B. Pinto; J.P. Eler; J.C.C. Balieiro; E.C. Mattos
03/23/2010
Beef cattle; Genetic and phenotypic correlations; Heritability; Maternal effect; Swiss cattle; Weight gain

Genetic parameters for traits related to postweaning growth in Braunvieh cattle, reared under tropical and sub-tropical conditions in Brazil, were studied. Weight traits were weight at 365 days of age (W365, N = 4055), at 450 days (W450, N = 3453), and at 550 days (W550, N = 1946), while weight gains were gain from weaning to 365 days of age (WGW365, N = 3060), from weaning to 450 days ( ... more

D.C. Cucco; J.B.S. Ferraz; J.P. Eler; J.C.C. Balieiro; E.C. Mattos; L. Varona
06/20/2007
Heritability; Honey bee; Pollen collection; Selection; Sunflower

We selected honey bee colonies (Apis mellifera L.) with a high tendency to collect sunflower pollen and estimated the heritability of this trait. The percentage of sunflower pollen collected by 74 colonies was evaluated. Five colonies that collected the highest percentages of sunflower pollen were selected. Nineteen colonies headed by daughters of these selected queens were evaluated ... more

M. Basualdo; E.M. Rodríguez; E. Bedascarrasbure; D. De Jong
09/30/2007
Behavior; Competition effects; Heritability; Review; Swine

A review of previous studies is presented on estimates of genetic parameters and responses to selection with traditional breeding approaches, on correlations between agonistic behavior and growth performance, and on theoretical frameworks for selection incorporating interactions among individuals and on practical methods for incorporating competition effects in breeding programs.

C.Y. Chen; R.K. Johnson; L.D. Van Vleck; S. Newman
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Biometric traits; Heritability; Horse; Murgese

A data set concerning 1,816 subjects entered in the Italian Horse Registry from 1925 to 2002 was analyzed to investigate the morphological evolution of the Murgese horse and to obtain useful elements to enhance breeding practices. Three basic body measurements (height at withers, chest girth, and cannon bone circumference) were considered for each subject. Heritabilities were ... more

C. Dario; D. Carnicella; M. Dario; G. Bufano
03/11/2008
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
12/14/2011
Genetic correlation; Heritability; Repeatability; Selection

Data from 1279 lactations of 783 Alpine and Saanen goats of the herd of our university in Minas Gerais, Brazil, were used to study environmental effects on and to estimate genetic parameters for milk production until 270 days of lactation (MP270) and for production and percentages of fat (PFAT and %FAT), protein (PPROT and %PROT), lactose (PLACT and %LACT), and total dry extract (PEXTR ... more

L.F. Brito; F.G. Silva; A.L.P. Melo; G.C. Caetano; R.A. Torres; M.T. Rodrigues; G.R.O. Menezes
12/08/2011
Cluster; Genetic variability; Heritability; Parental selection; Principal component analysis

We characterized 13 accessions of dry peas of different origins from various growing regions in Argentina, based on three replications of 20 plants cultivated in 2009 and 2010 in a greenhouse, with the objective of selecting those with favorable characteristics for use in breeding programs. Significant differences were found for length and width of stipule and pod, length of the ... more

I. Gatti; M.A. Espósito; P. Almirón; V.P. Cravero; E.L. Cointry
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Carcass traits; Heritability; Repeatability; Ultrasound

Real-time ultrasound is currently used for in vivo carcass evaluation of beef cattle. We estimated heritability and repeatability coefficients for ultrasound-measured carcass traits in Nelore cattle. We measured longissimus muscle area, backfat thickness, and rump fat thickness in male and female animals ranging in age from 10 to 26 months. The variance components were estimated ... more

T.R. Pinheiro; M.E.Z. Mercadante; L.G. Albuquerque; J.N.S.G. Cyrillo; R.H. Branco
11/04/2011
Heritability; Multitrait model; Non-genetic factors; Repeatability

We examined the effects of environmental and genetic factors on the weaning-to-estrus interval (WEI) in sows. In order to perform the analyses of the environmental factors, 8104 observations of the 1st to the 6th WEI were carried out, while 6548 observations of the 1st to the 3rd WEI were carried out for the analyses of genetic factors. The environmental model included as fixed effects, ... more

C.D.S. Leite; J.F. Lui; L.G. Albuquerque; D.N.M. Alves

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