Research Article

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06/30/2007
Cubic spline; Genetic parameters; Random regression

Genetic parameters were estimated with restricted maximum likelihood for individual test-day milk, fat, and protein yields and somatic cell scores with a random regression cubic spline model. Test-day records of Holstein cows that calved from 1994 through early 1999 were obtained from Dairy Records Management Systems in Raleigh, North Carolina, for the analysis. Estimates of ... more

B.J. DeGroot; J.F. Keown; L.D. Van Vleck; S.D. Kachman
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Bovine somatotropin; Estimated breeding values; Genetic parameters; Milk yield ranking; Somatic cell score

Records of Holstein cows were used to examine how different models account for the effect of bovine somatotropin (bST) treatment on genetic evaluation of dairy sires for yield traits and somatic cell score. Data set 1 included 65,720 first-lactation records. Set 2 included 50,644 second-lactation records. Set 3 included 45,505 records for lactations three, four and five. Estimated ... more

A. Al-Seaf; J.F. Keown; L.D. Van Vleck
03/09/2007
Bovine somatotropin; Genetic parameters; Milk yield; Somatic cell score

Records of Holstein cows from the Dairy Records Processing Center at Raleigh, NC were edited to obtain three data sets: 65,720 first, 50,694 second, and 65,445 later lactations. Correlations among yield traits and somatic cell score were estimated with three different models: 1) bovine somatotropin (bST) administration ignored, 2) bST administration as a fixed effect and 3) ... more

A. Al-Seaf; J.F. Keown; L.D. Van Vleck
12/12/2006
Body structure; Frame scores; Genetic improvement; Genetic parameters; Nellore

Models for estimation of frame scores in Nellore beef cattle (FRAME_GMA) were developed, comparing them with frame scores estimated using equations proposed by the Beef Improvement Federation (FRAME_BIF, USA). Correlation among frame scores obtained by these two methodologies, along with the independent variables considered in the estimation models, were also studied. A data set with 12,728 ... more

A.R.V.R. Horimoto; J.B.S. Ferraz; J.C.C. Balieiro; J.P. Eler
09/01/2005
Dual-purpose cattle; Genetic parameters; Reproductive performance; Tropics

Data on productive and reproductive performance of cows in dual-purpose herds were analyzed to determine the effect of some environmental and genetic factors on saleable milk yield (SMY), lactation length (LL), daily saleable milk per lactation (DMYL), calving interval (CI), and daily saleable milk per calving interval (MYCI) in dual-purpose herds in Yucatan, Mexico. Repeatabilities (re ... more

G.M. Parra-Bracamonte; J.G. Magaña; R. Delgado; M.M. Osorio-Arce; J.C. Segura-Correa
11/10/2009
Abdominal fat pad; Correlation; Genetic parameters; Heritability; Sib test
L.G. Gaya
11/03/2009
Genetic correlations; Genetic parameters; Genetic trends; Heritability; Phenotypic correlations
L.G. Gaya
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
04/10/2013
Chili peppers; Genetic control of disease resistance; Genetic parameters; Heritability; Mean generation analysis

We investigated inheritance of resistance to Pepper yellow mosaic virus (PepYMV) in Capsicum baccatum var. pendulum accessions UENF 1616 (susceptible) crossed with UENF 1732 (resistant). Plants from generations P1, P2, F1, F2, BC1:1, and BC1:2 were inoculated and the symptoms were evaluated for 25 days. ... more

C.S. Bento; R. Rodrigues; L.S.A. Gonçalves; H.S. Oliveira; M.H. Santos; M.C. Pontes; C.P. Sudré
12/19/2012
Bayesian inference; Beef cattle; Fertility; Genetic parameters

We estimated heritability for subsequent rebreeding (SR) of heifers and genetic correlations between this trait and weaning weight (WW), weight gain from weaning to yearling (WG), age at first calving (AFC), and mature cow weight (MW), in order to evaluate whether SR could be included as selection criterion in Nellore cattle. The SR of heifers was defined by attributing a value of 1 ( ... more

A.A. Boligon; F. Baldi; L.G. Albuquerque

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