Genetic parameters

Estimating additive and dominance variances for complex traits in pigs combining genomic and pedigree information

E. V. Costa, Diniz, D. B., Veroneze, R., Resende, M. D. V., Azevedo, C. F., Guimarães, S. E. F., Silva, F. F., and Lopes, P. S., Estimating additive and dominance variances for complex traits in pigs combining genomic and pedigree information, vol. 14, pp. 6303-6311, 2015.

Knowledge of dominance effects should improve ge­netic evaluations, provide the accurate selection of purebred animals, and enable better breeding strategies, including the exploitation of het­erosis in crossbreeds. In this study, we combined genomic and pedi­gree data to study the relative importance of additive and dominance genetic variation in growth and carcass traits in an F2 pig population. Two GBLUP models were used, a model without a polygenic effect (ADM) and a model with a polygenic effect (ADMP).

Genetic analysis of fleece and post-weaning body weight traits in Makuie sheep

S. Jafari and Hashemi, A., Genetic analysis of fleece and post-weaning body weight traits in Makuie sheep, vol. 13, pp. 1079-1087, 2014.

Estimation of genetic parameters is the most important component of an organized selection program. With respect to economic traits, such as wool and mutton traits, production costs can be reduced through a suitable selection program focused on genetic improvement. This study aimed to evaluate genetic parameters of fleece and post-weaning growth traits in sheep. Greasy fleece weight at 6, 16, 28, 40, and 52 months of age (GFW1, GFW2, GFW3, GFW4, and GFW5) represented characteristics of wool quantity.

(Co)variance components and genetic parameters for growth traits in Arabi sheep using different animal models

B. Shokrollahi and Baneh, H., (Co)variance components and genetic parameters for growth traits in Arabi sheep using different animal models, vol. 11, pp. 305-314, 2012.

The objective of the present study was to estimate genetic parameters for body weight at different ages in Arabi sheep using data collected from 1999 to 2009. Investigated traits consisted of birth weight (N = 2776), weaning weight (N = 2002) and weight at six months of age (N = 1885). The data were analyzed using restricted maximum likelihood analysis, by fitting univariate and multivariate animal models. All three weight traits were significantly influenced by birth year, sex and birth type. Age of dam only significantly affected birth weight.

Milk yield persistency in Brazilian Gyr cattle based on a random regression model

R. J. Pereira, Verneque, R. S., Lopes, P. S., Santana, Jr., M. L., Lagrotta, M. R., Torres, R. A., Filho, A. E. Vercesi, and Machado, M. A., Milk yield persistency in Brazilian Gyr cattle based on a random regression model, vol. 11, pp. 1599-1609, 2012.

With the objective of evaluating measures of milk yield persistency, 27,000 test-day milk yield records from 3362 first lactations of Brazilian Gyr cows that calved between 1990 and 2007 were analyzed with a random regression model. Random, additive genetic and permanent environmental effects were modeled using Legendre polynomials of order 4 and 5, respectively. Residual variance was modeled using five classes. The average lactation curve was modeled using a fourth-order Legendre polynomial. Heritability estimates for measures of persistency ranged from 0.10 to 0.25.

Genetic correlations between heifer subsequent rebreeding and age at first calving and growth traits in Nellore cattle by Bayesian inference

A. A. Boligon, Baldi, F., and Albuquerque, L. G., Genetic correlations between heifer subsequent rebreeding and age at first calving and growth traits in Nellore cattle by Bayesian inference, vol. 11, pp. 4516-4524, 2012.

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 (success) or 0 (failure) to heifers that calved or not, respectively, given that they had calved once before. Records from 127,430 Nellore animals were analyzed.

Inheritance of resistance to Pepper yellow mosaic virus in Capsicum baccatum var. pendulum

C. S. Bento, Rodrigues, R., Gonçalves, L. S. A., Oliveira, H. S., Santos, M. H., Pontes, M. C., and Sudré, C. P., Inheritance of resistance to Pepper yellow mosaic virus in Capsicum baccatum var. pendulum, vol. 12, pp. 1074-1082, 2013.

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. Subsequently, an area under the disease progress curve was calculated and subjected to generation means analysis. Only the average and epistatic effects were significant.

Breeding value accuracy estimates for growth traits using random regression and multi-trait models in Nelore cattle

A. A. Boligon, Baldi, F., Mercadante, M. E. Z., Lôbo, R. B., Pereira, R. J., and Albuquerque, L. G., Breeding value accuracy estimates for growth traits using random regression and multi-trait models in Nelore cattle, vol. 10, pp. 1227-1236, 2011.

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 regression analyses, all female weight records from birth to eight years of age (data set I) were considered.

Genetic and non-genetic effects on productive and reproductive traits of cows in dual-purpose herds in southeastern Mexico

G. M. Parra-Bracamonte, Magaña, J. G., Delgado, R., Osorio-Arce, M. M., and Segura-Correa, J. C., Genetic and non-genetic effects on productive and reproductive traits of cows in dual-purpose herds in southeastern Mexico, vol. 4, pp. 482-490, 2005.

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) for these traits were also estimated. Data were obtained from monthly visits to 162 herds from 1996 to 2000.

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