Nellore

Genome-wide association with residual body weight gain in Bos indicus cattle

M. H. A. Santana, Gomes, R. C., Utsunomiya, Y. T., Neves, H. H. R., Novais, F. J., Bonin, M. N., Fukumasu, H., Garcia, J. F., Alexandre, P. A., Junior, G. A. Oliveira, Coutinho, L. L., and Ferraz, J. B. S., Genome-wide association with residual body weight gain in Bos indicus cattle, vol. 14. pp. 5229-5233, 2015.

Weight gain is a key performance trait for beef cat­tle; however, attention should be given to the production costs for better profitability. Therefore, a feed efficiency trait based on per­formance can be an interesting approach to improve performance without increasing food costs. To identify candidate genes and ge­nomic regions associated with residual body weight gain (RWG), we conducted a genome-wide association study (GWAS) with 720 Nellore cattle using the GRAMMAR-Gamma association test.

Phenotypic and genetic correlations for body structure scores (frame) with productive traits and index for CEIP classification in Nellore beef cattle

A. R. V. R. Horimoto, Ferraz, J. B. S., Balieiro, J. C. C., and Eler, J. P., Phenotypic and genetic correlations for body structure scores (frame) with productive traits and index for CEIP classification in Nellore beef cattle, vol. 6, pp. 188-196, 2007.

The present study was carried out to estimate both (co)variance components and genetic parameters for frame scores obtained using two methods (FRAME_GMA and FRAME_BIF) as well as phenotypic and genetic correlations with traits such as weaning weight, weight gain from weaning to yearling, scrotal circumference, muscle score, and an empiric index for animal classification for the Special Certificate of Identification and Production (CEIP). Data on 12,728 animals, raised in Southeastern Brazil, with ages from 490 to 610 days were analyzed.

Estimation of genetic parameters for a new model for defining body structure scores (frame scores) in Nellore cattle

A. R. V. R. Horimoto, Ferraz, J. B. S., Balieiro, J. C. C., and Eler, J. P., Estimation of genetic parameters for a new model for defining body structure scores (frame scores) in Nellore cattle, vol. 5, pp. 828-836, 2006.

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 animals, with ages between 490 and 610 days, was used. The models that best adjusted to FRAME_GMA included hip height, weight and interaction between height and weight.

Pedigree analyses in the Breeding Program for Nellore Cattle

P. A. Vozzi, Marcondes, C. R., Bezerra, L. A. F., and Lôbo, R. B., Pedigree analyses in the Breeding Program for Nellore Cattle, vol. 6, pp. 1044-1050, 2007.

Parameters based on the probability of gene origin were used to describe genetic variability in three reproductive groups from the Breeding Program for Nellore Cattle (PMGRN). The three reproductive populations (cows in reproductive age, bulls from artificial insemination centers and young bulls in progeny test) generated medium to low values.

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