Zebu

Comparison of random regression models to estimate genetic parameters for milk production in Guzerat (Bos indicus) cows

D. J. A. Santos, Peixoto, M. G. C. D., Borquis, R. R. Aspilcueta, Verneque, R. S., Panetto, J. C. C., and Tonhati, H., Comparison of random regression models to estimate genetic parameters for milk production in Guzerat (Bos indicus) cows, vol. 12, pp. 143-153, 2013.

Random regression models have been widely used to estimate genetic parameters that influence milk production in Bos taurus breeds, and more recently in B. indicus breeds. With the aim of finding appropriate random regression model to analyze milk yield, different parametric functions were compared, applied to 20,524 test-day milk yield records of 2816 first-lactation Guzerat (B. indicus) cows in Brazilian herds.

Evaluation of TFAM and FABP4 gene polymorphisms in three lines of Nellore cattle selected for growth

D. R. Ayres, Souza, F. R. P., Mercadante, M. E. Z., Fonseca, L. F. S., Tonhati, H., Cyrillo, J. N. S. G., Bonilha, S. F. M., and Albuquerque, L. G., Evaluation of TFAM and FABP4 gene polymorphisms in three lines of Nellore cattle selected for growth, vol. 9, pp. 2050-2059, 2010.

We analyzed the polymorphisms TFAM HaeIII, TFAM MboI and FABP4 MspA1I in three Nellore lines selected for growth in order to evaluate how selection affects the frequencies of these polymorphisms and evaluate their association with growth and carcass traits in Zebu cattle. Birth, weaning and yearling weights, rump height, longissimus muscle area, backfat thickness, and rump fat thickness were analyzed.

Determination of ancestral proportions in synthetic bovine breeds using commonly employed microsatellite markers

H. M. S. Bicalho, Pimenta, C. G., Mendes, I. K. P., Pena, H. B., Queiroz, E. M., and Pena, S. D. J., Determination of ancestral proportions in synthetic bovine breeds using commonly employed microsatellite markers, vol. 5, pp. 432-437, 2006.

The International Society of Animal Genetics (ISAG) has chosen nine microsatellites (international marker set) as a standard that should be included in all cattle parentage studies. They are BM1824, BM2113, INRA023, SPS115, TGLA122, TGLA126, TGLA227, ETH10, and ETH225. We decided to ascertain whether this microsatellite set could be used to determine ancestral proportions in individual animals of synthetic breeds produced by crossing zebu and taurine cattle.

DGAT1 K232A polymorphism in Brazilian cattle breeds

G. A. Lacorte, Machado, M. A., Martinez, M. L., Campos, A. L., Maciel, R. P., Verneque, R. S., Teodoro, R. L., Peixoto, M. G. C. D., Carvalho, M. R. S., and Fonseca, C. G., DGAT1 K232A polymorphism in Brazilian cattle breeds, vol. 5, pp. 475-482, 2006.

Recent reports identified DGAT1 (EC 2.3.1.20) harboring a lysine to alanine substitution (K232A) as a candidate gene with a strong effect on milk production traits. Our objective was to estimate the frequency of the DGAT1 K232A polymorphism in the main Zebu and Taurine breeds in Brazil as well as in Zebu x Taurine crossbreds as a potential QTL for marker-assisted selection.

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