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Animal Genetics   Research Article

Candidate genes for production traits in Nelore beef cattle

Authors: P.C. Tizioto S.L. Meirelles R.R. Tulio A.N. Rosa M.M. Alencar S.R. Medeiros F. Siqueira G.L.D. Feijó L.O.C. Silva R.A.A. Torres Júnior L.C.A. Regitano

Meat quality is an important trait for the beef industry. Backfat thickness, ribeye area, and shear force are traits measured late in life, and the investigation of molecular markers associated with these traits can help breeding programs. In cattle, some polymorphisms have been related to production traits. Thus, the purpose of this study was to assess t.. Read More»

Genet. Mol. Res. 11(4):
Plant Genetics   Research Article

Carcass and meat quality traits in Nellore and F1 Nellore-Araguaia crosses

Authors: N.V. Costa, C. Aboujaoude, G.S. Vieira, V.V. Paiva, R.A. Moraes Neto,V.S. Gondim, L.R. Alves, M.C.L. Torres and R.C. Antunes

We evaluated and compared carcass traits and meat quality in Nellore cattle and F1 crosses between Nellore and Araguaia, where 17 individuals were from the Nellore group and 19 were ½ Nellore and ½ Araguaia crosses. All animals belonged to the same birth season and were raised in pasture systems under the same nutritional, environmental, and.. Read More»

Genet. Mol. Res. 14(2):
Animal Genetics   Research Article

Survival of the thriftiest: restricted nurture reveals the thrifty nature of a growth gene in Bos indicus

Authors: S.U. Dani, M.A.C. Dani, I.L. Freire, S.P. Gouvea, F.B. Knackfuss, F.P. Lima, M.E.Z. Mercadante, E. Monteiro, S.M.G. Paggiaro, A.G. Razook and H.C. Yehia

Growth hormone (GH) is a part of the somatotropic axis that controls metabolism, growth, development and aging in a wide range of animals. Mutations that reduce GH signaling have been associated with extended life spans and increased longevity in ways similar to what is observed in dietary restriction (DR) models. However, the.. Read More»

Genet. Mol. Res. 9(2):
Animal Genetics   Research Article

Synergistic and threshold effects of GH1 and GHR promoter size variation on body growth and fat accrual in young Nelore (Bos indicus) bulls

Authors: M.A. Dani, M. von Cube, I.L. Freire, L. Suguisawa, C. Fischer, S.U. Dani

A synergistic effect in the somatotropic axis (GH1-GHR-IGF1) was observed in 736 young Nelore (Bos indicus) bulls under ad libitum grass feeding conditions on irrigated pasture in central Brazil. Stepwise substitution of shorter alleles of the promoter region of the growth hormone gene (GH1) and the P1 promoter of the GH1 rece.. Read More»

Genet. Mol. Res. 11(2):
Animal Genetics   Research Article

Karyotype analysis of mithun (Bos frontalis) and mithun bull x Brahman cow hybrids

Authors: K.-X. Qu, Z.-X. He, W.-H. Nie, J.-C. Zhang, X.-D. Jin, G.-R. Yang, X.-P. Yuan, B.-Z. Huang, Y.-P. Zhang and L.-S. Zan

We examined the cytogenetics of mithun (Bos frontalis), a domesticated version of the Asian gaur, and hybrids (F1 generation) produced by artificial insemination of Brahman cows (Bos indicus) with mithun semen. Reproductive potential was also examined in the F1 generation and a backcrossed heifer for utilization of heterosis. .. Read More»

Genet. Mol. Res. 11(1):
Animal Genetics   Research Article

Association of polymorphisms in growth hormone and leptin candidate genes with live weight traits of Brahman cattle

Authors: N. Hernández, J.C. Martínez-González, G.M. Parra-Bracamonte, A.M. Sifuentes-Rincón, N. López-Villalobos, S.T. Morris, F. Briones-Encinia, E. Ortega-Rivas, V.I. Pacheco-Contreras and L.A. Meza-García

Polymorphisms in candidate genes can produce significant and favorable changes in the phenotype, and therefore are useful for the identification of the best combination of favorable variantsfor marker-assisted selection. In the present study, an assessment to evaluate the effect of 11 single nucleotide polymorphisms (SNPs) in .. Read More»

Genet. Mol. Res. 15(3):
Microbial Genetics   Research Article

Protein synthesis and degradation gene SNPs related to feed intake, feed efficiency, growth, and ultrasound carcass traits in Nellore cattle

Authors: R.C. Gomes, S.L. Silva, M.E. Carvalho, F.M. Rezende, L.F.B. Pinto, M.H.A. Santana, T.R. Stella, F.V. Meirelles, P. Rossi Júnior, P.R. Leme and J.B.S. Ferraz

We looked for possible associations of SNPs in genes related to protein turnover, with growth, feed efficiency and carcass traits in feedlot Nellore cattle. Purebred Nellore bulls and steers (N = 290; 378 ± 42 kg body weight, 23 months ± 42 days old) were evaluated for daily feed intake, body weight gain (BWG), gross feed efficiency, feed co.. Read More»

Genet. Mol. Res. 12(3):
Animal Genetics   Research Article

Additive genetic relationship of longevity with fertility and production traits in Nellore cattle based on bivariate models

Authors: M.H. Van Melis, H.N. Oliveira, J.P. Eler, J.B.S. Ferraz, J. Casellas and L. Varona

Survival or longevity is an economically important trait in beef cattle. The main inconvenience for its inclusion in selection criteria is delayed recording of phenotypic data and the high computational demand for including survival in proportional hazard models. Thus, identification of a longevity-correlated trait that could .. Read More»

Genet. Mol. Res. 9(1):
Human Genetics   Research Article

Single nucleotide polymorphisms associated with carcass traits in a population of Brahman and Brahman-influenced steers

Authors: A.M. Royer, C. Shivers, D.G. Riley, M.A. Elzo and M.D. Garcia

Brahman cattle are important in tropical regions due to their ability to tolerate excessive heat and parasites. However, Brahman cattle exhibit lower carcass quality characteristics when compared to Bos taurus breeds. The objective of this study was to evaluate potential associations between single nucleotide polymorphisms (SN.. Read More»

Genet. Mol. Res. 15(2):
Animal Genetics   Research Article

A single nucleotide polymorphism in NEUROD1 is associated with production traits in Nelore beef cattle

Authors: P.S.N. de Oliveira, P.C. Tizioto, W. Malago Jr, M.L. do Nascimento, A.S.M. Cesar, W.J.S. Diniz, M.M. de Souza, D.P.D. Lanna, R.R. Tullio, G.B. Mourão, M. de A. Mudadu, L.L. Coutinho and L.C. de A. Regitano

Feed efficiency and carcass characteristics are late-measured traits. The detection of molecular markers associated with them can help breeding programs to select animals early in life, and to predict breeding values with high accuracy. The objective of this study was to identify polymorphisms in the functional and positional .. Read More»

Genet. Mol. Res. 15(2):