Authors: P.C. Tizioto S.L. Meirelles R.R. Tulio A.N. Rosa M.M. Alencar S.R. Medeiros F. Siqueira G.L.D. Feij�³ L.O.C. Silva R.A.A. Torres J�ºnior 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»
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»
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»
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»
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»
Authors: N. HernÃ?¡ndez, J.C. MartÃ?Ânez-GonzÃ?¡lez, G.M. Parra-Bracamonte, A.M. Sifuentes-RincÃ?³n, N. LÃ?³pez-Villalobos, S.T. Morris, F. Briones-Encinia, E. Ortega-Rivas, V.I. Pacheco-Contreras and L.A. Meza-GarcÃ?Âa
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»
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 J�ºnior, 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»
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»
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»
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. Mour�£o, 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»