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| Registros recuperados: 717 | |
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| Prieto Cornejo, María del Rocío. |
| La producción de ganado bovino para carne en México es una de las más importantes actividades ganaderas del país sin embargo hemos visto que el mercado de consumo de este producto está siendo suministrado especialmente por las importaciones de Estados Unidos. Se aplicaron encuestas en el municipio de Tepetlaoxtoc para analizar que tan competitivos son nuestros productores y ver cuáles son las principales desventajas a las que se enfrentan, los resultados fueron que todas las unidades de producción son rentables y competitivas a precios privados,es decir, que el valor agregado que generan cubre todos los costos de los factores internos de la producción y presentan una ganancia extraordinaria. Pero no todas las unidades de producción presentan ventajas... |
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Palavras-chave: Análisis; Bovinos Carne; Competitivos; Rentables; Valor agregado; Analysis; Beef cattle; Competitive; Profitable; Value-added; Maestría; Economía. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/392 |
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| Prieto Cornejo, María del Rocío. |
| La producción de ganado bovino para carne en México es una de las más importantes actividades ganaderas del país sin embargo hemos visto que el mercado de consumo de este producto está siendo suministrado especialmente por las importaciones de Estados Unidos. Se aplicaron encuestas en el municipio de Tepetlaoxtoc para analizar que tan competitivos son nuestros productores y ver cuáles son las principales desventajas a las que se enfrentan, los resultados fueron que todas las unidades de producción son rentables y competitivas a precios privados,es decir, que el valor agregado que generan cubre todos los costos de los factores internos de la producción y presentan una ganancia extraordinaria. Pero no todas las unidades de producción presentan ventajas... |
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Palavras-chave: Análisis; Bovinos Carne; Competitivos; Rentables; Valor agregado; Analysis; Beef cattle; Competitive; Profitable; Value-added; Maestría; Economía. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/392 |
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| Almora Bustos, Isael. |
| El presente trabajo analiza la competitividad comercial de carne de ganado bovino entre los países miembros del Tratado de Libre comercio de América del Norte (TLCAN): México, Canadá y Estados Unidos. La metodología utilizada es mediante indicadores de mercado: participación de mercado, coeficiente de ventaja comparativa revelada (CVCR), tasa de penetración de las importaciones (TPI) y producción expuesta a la competencia (PEC), para ello se utilizan datos del periodo 1997-2008, comparando los valores promedio de 1997 a 1999 contra los valores promedio de 2006 a 2008. Esto permite observar el desarrollo de la competitividad de los 3 socios comerciales a nivel mundial y permite evaluar la competitividad de Canadá y México como principales proveedores de... |
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Palavras-chave: Carne de ganado bovino; Competitividad; TLCAN; Comercialización; Beef cattle; Competitiveness; NAFTA; Marketing; Maestría; Economía. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/552 |
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| Almora Bustos, Isael. |
| El presente trabajo analiza la competitividad comercial de carne de ganado bovino entre los países miembros del Tratado de Libre comercio de América del Norte (TLCAN): México, Canadá y Estados Unidos. La metodología utilizada es mediante indicadores de mercado: participación de mercado, coeficiente de ventaja comparativa revelada (CVCR), tasa de penetración de las importaciones (TPI) y producción expuesta a la competencia (PEC), para ello se utilizan datos del periodo 1997-2008, comparando los valores promedio de 1997 a 1999 contra los valores promedio de 2006 a 2008. Esto permite observar el desarrollo de la competitividad de los 3 socios comerciales a nivel mundial y permite evaluar la competitividad de Canadá y México como principales proveedores de... |
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Palavras-chave: Carne de ganado bovino; Competitividad; TLCAN; Comercialización; Beef cattle; Competitiveness; NAFTA; Marketing; Maestría; Economía. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/552 |
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| Curi,Rogério A.; Palmieri,Darío A.; Suguisawa,Liliane; Oliveira,Henrique N. de; Silveira,Antonio C.; Lopes,Catalina R.. |
| The objectives of the present study were to estimate the allele and genotype frequencies of the GH1/Alu I and POU1F1/Hinf I polymorphisms in beef cattle belonging to different genetic groups and to determine the effects of these polymorphisms on growth and carcass traits in cattle submitted to feedlot management, an intensive production model. Genotyping was performed on 384 animals, including 79 Nellore, 30 Canchim (5/8 Charolais + 3/8 Zebu), 30 Simmental x Nellore crossbred and 245 Angus x Nellore crossbred cattle. Body weight, weight gain, dressing percentage, Longissimus dorsi area and backfat thickness were fitted using the General Linear Model (GLM) procedure of the SAS program and the least square means of the genotypes were compared using the F... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Polymorphisms; Candidate gene; Growth; Carcass. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000100012 |
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| Miquel,María C.; Villarreal,Edgardo; Mezzadra,Carlos; Melucci,Lilia; Soria,Liliana; Corva,Pablo; Schor,Alejandro. |
| The objective of this paper was to determine the association of a SNP in the µ-calpain gene at position 316 with growth and quality of meat traits of steers grown on pasture. Fifty-nine Brangus and 20 Angus steers were genotyped for CAPN1 316. Warner Bratzler shear force was measured in l. lumborum samples after a 7-day aging period. A multivariate analysis of variance was performed, including shear force (WBSF), final weight (FW), average daily gain (ADG), backfat thickness (BFT), average monthly fat thickness gain (AMFTG), rib-eye area (REA), and beef rib-eye depth (RED) as dependent variables. The CAPN1 316 genotype was statistically significant. Univariate analyses were done with these variables. The marker genotype was statistically significant (p... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Tenderness; Growth; Molecular marker; Multivariate analysis. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000300011 |
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| Boligon,Arione Augusti; Baldi,Fernando; Albuquerque,Lucia Galvão de. |
| Records from 106,212 Nellore animals, born between 1998 and 2006, were used to estimate (co)variance components and genetic parameters for birth weight (BW), average weight gains from birth to weaning (GBW), average weight gains from weaning to after yearling (GWAY), weaning hip height (WHH), postweaning hip height (PHH) and scrotal circumferences at 9 (SC9), 12 (SC12) and 15 (SC15) months of age. (Co)variance components were estimated by an animal model using multi-trait analysis. Heritability estimates for BW, GBW, GWAY, WHH, PHH, SC9, SC12 and SC15 were 0.31 ± 0.01; 0.25 ± 0.02; 0.30 ± 0.04; 0.51 ± 0.04; 0.54 ± 0.04; 0.39 ± 0.01; 0.41 ± 0.01 and 0.44 ± 0.02, respectively. Genetic correlations between growth traits ranged from 0.09 ± 0.01 to 0.88 ± 0.01,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Genetic correlation; Hip height; Average weight gain. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000200010 |
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| Curi,Rogério A.; Oliveira,Henrique N. de; Gimenes,Marcos A.; Silveira,Antonio C.; Lopes,Catalina R.. |
| The objective of the present study was to estimate the allele and genotype frequencies of the CSN3/HinfI and LGB/HaeIII gene polymorphisms in beef cattle belonging to different genetic groups, and to determine the effects of these polymorphisms on growth and carcass traits in these animals, which are submitted to an intensive production model. Genotyping was performed on 79 Nelore, 30 Canchim (5/8 Charolais + 3/8 Zebu) and 275 crossbred cattle originating from the crosses of Simmental (n = 30) and Angus (n = 245) sires with Nelore females. Body weight, weight gain, dressing percentage, longissimus dorsi area and backfat thickness were fitted using the GLM procedure, and least square means of the genotypes were compared by the F test. The results showed... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Beef cattle; Polymorphisms; Candidate gene; Growth; Carcass. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000200015 |
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| Silveira,Luiz Guilherme G.; Furlan,Luiz R.; Curi,Rogério A.; Ferraz,André Luiz J.; Alencar,Maurício M. de; Regitano,Luciana C.A.; Martins,Cyntia L.; Arrigoni,Mário de Beni; Suguisawa,Liliane; Silveira,Antônio C.; Oliveira,Henrique N. de. |
| The growth hormone 1 gene (GH1) is a candidate gene for body weight and weight gain in cattle since it plays a fundamental role in growth regulation. We investigated the GH1 gene AluI and DdeI restriction enzyme polymorphisms, located 149 bp apart in the cattle genome, as possible markers of the production potential of Canchim crossbreed cattle, a 5/8 Charolais (Bos taurus) and 3/8 Nelore (Bos indicus) breed developed in Brazil, by evaluating the birth weight, weaning weight, yearling weight and plasma insulin-like growth factor-1 (IGF-1) concentration of 7 month to 10 months old Canchim calves (n = 204) of known genealogy and which had been genotyped for the AluI and DdeI markers. Our results showed significant effect (p < 0.05) between the homozygous... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Polymorphism; Growth hormone; Candidate gene. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500012 |
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| Henkes,Luiz Ernani; Silva Jr,Wilson Araújo; Moraes,José Carlos Ferrugem; Weimer,Tania Azevedo. |
| The genetic diversity of 277 nucleotides in the mitochondrial DNA control region (nt 15,964 to 16,240 in reference sequence) was analyzed in crossbreed beef cattle (Brangus-Ibage, 5/8 Bos primigenius taurus x 3/8 Bos primigenius indicus) as well as in some Nellore samples (B. p. indicus). Fifty-seven mutations were found in Brangus-Ibage comprising 18 haplotypes (haplotype diversity, h = 0.851 ± 0.041 and nucleotide diversity, ntd = 0.009 ± 0.006) and 66 in Nellore (h = 1.00 ± 0.27, ntd = 0.014 ± 0.012). These data indicated sequence identities of 99.6 and 92.1% between the B. p. taurus' reference sequence and Brangus-Ibage and Nellore, respectively. The comparison of our data with sequence data for 612 individuals recovered from GenBank showed a total of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bovine mtDNA; Maternal lineage; Sequence analysis; Beef cattle; Genetic diversity. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100011 |
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| Silva,Ana Mary da; Alencar,Maurício Mello de; Regitano,Luciana Correia de Almeida; Oliveira,Márcia Cristina de Sena; Barioni Júnior,Waldomiro. |
| Resistance of beef cattle heifers to the cattle tick Boophilus microplus was evaluated by artificial infestation of 66 beef cattle heifers of the following genetic groups: 16 Nelore (NE), 18 Canchim x Nelore (CN), 16 Angus x Nelore (AN) and 16 Simmental x Nelore (SN). The animals, with a mean age of 16.5 months, were maintained with no chemical tick control in a Brachiaria decumbens pasture. Four artificial infestations with 20,000 B. microplus larvae were carried out 14 days apart and from day 18 to day 22 of each infestation the number of engorged female ticks (> 4.5 mm) was counted on the left side of each heifer. Data were analyzed as the percentage of return (PR = percentage of ticks counted relative to the number infested), transformed to (PR)¼,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Crossbred; Tick resistance. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600020 |
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| Mezzadra,Carlos Alberto; Melucci,Lilia Magdalena; Corva,Pablo Marcelo; López Valiente,Sebastián; Rípoli,María Verónica; Lirón,Pedro; Giovambattista,Guillermo. |
| The influence of cytoplasmic inheritance on birth and weaning weight was evaluated in an experimental Hereford herd. Data on 1,720 records for birth and weaning weights from calves born between 1963 and 2002 were studied. Variance components were estimated using MTDFREML procedures and an animal model was fitted for each trait. Direct and maternal additive effects and permanent environment and maternal lineage effects were treated as random, while year and month of birth, age of dam and sex of the calf were treated as fixed. Identification of maternal lineages was based on pedigree information. The contribution to phenotypic variance of cytoplasmic lineages defined by pedigree information was negligible for both traits. Mitochondrial genotypes of cows... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Hereford; Birth weight; Weaning weight; Cytoplasmic inheritance; SSCP. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000300003 |
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| Corva,Pablo; Soria,Liliana; Schor,Alejandro; Villarreal,Edgardo; Cenci,Macarena Pérez; Motter,Mariana; Mezzadra,Carlos; Melucci,Lilia; Miquel,Cristina; Paván,Enrique; Depetris,Gustavo; Santini,Francisco; Naón,Juan Grigera. |
| The activity of the calpains/calpastatin proteolytic system is closely related to the postmortem tenderization of meat. We investigated the association between beef tenderness and single nucleotide polymorphism (SNP) markers on the CAPN1 gene (SNP316, alleles C/G; SNP530 alleles A/G) and the CAST gene 3' untranslated region (SNP2870, alleles A/G). We sampled nine slaughter groups comprising 313 steers which had been reared in beef production systems in Argentina between 2002 and 2004 from crosses between Angus, Hereford and Limousin cattle. Minor allele frequencies for the markers were 0.27 to 0.46 (C), 0.02 to 0.18 (A), and 0.24 to 0.53 (A), respectively. The presence of CAPN1 markers had significant effects on meat shear force but no detectable effects... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; CAPN1; CAST; Genetic markers; Meat quality. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600006 |
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| Fortes,Marina R.S.; Curi,Rogério A.; Chardulo,Luis Artur L.; Silveira,Antonio C.; Assumpção,Mayra E.O.D.; Visintin,José Antonio; Oliveira,Henrique N. de. |
| Leptin, thyroglobulin and diacylglycerol O-acyltransferase play important roles in fat metabolism. Fat deposition has an influence on meat quality and consumers' choice. The aim of this study was to determine allele and genotype frequencies of polymorphisms of the bovine genes, which encode leptin (LEP), thyroglobulin (TG) and diacylglycerol O-acyltransferase (DGAT1). A further objective was to establish the effects of these polymorphisms on meat characteristics. We genotyped 147 animals belonging to the Nelore (Bos indicus), Canchim (5/8 Bos taurus + 3/8 Bos indicus), Rubia Gallega X Nelore (1/2 Bos taurus + 1/2 Bos indicus), Brangus Three-way cross (9/16 Bos taurus + 7/16 Bos indicus) and Braunvieh Three-way cross (3/4 Bos taurus + 1/4 Bos indicus)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bovine gene polymorphisms; Candidate gene; Fat deposition; Beef cattle. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000100011 |
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| Souza,Fabio Ricardo Pablos de; Vozzi,Pedro Alejandro; Vila,Reginaldo Aparecido; Boligon,Arione Augusti; Galerani,Marli Aparecida Vani; Lobo,Raysildo Barbosa; Martelli,Lucia Regina. |
| MUC1 is a heavily glycosylated mammalian transmembrane protein expressed by mucosal secretory tissues for both protection against microbial infection and lubrication. An important characteristic of MUC1 is its variable number of tandem repeats (VNTR) containing several sites for O-glycosylation. VNTR length has been associated with many human diseases and with certain economically important traits in domestic ruminants. The aim of the present study was to correlate the length of MUC1 gene VNTR with expected progeny differences (EPDs) obtained for growth, fertility and carcass traits. Five alleles were identified, with alleles containing short VNTRs being more frequent than those with long, thereby demonstrating that Brazilian Nelore cattle are... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Molecular marker; Productive traits; Quantitative trait locus. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100013 |
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| Registros recuperados: 717 | |
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