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| Registros recuperados: 389 | |
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| Cruz Jiménez, Joaquín. |
| La proteína de origen animal es básica en la dieta de los mexicanos y las fuentes principales de ésta son las carnes de ave, bovino y porcino, de las que en 2011 se consumieron 60 kilogramos por persona, correspondiendo a la de bovino 16.5 kilogramos. En este estudio se identifica a las principales variables determinantes del mercado de carne de bovino en México y se estima el efecto de dichas variables considerando los precios de importación de la carne y de maíz y sorgo. Para establecer y cuantificar el efecto sobre el mercado de sus principales variables determinantes se diseñó un modelo econométrico de ecuaciones simultáneas que fue estimado por mínimos cuadrados en dos etapas con información secundaria para el periodo de 1970 a 2011. Los resultados... |
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Palavras-chave: Bovino; Granos forrajeros; Elasticidad; Saldo de comercio; Oferta; Demanda; Cattle; Feed grains; Elasticity; Balance of trade; Supply; Demand; Economía; Doctorado. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1881 |
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| Torres Beltrán, Anayeli. |
| El objetivo fue evaluar la composición química y calidad de la carne de bovinos en diferentes sistemas de alimentación del estado de Puebla, México. Se realizó un muestreo en cuatro regiones: Trópico Este y Trópico Oeste donde la alimentación es en pastoreo más alimento concentrado y en el Centro y Mixteca, donde el sistema es estabulado con alimento concentrado. En cada región se definieron tres sitios y en cada uno se muestrearon 3 animales (n=36). Se evaluó el músculo Longissimus dorsi para determinar humedad, proteína, extracto etéreo (EE), cenizas, ácidos grasos, pH, color (L*a*b), capacidad de retención de agua (CRA), pérdida de agua por cocción (PPC), textura, y se colectó una muestra de sangre para determinar clenbuterol. En humedad, proteína y... |
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Palavras-chave: Acidos grasos; Bovinos; Calidad de carne; Clenbuterol; Cattle; Fatty acids; Meat quality; Estrategias para el Desarrollo Agrícola Regional; EDAR; Maestría. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/2201 |
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| Velázquez Martínez, Mauricio. |
| Se evalúo el comportamiento productivo y calidad de la carne de toretes y corderos alimentados con taninos en la dieta. Se realizaron dos experimentos. En el primero, se usaron 27 toretes B. taurus x B. indicus (peso inicial 412.7±20 kg), asignados al azar a uno de tres tratamientos: dieta base (DB), dieta base + 2500 IU de vitamina E/animal/día (DVE), y dieta base + 3% (base seca) de taninos condensados de extracto de Quebracho (DEQ). Se evaluó consumo de materia seca (CMS), ganancia diaria de peso (GDP), conversión y eficiencia alimenticia, rendimiento en canal, color, pH, composición química y actividad de agua (Aw) de la carne. Las variables se analizaron en un diseño de bloques completos al azar usando el Proc GLM; y se estimaron las curvas de consumo... |
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Palavras-chave: Bovinos; Ovinos; Consumo; Carne; Canales; Quebracho; Antioxidante; Cattle; Lambs; Intake; Meat; Carcass; Antioxidant; Ganadería; Doctorado. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/1982 |
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| Pérez Hernández, Víctor Manuel. |
| El objetivo fue evaluar el comportamiento y fisiología de ganado bovino de doble propósito pastando sitios con cobertura arbórea alta (CAA), baja (CAB) y sin cobertura (SCA), en las épocas de lluvia y sequía. Se observaron vacas adultas durante 24 días en cada época, registrando la temperatura corporal y los tiempos que dedicaron a las distintas actividades durante el día. Las vacas dedicaron el mismo tiempo al consumo en las lluvias (P > 0.05), sin embargo, hubo mayor tiempo en CAB durante la sequía (P < 0.0001). Durante las lluvias, las vacas en pastoreo bajo CAA mostraron menor motivación de irse al descanso o iniciar la rumia (P<0.001), y mayor hacia la exploración que en otros tratamientos (P<0.001); durante la sequía, aquellas pastando en... |
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Palavras-chave: Comportamiento; Cobertura arbórea; Ganado bovino; Estrés calórico; Behavior; Tree cover; Cattle; Heat stress; Agroecosistemas tropicales; Maestría. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1702 |
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| Furtado,Dermeval A.; Peixoto,Adriana P.; Nascimento,José W. B. do; Regis,Jonh E. F.. |
| The objective of this study was to evaluate the quality of air, bioclimatic indexes of facilities and physiological indices of Guzera and Sindhi calves, reared in climatic conditions of Agreste. The study was conducted at the experimental station of Alagoinha, PB, Brazil, using 16 calves of Sindi and Guzerá races. The average concentration of oxygen (20.85%), ammonia (1.99 ppm), carbon monoxide (<0.01 ppm), methane (0.13 ppm) and hydrogen sulfide (<0.01) within facilities, were within the limits established by the Brazilian and international standards, for both animals and workers. The bioclimatic index of temperature and humidity and the temperature of the black globe and humidity index were within the thermal comfort zone for cattle in most of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environment; Cattle; Adaptability; Physiological responses. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000100001 |
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| Nascimento,Carlos Souza do; Machado,Marco Antonio; Martinez,Mario Luiz; Silva,Marcos Vinícius G. Barbosa da; Guimarães,Marta Fonseca Martins; Campos,Ana Lúcia; Azevedo,Ana Luisa Sousa; Teodoro,Roberto Luiz; Verneque,Rui da Silva; Guimarães,Simone Eliza Facioni; Oliveira,Denise Aparecida Andrade. |
| The effect of the bovine major histocompatibility complex (BoLA) locus on animal health may be due to a direct action of its alleles on immune functions, whereas its indirect effect on production traits might be explained by the better general health conditions of more productive animals. In the present study, the BoLA-DRB3 gene was investigated in 1058 cows belonging to seven Brazilian Gyr Dairy herds (Bos indicus, Zebu cattle). A total of 37 alleles were identified, 15 of them described for the first time in a Zebu breed. A highly significant association (p < 0.02) was observed between allele *54 and a decrease (-26.1 kg) in milk protein yield and there was a significant association (p < 0.05) between this allele and lower (-26.07 kg) milk fat... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cattle; Marker-assisted selection; Molecular markers; PCR-RFLP. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000400011 |
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| Silva,Fabyano Fonseca; Tunin,Karen P.; Rosa,Guilherme J.M.; Silva,Marcos V.B. da; Azevedo,Ana Luisa Souza; Verneque,Rui da Silva; Machado,Marco Antonio; Packer,Irineu Umberto. |
| Nowadays, an important and interesting alternative in the control of tick-infestation in cattle is to select resistant animals, and identify the respective quantitative trait loci (QTLs) and DNA markers, for posterior use in breeding programs. The number of ticks/animal is characterized as a discrete-counting trait, which could potentially follow Poisson distribution. However, in the case of an excess of zeros, due to the occurrence of several noninfected animals, zero-inflated Poisson and generalized zero-inflated distribution (GZIP) may provide a better description of the data. Thus, the objective here was to compare through simulation, Poisson and ZIP models (simple and generalized) with classical approaches, for QTL mapping with counting phenotypes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dairy; Cattle; Tick infestation; QTL regression; Generalized linear model. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000400008 |
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| Zaros,Lilian Giotto; Bricarello,Patrízia Ana; Amarante,Alessandro Francisco Talamini; Coutinho,Luiz Lehmann. |
| T cells produce cytokines that affect host response to infection. This paper reports real-time RT-PCR conditions and validation steps for accurate quantification of Bos indicus cytokines, interleukin (IL)-2, IL-4, IL-8, IL12p-35, IL-13, tumoral necrosis factor (TNF)-alpha, interferon (IFN)-gamma, monocyte chemoattractant proteins (MCP)-1 and MCP-2, and the glycoprotein mucin (MUC)-1 in two groups of Nelore cattle, one resistant and the other susceptible to gastrointestinal nematode infections. RPL-19 was shown to be an ideal internal control gene, since its expression was constant across treatments and presented lower variation when compared to the GAPDH gene. The optimized conditions established in the present study can be used to determine the immune... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Cytokine gene expression; Real-time RT-PCR; Cattle; Gastrointestinal nematodes; Bovine cytokines. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000400012 |
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| Carolino,Inês; Sousa,Conceição O.; Ferreira,Sónia; Carolino,Nuno; Silva,Fátima S.; Gama,Luís T.. |
| A study was conducted to assess the feasibility of applying a panel of 10 microsatellite markers in parentage control of beef cattle in Portugal. In the first stage, DNA samples were collected from 475 randomly selected animals of the Charolais, Limousin and Preta breeds. Across breeds and genetic markers, means for average number of alleles, effective number of alleles, expected heterozygosity and polymorphic information content, were 8.20, 4.43, 0.733 and 0.70, respectively. Enlightenment from the various markers differed among breeds, but the set of 10 markers resulted in a combined probability above 0.9995 in the ability to exclude a random putative parent. The marker-set thus developed was later used for parentage control in a group of 140 calves from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cattle; Genetic markers; Microsatellites; Parentage control. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200017 |
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| Lemos,Daniela Cristina; Rios,Álvaro Fabrício Lopes; Caetano,Lisandra Cristina; Lôbo,Raysildo Barbosa; Vila,Reginaldo Aparecido; Martelli,Lúcia; Takeuchi,Paula Lumy; Ramos,Ester Silveira. |
| The Y-encoded, testis-specific protein (TSPY) is a Y-specific gene. The copy numbers of TSPY range from 20 to 60 in men and up to 200 in bulls. In this study, we examined the possibility of using the TSPY gene to sex cattle. DNA from blood samples of 100 Nelore cattle (50 males and 50 females) from the Nelore Cattle Breeding Program (PMGRN) was screened for TSPY by PCR using TSPY-specific primers. The assay was highly specific since all male samples were TSPY-positive and all female samples were negative. Positive results were also obtained at low DNA concentrations (less than 1 rhog/muL). These results showed that TSPY was a good male-specific marker, the usefulness of which was enhanced by the high copy number of the gene. This is the first report to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bovine; Cattle; PCR; Sexing; TSPY. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100020 |
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| Registros recuperados: 389 | |
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