Vol. 3 No. 4 (2012): Octubre-Diciembre

Articles

• Two experiments were conducted to determine the effects of steam explosion (STE) on chemical composition and digestibility of the following forages (F): sorghum stover (SOS), corn stover (COS) and sugarcane bagasse (SUB). The Exp 1 was conducted to determine the effects of STE on pH, fiber fractions (FF) and in vitro digestibility (IVDMD). Fifty four samples were generated using a RCB design with a 3*3*3 factorial treatment arrangement, where the factors were: pressure (P: 10.3, 13.8 and 17.2 kg/cm2), time (T: 5, 10 and 15 min) and F (SOS, COS and SUB). In Exp 2, changes in the digestion kinetics were determined when using the combinations of P and T that maximized IVDMD; thus, SOS and COS were treated at 13.8 kg/cm2 for 10 min, and SUB at 17.2 kg/ cm2 for 15 min. The treated and non-treated samples were incubated in rumen for up to 120 h. Data were fitted to a nonlinear model. No significant interactions T*P or F*P*T were detected on pH or FF; however, as P or T increased, pH, NDF and hemicellulose decreased. Lignin or ADF were not affected by P or T. As for IVDMD concerns, P*F and F*T interactions were significant. STE increased soluble fraction and degree of F digestion. Only lag time of SUB was reduced by STE. The potential digestible fraction was reduced in SOS and COS. It was concluded that the changes in chemical composition and digestion kinetics are related mainly to cell wall solubilization by stem explosion.

  Ricardo Basurto Gutiérrez, Agustín Escamilla Martínez, Sergio Moya Vega, Ericka Ramírez Rodríguez, Juan Becerra Becerra

  407-425

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• Effect of ractopamine and different lysine concentrations in pig diets on pork chemical and sensory characteristics

  María Antonia Mariezcurrena-Berasain, Diego Braña-Varela, María Dolores Mariezcurrena-Berasain, Ignacio Arturo Domínguez-Vara, Danilo Méndez-Medina, María Salud Rubio-Lozano

  427-437

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• Different levels of metabolizable energy and sulfur amino acids in diets for white Bovans hens

  María de los Ángeles Tepox Pérez, Benjamín Fuente Martínez, Tomás Jínez Méndez, Ernesto Ávila González

  439-448

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• Trend in levels of Clenbuterol in bovine samples from 2005 to 2010 in Guerrero, Mexico

  Luis Alberto Chávez Almazán, Jesús Antonio Díaz Ortiz, Beatriz Pérez Cruz, Mario Alberto Alarcón Romero

  449-458

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• Genetic diversity and geographic distribution of Mycobacterium bovis from cattle in Mexico

  Feliciano Milián Suazo, Leticia García Casanova, Cecilia Romero Torres, Germinal J. Cantó Alarcón, José A Gutiérrez Reyes, Susana Gallegos Sosa, Marcela Mercado Pezzat, Félix Mejía Estrada F., Aída L. Peña Cisneros, Ciro Estrada Chávez, Oscar Pizano Martínez

  459-471

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• Silencing of the cellular prion protein (PrPC), by interference RNA (siRNA), reduces HSV-1 and HSV-2 infection in SK-SY5Y cells

  Elizabeth Ortega-Soto, Zaira Esperanza Arellano-Anaya, Ana Carolina Castañeda-Colín, Blanca Lilia Barrón-Romero

  473-846

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• Genetic parameter estimates for growth traits in Katahdin sheep using different models

  Coralia Inés V. Manzanilla Pech, José Antonio Torres Vázquez, Aurelio Borrayo Zepeda, Ángel Ríos Utrera, Juan José Baeza Rodríguez, Guillermo Martínez Velázquez, Vicente Eliezer Vega Murillo, Moisés Montaño Bermúdez

  487-500

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• Milk yield and its relationship to weaning weight of calves from Criollo, Guzerat and F1 reciprocal cross cows

  Guillermo Martínez Velázquez

  501-514

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• Group testing. An efficient alternative for estimating animal prevalence

  Osval Antonio Montesinos López, Abelardo Montesinos López, Ignacio Luna Espinoza, Laura Sanely Gaytán Lugo, Teodoro Espinosa Solarese

  515-531

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