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A. Velasquez, R. Arias, and M. Toneatti 2012. Effect of the type of substrate on the chemical composition and productivity of a protein concentrate of yeast origin. Cien. Inv. Agr. 39(3): 425-434. Extracts of Saccharomyces cerevisiae (Sc) yeast were generated using a biotechnological solid-state ...


Velásquez Briceno, AlejandroArias Inostroza, RodrigoToneatti Bastidas, Marcelo[Effect of the type of substrate on the chemical composition and productivity of a protein concentrate of yeast origin]Effect of the type of substrate on the chemical composition and productivity of a protein concentrate of yeast origin

The high content of crude protein (CP) of pastures in southern Chile creates a nutritional imbalance that results in large amount of nitrogen (N) being excreted into the environment. Two regression equations and a dynamic model, available from the literature, were utilized to simulate the N use e...


Arias Inostroza, RodrigoVelásquez Briceno, AlejandroToneatti Bastidas, Marcelo[Simulation of the nitrogen use efficiency in pasture-finished steers in southern Chile]Simulation of the nitrogen use efficiency in pasture-finished steers in southern Chile

Simple Summary Improving efficiency in beef cattle production requires the adoption of technologies that are low cost but high in return. High potency growth-promoting implants (HGPs) are widely used under feedlot conditions but there are few reports of their use under grazing conditions. We cond...


Arias Inostroza, RodrigoSanta-Cruz, CristobalVelásquez Briceno, Alejandro[Effect of High Potency Growth Implants on Average Daily Gain of Grass-Fattened Steers]Effect of High Potency Growth Implants on Average Daily Gain of Grass-Fattened Steers

The aim of this work was to evaluate the effect of the extrusion of dehulled lupins (Lupinus albus L.) and peas (Pisum sativum L.) on the ruminal degradability and intestinal digestibility of their protein contents. Ruminal degradability was evaluated in situ in the rumens of two fistulated cows....


Barchiesi, ClaudiaWilliams, PamelaVelásquez Briceno, Alejandro[Lupin and pea extrusion decreases the ruminal degradability and improves the true ileal digestibility of crude protein]Lupin and pea extrusion decreases the ruminal degradability and improves the true ileal digestibility of crude protein

Climate change is producing an increase on extreme weather events around the world such as flooding, drought and extreme ambient temperatures impacting animal production and animal welfare. At present, there is a lack of studies addressing the effects of climatic conditions associated with energy...


Arias Inostroza, RodrigoKeim, J. P.Gandarillas, M.Velásquez Briceno, AlejandroAlvarado Gilis, C.Mader, T. L.[Performance and carcass characteristics of steers fed with two levels of metabolizable energy intake during summer and winter season]Performance and carcass characteristics of steers fed with two levels of metabolizable energy intake during summer and winter season

There were two objectives: checking a methodology to test diet preferences in a natural environment and secondly to assess diet preferences of European wild boar in terms of species and plant characteristics when offered in a situation with minimal physical constraints. Five hundred pots (100 mm ...


Jordana Rivero, M.Gallardo, Maria A.Marnet, Pierre GuyVelásquez Briceno, Alejandro[Dietary preference of European wild boar (Sus scrofa L.) grazing grass and legume at two contrasting plant heights: A pilot study]Dietary preference of European wild boar (Sus scrofa L.) grazing grass and legume at two contrasting plant heights: A pilot study

A. Velasquez, and G. Pichard. 2010. In vitro protein breakdown by enzyme extracts of rumen origin: comparison with methods in situ and proteases of Streptomyces griseus. Cien. Inv. Agr. 37(3): 57-70. Proteolytic activity of enzymatic extracts generated from rumen microorganisms cultivated in vitr...


Velásquez Briceno, AlejandroPichard, Gaston[In vitro protein breakdown by enzyme extracts of rumen origin: comparison with methods in situ and proteases of Streptomyces griseus]In vitro protein breakdown by enzyme extracts of rumen origin: comparison with methods in situ and proteases of Streptomyces griseus

Heat stress has been recognised as a serious problem in dairy farms. The study goal was to assess the effects of climatic conditions on physiological and behavioural responses of dairy cows in Central Chile. Data of tympanic temperature (TT), panting score, respiration rate (RR), and shade utiliz...


Arias, Rodrigo A.Herrera, CamilaLarrain, RafaelGonzalez, FernandoMader, Terry L.Velásquez Briceno, Alejandro[Physiological and behavioural response of two dairy cows' genotypes during summertime in the central region of Chile]Physiological and behavioural response of two dairy cows' genotypes during summertime in the central region of Chile

The objective of this study was to compare the prediction efficiency of IgG concentration in bovine colostrum by NIRS, using liquid and dried (Dry-Extract Spectroscopy for Infrared Reflectance, DESIR) samples by transflectance and reflectance modes, respectively. Colostrum samples (157), obtained...


Jordana Rivero, M.Alomar, DanielValderrama, XimenaLe Cozler, YannickVelásquez Briceno, AlejandroHaines, Deborah[Prediction efficiency by near-infrared spectroscopy of immunoglobulin G in liquid and dried bovine colostrum samples]Prediction efficiency by near-infrared spectroscopy of immunoglobulin G in liquid and dried bovine colostrum samples

The in vitro crude protein (CP) digestibility (D-ivcp), true protein digestibility (D-tp) and degradation rate (kd(cp)) were measured in different protein extracts of Saccharomyces cerevisiae (Sc) yeast. These extracts were generated through a biotechnological method (solid state fermentation). W...


Velásquez Briceno, AlejandroArias Inostroza, Rodrigo[Effect of substrate on the in vitro protein digestibility of extracts generated by Saccharomyces cerevisiae]Effect of substrate on the in vitro protein digestibility of extracts generated by Saccharomyces cerevisiae

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