Rojas

Processing of ingredients and diets and effects on nutritional value for pigs

Rojas, O. J. and H. H. Stein. 2017. Processing of ingredients and diets and effects on nutritional value for pigs. J. Anim. Sci. Biotechnol. 8:48. Link to full text

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Use of feed technology to improve the nutritional value of feed ingredients

Rojas, O. J. and H. H. Stein. 2016. Use of feed technology to improve the nutritional value of feed ingredients. Anim. Prod. Sci. 56:1312-1316. Link to abstract

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Effects of feed processing on the nutritional value of feed ingredients or diets fed to pigs

Rojas, O. J. and H. H. Stein. 2016. Effects of feed processing on the nutritional value of feed ingredients or diets fed to pigs. Pages 33-49 in Proceedings of the 2016 Chinese Swine Industry Symposium, Shanghai, China, October 20-21, 2016. Link to full text (.pdf)

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Concentration of digestible and metabolizable energy and digestibility of energy and nutrients by growing pigs in distillers dried grains with solubles produced in and around Illinois

Curry, S. M., O. J. Rojas, and H. H. Stein. 2016. Concentration of digestible and metabolizable energy and digestibility of energy and nutrients by growing pigs in distillers dried grains with solubles produced in and around Illinois. Prof. Anim. Sci. 32:687-694. Link to abstract

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Effects of pelleting, extrusion, or extrusion and pelleting on energy and nutrient digestibility in diets containing different levels of fiber and fed to growing pigs

Rojas, O. J., E. Vinyeta, and H. H. Stein. 2016. Effects of pelleting, extrusion, or extrusion and pelleting on energy and nutrient digestibility in diets containing different levels of fiber and fed to growing pigs. J. Anim. Sci. 94:1951-1960. Link to full text (.pdf)

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Effects of particle size of yellow dent corn on physical characteristics of diets and growth performance and carcass characteristics of growing–finishing pigs

Rojas, O. J., Y. Liu, and H. H. Stein. 2016. Effects of particle size of yellow dent corn on physical characteristics of diets and growth performance and carcass characteristics of growing–finishing pigs. J. Anim. Sci. 94:619-628. Link to full text (.pdf)

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Energy concentration and amino acid digestibility in high protein canola meal, conventional canola meal, and in soybean meal fed to growing pigs

Liu, Y., N. W. Jaworski, O. J. Rojas, and H. H. Stein. 2016. Energy concentration and amino acid digestibility in high protein canola meal, conventional canola meal, and in soybean meal fed to growing pigs. J. Anim. Feed Sci. Technol. 212:52-62. Link to full text (.pdf)

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Use of feed technology to improve the nutritional value of feed ingredients

Rojas, O. J. and H. H. Stein. 2015. Use of feed technology to improve the nutritional value of feed ingredients. Page 23 in Advances in Animal Nutrition in Australia, Armidale, New South Wales, Australia, October 26-28, 2015. (Abstr.) Link to abstract (.pdf)

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Effects of reducing the particle size of corn grain on the concentration of digestible and metabolizable energy and on the digestibility of energy and nutrients in corn grain fed to growing pigs

Rojas, O. J. and H. H. Stein. 2015. Effects of reducing the particle size of corn grain on the concentration of digestible and metabolizable energy and on the digestibility of energy and nutrients in corn grain fed to growing pigs. Livest. Sci. 181:187-193. Link to full text (.pdf)

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Effects of pelleting and extrusion on energy digestibility in pig diets containing different levels of fiber

Rojas, O. J., E. Vinyeta, and H. H. Stein. 2015. Effects of pelleting and extrusion on energy digestibility in pig diets containing different levels of fiber. J. Anim. Sci. 93(Suppl. s3):227-228 (Abstr.) Link to abstract (.pdf)

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Energy concentration and amino acid digestibility in high-protein canola meal, conventional canola meal, and soybean meal fed to growing pigs

Berrocoso, J. D., O. J. Rojas, Y. Liu, J. Shoulders, J. C. González-Vega, and H. H. Stein. 2015. Energy concentration and amino acid digestibility in high-protein canola meal, conventional canola meal, and soybean meal fed to growing pigs. J. Anim. Sci. 93:2208-2217. Link to full text (.pdf)

Effects of chemical, physical, or enzymatic treatments on concentration of digestible and metabolizable energy and on ATTD of energy, organic matter, and detergent fiber in distillers dried grains with solubles fed to growing pigs

Rojas, O. J. and H. H. Stein. 2015. Effects of chemical, physical, or enzymatic treatments on concentration of digestible and metabolizable energy and on apparent total tract digestibility of energy, organic matter, and detergent fiber in distillers dried grains with solubles fed to growing pigs. J. Anim. Sci. 93(Suppl. 2):135 (Abstr.) Link to abstract (.pdf)

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Effects of extrusion of corn and oats on the digestibility of energy and nutrients in diets fed to pigs

Liu, Y., O. J. Rojas, and H. H. Stein. 2015. Effects of extrusion of corn and oats on the digestibility of energy and nutrients in diets fed to pigs. J. Anim. Sci. 93(Suppl. 2):134-135 (Abstr.) Link to abstract (.pdf)

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Use of feed technology to improve the nutritional value of feed ingredients feed to pigs

Rojas, O. J. and H. H. Stein. 2015. Use of feed technology to improve the nutritional value of feed ingredients fed to pigs. J. Anim. Sci. 93(Suppl. 2):61 (Abstr.) Link to abstract (.pdf)

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Impact of particle size reduction on feed cost and feed efficiency

Rojas, O. J. and H. H. Stein. 2015. Impact of particle size reduction on feed cost and feed efficiency. Pages 207-227 in Proc. Banff Pork Seminar, Banff, AB, Canada, Jan. 20-22, 2015. Link to full text (.pdf)

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Effects of extrusion and pelleting on energy and nutrient digestibility in diets fed to pigs

Rojas, O. J. 2014. Effects of extrusion and pelleting on energy and nutrient digestibility in diets fed to pigs. Page 159 in XXX Curso de Especializacion FEDNA, Madrid, November 5-6, 2014. (Abstr.) Link to abstract (.pdf)

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Effects of replacing fish, chicken, or poultry by-product meal with fermented soybean meal in diets fed to weanling pigs

Rojas, O. J. and H. H. Stein. 2015. Effects of replacing fish, chicken, or poultry by-product meal with fermented soybean meal in diets fed to weanling pigs. Rev. Colomb. Cienc. Pecu. 28:22-41. Link to full text (.pdf)

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Effects of pelleting and extrusion on energy and nutrient digestibility in diets fed to pigs

Pelleting and extrusion are technologies that have been used in livestock feeding to improve nutrient digestibility and feed conversion. Recent research concluded that reduced performance of pigs fed diets containing high concentrations of fiber was ameliorated if the diets were pelleted. Extrusion is also of benefit in high fiber diets, because it may increase the solubility of dietary fiber. It is possible that the benefits of extrusion and pelleting are greater in high fiber diets than in low fiber diets, but this hypothesis has not been investigated. Therefore, an experiment was conducted to determine effects of extrusion and pelleting on energy and nutrient digestibility in diets containing low, medium, or high concentrations of fiber.

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Effects of extrusion of corn and oats on the digestibility of energy, crude protein, and fiber in diets fed to pigs

In extrusion, cereal grains are processed under conditions of heat and pressure. Like other types of heat treatment, extrusion may reduce the concentration of antinutritional factors. Extrusion also gelatinizes starch, improving its digestibility. Improved digestibility of starch should, in turn, lead to an increase in digestible energy. Extrusion has also been shown in some studies to solubilize the insoluble fraction of the fiber which would also increase fiber digestibility and digestible energy.

Corn is a high starch ingredient, while oats are high in fiber. An experiment was conducted to determine the effects of extruding corn and oats on the apparent total tract digestibility (ATTD) of energy and fiber when fed to growing pigs.

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Concentration of metabolizable energy and digestibility of energy, phosphorus, and amino acids in lemna protein concentrate fed to growing pigs

Rojas, O. J., Y. Liu, and H. H. Stein. 2014. Concentration of metabolizable energy and digestibility of energy, phosphorus, and amino acids in lemna protein concentrate fed to growing pigs. J. Anim. Sci. 92:5222-5229. Link to full text (.pdf)

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