Feedlot Systems

AgNext’s feedlot research advances the efficiency, health, and sustainability of beef production by delivering practical, science-based solutions tailored to industry needs. Through rigorous evaluation of nutrition and management strategies in both scientific and commercial settings, this work enhances cattle performance, carcass quality, and profitability.

Publications on Feedlot Systems Research:

"Evaluation of cattle Sub-species and growth-promoting technology on growth performance, carcass characteristics, and enteric gas flux of steers finished in winter feedlot conditions"

Ashley Schilling-Hazlett, Kimberly Stackhouse-Lawson, Tony Bryant, Sara Place, John Ritten, Juan Vargas, Irene Reis, Edilane Martins, Maya Swenson, Erin Burke, Rhyse Campion, Cesar Velasquez, Anna Shadbolt, Pedro Carvalho. Journal of Animal Science, December, 2025.

"Environmental and Ethical Considerations"

Maya Swenson, Sara Place, Glynn Tonsor, Jaime Luke. Rangeland and Ecology Management, November 2025. Veterinary Clinics of North America: Food Animal Practice, December 2025.

"Residual methane emission determination and classification of growing steers during the backgrounding and finishing phases"

Juan Vargas, Marisa Werner, Maya Swenson, Leonardo Sitorski, Eduardo Marostegan Paula, Diego Manriquez, Pedro Carvalho, Sara Place. Journal of Animal Science, November, 2025.

"Evaluation of cattle sub-species and growth-promoting technology on growth performance, carcass characteristics, and gas flux of steers finished in summer feedlot conditions"

Ashley Schilling-Hazlett, Kim Stackhouse-Lawson, Tony Bryant, Juan Vargas, Sara Place, John Ritten, Edilane Martins, Willan Souza, Maya Swenson, Erin Burke, Rhyse Campion, Anna Shadbolt, Pedro Carvalho. Journal of Animal Science, September, 2025.

"Use of animal performance and gas flux for estimating dry matter intake in growing steers"

Juan Vargas, Maya Swenson, Macarena Gomez-Salmoral, Liza Garcia, Eduardo Paula, Leo Sitorski, Leticia Campos, Pedro Carvalho, Kim Stackhouse-Lawson, Nicolas DiLorenzo, Sara Place. Translational Animal Science, August, 2025.

"Effect of copaiba oil on intake, apparent nutrient digestibility, ruminal fermentation, nitrogen balance, and growth performance of lambs in confined conditions"

Ancelmo Rodrigues Cunha, Terezinha Teixeira de Souza, Evandro Maia Ferreira, Janaina Socolovski Biava, Rhaíssa Garcia de Assis, Alexandre Vaz Pires, Pedro Henrique Vilela Carvalho, Michel do Vale Maciel, Marcos Vinicius de Castro Ferraz Junior. Revista Brasileira de Zootecnia (RBZ), August, 2025.

"Employing direct-fed microbial and hydrolysed yeast to modulate in vitro ruminal fermentation parameters of medium- and low-quality forages"

Fernanda Rigon, Amanda R. Cagliari, Elaine Magnani, Marcos Inacio Marcondes, Danilo Grandini, Brooke Humphrey, Pedro Del Bianco Benedeti, Flavio Dutra Resende, Gustavo Rezende Siqueira, Renata Helena Branco, Eduardo Marostegan Paula. The Journal of Agricultural Science, July 2025.

"Assessing the effects of supplementation with a Saccharomyces cerevisiae fermentation-derived postbiotic on methane production, ruminal fermentation, and nutrient utilization in beef cattle"

Ignacio Fernandez-Marenchino, Liza Garcia, Araceli Maderal, Federico Tarnonsky, Federico Podversich, Juan Vargas, Wilmer Cuervo, Camila Gomez-Lopez, Tessa M Schulmeister, Ilkyu Yoon, Nicolas DiLorenzo. Journal of Animal Science, July, 2025.

"Narasin Supplementation Enhances Growth Performance in Grazing Cattle"

Daniel Polizel, Rodrigo Marques, Arnaldo Limede, Fernando Cidrini, José Gonçalves, Pedro Carvalho, and Alexandre Pires. MDPI, July 2025.

"Evidence of long-distance clonal spreading and low genomic diversity of Kikuyu grass from highland livestock farms after a century of intentional introduction in Colombia"

Ivania Cerón-Souza, Javier Castillo-Sierra, Paula H. Reyes-Herrera, Jhon A. Berdugo-Cely, Andrea Parra-Salazar, Daniela Lozano-Arce, Jorge Duitama, Yesid Avellaneda, Juan Vargas. Crop Science, June 2025.

"Evaluation of models of enteric methane emissions in finishing steers"

Juan Vargas, Maya Swenson, Ashley Schilling-Hazlett, Irene Reis, Cesar Velazquez, Edilane Martins, Leo Sitorski, Leticia Campos, Pedro Carvalho, Kim Stackhouse-Lawson, Sara Place. Science Direct, June 2025.

"Evaluation of the residual feed intake on carcass and meat quality traits of Nellore bulls: A biochemical and molecular approach"

Daniela Vesga, Rafaela Rodrigues, Christina Ferreira, Juliana Torrecilhas, Pedro Carvalho, Gregori Rovadoski, Marcelo Coutinho, Guilherme Pereira, Rodrigo Torres, Otávio Machado Neto, Luis Artur Chardulo, Welder Baldassini. Journal of Animal Science, June, 2025.

"Beef cattle phenotypic plasticity and stability of dry matter intake and respiration rate across varying levels of temperature humidity index"

William Shaffer, Jorge Hidalgo, Nora Bello, Rylie Noland, Jennifer Bormann, Robert Weaber, Cashley Ahlberg, Kelsey Bruno, Clint Krehbiel, Michelle Calvo-Lorenzo, Chris Richards, Sara Place, Udaya DeSilva, Larry Kuehn, Megan Rolf. Journal of Animal Science, April 2025.

"Influence of Biochar supplementation on comparative growth-performance and carcass characteristics of Angus x Holstein vs Charolais x Holstein calf-fed steers"

Brooke Latack, Pedro Carvalho, Gustavo Moura, Richard Zinn. Journal of Animal Science, April 2025.

"Enteric methane emission classification and ranking of growing steers during the backgrounding and finishing phases"

Juan Vargas, Diego Manriquez, Maya Swenson, Pedro Carvalho, Sara Place. Journal of Animal Science, February 2025.

"Effects of Production System With or Without Growth-Promoting Technologies on Growth and Blood Expression of (Cyto)Chemokines and Heat Shock and Tight Junction Proteins in Bos taurus and indicus Breeds During Summer Season"

Mark Branine, Ashley Schilling-Hazlett, Pedro Carvalho, Kim Stackhouse-Lawson, Edilane Martins, Julia Travassos da Silva, Laura Amundson, Chris Ashworth, Mike Socha, and Sami Dridi. Veterinary Sciences, January 2025.

"Muscle tissue transcriptome of F1 Angus-Nellore bulls and steers feedlot finished: impacts on intramuscular fat deposition"

Irene Reis, Welder Angelo Baldassini, Germán Darío Ramírez-Zamudio, Iasmin Myrele Santos Calaça de Farias, Marcos Roberto Chiaratti, Sérgio Pereira Junior, Ricardo Perecin Nociti, Pedro Carvalho, Rogério Abdallah Curi, Guilherme Luis Pereira, Luis Artur Loyola Chardulo & Otávio Rodrigues Machado Neto. BMC Genomics, December 2024.

"Effect of Cashew Nutshell Extract, Saponins and Tannins Addition on Methane Emissions, Nutrient Digestibility and Feeding Behavior of Beef Steers Receiving a Backgrounding Diet"

Cuervo, Wilmer, Camila Gómez, Federico Tarnonsky, Ignacio Fernandez-Marenchino, Araceli Maderal, Federico Podversich, Juan Vargas, and Nicolas DiLorenzo. Animals, October 2024.

"Performance, nutrient utilization and meat quality traits in Bos indicus cattle: a meta-analysis examining the effect of residual feed intake"

Daniela Alvarado, Rodrigo Torres, José Moreira, Yury Granja-Salcedo, Otavio Machado Neto, Luis Artur Chardulo, Mahesh Nair, Pedro Carvalho, Welder Baldassini. Tropical Animal Health and Production, July 2024.

"Association of morbidity, mortality, and average daily gain with transfer of passive immunity in dairy-beef crossbred calves up to 60 d of life"

Jessica Pereira, Fernanda Ferreira, Pedro Carvalho, Joao Bittar, Noelia Del-Rio, Marcos Marcondes. Journal of Dairy Science, May 2024.

"Determination of gas flux and animal performance test duration of growing cattle in confined conditions"

Juan Vargas, Maya Swenson, Sara Place. Translational Animal Science, April 2024.

"Long Term Feeding Effects of a Vaccine against of Endotoxemia (ENDOVAC-Beef) on Growth Performance and Carcass Characteristics of Growing-Finishing Calf-Fed Holstein Steers"

Brooke Latack, Pedro Carvalho, Alejandro Plascencia, Richard Zinn. Iranian Journal of Applied Animal Science, March 2024.

"Influence of low-level tannin supplementation on comparative growth-performance of Holstein and Angus x Holstein cross calf-fed concentrate-based finishing diets for 328 days"

Pedro Carvalho, Brooke Latack, Marcos Ferraz, Lester Nolasco, Willi R Meireles, Heitor Oliveira, Richard Zinn. Journal of Animal Science. March 2024.

"Influence of metabolizable protein and methionine supplementation on growth-performance of Holstein steer calves during the initial 112-d feedlot growing phase"

Jaime Salinas-Chavira, Pedro Carvalho, Brooke Latack, Marcos Ferraz, Martin Montano, Richard Zinn. Translational Animal Science, January 2024.

"Heritability and variance component estimation for feed and water intake behaviors of feedlot cattle"

Elizabeth Dressler, William Shaffer, Kelsey Bruno, Clint Krehbiel, Michelle Calvo-Lorenzo, Chris J Richards, Sara Place*, Udaya DeSilva, Larry Kuehn, Robert L Weaber, Jennifer Bormann, and Megan Rolf. Journal of Animal Science, November, 2023.

*This work was conducted while Dr. Place was still at Oklahoma State University.

"Heat Stress Mitigation Strategies in Feedyards: Use, Perceptions, and Experiences of Industry Stakeholders"

Lauren Dean, Anthony Tarpoff, Kirsten Nickles, Sara Place, Lily Edwards-Callaway. Animals, September 2023

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