Duarte Diaz

Interests

Research

Mycotoxins, Dairy, Nutrition, Comparative Nutrition, Animal Nutrition, International Agriculture, Toxicology, Food Safety

Teaching

Diary, Animal Nutrition, International Agriculture (livestock)

Courses

Scholarly Contributions

Journals/Publications

• Diaz, D., Reith, R., Sieck, R., Grijalva, P., Diaz, D., Schmidt, T., Yates, D., & Pettersen, J. (2021). Zilpaterol Hydrochloride and Heat Stress Each Alter the Cattle Adipose Transcriptome and Predicted to Alter Molecular Pathways After 21 Days. Journal of Animal Science, 99, 17-18.
• Reith, R. R., Sieck, R. L., Grijalva, P. C., Swanson, R. M., Fuller, A. M., Diaz, D. E., Schmidt, T. B., Yates, D. T., & Petersen, J. L. (2022). Transcriptome analyses indicate that heat stress-induced inflammation in white adipose tissue and oxidative stress in skeletal muscle is partially moderated by zilpaterol supplementation in beef cattle. Journal of animal science.
  More info

  Heat stress (HS) triggers oxidative stress, systemic inflammation, and disrupts growth efficiency of livestock. β-adrenergic agonists supplemented to ruminant livestock improve growth performance, increase skeletal muscle mass and decrease carcass fat. The objective of this study was to understand the independent and interacting effects of HS and zilpaterol hydrochloride (ZH) supplementation on the transcriptome of subcutaneous white adipose tissue and the longissimus dorsi muscle in steers. Twenty-four Red Angus-based steers were assigned to thermoneutral (TN; Temperature Humidity Index (THI)=68) or HS (THI=73-85) conditions and were not supplemented or supplemented with ZH (8.33 mg/kg/day) for 21 d in a 2x2 factorial. Steers in the TN condition were pair-fed to the average daily feed intake of HS steers. RNA was isolated from adipose tissue and skeletal muscle samples collected via biopsy on 3, 10, and 21 d and sequenced using 3' Tag-Seq to an achieved average depth of 3.6 million reads/sample. Transcripts, mapped to ARS-UCD1.2, were quantified. Differential expression (DE) analyses were performed in DESeq2 with a significance threshold for false discovery rate of 0.05. In adipose, 4 loci (MISP3, APOL6, SLC25A4, S100A12) were DE due to ZH on d 3, and 2 (RRAD, ALB) were DE due to the interaction of HS and ZH on d 10 (Padj
• Ottman, M. J., Diaz, D., Sheedy, M. D., & Ward, R. (2016). Effect of Amount of Irrigation Water Applied on Forage Sorghum Yield and Quality at Maricopa, AZ, 2015.. College of Agriculture and Life Sciences, University of Arizona.
• Ottman, M. J., Diaz, D., Sheedy, M. D., & Ward, R. (2016). Forage Sorghum Hybrid Yield and Quality at Maricopa, AZ, 2015. College of Agriculture and Life Sciences, University of Arizona.
• Ottman, M. J., Diaz, D., Sheedy, M. D., & Ward, R. (2016). Irrigation Interval Effect on Yield and Quality of Forage Sorghum at Maricopa, AZ, 2015. College of Agriculture and Life Sciences, University of Arizona.
• Ottman, M. J., Diaz, D., Sheedy, M. D., & Ward, R. (2016). Nitrogen Fertilizer Rate Effect on Forage Sorghum Yield, Quality, and Tissue Nitrogen Concentrations at Maricopa, AZ, 2015. College of Agriculture and Life Sciences, University of Arizona.
• Ottman, M. J., Diaz, D., Sheedy, M. D., & Ward, R. (2016). Row Spacing Effect on Forage Sorghum Yield and Quality at Maricopa, AZ, 2015. College of Agriculture and Life Sciences, University of Arizona.
• Reith, R., Sieck, R., Grijalva, P., Swanson, R., Diaz, D., Schmidt, T., Yates, D., & Petersen, J. (2021). Supplementing zilpaterol hydrochloride to heat-stressed beef cattle for 21 d alters the adipose transcriptome and is predicted to alter stress response pathways. Translational Animal Science, 56-60. doi:http://doi.org/10.1093/tas/txabl158
• Sieck, R., Reith, R., Fuller, A., Grijalva, P., Treffer, L., Swanson, R., Ponte, M., Khalimonchuk, O., Diaz, D., Schmidt, T., Yates, D., & Petersen, J. (2021). Beta-adrenergic agonists and heat stress impact skeletal muscle gene expression and mitochondrial function in beef cattle. Translational Animal Science, 99, 17-18.
• Allen, S. C., Russo, K., Compart, D. M., Diaz, D., & Ward, S. H. (2020). Dose response reduction of aflatoxin M1 in milk of Holstein cows administered an aluminosilicate clay adsorbent. The Bovine Practitioner, 54(1), 1-8. doi:https://doi.org/10.21423/bovine-vol54no1p1-8
• Matthew, V. P., Robert, C., Yao, X., Compart, D., Kay, R., Renquist, B. J., Leticia, C., & Diaz, D. (2020). Evaluation of Mid-Lactation Holstein Cows During Heat Stress in Response to a Dietary Feed Additive. Dairy and Vet Sci J., 14(5), 116-125. doi:DOI: 10.19080/JDVS.2020.14.555900
• Diaz, D. (2019). Mycotoxins and mycotoxicosis. Feedstuffs reference issue and & nutrition guide, 52-60.
  More info

  Feedstuffs Yearly Reference Guide. Feedstuff is the most important popular press agricultural magazine with global readership with 71.5k total weekly impressions, 10,000 eNews subscribers, and 12.5k Audited Subscribers (https://marketing.farmprogress.com/brands/livestock/feedstuffs/)
• Compart, D., Collier, R., Wright, A., Renquist, B. J., Xiao, Y., Diaz, D., & Vander Poel, M. (2018). Environmental chamber heat stress responses and adaptations in crossbred Hereford steers. Translational Animal Science (TAS), Supplement 1, S185-S188.
• Diaz, D., Vander, P. M., Xiao, Y., Renquist, B., Wright, A., Collier, R., & Compart, D. (2018). Environmental chamber heat stress responses and adaptations in crossbred Hereford steers. Translational Animal Science, 2(suppl_1), S185--S188.
• Diaz, D., Whitlow, L., & Hagler, W. (2018). Mycotoxins and Mycotoxicosis. Feedstuffs Magazine Feed Mill Tech Guide, 9-23.
• Diaz, D., Whitlow, L., & Hagler, W. (2017). Mycotoxins and Mycotoxicosis. Feedstuff Feed and Mill Technology Guidebook, 9-23.
• Ward, R. W., Sheedy, M. D., Diaz, D. E., & Ottman, M. J. (2017). Effect of Amount of Irrigation Water Applied on Forage Sorghum Yield and Quality at Maricopa, AZ, 2015.. College of Agriculture and Life Sciences, University of Arizona.
• Ward, R. W., Sheedy, M. D., Diaz, D. E., & Ottman, M. J. (2017). Irrigation Interval Effect on Yield and Quality of Forage Sorghum at Maricopa, AZ, 2015. College of Agriculture and Life Sciences, University of Arizona.
• Diaz, D., Whitlow, L. W., & Hagle, W. M. (2016). Mycotoxins & Mycotoxicosis. Feedstuffs: The Feed & Mill Technology Guidebook.
  More info

  This review is part of a special issue published by Feedstuffs magazine titled "The Feed & Mill Technology Guidebook".

Proceedings Publications

• Diaz, D. (2019, April). Prevention, Assessment, and Mitigation of Mycotoxicosis in Dairy Cattle. In Proceedings for the Tri-state Nutirtion Conference, 27-36.
• Diaz, D. (2019, February). Video Technology for Large Dairy Operations: from Management to Precision Agriculture. In Western Dairy Management Conference.
• Diaz, D., Knight, C. W., Wright, A. D., & Greene, E. A. (2018, September). Shade use by horses in the arid southwest. In 14th International Society for Equitation Science Conference.
• Diaz, D. (2016, April). Efecto de tricocenos en la producción avícola y estrategias de control. In ANECA (Asociacion Nacional de Especialistas en Ciencias Avicolas).
• Diaz, D. (2016, February). A Multidisciplinary Approach to Prevention, Assessment, and Mitigation of Mycotoxicosis in the Dairy Industry. In Southwest Nutrition Conference.
• Diaz, D. (2016, October). Nutritional Toxicology in the Dairy Industry: Feed quality and Mycotoxins. In World Nutrition Forum, 267-276.

Presentations

• Diaz, D. (2021, Fall). Invited Presentation: Monitorizacion y control de micotoxinas a lo largo de la cadena de fabricacion de piensos. Latinamerican Poultry Nutrition Conference. Miami USA: LPN Agrinews.
• Diaz, D. (2020, December). Abordaje de un proceso de micotoxicosis en ganado de leche. Congreso Nacional Lechero Costa Rica. Costa Rica (Changed to virtual conference): Camara Nacional de Productores de Leche de Costa Rica.
• Diaz, D. (2020, December). Micotoxins and Ruminants. Society of Feed Technology UK. Edinburg UK (Cancelled and held virtually): Society of Feed Technology.
• Diaz, D. (2020, June). Micotoxicosis: Interacciones en la cadena de produccion. Sanfer Animal Health Annual Symposium (Keynote Speaker). Guadalajara Mexico (Moved to virtual conference): SanFer animal health.
• Diaz, D. (2020, May). Mycotoxin Mitigation: Linking Feed Quality and Dairy Cow Performance. Alltech One Experience (Virtual). Lexington KY, USA (Cancelled and moved to virtual): Alltech.
• Diaz, D. (2020, September). New Studies and Trends in Understanding the Role of Mycotoxins in Feed Production. Phibro Academy Virtual Conference (Global). Virtual (Globally): Phibro Animal Health.
• Diaz, D. (2020, September). Nuevos estudios y tendencias para comprender el papel de las micotoxinas en la producion de alimentos para animales. Phibro Academy (Virtual). Virtual (Global): Phibro Animal Health.
• Diaz, D. (2019, April). Practically evaluating and utilizing mycotoxin solutions on modern dairies. Alltech Dairy Nutritionist Meeting. San Diego: Alltech Biotechnology.
• Diaz, D. (2019, April). Prevention, Assessment, and Mitigation of Mycotoxicosis in Dairy Cattle. Tri-State Nutrition Conference. Fort Wayne Indiana: Tri-State Nutrition Conference.
• Diaz, D. (2019, April). Resumen de estudios sobre el impacto de las micotoxinas en el ganado lechero: Interacciones entre hongos, animales y el medio ambiente. Wisium - Technical meetings. Aguascalientes, Torreon Mexico: Wisium Nutrition.
• Diaz, D. (2019, February 19). Careers in the livestock industry. Pre-veterinary medicine club. Tucson Arizona: University of Arizona Pre-Vet Club.
• Diaz, D. (2019, Febuary). Camera placement to protect your dairy - Video tecvhnology as a precision Ag. Tool. Western Dairy Management Conference. Reno, Nevada.
• Diaz, D. (2019, July). Dairy Forage Initiative. Dairy Forage Initiative. Avondale Arizona: Cooperative Extension.
• Diaz, D. (2019, July). Update on the Arizona Dairy Forage Initiative. Dairy Forage Initiative. Casa Grande, Arizona: Cooperative Extension.
• Diaz, D. (2019, June). AF36 for Aflatoxin Control in Cotton. What is the Value to Dairy Production?. Cotton “Tent Talks”. Goodyear Arizona: Cooperative Extension.
• Diaz, D. (2019, June). Bridging the Gap Between Dairy Producers and Alfalfa Growers. 2019 Alfalfa and Forage “Tent Talk”. Buckeye Arizona: Cooperative Extension.
• Diaz, D. (2019, June). Nutritional intervention for the mitigation of heat stress in beef and dairy cattle. W3173-NC1029 Year in review meeting. Bozeman Montana.
• Diaz, D. (2019, June). Ruminants—Are they as resilient to mycotoxicosis as we think?. American Dairy Science Association Annual Meeting. Cincinnati, Ohio: American Dairy Science Association.
  More info

  Invited presentation during a special symposium - Ruminant nutrition: MYCOTOXINS—RECOGNIZING THEIR PRESENCE AND DEALING WITH THEM IN RUMINANT NUTRITION
• Diaz, D. (2019, March). Heat stress abatement through nutritional supplementation internventions. PMI - Land O'Lakes webinar. Online - webinar: PMI - Land O'Lakes.
• Diaz, D. (2019, November). Como impactan las micotoxinas en el desepeño productivo de las vacas, la inocuidad en la leche y el comercio. INTA - Special conference. Rafaela and Cordoba, Argentina: Instituto Nacional de Tecnologia Agropecuaria.
• Diaz, D. (2019, November). How dairy systems are adapting to increasing heat. Climate Adaptation and Food Systems Lunch and Network-Building Event. University of Arizona: Center for Climate Adaptation Science and Solutions.
• Diaz, D. (2019, Spring). Heat Stress Effects and Mitigation Strategies for Cattle in the Southwestern U.S.. Range Livestock Nutrition Workshop. Wilcox, Prescott, Holbrook Arizona: Cooperative Extension University of Arizona.
• Diaz, D., Vander Poel, M., Collier, R., Camacho, L., Xiao, Y., Compart, D., & Russo, K. (2019, June). Evaluating heat stress response in lactating Holstein cows with supplementation of a feed additive during mid lactation.. American Dairy Science Association Annual Meeting. Cincinnati Ohio: American Dairy Science Association.
  More info

  Graduate Student presentation
• Diaz, D. (2018, February). Low lignin alfalfa: Understanding the value to dairy producers. Alfalfa University. Ogden, UT: High Plains Journal.
• Diaz, D. (2018, February). Low lignin alfalfa: Where we are in the Dairy Industry. Tulare Farm Show. Tulare, CA: Aflorex Seeds.
• Diaz, D. (2018, January). Dairy Forage Production and Needs in Arizona. Southwest Indian Agricultural Association. Laughlin, NV: SWIIA.
• Diaz, D. (2018, June). Environmental chamber heat stress responses and adaptations in crossbred Hereford steers. ASAS Western Section Annual Meeting. Bend, OR: American Society of Animal Scientist.
• Diaz, D. (2018, June). Practical Considerations for Feeding Cows Under Heat Stress. American Dairy Science Association Annual Meeting. Knoxville, TN: ADSA.
• Diaz, D. (2018, October). Low Lignin Alfalfa: Dairy Applications. ARPAS Northeast Chapter Annual Meeting. Harrisburg, PA: American Registry of Professional Animal Scientists.
• Diaz, D. (2018, October). Mold, Plant, Animal and Climate Interactions in Mycotoxin Exposure. Penn State Dairy Cattle Nutrition Workshop. Harrisburg, PA: Penn State University Cooperative Extension.
• Diaz, D., Compart, D., Collier, R. J., Wright, A., Renquist, B. J., Xiao, Y., & Vander Poel, M. (2018, April). Evaluation of the efficacy of a feed supplement (BeefAbate) in attenuating the effects of heat stress on growing steers. Plains Nutrition Council. San Antonio, TX: Plains Nutrition Council.
• Diaz, D., Knight, C. W., Wright, A. D., Greene, E. A., Diaz, D., Knight, C. W., Wright, A. D., & Greene, E. A. (2018, September). Shade use by horses in the arid southwest. 14th International Society for Equitation Science Conference. Rome, Italy: International Society for Equitation Science.
• Diaz, D., Vander Poel, M., Xiao, Y., Renquist, B. J., Wright, A., Collier, R. J., & Compart, D. (2018, Summer). Environmental chamber heat stress responses and adaptations in crossbred Hereford steers. American Society of Animal Science Western Section. Bend, OR: American Society of Animal Science.
• Diaz, D. (2017, February). Forage Quality and Aflatoxin Control. 38th Annual Southeastern Arizona Ad Day & Trade Show. Wilcox, Arizona: CES University of Arizona.
• Diaz, D. (2017, February). Forage Quality and Aflatoxin Control. 38th Annual Southeastern Arizona Ad Day & Trade Show. Willcox, Arizona.
• Diaz, D. (2017, February). Mycotoxin Production in Grains. What's Under the Tarp: 2017 Emerging Mycotoxin Issues and Strategies. Online: Neogen Webinar Series.
  More info

  Online webinar - youtube records
• Diaz, D. (2017, February). Role of Antioxidants during Mycotoxicosis and Heat Stress. Southwest Nutrition Conference - pre-conference seminar. Tempe, Arizona.
• Diaz, D. (2017, January). Forage quality and its impact on milk quality. Field Crops "Clinics". Casa Grande: Cooperative Extension.
• Diaz, D. (2017, January). Forage quality and its impact on milk quality. Field Crops "Clinics". Maricopa: Cooperative Extension.
• Diaz, D. (2017, January). Forage quality and its impact on milk quality. Field Crops "Clinics". Pima: Cooperative Extension.
• Diaz, D. (2017, July). Applied Mycotoxicology in Production Agriculture: A Broad Look at a Specialized Field. Sociedad Latinoamericana de Micotoxicologia (SLAM). Puebla, Mexico: SLAM.
  More info

  Keynote speaker - Latinoamerican Micotoxicology Society
• Diaz, D. (2017, July). Low lignin alfalfa: what is the value to dairy producers. Cooperative Extension Workshop. Alfalfa and forage "tent talks". Buckeye Arizona: CES University of Arizona.
• Diaz, D. (2017, March). Sample Collection and Sampling Protocols and Analysis of Forages for Dairy Rations. The 3rd Alfalfa & Forage Crops Workshop. Maricopa Arizona: CES University of Arizona.
• Diaz, D. (2017, May). Mycotoxin Effects: Making Sense of Complex Biological Interactions. California Animal Nutrition Conference (CANC). Fresno, California: CANC.
• Diaz, D. (2017, October). Micotoxicosis en el campo: Interacciones entre hongos, plantas, animales, y el medio ambiente. (Mycotoxicosis in the Field: Mold, Plant, Animal and Environment Interactions). Asociación Mexicana de Especialistas en Nutrición Animal. Puerto Vallarta, Mexico: AMENA.
  More info

  Mexican Association of Animal Nutritionists annual meeting - invited talk.
• Diaz, D. (2016, April). Efecto de tricocenos en la producción avícola y estrategias de control. ANECA (Asociacion Nacional de Especialistas en Ciencias Avicolas). Ixtapa Mexico: ANECA.
• Diaz, D. (2016, February). A Multidisciplinary Approach to Prevention, Assessment, and Mitigation of Mycotoxicosis in the Dairy Industry. Southwest Nutrition Conference.
• Diaz, D. (2016, June). Mycotoxins and Mycotoxicosis in the Dairy Industry. Nutriad Dairy Seminars. Jerome & Burley Idaho: Nutriad.
• Diaz, D. (2016, June). The use of Bio-competitive Products for Aflatoxin Management. New Technologies for Arizona Field Crops Workshop. Maricopa Arizona: CALS Cooperative Extension.
• Diaz, D. (2016, March). Mold and Plant Interaction in Aflatoxin Contamination. The 2nd Arizona Alfalfa & Forage Crops Workshop. Maricopa AZ: CALS Cooperative Extension.
• Diaz, D. (2016, March). University of Arizona Dairy Extension Programs. Arizona Agricultural Experience. Tempe AZ: Pinal 40.
• Diaz, D. (2016, October). Nutritional Toxicology in the Dairy Industry: Feed Quality and Mycotoxins. World Nutrition Forum. Vancouver Canada.
• Diaz, D. (2016, October). Pre and Post Harvest Mycotoxin Prevention Programs. University of Hawaii Manoa Seminar for Department of Human Nutrition, Food and Animal Sciences. Manoa Hawaii: University of Hawaii Manoa.
• Diaz, D. (2016, September). Dairy Extension Programs at the University of Arizona. Greenly County Extension Advisory Board Meeting. Duncan Arizona: Greenly Country Cooperative Extension.
  More info

  Tour of Lunt Dairy and a gave a presentation to the board about the state of the dairy industry in Arizona and our extension programs.

Poster Presentations

• Ottman, M. J., Norton, E. R., Mostafa, A. M., Andrade Sanchez, P., Grijalva, P., Diaz, D., & Evancho, B. E. (2020, October). Agronomic Assessment of Corn Silage Forage Production in Buckeye, and Casa Grande Arizona: Part of the Arizona Dairy Forage Initiative. Arizona Cooperative Extension 2020 Virtual Conference. Virtual: Arizona Cooperative Extension.
• Diaz, D. (2019, June). Evaluating skeletal muscle and mammary tissue energy expenditure during heat stress for lactating Holstein cows. ASAS Western Section Annual Meeting. Boise, Idaho.
• Diaz, D., Abrell, L. M., Ellsworth, P. C., Hall, G., & Pier, N. (2019, August). Blister Beetles of Arizona. University of Arizona Cooperative Extension Annual Conference. Tucson Arizona: Cooperative Extension - University of Arizona.
• Diaz, D., Andrade Sanchez, P., Mostafa, A. M., Evancho, B. E., Ottman, M. J., & Norton, R. (2019, April). Arizona Extension Dairy Forage Initiative: Agronomic Assessment of Common Forage Commodities in the State of Arizona. 2019 ALVSCE Poster Forum. Tucson Arizona.
• Ottman, M. J., Diaz, D., Norton, R., Andrade Sanchez, P., Evancho, B. E., Mostafa, A. M., Evancho, B. E., Mostafa, A. M., Norton, R., Andrade Sanchez, P., Ottman, M. J., & Diaz, D. (2019, August). Evaluation of agronomic needs to improve our extension educational programs to dairy forage growers in the state.. 2019 Arizona Cooperative Extension Conference. Tucson Arizona: University of Arizona Cooperative Extension.
• Diaz, D., & Vander Poel, M. (2018, April). Evaluation of the efficacy of a feed supplement (BeefAbate) in attenuating the effects of heat stress on growing steers.. Plains Nutrition Council Annual Meeting. San Antonio: PNC.
• Diaz, D., Greene, E. A., & Wright, A. D. (2016, October). Statewide survey asa tool for identifying dairy-related cooperative extension program priorities for the state of Arizona. NACAA Western Region Conference. Kailua-Kona Hawaii: NACAA.

Others

• Diaz, D., Garcia, S. R., & Wulf, D. M. (2020, May). How to Butcher a Pig (On Farm Pig Harvest Procedures). YouTube. https://www.youtube.com/watch?v=ojctijm2Tgo
  More info

  Due to COVID shut downs at several pork processing plants, there was much demand for science-based procedures for on-farm pig harvest. This video was produced and published with the support of the National Pork Board.