Katie Hazlewood

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Scholarly Contributions

Journals/Publications

• Brischke, A. S., & Hazlewood, K. (2024). Animal Disease Traceability Rule Affecting Cattle. . University of Arizona Cooperative.
• Hazlewood, K., Zumbaugh, C., Jones, C., Atkinson, E., Tingler, H., Inhuber, V., Brouk, M., Antony, R., & Titgemeyer, E. (2024). Effect of Guanidinoacetic Acid Supplementation on the Performance of Calves Fed Milk Replacer. Animals, 14(19). doi:10.3390/ani14192757
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  Guanidinoacetic acid (GAA) is the direct precursor to creatine, which serves as an energy reserve mechanism in the body. We evaluated the effects of GAA supplementation on the growth performance of calves fed milk replacer. Forty-five Holstein–Angus steer calves (40.9 kg, approximately 1 week old) were assigned to 1 of 3 treatments to assess growth performance and data from 41 calves were analyzed. Treatments were provided in the milk replacer for 42 d and included 0, 1, or 2 g GAA/d. Calves were fed 2.84 L milk replacer twice daily with ad libitum access to starter feed and water. Treatments ended on day 42 prior to a 17-day weaning period. Supplementation of GAA increased (p < 0.01) plasma concentrations of GAA (0.42, 0.51, and 0.67 mg/L for 0, 1, and 2 g GAA/d, respectively) and creatine (18.7, 22.1, and 24.4 mg/L for 0, 1, and 2 g GAA/d, respectively). Bodyweight tended to linearly increase (p = 0.09) with increasing GAA on d 59 (91.2, 98.3, and 98.6 kg for 0, 1, and 2 g GAA/d, respectively). Daily gains from day 0 to 59 tended to increase with GAA provision (p = 0.09; 0.86, 0.97, and 0.98 kg/d for 0, 1, and 2 g GAA/d, respectively). Starter feed dry matter intake tended to linearly increase (p = 0.06) with GAA supplementation (0.201, 0.278, and 0.286 kg/d for 0, 1, and 2 g GAA/d, respectively). Treatments providing 1 and 2 g GAA/d affected performance similarly. No differences among treatments were observed for health (respiratory and fecal) scores during the application of treatments or during the subsequent weaning period. The inclusion of GAA in milk replacer tended to increase the gain of calves, and this was associated with elevated starter feed intake.

Proceedings Publications

• Brawley, N. Q., Hazlewood, K., & Wright, A. D. (2024, July). The Who, What, When, Where, Why, and How of Arizona Livestock Incident Response Team. In University of Arizona Cooperative Extension Annual Conference.
• Hazlewood, K. (2024, September). Yavapai County Livestock Producer Program Area Needs. . In 2024 Chad Reid National Association of County Agricultural Agents Western Region Professional Improvement Conference, 30.
• Hazlewood, K., Brawley, N. Q., Brischke, A. S., & Hall, A. L. (2024, December). Artificial Insemination Clinics for Cattle Producers in Arizona. In 9th National Grazing Lands Conference.
• Hazlewood, K., Brawley, N. Q., Brischke, A. S., & Hall, A. L. (2024, July). Artificial Insemination Clinics for Cattle Producers in Arizona. In University of Arizona Cooperative Extension Annual.

Presentations

• Hazlewood, K. (2024). Herd Health and Nutrition. Spring/Fall Hands-On Artificial Insemination Clinic. Rimrock, AZ.
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  Presentation on relevant cattle health and nutrition management practices for producers learning artificial insemination techniques to implement into their cattle herds.
• Hazlewood, K. (2024, November). Careers in Agriculture. Invited talk at Yavapai College AGS 261 & 282. Chino Valley, AZ.
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  Presentation on the different aspects of agriculture and the possible jobs and careers in those related fields.
• Hazlewood, K. (2024, October). Yavapai County Livestock Program. October 2024 Yavapai County Extension Advisory Board Meeting. Prescott, AZ.
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  Overview of the programming and plan for the livestock extension program by this Agent in Yavapai County to the Yavapai County Extension Advisory Board.

Poster Presentations

• Brawley, N. Q., Hazlewood, K., & Wright, A. D. (2024, July). The Who, What, When, Where, Why, and How of Arizona Livestock Incident Response Team. Arizona Cooperative Extension Annual Conference. Tucson, AZ.
• Hazlewood, K. (2024, September). Yavapai County Livestock Producer Program Area Needs. 2024 Chad Reid National Association of County Agricultural Agents Western Region Professional Improvement Conference. Sandpoint, ID.
• Hazlewood, K., Brawley, N. Q., Brischke, A. S., & Hall, A. L. (2024, December). Artificial Insemination Clinics for Cattle Producers in Arizona. . 9th National Grazing Lands Conference. Tucson, AZ.
• Hazlewood, K., Brawley, N. Q., Brischke, A. S., & Hall, A. L. (2024, July). Artificial Insemination Clinics for Cattle Producers in Arizona. . University of Arizona Cooperative Extension Annual Conference. Tucson, AZ.