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Division of Agriculture and Natural Resources
Division of Agriculture and Natural Resources
Division of Agriculture and Natural Resources
University of California
Division of Agriculture and Natural Resources

Betsy M. Karle

Photo of Betsy M Karle
Dairy Advisor & County Director
UC Cooperative Extension Glenn County
821 E. South Street
Orland, CA 95963
(530) 865-1156
bmkarle@ucanr.edu Create VCard

Also in:
Butte County
Tehama County
Shasta County
Sutter-Yuba Counties
Yolo County
Capitol Corridor MCP Cooperative Extension
Siskiyou County
Colusa County
Sacramento County
Solano County

Education

M.S. Ecology, UC Davis. 2003
B.S. Agriculture Systems & Environment, UC Davis. 1999

Awards

Specialty

preweaned calf management, antimicrobial stewardship, environmental sustainability

Areas of Expertise (click to see all ANR academics with this expertise)

Bibliography

Peer Reviewed

  • Portillo, R. (In Press). Effect of a dairy farmworker stewardship training program on antimicrobial drug usage in dairy cows. Journal of Dairy Science.
  • Abdelfattah, E.M.; Aly, S.S.; Lehenbauer, T.W.; Karle, B.M. (In Press). Effects of simplified group housing on behavior, growth performance and health of preweaned dairy calves on a California dairy. Journal of Dairy Science.
  • Davy, J.S.; Doran, M.; Macon, D.; Karle, B.M.; Nader, G.; Ingram, R.; Swanepoel, N.; Robinson, P. (In Press). Improving the feeding value of rice straw. California Agriculture. February 2024.
  • Garzon, A.; Portillo, R.; Habing, G.; Silva del Rio, N.; Karle, B.; Pereira, R. (2024). Antimicrobial resistance of Escherichia coli from dairy farms participating in an antimicrobial stewardship educational program for farm employees. Journal of Dairy Science. 107:3, 1645-1655. March 2024.
  • Garzon, A.; Portillo, R.; Habing, G.; Silva-del-Rio, N.; Karle, B.M.; Pereira, R.V. (2023). Antimicrobial stewardship on the dairy: Evaluating an on-farm framework for training farmworkers. Journal of Dairy Science. 106:6, 4171-4183.
  • Breen, M.J.; Abdelfattah, E.M.; Karle, B.M.; Byrne, B.A.; Lehenbauer, T.W.; Aly, S.S. (2023). Effect of Group Housing of Preweaned Dairy Calves: Health and Fecal Commensal Antimicrobial Resistance Outcomes. Antibiotics. 12:6, 1019.
  • Basbas, C.; Garzon, A.; Schlesener, C.; van Heule, M.; Profeta, R.; Weimer, B.C.; Silva-del-Rio, N.; Byrne, B.; Karle, B.; Aly, S.; Lima, F.; Pereira, R. (2023). Unveiling the microbiome during post-partum uterine infection: a deep shotgun sequencing approach to characterize the dairy cow uterine microbiome. Animal Microbiome. 5:59. November 2023.
  • Basbas, C.; Aly, S.; Okello, E.; Karle, B.; Lehenbauer, T.; Williams, D.; Ganda, E.; Wiedmann, M.; Pereira, R.V. (2022). Effect of Intramammary Dry Cow Antimicrobial Treatment on Fresh Cow's Milk Microbiota in California Commercial Dairies. Antibiotics. 11, 963.
  • Aly, S.S.; Okello, E.; ElAshmawy, W.R.; Williams, D.R.; Anderson, R.J.; Rossitto, P.; Tonooka, K.; Glenn, K.; Karle, B.; Lehenbauer, T.W. (2022). Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Clinical Mastitis and Culling Outcomes. Antibiotics. 11, 954.
  • ElAshmawy, W.R.; Okello, E.; Williams, D.; Anderson, R.J.; Karle, B.M.; Lehenbauer, T.; Aly, S. (2022). Effectiveness of Intramammary Antibiotics, Internal Teat Sealants, or Both at Dry-Off in Dairy Cows: Milk Production and Somatic Cell Count Outcomes. Vet Sci. 9:10, 559.
  • Basbas, C; Garzon, A; Silva-Del-Rio, N; Byrne, BA; Karle, B; Aly, SS; Champagne, JD; Williams, DR; Lima, FS: Machado; Pereira, RV (2022). Evaluation of antimicrobial resistance and risk factors for recovery of intrauterine Escherichia coli from cows with metritis on California commercial dairy farms. Scientific Reports. 12, 13937.
  • Abdelfattah, E.M.; Ekong, P.S.; Okello, E.; Williams, D.R.; Karle, B.; Lehenbauer, T.W.; Aly, S.S. (2022). Factors Associated with Antimicrobial Stewardship Practices on California Dairies: One Year Post Senate Bill 27. Antibiotics. 11:2, 165-171. January 25, 2022. https://www.mdpi.com/2079-6382/11/2/165
  • Miller, C.; Meyer, D.; Heguy, J.; Karle, B.; Price, P. (2022). Forage Harvested for Silage: Methods to Measure Yield and Nitrogen Composition. UC ANR 8000 Series. 8713. https://anrcatalog.ucanr.edu/pdf/8713.pdf
  • Miller, C.; Meyer, D.; Heguy, J.; Karle, B.; Price, P. (2022). Methods for Collecting Representative Samples of Solid Manure for Nitrogen Analysis. UC ANR 8000 Series. 8715. https://anrcatalog.ucanr.edu/pdf/8715.pdf
  • Cheong, S.; Francesco, J.D.; Lee, K.; Van Vleck Pereira, R.; Black, R.; Karle, B.; Lema, M.; Pires, A.F.A. (2022). Survey of Management Practices and Farmers’ Perceptions of Diseases on Organic Dairy Cattle Farms in California. Animals. 12, 2526.
  • Ekong, P.S.; Abdelfattah, E.M.; Okello, E; Williams, D.R.; Lehenbauer, T.W.; Karle, B.M.; Rowe, J.D.; Marshall, E.S.; Aly, S.S. (2021). 2018 Survey of antimicrobial drug use and stewardship practices in adult cows on California dairies: Immediate Post-Senate Bill 27 Impact. Peer J.
  • Ekong, P.S.; Abdelfattah, E.M.; Okello, E; Williams, D.R.; Lehenbauer, T.W.; Karle, B.M.; Rowe, J.D.; Marshall, E.S.; Aly, S.S. (2021). 2018 Survey of antimicrobial drug use and stewardship practices in adult cows on conventional California dairies: post-Senate Bill 27. Peer J. 10:7717, 11515.
  • Abdelfattah, Essam; Ekong, Pius; Okello, Emmanuel; Williams, Deniece; Karle, Betsy; Rowe, Joan; Marshall, Edith; Lehenbauer, Terry; Aly, Sharif (2021). 2019 Survey of Antimicrobial Drug Use and Stewardship Practices in Adult Cows on California Dairies: Post Senate Bill 27. Microorganisms. 2021:9, 1507.
  • Abdelfattah, E.M.; Ekong, P.S.; Okello, E; Chamchoy, T.; Karle, B.M.; Black, R.A.; Sheedy, D.; ElAshmawy, W.R.; Williams, D.R.; Califano, D.; Duran Tovar, L.F.; Ongom, J.; Lehenbauer, T.W.; Byrne, B.A.; Aly, S.S. (2021). Epidemiology of antimicrobial resistance (AMR) on California dairies: descriptive and cluster analyses of AMR phenotype of fecal commensal bacteria isolated from adult cows. Peer J. 9:e11108. https://peerj.com/articles/11108/#
  • Cella, Elisa; Okello, Emmanuel; Rossitto, Paul; Cenci-Goga, Beniamino; Grispoldi, Luca; Williams, Deniece; Sheedy, David; Pereira, Richard; Karle, Betsy; Lehenbauer, Terry; Aly, Sharif (2021). Estimating the Rates of Acquisition and loss of Resistance of Enterobacteriaceae to Antimicrobial Drugs in Pre-Weaned Dairy Calves. Microorganisms. 2021:9, 2103.
  • Maier, G.U.; Love, W.J.; Karle, B.M.; Dubrovsky, S.A.; Williams, D.; Champagne, J.D.; Anderson, R.A.; Rowe, J.D.; Lehenbauer, T.W. Van Eenenaamm; Aly, S.S. (2020). A novel Risk Assessment tool for Bovine Respiratory Disease in preweaned dairy calves. Journal of Dairy Science. 103:10, 9301-9317.
  • Aly, S.S.; Karle, B.M.; Williams, D.R.; Maier, G.U.; Dubrovsky, S. (2020). Components of a risk assessment tool for prevention and control of bovine respiratory disease in preweaned dairy calves. Animal Health Research Reviews. 21:2, 153-159. December 2020.
  • Dubrovsky, S.A.; Van Eenenaamm, A.L.; Aly, S.S.; Karle, B.M.; Rossitto, P.V.; Overton, M.L.; Lehenbauer, T.W.; Fadel, J.G. (2020). Preweaning cost of bovine respiratory disease (BRD) and cost-benefit of implementation of preventative measures in calves on California dairies: The BRD 10K study. Journal of Dairy Science. 103:2, 1583-1597.
  • Li, X.; Jackson, W.; Aly, S; Karle, B.M.; Silva del Rio, N.; Nguyen, T.; Xiao, C.; Atwill, E.R. (2019). A Cross-Sectional Study of prevalence and Species of Cryptosporidium spp. in Preweaned Calves and Associated Management Risk Factors on Dairies in Central California, USA. J Vet Med Res. 6:1, 1171-1180. January 24. https://www.jscimedcentral.com/VeterinaryMedicine/veterinarymedicine-6-1171.pdf
  • Dubrovsky, S.A.; Van Eenennaam, A.L.; Karle, B.M.; Rossitto, P.V.; Lehenbauer, T.W.; Aly, S.S. (2019). Bovine respiratory disease (BRD) cause-specific and overall mortality in preweaned calves on California dairies: The BRD 10K study. Journal of Dairy Science. 102:8, 7320-7328.
  • Maier, Gabriele U.; Rowe, Joan D.; Lehenbauer, Terry W.; Karle, Betsy M.; Williams, Deniece R.; Champagne, John D.; Aly, Sharif S. (2019). "Development of a clinical scoring system for bovine respiratory disease in weaned dairy calves." Journal of Dairy Science 102(8): 7329-7344.
  • Dubrovsky, S. A.; Van Eenennaam, A. L.; Karle, B. M.; Rossitto, P. V.; Lehenbauer, T. W.; Aly, S. S. (2019). "Epidemiology of bovine respiratory disease (BRD) in preweaned calves on California dairies: The BRD 10K study." Journal of Dairy Science 102(8): 7306-7319.
  • Belmar, M.; Aly, S.S.; Karle, B.M.; Pereira, R.V. (2019). Evaluation of four commercial tests for detecting ceftiofur in waste milk bulk tank samples. Plos One. 14:11. November 12, 2019.
  • Hagey, Jill V.; Bhatnagar, Srijak; Heguy, Jennifer M.; Karle, Betsy M.; Price, Patricia L.; Meyer, Deanne; Maga, Elizabeth A. (2019). "Fecal Microbial Communities in a Large Representative Cohort of California Dairy Cows." Frontiers in Microbiology 10(1093)
  • Maier, G. U.; Love, W. J.; Karle, B. M.; Dubrovsky, S. A.; Williams, D. R.; Champagne, J. D.; Anderson, R. J.; Rowe, J. D.; Lehenbauer, T. W.; Van Eenennaam, A. L.; Aly, S. S. (2019). "Management factors associated with bovine respiratory disease in preweaned calves on California dairies: The BRD 100 study." Journal of Dairy Science 102(8): 7288-7305.
  • Martins, J. P. N.; Karle, B. M.; Heguy, J. M. (2019). "Needs assessment for cooperative extension dairy programs in California." Journal of Dairy Science 102(8): 7597-7607.
  • Miller, Christine M.; Heguy, Jennifer M.; Karle, Betsy M.; Price, Patricia L.; Meyer, Deane. (2019). Optimizing accuracy of sampling protocols to measure nutrient content of solid manure. Waste Management. 85, 121-130. 2/15/19.
  • Karle, B. M.; Maier, G. U.; Love, W. J.; Dubrovsky, S. A.; Williams, D. R.; Anderson, R. J.; Van Eenennaam, A. L.; Lehenbauer, T. W.; Aly, S. S. (2019). "Regional management practices and prevalence of bovine respiratory disease in California's preweaned dairy calves." Journal of Dairy Science 102(8): 7583-7596.
  • Meyer, D.; Karle, B.M.; Heguy, J.M; Lewis, D.J.; Stackhouse, J.W.; Mullinax, D.D (2019). UC-industry-agency partnerships influence and help implement dairy water quality policy. California Agriculture. 73:1, 40-47. http://calag.ucanr.edu
  • Tempini, PN; Aly, SS; Karle, BM; Pereira, RV (2018). Multidrug residues and antimicrobial resistance patterns in waste milk from dairy farms in Central California. Journal of Dairy Science. 101:9, 8110-8122. September 1, 2018.
  • Miller, Christine M.; Fadel, James G.; Heguy, Jennifer M.; Karle, Betsy M.; Price, Patricia L.; Meyer, Deane. (2018). Optimizing accuracy of protocols for measuring dry matter and nutrient yield of forage crops. Science of the Total Environment. 624, 180-188. May 15, 2018.
  • Love, W. J.; Lehenbauer, T. W.; Karle, B. M.; Hulbert, Lindsey E.; Anderson, Randall J.; Van Eenennaam, A. L.; Farver, T. B.; Aly, S. S. (2016). "Survey of management practices related to bovine respiratory disease in preweaned calves on California dairies." Journal of Dairy Science 99(2): 1483-1494.
  • Davy, J.S.; Karle, B.M.; Kyser, G.B.; DiTomaso, J.M.; Rinella, M.J. (2015). "Broadleaf weed control in irrigated pasture containing Trifolium repens." Crop and Pasture Science 66: 985-991.
  • Meyer, D.; Price, P.; Rossow, H.; Silva del Rio, N.; Karle, B.M.; Robinson, P; DePeters, E.; Fadel, J. (2011). "Survey of dairy housing and manure management practices in California." Journal of Dairy Science 94: 4744-4750.
  • Harter, T.; Atwill, E.R.; Hou, L.; Karle, B.M.; Tate, K.W. (2008). "Developing risk models of Cryptosporidium transport in soils from vegetated, tilted soil box experiments." Journal of Environmental Quality 37: 245-258.
  • Lewis, D.J.; Atwill, E.R.; Lennox, M.; Hou, L.; Karle, B.M.; Tate, K.W. (2005). "Linking on-farm dairy management practices to storm-flow fecal coliform loading for California coastal watersheds." Environmental Monitoring and Assessment 107: 407-425.
  • Lile, D.; Tate, K.W.; Lancaster, D.; Karle, B.M. (2003). "Stubble height standards for Sierra Nevada meadows can be difficult to meet." California Agriculture 57: 60-64.
  • Atwill, E.R.; Hou, L.; Karle, B.M.; Harter, T.; Tate, K.W.; Dahlgren, R (2002). "Transport of Cryptosporidium parvum oocysts through vegetated buffer strips and estimated filtration efficiency." Applied and Environmental Microbiology 68: 5517-5527.

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