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United States Department of Agriculture

Agricultural Research Service

Thomas Z Davis (Zane)
Research Molecular Biologist


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Comparative oral dose toxicokinetics of sodium selenite and selenomethionine -
Effects of high selenium forages on reproduction in sheep -
Davis, T.Z. 2016. Effects of high selenium forages on reproduction in sheep. American Society of Animal Science Annual Meeting. pp. 128 - https://asas.confex.com/asas/jam2016/webprogram/Paper18038.html.
White snakeroot poisoning in goats: Variations in toxicity with different plant chemotypes Reprint Icon -
Davis, T.Z., Stegelmeier, B.L., Lee, S.T., Green, B.T., Evans, T.J., Grum, D.S., Buck, S., Meyerholtz, K.A. 2016. White snakeroot poisoning in goats: Variations in toxicity with different plant chemotypes. Research in Veterinary Science. 106:29-36.
Rumen microorganisms decrease bioavailability of inorganic selenium supplements -
Galbraith, M.L., Vorachek, W.R., Estill, C.T., Whanger, P.D., Bobe, G., Davis, T.Z., Hall, J.A. 2016. Rumen microorganisms decrease bioavailability of inorganic selenium supplements. Biological Trace Element Research. 171(2):338-343.
Evaluation of the stability of benzofuran ketones in rayless goldenrod (Isocoma pluriflora) and white snakeroot (Ageratina altissima) under different storage conditions -
An evaluation of the toxicity of white snakeroot (Ageratina altissima) and rayless goldenrod (Isocoma pluriflora) in a lactating mouse model -
Differences between Angus and Holstein cattle in the Lupinus leucophyllus induced inhibition of fetal activity Reprint Icon -
Green, B.T., Panter, K.E., Lee, S.T., Welch, K.D., Pfister, J.A., Gardner, D.R., Stegelmeier, B.L., Davis, T.Z. 2015. Differences between Angus and Holstein cattle in the Lupinus leucophyllus induced inhibition of fetal activity. Toxicon. 106:1-6.
Decreased reproductive rates in sheep fed a high selenium diet -
A global perspective of selenium deficiency and toxicity -
Davis, T.Z., Panter, K.E., Hall, J.O. 2015. A global perspective of selenium deficiency and toxicity. International Symposium on Poisonous Plants. 9:17-24.
Identification of the toxic components in white snakeroot (Ageratina altissima) -
Davis, T.Z., Lee, S.T., Collett, M.G., Stegelmeier, B.L., Green, B.T., Grum, D.S. 2015. Identification of the toxic components in white snakeroot (Ageratina altissima). International Symposium on Poisonous Plants. 9:194-200.
Species susceptibility to locoweed poisoning and evaluation of chicks as a small animal model of poisoning -
Stegelmeier, B.L., Davis, T.Z., Welch, K.D., Green, B.T., Gardner, D.R., Lee, S.T., Pfister, J.A., Cook, D., Panter, K.E. 2015. Species susceptibility to locoweed poisoning and evaluation of chicks as a small animal model of poisoning. International Symposium on Poisonous Plants. 9:126-129.
New dehydropyrrolizidine alkaloids isolated from a Crotalaria and two Cryptantha species -
Colegate, S.M., Gardner, D.R., Davis, T.Z., Joy, R.J., Betz, J.M., Panter, K.E. 2015. New dehydropyrrolizidine alkaloids isolated from a Crotalaria and two Cryptantha species. International Symposium on Poisonous Plants. 9:212-218.
The clearance of delphinium alkaloids from the serum of cattle -
Green, B.T., Welch, K.D., Gardner, D.R., Davis, T.Z., Stegelmeier, B.L., Lee, S.T. 2015. The clearance of delphinium alkaloids from the serum of cattle. International Symposium on Poisonous Plants. 9:296-306.
Elk (Cervus elaphus canadensis) preference for feeds varying in selenium concentration -
Pfister, J.A., Davis, T.Z., Hall, J.O., Stegelmeier, B.L., Panter, K.E. 2015. Elk (Cervus elaphus canadensis) preference for feeds varying in selenium concentration. Journal of Animal Science. doi: 10.2527/jas2015-9008.
The serum concentrations of lupine alkaloids in orally-dosed Holstein cattle Reprint Icon -
Green, B.T., Lee, S.T., Welch, K.D., Gardner, D.R., Stegelmeier, B.L., Davis, T.Z. 2015. The serum concentrations of lupine alkaloids in orally-dosed Holstein cattle. Research in Veterinary Science. 100:239-244.
Toxicity of White Snakeroot (Ageratina altissima) and chemical extracts of White Snakeroot in goats -
Davis, T.Z., Lee, S.T., Collett, M.G., Stegelmeier, B.L., Green, B.T., Buck, S.R., Pfister, J.A. 2015. Toxicity of White Snakeroot (Ageratina altissima) and chemical extracts of White Snakeroot in goats. Journal of Agricultural and Food Chemistry. 63(7):2092-2097.
A survey of tremetone, dehydrotremetone and structurally related compounds in Isocoma spp. (Goldenbush) in the southwestern United States Reprint Icon -
Lee, S.T., Cook, D., Davis, T.Z., Gardner, D.R., Johnson, R.L., Stonecipher, C.A. 2015. A survey of tremetone, dehydrotremetone and structurally related compounds in Isocoma spp. (Goldenbush) in the southwestern United States. Journal of Agricultural and Food Chemistry. 63(3):872-879.
Analysis in horse hair as a means of evaluating selenium toxicoses and long-term exposures Reprint Icon -
Davis, T.Z., Stegelmeier, B.L., Hall, J.O. 2014. Analysis in horse hair as a means of evaluating selenium toxicoses and long-term exposures. Journal of Agricultural and Food Chemistry. 62(30):7393-7397.
Germination, biomass production, and root growth in range restoration grasses on Se overburden soils -
Physiological and serum biochemical changes associated with rayless goldenrod (Isocoma pluriflora) poisoning in goats -
Davis, T.Z., Green, B.T., Stegelmeier, B.L., Lee, S.T., Welch, K.D., Pfister, J.A. 2013. Physiological and serum biochemical changes associated with rayless goldenrod (Isocoma pluriflora) poisoning in goats. Toxicon. 76:247-254.
Evaluation of the respiratory elimination kinetics of selenate and Se-methylselenocysteine after oral administration in lambs -
Davis, T.Z., Stegelmeier, B.L., Green, B.T., Welch, K.D., Hall, J.O. 2013. Evaluation of the respiratory elimination kinetics of selenate and Se-methylselenocysteine after oral administration in lambs. Research in Veterinary Science. 95(3):1163-1168.
Effect of selenium concentration on feed preferences by cattle and sheep Reprint Icon -
Pfister, J.A., Davis, T.Z., Hall, J.O. 2013. Effect of selenium concentration on feed preferences by cattle and sheep. Journal of Animal Science. 91(12):5970-5980.
Experimental rayless goldenrod (Isocoma pluriflora) toxicosis in horses -
Davis, T.Z., Stegelmeier, B.L., Lee, S.T., Green, B.T., Hall, J.O. 2013. Experimental rayless goldenrod (Isocoma pluriflora) toxicosis in horses. Toxicon. 73:88-95.
Comparative oral dose toxicokinetics of selenium compounds commonly found in selenium accumulator plants -
Davis, T.Z., Stegelmeier, B.L., Welch, K.D., Pfister, J.A., Panter, K.E., Hall, J.O. 2013. Comparative oral dose toxicokinetics of selenium compounds commonly found in selenium accumulator plants. Journal of Animal Science. 91(9):4501-4509.
Alkaloid profiles of Dermatophyllum arizonicum, Dermatophllum gypsophilum, Dermatophyllum secundiflorum, Styphnolobium affine, and Styphnolobium japonicum previously classified as Sophora species Reprint Icon -
Lee, S.T., Cook, D., Molyneux, R.J., Davis, T.Z., Gardner, D.R. 2013. Alkaloid profiles of Dermatophyllum arizonicum, Dermatophllum gypsophilum, Dermatophyllum secundiflorum, Styphnolobium affine, and Styphnolobium japonicum previously classified as Sophora species. Biochemical Systematics and Ecology. 49:87-93.
Identification of a lycopsamine-N-oxide chemotype of Amsinckia intermedia -
Colegate, S.M., Gardner, D.R., Davis, T.Z., Welsh, S.L., Betz, J.M., Panter, K.E. 2013. Identification of a lycopsamine-N-oxide chemotype of Amsinckia intermedia. Biochemical Systematics and Ecology. 48: 132-5.
Addition of high concentration of inorganic selenium in orchardgrass (Dactylis glomerata L.) hay diet does not interfere with microbial fermentation in mixed ruminal microorganisms in continuous cultures -
Eun, J., Davis, T.Z., Vera, J., Miller, D.N., Panter, K.E., Zobell, D. 2013. Addition of high concentration of inorganic selenium in orchardgrass (Dactylis glomerata L.) hay diet does not interfere with microbial fermentation in mixed ruminal microorganisms in continuous cultures. Professional Animal Scientist. 29(1): 39-45.
Dehydropyrrolizidine alkaloids in two Cryptantha species: Including two new open chain diesters one of which is amphoteric -
Colegate, S.M., Gardner, D.R., Davis, T.Z., Betz, J.M., Panter, K.E. 2013. Dehydropyrrolizidine alkaloids in two Cryptantha species: Including two new open chain diesters one of which is amphoteric. Phytochemical Analysis. 24: 201-12.
The resolution of rayless goldenrod (Isocoma pluriflora) poisoning in goats -
Stegelmeier, B.L., Davis, T.Z., Green, B.T., Lee, S.T., Hall, J.O. 2013. The resolution of rayless goldenrod (Isocoma pluriflora) poisoning in goats. International Journal of Poisonous Plant Research. 2:27-33.
Evaluation of drying methods and toxicity of rayless goldenrod (Isocoma pluriflora) and white snakeroot (Ageratina altissima) in goats -
Lee, S.T., Davis, T.Z., Cook, D., Stegelmeier, B.L. 2012. Evaluation of drying methods and toxicity of rayless goldenrod (Isocoma pluriflora) and white snakeroot (Ageratina altissima) in goats. Journal of Agricultural and Food Chemistry. 60(19): 4849-53.
Poisonous Plants of the United States Reprint Icon -
Panter, K.E., Welch, K.D., Gardner, D.R., Lee, S.T., Green, B.T., Pfister, J.A., Cook, D., Davis, T.Z., Stegelmeier, B.L. 2012. Poisonous Plants of the United States. In: Guptra, R.C., editor. Veterinary Toxicology: Basic and Clinical Principles. 2nd edition. Boston, MA: Academic Press. p. 1031-79.
Benzofuran ketone dosage-dependent rayless goldenrod (Isocoma pluriflora) toxicosis in a caprine model -
Toxicokinetics and pathology of plant-associated acute selenium toxicosis in steers -
Davis, T.Z., Stegelmeier, B.L., Panter, K.E., Cook, D., Gardner, D.R., Hall, J.O. 2012. Toxicokinetics and pathology of plant-associated acute selenium toxicosis in steers. Journal of Veterinary Diagnostic Investigation. 24(2): 319-27.
Targeted grazing: Applying the research to the land Reprint Icon -
Frost, R., Walker, J., Madsen, C., Holes, R., Lehfeldt, J., Cunningham, J., Voth, K., Welling, B., Davis, T.Z., Bradford, D., Malot, J., Sullivan, J. 2012. Targeted grazing: Applying the research to the land. Rangelands. 34(1): 2-10.
Selenium -
Davis, T.Z., Hall, J.O. 2011. Selenium. In: Gupta, R.C., editor. Reproductive and Developmental Toxicology. San Diego, CA. Academic Press. p. 61-8.
Effect of MDL-type alkaloids on tall larkspur toxicosis -
Welch, K.D., Gardner, D.R., Panter, K.E., Green, B.T., Cook, D., Pfister, J.A., Stegelmeier, B.L., Davis, T.Z. 2011. Effect of MDL-type alkaloids on tall larkspur toxicosis. In: Riet-Correa, F., Pfister, J., Schild, A.L., Wierenga, T., editors. Poisoning by Plants, Mycotoxins, and Related Toxins. Cambridge, MA: CAB International. 94:540-9. DOI: 10.1079/9781845938338.0540.
Lupine-Induced 'Crooked Calf Disease' in Washington and Oregon: Identification of the alkaloid profiles of Lupinus sericeus, Lupinus sulphureus, and Lupinus leucophyllus -
Cook, D., Lee, S.T., Gardner, D.R., Pfister, J.A., Welch, K.D., Green, B.T., Davis, T.Z., Panter, K.E. 2011. Lupine-Induced 'Crooked Calf Disease' in Washington and Oregon: Identification of the alkaloid profiles of Lupinus sericeus, Lupinus sulphureus and Lupinus leucophyllus. In: Riet-Correa, F., Pfister, J., Schild, A.L., Wierenga, T., editors. Poisoning by Plants, Mycotoxins, and Related Toxins. Cambridge, MA. CAB International. 97:566-71.
Tremetone and structurally related compounds in white snakeroot (Ageratina altissima): A plant associated with trembles and milk sickness -
Lee, S.T., Davis, T.Z., Gardner, D.R., Colegate, S.M., Cook, D., Green, B.T., Meyerholtz, K.A., Wilson, C.R., Stegelmeier, B.L., Evans, T.J. 2010. Tremetone and structurally related compounds in white snakeroot (Ageratina altissima): A plant associated with trembles and milk sickness. Journal of Agricultural and Food Chemistry. 58(15):8560-65. DOI: 10.1021/jf1012456.
A toxicokinetic comparison of norditerpenoid alkaloids from Delphinium barbeyi and D. glaucescens in cattle Reprint Icon -
Green, B.T., Welch, K.D., Gardner, D.R., Stegelmeier, B.L., Pfister, J.A., Cook, D., Davis, T.Z. 2011. A toxicokinetic comparison of norditerpenoid alkaloids from Delphinium barbeyi and D. glaucescens in cattle. Journal of Applied Toxicology. 31(1):20-6. DOI 10.1002/jat.1563.
Acute toxicity of selenium compounds commonly found in selenium-accumulator plants -
Davis, T.Z., Stegelmeier, B.L., Green, B.T., Welch, K.D., Panter, K.E., Hall, J.O. 2011. Acute toxicity of selenium compounds commonly found in selenium-accumulator plants. In: Riet-Correa, F., Pfister, J., Schild, A.L., Wierenga, T., editors. Poisoning by Plants, Mycotoxins, and Related Toxins. Cambridge, MA. CAB International. 91:525-31.
Experimemntal Rayless Goldenrod (Isocoma pluriflora) Toxicosis in Goats -
Stegelmeier, B.L., Davis, T.Z., Green, B.T., Lee, S.T., Hall, J.O. 2010. Experimemntal Rayless Goldenrod (Isocoma pluriflora) Toxicosis in Goats. Journal of Veterinary Diagnostic Investigation 22:570-577.
Plants teratogenic to livestock in the United States -
Panter, K.E., Welch, K.D., Lee, S.T., Gardner, D.R., Stegelmeier, B.L., Ralphs, M.H., Davis, T.Z., Green, B.T., Pfister, J.A., Cook, D. 2011. Plants teratogenic to livestock in the United States. In: Riet-Correa, F., Pfister, J., Schild, A.L., Wierenga, T., editors. Poisoning by Plants, Mycotoxins, and Related Toxins. Cambridge, MA. CAB International. 36:236-42.
Effect of MDL-Type alkaloids on tall larkspur toxicosis -
Differences in ponderosa pine isocupressic acid concentrations across space and time -
Cook, D., Gardner, D.R., Pfister, J.A., Panter, K.E., Stegelmeier, B.L., Lee, S.T., Welch, K.D., Green, B.T., Davis, T.Z. 2010. Differences in ponderosa pine isocupressic acid concentrations across space and time. Rangelands. 32(2):14-7.
The comparative pathology of locoweed poisoning in horses and other livestock -
Stegelmeier, B.L., Davis, T.Z., Welch, K.D., Green, B.T., Gardner, D.R., Lee, S.T., Ralphs, M.H., Pfister, J.A., Cook, D., Panter, K.E. 2011. The comparative pathology of locoweed poisoning in horses and other livestock. In: Riet-Correa, F., Pfister, J., Schild, A.L., Wierenga, T., editors. Poisoning by Plants, Mycotoxins, and Related Toxins. Cambridge, MA. CAB International. 48:309-10.
Influence of 7, 8-methylenedioxylycoctonine-type Alkaloids on the Toxic Effects Associated with Ingestion of Tall Larkspurs (Delphinium spp.)in Cattle Reprint Icon -
Welch, K.D., Green, B.T., Gardner, D.R., Cook, D., Pfister, J.A., Stegelmeier, B.L., Panter, K.E., Davis, T.Z. 2010. Influence of 7, 8-methylenedioxylycoctonine-type Alkaloids on the Toxic Effects Associated with Ingestion of Tall Larkspurs (Delphinium spp.)in Cattle. American Journal of Veterinary Research. Vol 71, No 4, pp 487-492.
A Quantitative Method for the Measurement of Three Benzofuran Ketones in Rayless Goldenrod (Isocoma pluriflora) and White Snakeroot (Ageratine altissima) by HPLC -
Lee, S.T., Davis, T.Z., Gardner, D.R., Stegelmeier, B.L., Evans, T.J. 2009. A Quantitative Method for the Measurement of Three Benzofuran Ketones in Rayless Goldenrod (Isocoma pluriflora) and White Snakeroot (Ageratine altissima) by HPLC. Journal of Agricultural and Food Chemistry. 57(12):5639-5642
Selected Common Poisonous Plants of the United States' Rangelands Reprint Icon -
Davis, T.Z., Lee, S.T., Ralphs, M.H., Panter, K.E. 2009. Selected Common Poisonous Plants of the United States' Rangelands. Rangelands. 31(1):38-44 DOI:10.2111/1551-501X-31.1.38
The Effect of Poisonous Range Plants on Abortions in Livestock Reprint Icon -
Welch, K.D., Davis, T.Z., Panter, K.E., Pfister, J.A., Green, B.T. 2009. The Effect of Poisonous Range Plants on Abortions in Livestock. Rangelands, 31(1):28-34. http://www.bioone.org/doi/pdf/10.2111/1551-501X-31.1.45?
Livestock Poisoning with Pyrrolizidine Alkaloid Containing Plants (Senecio, Crotalaria, Cynoglossum, Amsinckia, Heliotropium and Echium spp.) Reprint Icon -
Stegelmeier, B.L., Gardner, D.R., Davis, T.Z. 2009. Livestock Poisoning with Pyrrolizidine Alkaloid Containing Plants (Senecio, Crotalaria, Cynoglossum, Amsinckia, Heliotropium and Echium spp.). Rangelands. 31(1):25-37. http://www.bioone.org/doi/pdf/10.2111/1551-501X-31.1.45?
Lupine Induced "Crooked Calf Disease": The Last 20 Years Reprint Icon -
Lee, S.T., Panter, K.E., Gay, C., Pfister, J.A., Ralphs, M.H., Gardner, D.R., Stegelmeier, B.L., Motteram, E., Cook, D., Welch, K.D., Green, B.T., Davis, T.Z. 2008. Lupine Induced "Crooked Calf Disease": The Last 20 Years. Rangelands. 30(6): 13-8.
The Alkaloid Profiles of Lupinus sulphureus Reprint Icon -
Cook, D., Lee, S.T., Gardner, D.R., Pfister, J.A., Welch, K.D., Green, B.T., Davis, T.Z., Panter, K.E. 2009. The Alkaloid Profiles of Lupinus sulphureus. Journal of Agriculture and Food Chemistry, 57(4):1646-1653.
Serum Elimination Profiles of Methyllycaconitine and Deltaline in Cattle Following Oral Administration of Larkspur (Delphinium barbeyi) Reprint Icon -
Green, B.T., Welch, K.D., Gardner, D.R., Stegelmeier, B.L., Davis, T.Z., Cook, D., Lee, S.T., Pfister, J.A., Panter, K.E. 2009. Serum Elimination Profiles of Methyllycaconitine and Deltaline in Cattle Following Oral Administration of Larkspur (Delphinium barbeyi). American Journal of Veterinary Research, 70(7):926-931.
Last Modified: 8/26/2016
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