Dr. Patrick Hatfield

Dr. Hatfield

Linfield Hall, MSU-Bozeman
Bozeman, MT 59717
phone (406) 994-7952
fax (406) 994-5589
hatfield@montana.edu

Education
B.S. Montana State University, Range Science 1983
M.S. New Mexico State University, Range Science 1985
PhD University of Nebraska-Lincoln, Ruminant Nutrition 1988

Classes
ARNR 100 introduction to Animal Science (team instructor)
ARNR 230 Range Livestock Production (team instructor)
ARNR 232 Applied Techniques in Livestock Management - Sheep
ARNR 432 Sheep Management
ARNR 521 Ruminant Nutrition

Research Interests

• Nutritional and management factors that improve sheep production efficiency
• Incorporating sheep into crop production systems

Accomplishments and Interests

• Investigate alternatives to traditional crop residue and fallow management using sheep to control weed and insect pests and enhance soil nutrient cycling.
• Develop strategic nutritional intervention strategies for the late gestating ewe to minimize neonatal losses by improving lamb immune function and/or fetal and neonate energetic status.
• Determine profitable management options that enhance quality and expand the availability of market ready lean lamb beyond current seasonal limits.
• Develop and maintain online programs to aid students and producers in making sound nutrition and management decisions.

Recent Publications

• Hatfield, P. G., S. L. Blodgett, T. M. Spezzano, H. B. Goosey, A. W. Lenssen, R. W. Kott, and C. B. Marlow. 2007. Incorporating sheep into dryland grain production systems: I. Impact on over-wintering larva populations of wheat stem sawfly, Cephus cintus Norton, (Hymenoptera: Cephidae). Small Rum. Res. 67:209-215.
• Hatfield, P. G., A. W. Lenssen, T. M. Spezzano, S. L. Blodgett, H. B. Goosey, R. W. Kott, and C. B. Marlow. 2007. Incorporating sheep into dryland grain production systems: II. Impact on changes in biomass and weed frequency. Small Rum. Res. 67:216-221.
• Hatfield, P. G., H. B. Goosey, T. M. Spezzano, S. L. Blodgett, A. W. Lenssen, R. W. Kott, and C. B. Marlow. 2007. Incorporating sheep into dryland grain production systems: III Impact on changes in soil bulk density and soil nutrient profiles. Small Rum. Res. 67:222-231.
• Hatfield, P. G., H. Goosey, A. Lenssen, and S. Blodgett. 2006. Incorporating target grazing into farming systems. IN: Targeted grazing: A natural approach to vegetation management and landscape enhancement. pp 129-140. American Sheep Industry Association.
• Surber, L., Roeder, B., P.G. Hatfield, and R.W. Kott. 2006. Feedlot performance and carcass characteristics of spring-born wethers finished on an 80% barley diet either in the fall or spring and slaughtered at seven to eight, or fourteen to fifteen months of age, respectively. Small Rum. Res. 66:102-107.
• Boles, J.A., R.W. Kott, P.G. Hatfield, J.W. Berman, and C.R. Flynn. 2005. Supplemental safflower oil affects the fatty acid profile, including conjugated linoleic acid, of lamb. J. Anim. Sci. 83: 2175-2181.
• Goosey, H.B., P.G. Hatfield, A.W. Lenssen, S.L. Blodgett and R.W. Kott. 2005. The potential role of sheep in dryland grain production systems. Agric. Ecosystems Environ. 111: 349-353.
• Goosey, H. B., P. G. Hatfield, S. L. Blodgett, and S. D. Cash. 2004. Evaluation of Alfalfa Weevil (Coleoptera: Curculionidae) Densities and Regrowth Characteristics of Alfalfa Grazed by Sheep in Winter and Spring. J. Entomol. Sci. 39:598-610.
• Kott, R.W., Hatfield, P.G., Bergman, J.W., Flynn, C.R., VanWagoner, H., Boles, J.A. 2003. Feedlot performance, carcass composition, and muscle and fat CLA concentration of lambs fed diets supplemented with safflower seeds. Small Ruminant Research 49:11-17.
• Hatfield, P. G., B. L. Robinson, D. Minikheim, R. W. Kott, N. I. Roth, J. T. Daniels, and C. K. Swenson. 2002. Serum α-tocopherol and immune function in yearling ewes supplemented with zinc and vitamin E. J. Anim. Sci. 80:1329.
• Taylor N., P. G. Hatfield, B. F. Sowell, and G. S. Lewis. 2002. Influence of supplement form on ewe performance and reproduction. Sheep and Goat Res. J. 17:52.
• Taylor, N., P. G. Hatfield, B. F. Sowell, J.G.P. Bowman, J. S. Drouillard, and D. V. Dhuyvetter. 2002. Pellet and block supplements for grazing ewes. Anim. Feed Sci. Technol. 96:193-201.
• Taylor, N., P.G. Hatfield, B.F. Sowell and G.S. Lewis. 2002. Research Note: Influence of supplement form on ewe performance and reproduction. Sheep and Goat Res. J. 17:52-54.
• Griffith, D., P.G. Hatfield, and R.W. Kott. 2001. Enterprise budgeting for ewe flock operations. Sheep and Goat Res. J. 17:29.
• Hatfield, P.G., C. K. Swenson, R.W. Kott, R.P. Ansotegui, N.I. Roth, and B.L. Robinson. 2001. Zinc and copper status in ewes supplemented with sulfate and amino acid complexed forms of zinc and copper. J. Anim. Sci. 79:261
• Hatfield, P.G., J. T. Daniels, R.W. Kott, and D. E. Burgess. 2001. Survival and serum IgG levels in twin born lambs supplemented with vitamin E early in life. Sheep and Goat Res. J. 17:24.
• Stellflug, J. N., P.G. Hatfield, M. C. Wulster-Radcliffe, and J. Walker. 2001. Reproductive performance of ewe lambs from ewes from different selection practices with or without induced estrus. Anim. Repro. Sci. 66:185.
• Shanks, B. C., P.G. Hatfield, R. A. Field, and J. A. Hopkins. 2000. Influence of winter backgrounding systems on subsequent lamb finishing performance, body composition, carcass traits, and palatability. Sheep and Goat Res. J. 16:88.
• Daniels, J.T., D.E. Burgess, P.G. Hatfield, and R.W. Kott. 2000. An ELISA method for determining sheep serum IgG concentration. Sheep and Goat Res. J. 16:33-34.
• Daniels, J.T., P.G. Hatfield, D. E. Burgess, R.W. Kott, and J.G.P. Bowman. 2000. Evaluation of ewe and lamb immune response when ewes were supplemented with vitamin E. J. Anim. Sci. 78:2731-2736.
• Hamadeh, S.K., P.G. Hatfield, B. L. Robinson, N. J. Roth, and R. W. Kott. 2000. Alpha acid glycoprotein (AGP) as an early indicator of stress in new-born lambs. Sheep and Goat Res. J. 16:72-73.
• Hamadeh, S. K., P.G. Hatfield, R.W. Kott, B.F. Sowell, B.L. Robinson, and N.J. Roth. 2000. Effects of Breed, Sex, Birth Type and Colostrum Intake on Cold Tolerance in Newborn Lambs. Sheep and Goat Research Journal. 16:46-51.
• Hatfield, P.G., J.T. Daniels, R.W. Kott, D.E. Burgess, and T.J. Evans. 2000. Role of supplemental vitamin E in lamb survival and production: A Review. Proc. Am. Soc. Anim. Sci. at: http://www.asas.org/jas/symposia/proceedings/0932.pdf .
• Hatfield, P.G., R.A. Field, J.A. Hopkins, and R.W. Kott. 2000. Palatability of wethers fed an 80% barley diet processed at different ages and of yearling wethers grazed on native range. J. Anim. Sci. 78:1779-1785
• Hatfield, P.G., W.S. Ramsey, and J.A. Fitzgerald. 2000. Effect of naloxone on intake, growth hormone, and luteinizing hormone concentrations in lactating and non-lactating ewes. Small Rum. Res.35:21-25.
• Roeder, R.L., V.M. Thomas, R.W. Kott, P.G. Hatfield, and D. Burgess. 2000. Effect of short term prepartum feeding of levels and type of protein on ewe performance and colostrum accumulation. Sheep and Goat Res. J. 16:1-6.
• Hatfield, P.G., S.L. Blodgett, G.D. Johnson, P.M. Denke, R.W. Kott, and M.W. Carroll. 1999. Sheep Grazing to Control Wheat Stem Sawfly, a Preliminary Study. Sheep and Goat Res. J.15:159-16.

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