Nutrition of dairy cattle, dairy goats, sheep, rabbits; forage nutritive values; mineral metabolism; factors affecting milk composition, including mastitis and genetic polymorphisms; nutritional factors affecting reproduction; electronic monitoring of nutrition and mastitis; milk somatic cell counts; milk and cheese quality factors.

Publications:

• Haenlein, G. F. W. 1991. Goat milk in human nutrition. Intern. J. Animal Sci. (India) 6:13. Bretzlaff, K., G. F. W. Haenlein and E. Huston. 1991. The goat industry: Feeding for optimal production; Common nutritional problems, feeding the sick goat. In: Large Animal Nutrition, J. M. Naylor and S. L. Ralston, ed., Mosby Book Publ., St. Louis, 339-355.

• Haenlein, G. F. W. 1992. Recent advances in goat requirements of macroelements. Proceedings Vth Intern. Conference on Goats, R. M. Acharya, ed., New Delhi, India, 195-201.
  
  
• Haenlein, G. F. W. 1993. Growing food at home - goats. In: Handbook for Teaching Families. A Training Manual. N. B. Leidenfrost, ed., USDA Extension Service, Washington D.C., Publ. CD Resources, Inc., p. 272-284.
  
  
• Haenlein, G. F. W. and Hinckley, L. S. 1994. Goat milk somatic cell count situation in USA. Proceedings Intern. Dairy Fed. Conference, R. Rubino, ed., Bella, Italy, 4:27-37; In: Somatic Cells and Milk of Small Ruminants, R. Rubino, ea., Wageningen Pers, EAAP Publ. No. 77, 349-355 (1996).
  
  
• Haenlein, G. F. W. 1995. Nutritional value of dairy products of ewes and goats milk. Proceedings, 2nd IDF Seminar, Production and Utilization of Ewes and Goats Milk, Limin Hersonissos, Crete, Greece, Oct. 19-21.
  
  
• Rubino, R. and Haenlein, G. F. W. 1996. Goat milk production systems: subsystems and differentiation factors. Proceedings VI International Conference on Goats, Beijing, China, International Academic Publ., Beijing, 1:9-15.
  
  
• Haenlein, G. F. W. 1996. Status and prospects of the dairy goat industry in the U.S. J. Animal Sci. 74:1173-1181.
  
  
• Haenlein, G. F. W. 1996. Production and utilization of ewe and goat milk.  Proceedings, IDF Greek Nat. Comm., CIRVAL Seminar, Production and Utilization of Ewe and Goat Milk, Crete, Greece, Oct. 19-21, 1995, Internat. Dairy Fed., Brussels, Belgium, Bul. 9603, 159-178.
  
  
• Haenlein, G.F.W., 1997. Alternatives in dairy goat product market. Internat. J. Animal Sc. (India) 12:149-153.
  
  
• Galina, M.A., D.C. Puga, A. Hernandez and G.F.W. Haenlein, 1997. Biodiverse and biosustainable production system with goats in Mexico. Importance of a forage bank. Small Rumin. Res. 27:19-23.
  
  
• Haenlein, G.F.W. 1998. The value of goats and sheep to sustain mountain farmers. Internat. J. Animal Sci. (India) 13:187-194.
  
  
• Galina, M.A., Morales, A.R., Jimenez, S. and Haenlein, G.F.W.1998. Performance of dairy goats pasturing shrubland in Mexico supplemented with a urea molasses mineral block. Adv. in Agr. Res. 7 (3):15-21.
  
  
• Haenlein, G.F.W. and Fahmy, M.H. (ed.) 1999. Role of small ruminants in the supply of animal products. Proceedings Symposium Session S11, 8th World Conference on Animal Production, Seoul, South Korea, June 28-July 4, 1998; Small Rumin. Res. 34:175-308.
  
  
• Haenlein, G.F.W. 1999. Relationship of somatic cell counts in goat milk to mastitis and productivity.  Proceedings 1st International Conference on Sheep and Goat Diseases and Productivity, Oct. 23-25,1999, Jordan Univ. Sci. & Technol., Irbid, Jordan, 124; Internat.  J. Animal Sci. (India), 16:37-51.
  
  
• Haenlein, G. F. W. 2000. Specificity and quality of goat products.  The concept of milk quality in the USA.  Proceedings, 7th International Conference on Goats, May 15-21, 2000, Tours, France,  867-868; Internat. J. Animal Sci. (India), 16:5-8.
  
  
• Ramirez, R.G., Haenlein, G.F.W. and Nunez-Gonzalez, M.A. 2001. Seasonal variation of macro and trace mineral contents in 14 browse species that grow in northeastern Mexico. Small Rumin. Res., 39:153-160.
  
  
• Haenlein, G. F. W. 2001. Past, present and future perspectives of small ruminant research.  Proceedings, 100th Ann. Mtg. American Dairy Sci. Assn., Baltimore,  July 23-26, 2000; J. Dairy Sci. 84:2097-2115.