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Allen Roussel

Department Head of Large Animal Clinical Services & Professor of Large Animal Internal Medicine


Phone: (979) 845-9127

Office: VLAH 208

Mailstop: 4475

Department: VLCS

Photo of Roussel, Allen


    • Serving on a PhD jury in France
    • Serving on the Examination Committee of the European College of Bovine Health Management held in Germany.
    • Previously I spent 2 sabbaticals in France and helped with a study abroad course in Germany.


  • M.S. Veterinary Clinical Sciences, Purdue University 1984
  • D.V.M. Veterinary Medicine, Louisiana State University 1977


  • De Facto Diplomate, European College of Bovine Health Management
  • Diplomate, American College of Veterinary Internal Medicine
  • Texas Veterinary Medical License: 4218

Scholarly Interests

Food animal medicine, Johne's disease, internal medicine and meat goats. Paratuberculosis, clinical laboratory diagnostic testing and interpretation, gastrointestinal motility of domestic animals, fluid and electrolyte balance in large animals.


Benefits of obtaining test-negative Level 4 classification for beef producers in the Voluntary Bovine Johne's Disease Control Program.
Benjamin LA, Fosgate GT, Ward MP, Roussel AJ, Feagin RA, Schwartz AL
Prev Vet Med. 2009 Oct; 91(2-4):280-4.
Preliminary investigation of a humoral and cell-mediated immunity ratio for diagnosis of paratuberculosis in beef cattle.
Fosgate GT, Osterstock JB, Benjamin LA, Dobek GL, Roussel AJ
Prev Vet Med. 2009 Oct; 91(2-4):226-33.
Use of Walpole's solution for treatment of goats with urolithiasis: 25 cases (2001-2006).
Janke JJ, Osterstock JB, Washburn KE, Bissett WT, Roussel AJ, Hooper RN
J Am Vet Med Assoc. 2009 Jan; 234(2):249-52.
Comparison of three methods of surveillance with application to the detection of Johne's disease seropositivity in Texas cattle.
Pearce BH, Fosgate GT, Ward MP, Roussel AJ, Norby B, Tavornpanich S, Ellis D
Prev Vet Med. 2008 Aug; 86(1-2):1-7.
Assessing familial aggregation of paratuberculosis in beef cattle of unknown pedigree.
Osterstock JB, Fosgate GT, Derr JN, Cohen ND, Roussel AJ
Prev Vet Med. 2008 Apr; 84(1-2):121-34.
Familial associations with paratuberculosis ELISA results in Texas Longhorn cattle.
Osterstock JB, Fosgate GT, Cohen ND, Derr JN, Manning EJ, Collins MT, Roussel AJ
Vet Microbiol. 2008 May; 129(1-2):131-8.
Evaluation of the ruminant serum chemistry profile.
Russell KE, Roussel AJ
Vet Clin North Am Food Anim Pract. 2007 Nov; 23(3):403-26, v.
Environmental mycobacteria in soil and water on beef ranches: association between presence of cultivable mycobacteria and soil and water physicochemical characteristics.
Norby B, Fosgate GT, Manning EJ, Collins MT, Roussel AJ
Vet Microbiol. 2007 Sep; 124(1-2):153-9.
Contribution of environmental mycobacteria to false-positive serum ELISA results for paratuberculosis.
Osterstock JB, Fosgate GT, Norby B, Manning EJ, Collins MT, Roussel AJ
J Am Vet Med Assoc. 2007 Mar; 230(6):896-901.
Association of fecal shedding of mycobacteria with high ELISA-determined seroprevalence for paratuberculosis in beef herds.
Roussel AJ, Fosgate GT, Manning EJ, Collins MT
J Am Vet Med Assoc. 2007 Mar; 230(6):890-5.
Are feeding practices associated with duodenitis-proximal jejunitis?
Cohen ND, Toby E, Roussel AJ, Murphey EL, Wang N
Equine Vet J. 2006 Nov; 38(6):526-31.
Pharmacokinetics and clinical effects of a subanesthetic continuous rate infusion of ketamine in awake horses.
Fielding CL, Brumbaugh GW, Matthews NS, Peck KE, Roussel AJ
Am J Vet Res. 2006 Sep; 67(9):1484-90.
Protothecal enteritis as a cause of protein-losing enteropathy in a bull.
Osterstock JB, Mansell JL, Roussel AJ Jr
J Am Vet Med Assoc. 2005 Nov; 227(9):1476-9, 1418.
Effects of seasonal climatic conditions on the diagnosis of Mycobacterium avium subspecies paratuberculosis in dairy cattle.
Strickland SJ, Scott HM, Libal MC, Roussel AJ Jr, Jordan ER
J Dairy Sci. 2005 Jul; 88(7):2432-40.
Effect of an indwelling nasogastric tube on gastric emptying rates of liquids in horses.
Lammers TW, Roussel AJ, Boothe DM, Cohen ND
Am J Vet Res. 2005 Apr; 66(4):642-5.
Prevalence of and risk factors for paratuberculosis in purebred beef cattle.
Roussel AJ, Libal MC, Whitlock RL, Hairgrove TB, Barling KS, Thompson JA
J Am Vet Med Assoc. 2005 Mar; 226(5):773-8.
Evaluation of risk factors associated with development of postoperative ileus in horses.
Cohen ND, Lester GD, Sanchez LC, Merritt AM, Roussel AJ Jr
J Am Vet Med Assoc. 2004 Oct; 225(7):1070-8.
Evaluation of urine sucrose concentration for detection of gastric ulcers in horses.
O'Conner MS, Steiner JM, Roussel AJ, Williams DA, Meddings JB, Pipers F, Cohen ND
Am J Vet Res. 2004 Jan; 65(1):31-9.
Evaluation of the effects of penicillin G potassium and potassium chloride on the motility of the large intestine in horses.
Roussel AJ, Hooper RN, Cohen ND, Bye AD, Hicks RJ, Schulze JL
Am J Vet Res. 2003 Nov; 64(11):1360-3.
Evaluation of acetaminophen absorption in horses with experimentally induced delayed gastric emptying.
Lohmann KL, Bahr A, Cohen ND, Boothe DM, Roussel AJ
Am J Vet Res. 2002 Feb; 63(2):170-4.
Bacterial microflora of normal and telangiectatic livers in cattle.
Stotland EI, Edwards JF, Roussel AJ, Simpson RB
J Am Vet Med Assoc. 2001 Jul; 219(1):36-9.
Effect of monensin sodium on histological lesions of naturally occurring bovine paratuberculosis.
Brumbaugh GW, Edwards JF, Roussel AJ Jr, Thomson TD
J Comp Pathol. 2000 Jul; 123(1):22-8.
Prokinetic effects of erythromycin on the ileum, cecum, and pelvic flexure of horses during the postoperative period.
Roussel AJ, Hooper RN, Cohen ND, Bye AD, Hicks RJ, Bohl TW
Am J Vet Res. 2000 Apr; 61(4):420-4.
Comparison of nuclear scintigraphy and acetaminophen absorption as a means of studying gastric emptying in horses.
Lohmann KL, Roussel AJ, Cohen ND, Boothe DM, Rakestraw PC, Walker MA
Am J Vet Res. 2000 Mar; 61(3):310-5.
Clinical and pathologic features of cloned transgenic calves and fetuses (13 case studies).
Hill JR, Roussel AJ, Cibelli JB, Edwards JF, Hooper NL, Miller MW, Thompson JA, Looney CR, Westhusin ME, Robl JM, Stice SL
Theriogenology. 1999 Jun; 51(8):1451-65.
Alterations in acid-base balance and serum electrolyte concentrations in cattle: 632 cases (1984-1994).
Roussel AJ, Cohen ND, Holland PS, Taliaoferro L, Green R, Benson P, Navarre CB, Hooper RN
J Am Vet Med Assoc. 1998 Jun; 212(11):1769-75.
Tension band plating of an olecranon fracture in a bull.
Hague BA, Watkins JP, Hooper RN, Taylor TS, Roussel AJ
J Am Vet Med Assoc. 1997 Sep; 211(6):757-8.
Immunization with Babesia bigemina rhoptry-associated protein 1 induces a type 1 cytokine response.
Ruef BJ, Tuo W, Rodriguez SD, Roussel AJ, Chitko-McKown CG, Palmer GH, McElwain TF, Canals A, Zarlenga DS, Gasbarre LC, Brown WC
J Interferon Cytokine Res. 1997 Jan; 17(1):45-54.
High-sodium crystalloid solution for treatment of hypernatremia in a Vietnamese pot-bellied pig.
Banks P, Roussel AJ Jr, Mealey RH
J Am Vet Med Assoc. 1996 Oct; 209(7):1268-70.
Catheterization of the auricular vein in cattle: 68 cases (1991-1994).
Roussel AJ Jr, Talioferra L, Navarre CB, Hooper RN
J Am Vet Med Assoc. 1996 Mar; 208(6):905-7.
Indwelling cecal catheters for fluid administration in ponies.
Mealey RH, Carter GK, Roussel AJ, Ruoff WW
J Vet Intern Med. 1995 Sep; 9(5):347-52.
Abomasal and duodenal motility in yearling cattle after administration of prokinetic drugs.
Roussel AJ, Brumbaugh GW, Waldron RC, Baird AN
Am J Vet Res. 1994 Jan; 55(1):111-5.
Urinary indices of horses after intravenous administration of crystalloid solutions.
Roussel AJ, Cohen ND, Ruoff WW, Brumbaugh GW, Schmitz DG, Kuesis BS
J Vet Intern Med. 1993 Jul; 7(4):241-6.
Alterations of fluid and electrolyte balance in thoroughbred racehorses following strenuous exercise during training.
Cohen ND, Roussel AJ, Lumsden JH, Cohen AC, Grift E, Lewis C
Can J Vet Res. 1993 Jan; 57(1):9-13.
Myoelectric activity of the small intestine in enterotoxin-induced diarrhea of calves.
Roussel AJ, Woode GN, Waldron RC, Sriranganathan N, Jones MK
Am J Vet Res. 1992 Jul; 53(7):1145-8.
Prophylactic effect of monensin sodium against experimentally induced paratuberculosis in mice.
Brumbaugh GW, Frelier PF, Roussel AJ Jr, Thomson TD
Am J Vet Res. 1992 Apr; 53(4):544-6.
Type-I diabetes mellitus in a bull.
Kitchen DL, Roussel AJ Jr
J Am Vet Med Assoc. 1990 Sep; 197(6):761-3.
Effect of flunixin meglumine on Escherichia coli heat-stable enterotoxin-induced diarrhea in calves.
Roussel AJ Jr, Sriranganathan N, Brown SA, Sweatt D
Am J Vet Res. 1988 Aug; 49(8):1431-3.
Comparison of calf weaning weight and associated economic variables between beef cows with and without serum antibodies against or isolation from feces of Mycobacterium avium subsp paratuberculosis
Bhattarai B*, GT Fosgate, JB Osterstock, CP Fossler, SC Park, and AJ Roussel
J Am Vet Med Assoc.
Culling decisions based on microbiological and serological test results for Johne’s Disease in commercial beef cow-calf herds are not economically justifiable
Roussel, AJ
Twelfth International Colloquium on Paratuberculosis, Parma, Italy.
Perceptions of veterinarians in bovine practice and producers with beef cow-calf operations enrolled in the US Voluntary Bovine Johne’s Disease Control Program concerning economic losses associated with Johne’s disease
Bhattarai B*, GT Fosgate, JB Osterstock, CP Fossler, SC Park, and AJ Roussel
Prev Vet Med.

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