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Dr. E. (Ermias) KEBREAB
PhD (University of Reading, UK)
Associate P
Canada Research Chair II
Department of Animal Science

On Leave December 1, 2009 to
November 30, 2010

UC Davis
211 Meyer Hall
One Shields Avenue, Davis, CA 95616

Telephone: (530) 752-5907
Facsimile:  (530) 752-0175

Research Interests

  • Modelling sustainable agricultural production
  • Energy and nutrient requirements of cattle, swine and poultry
  • Empirical, mechanistic and simulation models of nutrient utilization
  • Modelling nutrient dynamics in manure
  • Modelling greenhouse gas emissions (animal, manure and soil)

Recent Publications


Vitti, DMSS, and E. Kebreab. 2009. Phosphorus and Calcium Utilization and Requirements in Farm Animals. CAB International, Wallingford, UK, in press

France, J., and E. Kebreab. 2008. Mathematical Modelling in Animal Nutrition. CAB International, Wallingford, UK, 547pp.

Kebreab, E., J. Dijkstra, W. J. J. Gerrits, A. Bannink, and J. France. 2006. Nutrient Utilization in Farm Animals: Modelling Approach. CAB International, Wallingford, UK, 446pp.

Kebreab, E., J.A.N. Mills, and D.E. Beever. 2004. Dairying - Using Science to Meet Consumers' Needs. Nottingham University Press, UK, 218pp.

Refereed Papers (2008-2009):

1. Kebreab, E., J. Dijkstra, A. Bannink, and J. France. 2009. Advances in modeling ruminant nutrient utilization. J. Anim. Sci. in press. (Invited paper).

2. Darmani Kuhi, H., T. Porter, E. Kebreab, S. Lopez and J. France. 2009. A comparative evaluation of functions for the analysis of growth in turkeys. World’s Poult. Sci. J. in press.

3. Ellis, J. L., J. J. Thomason, E. Kebreab, K. Zubair and J. France. 2009. Cranial dimensions and forces of biting in the domestic dog. J. Anatomy in press.

4. Kebreab E., J. France, R. P. Kwakkel, S. Leeson, H. Darmani Kuhi and J. Dijkstra. 2009. Development and evaluation of a dynamic model of calcium and phosphorus flows in layers. Poult. Sci., in press.

5. Dyck, M. G. and E. Kebreab. 2009. Estimating the energetic contribution of polar bear (Ursus maritimus) summer diets to the total energy budget. J. Mammal., in press.

6. Ellis, J. L., E. Kebreab, N.E. Odongo, K. Beauchemin, S. McGinn, J. D. Nkrumah, S. S. Moore, R. Christopherson, G. K. Murdoch, B. W. McBride, E. K. Okine, and J. France. 2009. Modeling methane production from beef cattle using linear and non-linear approaches. J. Anim. Sci., in press.

7. Zhang, Z., E. Kebreab, R. Kuehn, J. C. Rodriguez-Lecompte, and J. D. House. 2009. Impairments in pyridoxine-dependent sulphur amino acid metabolism are highly sensitive to the degree of vitamin B6 deficiency and repletion in the pig. Animal, in press.

8. Darmani Kuhi, H., E. Kebreab, S. Lopez and J. France. 2009. Application of the law of diminishing returns to estimate maintenance requirement for amino acids and their efficiency of utilisation for accretion in young chicks. J. Agric. Sci., in press.

9. Dias, R. S., T. Silva, R. M. P. Pardo, J. C. Silva Filho, D. M. S. S. Vitti,
E. Kebreab and J. France. 2009. Rumen phosphorus metabolism in sheep. J Agric. Sci. in press.

10. Fathi Nasri, M. H., J. France, N. E. Odongo, S. Lopez, A. Bannink and
E. Kebreab. Modelling the lactation curve of dairy cows using the differentials of growth functions. J. Agric. Sci., 633-641.

11. Kebreab, E., K. A. Johnson, S. L. Archibeque, D. Pape, and T. Wirth. 2008. Model for estimating enteric methane emissions from US cattle. J. Anim. Sci. 86:2738-2748.

12. Jalilvand, G., N.E. Odongo, A. Naserian, R. Valizadeh, F. Eftekhar Shahroodi, E. Kebreab, and J. France. 2008. Effects of different levels of an enzyme mixture on in vitro gas production parameters of different forages. Anim. Feed Sci. Technol., 146:289-301.

13. Behera, U. K., C. M. Yates, E. Kebreab and J. France. 2008. Farming systems methodology for efficient resource management at the farm level: a review from an Indian perspective J. Agric. Sci., 146:493-505.

14. Dijkstra, J., E. Kebreab, A. Bannink, L. A. Crompton, S. López, P. A. Abrahamse, P. Chilibroste, J. A. N. Mills, and J. France. 2008. Comparison of energy evaluation systems and a mechanistic model for milk production by dairy cattle offered fresh grass-based diets. Anim. Feed Sci. Technol. 143:203-219.

15. Jalilvand, G., A. Naserian, E. Kebreab, N.E. Odongo, R. Valizadeh, F. Eftekhar Shahroodi, S. Lopez, and J. France. 2008. Rumen degradation degradation kinetics of alfalfa hay, maize silage and wheat straw treated with fibrolytic enzymes. Archivos de Zootecnia, 57:155-164.

16. Ellis, J. L., J. J. Thomason, E. Kebreab and J. France. 2008. Calibration of estimated biting forces in domestic canids: Comparison of post-mortem and in vivo measurements. J. Anatomy, 212:769-780.

17. Schulin-Zeuthen, M., E. Kebreab, J. Dijkstra S. Lopez, A. Bannink, and J. France. 2008. A comparison of the Schumacher with other functions for describing growth in pigs. Anim. Feed Sci. Technol. 143:314-327.

18. Bannink, A, J. France, S. Lopez, W. J. J. Gerrits, E. Kebreab, and J. Dijkstra. 2008. Modelling the implications of feeding strategy on rumen fermentation and functioning of the rumen wall. Anim. Feed Sci. Technol. 143:3–26.

19. France, J., E. Kebreab, and J.A. Metcalf. 2008. Proceedings of the 2008 meeting of the animal science modelling group. Can. J. Anim. Sci. 88:725-737.

20. Dias, R. S., E. Kebreab, D. M. S. S. Vitti, A. P. Roque, and J. France. 2008. Application and comparison of two models to study the effects of calcium sources in sheep. Anim. Feed Sci. Technol., 143:89–103.

21. Hill, S. R., K. F. Knowlton, E. Kebreab, J. France, and M. D. Hanigan 2008. A model of phosphorus digestion and metabolism in the lactating dairy cow. J Dairy Sci. 91:2021–2032.

22. Ellis, J. L., J. Dijkstra, E. Kebreab, A. Bannink, N. E. Odongo, B.W. McBride, J. France. 2008. Aspects of rumen microbiology central to mechanistic modelling of methane production in cattle. J. Agric. Sci. 146:213-233.

23. Kebreab E., J. France, H. Darmani Kuhi and S. Lopez. 2008. A comparative evaluation of functions for partitioning nitrogen and amino acid intake between maintenance and growth in broilers. J. Agric. Sci. 146:163-170.

24. Fathi Nasri, M. H., J. France, M. Danesh Mesgaran, and E. Kebreab. 2008. Effect of heat processing on ruminal degradability and intestinal digestibility of nitrogen and amino acids in Iranian whole soybeans. Livest. Sci. 113:43-51.

25. Kebreab, E., N. E. Odongo, B. W. McBride, M. D. Hanigan and J. France. 2008. Phosphorus utilization and environmental and economic implications of reducing phosphorus pollution from Ontario dairy cows. J. Dairy Sci. 91:241-246.

26. AlZahal, O., E. Kebreab, J. France, M. Froetschel and B. W. McBride. 2008. Ruminal temperature may aid in the detection of subacute ruminal acidosis. J. Dairy Sci. 91:202-207.

Click here for a full CV and list of publications.

Positions Available:

PhD – Mathematical modelling of monogastric nutrition

Post-doctoral Fellows:

Dr. Qiang Huang

Dr. Haben Asghedom

Graduate Students

Aklilu Alemu, Ph.D. Candidate

Jennifer Ellis, Ph.D. Candidate

Abiel Roche Lima, Ph.D. Candidate

Neijat Mohammed, M.Sc. Candidate

Tarina Porter, M.Sc. Candidate

Alexander Yitbarek, M.Sc. Candidate

Visiting fellow

Anders Strathe, U. of Copenhagen, Denmark


ANSC 7140 - Animal Science Seminar

AGRI 3030 - Modern Topics in Agriculture: Mathematical Modeling of Agricultural Systems




  Department of Animal Science
Faculty of Agricultural & Food Sciences
University of Manitoba - Winnipeg, MB, Canada - R3T 2N2
Tel: (204) 474-9383  Fax: (204) 474-7628
Questions or comments? email Animal Science