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* Lemma, A., Bekana, M., Schwartz, H.J., and Hildebrant, T. (2006). ‘Ultrasonographic study of ovarian activities in the tropical jenny during the seasons of high and low sexual activity’. ''Journal of Equine Veterinary Science ''26. pp 18-22.
 
* Lemma, A., Bekana, M., Schwartz, H.J., and Hildebrant, T. (2006). ‘Ultrasonographic study of ovarian activities in the tropical jenny during the seasons of high and low sexual activity’. ''Journal of Equine Veterinary Science ''26. pp 18-22.
 
* Lemma, A., Bekana, M. , Schwartz, H.J., and Hildebrant, T. (2006) ‘The effect of body condition on ovarian activity of free ranging tropical jennies (''Equus asinus'')’. ''Journal of Veterinary Medicine Series A- Physiology and Pathology Clinical Medicine'' 53. pp 1-4.
 
* Lemma, A., Bekana, M. , Schwartz, H.J., and Hildebrant, T. (2006) ‘The effect of body condition on ovarian activity of free ranging tropical jennies (''Equus asinus'')’. ''Journal of Veterinary Medicine Series A- Physiology and Pathology Clinical Medicine'' 53. pp 1-4.
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* Lun, S., He, C., Zhang, Y., Chen, Z., Hu, W., Lu, S., Jia, W., and Zhang, Q. (1998). ‘Preliminary study on development of follicles and formation of corpus luteum of the jenny and mare by ultrasonography’. ''Acta Veterinaria et Zootechnica Sinica'' 29. pp 419-425.
 
* Meira, C.,Ferreira, J.C.P., Papa, F.O., and Henry, M. (1995). ‘Study of the estrous cycle in donkeys (''Equus asinus'') using ultrasonography and plasma progesterone concentrations’. ''Biol Reprod Monograph'' 1. pp 403-410.
 
* Meira, C.,Ferreira, J.C.P., Papa, F.O., and Henry, M. (1995). ‘Study of the estrous cycle in donkeys (''Equus asinus'') using ultrasonography and plasma progesterone concentrations’. ''Biol Reprod Monograph'' 1. pp 403-410.
 
* Tibary, A., Bakkoury, M.(eds). (1994). ‘Particularités de la reproduction chez les autres espèces équines’. ''Reproduction équine, Tome I: La jument.'' Actes Editions 1994. pp 385-400.
 
* Tibary, A., Bakkoury, M.(eds). (1994). ‘Particularités de la reproduction chez les autres espèces équines’. ''Reproduction équine, Tome I: La jument.'' Actes Editions 1994. pp 385-400.
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