NAME: Dr. Ambrose Kipyegon Ng'eno.
CURRENT ASSIGNMENT: Head of Theriogenology, Department of Clinical Studies,Examination officer CSD,
Attachments and special projects coordinator FVM
AREA OF SPECIALIZATION: Theriogenology with inclination towards Andrology
AREAS OF RESEARCH: Effects of environmental pollution on reproduction, Embryo transfer technology, Canine reproduction.
OTHER AREAS OF INTEREST: Diagnostic imaging, One health, Antimicrobial resistance.



Njoroge, EN, Mutembei HM, Kipyegon AN, Kimeli P, Olum2 MO.  2020.  Prevalence of Repeat Breeding Syndrome in Dairy Cattle in Selected Regions of Kenya. International Journal of Veterinary Science. 10(2):144-118.


AN, K, Mutembei HM, Tsuma VT, Oduma JA.  2017.  Effects of exposure to effluent contaminated river water on boar reproduction. Inter J Vet Sci. 6(1):49-52.
HM, M, AN K, ER M.  2017.  Environmental Estrogen-Like Endocrine Disrupting Compounds and the Dangers they pose on Male Fertility: Review Case of Nairobi River Water. Journal of Physical Science and Environmental Studies . 3(3):25-29.


AN, K, Mutembei HM, Tsuma VT, Oduma JA.  2016.  Levels Of 17β Steroid and Alkylphenol Estrogenic Endocrine Disrupting compounds in Nairobi River. Journal of Physical Science and Environmental Studies. 2(3):46-49.
AN, K, Mutembei HM, Tsuma VT, Oduma JA.  2016.  Effects of Effluent Contaminated River Water on Testicular Histology of Mice. . Sch J Agric Vet Sci. 3(6):411-415.


P, K, SW M, RM C, G K, TO A, WE M, AN K, JD M.  2015.  A retrospective study on findings of canine hip dysplasia screening in Kenya. Veterinary World . 8(11):1326-1330.
HM, M, Cook AE, J M, DN M, J A, AN K, CM M.  2015.  A One-Health Approach to Control the Incidence of Rabies in the Slums of Nairobi. Journal of Medical and Biological Science Research . 1(9):130-133.
P, K, S A, AN K, S.W M.  2015.  Acute abdominal aortic rupture in a mare on transit. international journal of agricultural science and veterinary medicine . 3(2):20-22.


P, K, AN K, WE M, EGM M, Karanja DN.  2014.  Diffuse peritonitis associated with ventral hernia in an adult doe: Case report. Journal of agriculture and veterinary sciences. 7(1):53-55.
P, K, AN K, WE M, JD M.  2014.  A case of Trypanosoma congolense savannah type infection and its management in a dog.. J. Adv. Vet. Anim. Res., . 1(4):232-234.
P, K, AN K, DN K.  2014.  Fatal obstructive urolithiasis in a 5 month old buck: a case report.. Inter J Vet Sci, . 3(1):40-42.



Kipyegon, AN, Mutembei HM, Tsuma VT, Oduma JA.  2012.  Effects of ripe papaya (Carica papaya) seed powder on the seminiferous epithelium of the boar testis. Abstract

The effect of oral administration of ripe Carica Papaya seed powder on testicular histology of Sus scrofa domestica boars has been addressed in the present article. Fifteen pubertal Large White boars were randomly selected and divided into two groups. Each boar in the experimental group received a daily dose of 300mg C Papaya mixed with 0.5 kg of conventional pig feed while the control group received a placebo. The experiment was carried out for 56 days in the University of Nairobi. After every two weeks, one boar from the control group and two from the experimental group were castrated and testicular tissue samples processed for histology. At the end of 56 days the remaining entire boars were maintained for 14 days and 60 days respectively without the papaya powder to assess reversibility. The test material had no effect on haematological parameters. However, histopathological changes of the seminiferous epithelium which appeared to be dependent upon duration of C Papaya consumption was noticed, these changes were reversible. Although the mechanism(s) for the effect of papaya seed extract is not explained by this study, it is observed that papaya seed powder causes gradual disorganization, exfoliation and loss of spermatocytes and spermatids.


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