dc.contributor.author | Kayanja, B I F | |
dc.date.accessioned | 2013-09-30T08:24:50Z | |
dc.date.available | 2013-09-30T08:24:50Z | |
dc.date.issued | 1969 | |
dc.identifier.citation | Degree of Doctor of philosophy University of East Africa, 1969 | en |
dc.identifier.uri | http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/57239 | |
dc.description.abstract | The impala is a medium-sized antelope found
in Eastern and Central Africa. It is an intermediate. feeding type of "browsing" species with
selective grazin habits but shows little tendency
to migrate. A population in the Riit Valley near
Lake Elmenteita was studied between January 1967
and September 1969, during which period 69 animals
were collected. The prenatal and postnatal female
organs of reproduction were investigated by
dissection, histological and histochemical
techniques. The placenta was also examined with the
electron microscope
Ovulation occurred at random from the left and
right ovary although the, embryo was always found in
the right uterine horn. The development of the ova
and follicle was investigated and a bipha0ic
relationship was established. The process 0f
follicular atresia was studied and evidence put
forward suggesting two waves of of follicular
destruction occured at around estrus time.
The various sstages legding to the establishment
and growth of the corpus luteum were studied. The
corpora lutea were tested for ~he presence of
hydrosteroid dehydrogenase. The mean volume of the hydroxysteroid dehydrogenase . The mean volume
of the corpora luten as well as luteal cell showed a rise during early pregnancy and
precipitous fall just prior to parturition. The
mean luteal cell volune continued to rise even
when there was evidence to sh0w that the cells were
no longer producing increasing amounts of
progesterone. Pigment was Present in the luteal
cells towards the end of pregnancy. The degeneration
of the coruus luteum was studied.
The investigation of the oviduct revealed that
the epithelium undergoes remarkable changes during
the sexual cycle and pregnancy. The uterotubal
junction was examined.
The position, attachment and relations of two
female reproductive organs were investigated by
dissection. Observations were recorded on the
extensive uterine enlargement during pregnancy
The prenatal growth of impalas was studied and a
cube-root weight relationship suggested for a
substantial period of fetal development. The
establishment and development of the placenta was
examined. The relationship between the maternal
and fetal tissues was studied with the electron
microscope, and an euitheliochorial barrier was
found. Observations were made on the vagina and
vestibulum vaginae during the prenatal and postnatal
stages.
Sexual maturity was attained in females shortly
after 12 months of age. Although the impalas bred
throughout the year, two peaks of calvine were
detected during February to May and October to
December , The observation were di sc.u.s.sed and
compared to the body of information already
available on reproduction in the farm animals. | en |
dc.language.iso | en | en |
dc.publisher | University of East Africa, | en |
dc.title | The Microscopic And Microscopic Functional Of The Impala (aepyceros Melampus Lightensein 1912) | en |
dc.type | Thesis | en |