EFFECTS OF EXPERIMENTAL TRYPANOSOMA VIVAX INFECTION ON THE OESTROUS CYCLE OF MATURE YANKASA EWES
EFFECTS OF EXPERIMENTAL TRYPANOSOMA VIVAX INFECTION ON THE OESTROUS CYCLE OF MATURE YANKASA EWES
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Date
1989-12
Authors
ADENOWO, THOMAS KEHIMDE OLUWAFEMI
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Abstract
Twelve mature Yankasa sheep (6 infected and 6
control ewes) were used to investigate the effects of
experimental Trypanosoma vivax infection on selected
reproductive organs and on oestrous cycle parameters.
Daily rectal temperatures and weekly body weights were
taken, and blood samples for haematology were also
collected twice a week from all the animals before and
after the infection.
Prior to infection, oestrus was synchronised using
progestagen sponges, following which animals were
observed for oestrus signs twice daily (A.M. arid P.M.)
using a vasectomised ram. Heat observations were
carried out daily and plasma for progesterone
determination collected every other day for 2 cycles to
assess oestrous cycle parameters prior to infection and
subsequently till end of the experimental period.
Undulating parasitaemia, hyperthermia and anaemia
were observed in infected ewes following T. vivax
infection. Three types of abnormal oestrus occurred
based on progesterone profiles: 2 infected ewes showed
silent oestrus, 2 others exhibited temporary anoestrus
while the last 2 showed complete anoestrus. These
oestrus anomalies were associated with various degrees
of pathological observations such as mononuclear
(mostly lymphocytes and macrophages) cellular infiltration
and necrosis of the anterior pituitary gland,
and hyalinization of the ovary with no evidence of
follicular development. These results confirm that T.
vivax infection can adversely affect reproduction
through interference with ovarian activity and other
reproductive organs of Yankasa ewes.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE AOSCFH IMEATNDHCUE E ,RB EEDQLEULPIOAR RETUMMNEEINNVTTES R OSFFIO TRVY E TTIHENER IDPNEAARGRYRT EIPEA ALR OAFFS ULTIMATUM OSILTSLOECLGRHMY OE ONOTLF AND ENTOMOLOGY, AHMADU BELLO, UNIVERSITY, ZARIA KADUNA STATE, NIGERIA
DECEMBER, 1989.
Keywords
EFFECTS,, EXPERIMENTAL,, TRYPANOSOMA,, VIVAX,, INFECTION,, OESTROUS CYCLE,, YANKASA EWES,, MATURE.