Characterization of follicular dynamics in the Kenyan Boran cow
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Date
2015-07-20Author
Muraya, J
Mutembei, HM
Tsuma, VT
Mutiga, ER
Type
en_USLanguage
enMetadata
Show full item recordAbstract
Follicular dynamics is one of the most important subjects in ovarian physiology. In cows and heifers, it is
characterized by waves of follicular growth and regression. This has been largely studied in European breeds while
studies on Zebu cattle (
Bos indicus
) are limited. Differences between breeds of cattle exist and this information has
been used to establish correct ovulation parameters and management procedures for these breeds. This study aimed at
investigating the follicular dynamics of the Kenyan Boran cow (
Bos indicus
) during its estrous cycle.
Follicular developmental characteristics were evaluated using a 5.0-7.5 Megahertz (MHz) linear array portable
ultrasound device. Transrectal scanning was done daily for a period of two consecutive estrous cycles in 15 Boran
Cows. Predominantly, the cows exhibited three (70.59%) follicular waves per cycles while a smaller population of the
cows (25.53%) exhibited two follicular waves per cycle. Of the animals used, (5.88%) had four follicular waves per
cycle. The pre-ovulatory dominant follicle size for the
Kenyan Boran cow was recorded as 13.56±1.73 mm and was
higher than the diameter of all the other dominant follicles. The duration of dominance of wave one was
approximately three days longer and the onset of atresia of the first wave occurred approximately two days later in
two-wave cycle animals than in three-wave cycle animals (P<0.05). There was no significant difference in cows with
different waves per cycle.
This study observed that like in other Boran breeds the follicular dynamics in the Kenyan Boran cow are characterized
by a higher incidence of cycles that have three follicular waves associated with a short persistence of the dominant
follicle of the first wave.
URI
http://www.ijvets.com/pdf-files/Volume-4-no-4-2015/206-210.pdfhttp://hdl.handle.net/11295/92095
Citation
Muraya, J., Mutembei,HM., Tsuma, VT and Mutiga, ER (2015).Publisher
University of Nairobi