In vitro production (IVP) of embryos is one of the popular animal reproductive
biotechnologies to enhance the genetic improvement of livestock. However, insufficiency of
good quality oocytes has become one of the major constraints in producing embryos from IVP.
Thus, a preliminary evaluation of ovaries could provides information for further experiment
regarding IVP of cattle embryos. The objective of the present study was to evaluate the
morphology of ovaries from different breed of cattle, including surface follicles and
follicular health status. Thirty two (32) ovaries from Kedah-Kelantan breed and 32 ovaries
from crossbred cows were collected from an abattoir in Taiping, Perak. Follicles visible on the
surface of each ovary were counted and the weight, length and width of the ovaries were measured.
The ovaries were then fixed and processed for microscopic evaluation, where the number of
healthy and atretic follicles were counted. The mean ovarian weight, length, width and
number of surface visible ovarian follicles of crossbred cows were found significantly
higher (7.81 ± 0.61 g, 3.30 ± 0.09 cm, 2.31 ± 0.07 cm and 29.66 ± 2.32, respectively)
compared to Kedah-Kelantan cows (3.22 ± 0.33 g, 2.60 ± 0.08 cm, 1.80 ± 0.07 cm and 20.97 ± 2.04,
respectively). The mean percentage of healthy follicles in the ovaries of Kedah-Kelantan and
crossbred did not differ significantly (41.12 ± 5.24 and 48.61 ± 10.15, respectively).
In conclusion, breed of cows had statistically significant influence on the surface follicles,
but not significant in follicular health status. Further research study of breed factor on
oocytes are required for successful IVP of cattle embryos.
KEYWORDS:
Breed of cow; Crossbred cow; Follicles; Kedah-Kelantan; Ovarian Morphology
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