Abstract
In vitro maturation (IVM) of oocytes provide an excellent opportunity for cheap and abundant embryos for carrying out animal improvement. With the aim for studying the quality of oocyte in different seasons of Black Bengal goat, both right and left ovaries were collected from the slaughter houses. For each of the specimens, gross parameters such as right, left, corpus luteum (CL)-present and corpus luteum (CL)-absent group were evaluated on the basis of weight (g), length (cm), width (cm), follicles aspirated and number and state of cumulus-oocyte-complexes (COCs), normal COCs and abnormal COCs, the effect of season on cumulus oocyte complexes (COCs) of goat oocytes. Our study revealed that the average number of follicles and oocytes recovery rate were higher in summer than in winter season and recovery rate of grade A and B oocytes were higher in summer than that of in winter and recovery rate of grade C and D were higher in winter than that of in summer. In the present study a significantly greater number of oocytes per ovary were recovered from ovaries without a corpus luteum than from ovaries with a corpus luteum. So the summer was the best season for recovery of COCs which have a worthy competence to be matured in vitro.
 Asian Australas. J. Biosci. Biotechnol. 2020, 5 (3), 78-87
Highlights
Goat is a multi-functional animal and contributes a great rule to the rural economy of Bangladesh
The result is very common as the hypertrophy of luteinized granulosa cells, hyperplasty of fibroblasts of the connective tissues and vascularity contribute to an increase in size of the corpus luteum (CL) (Jablonka-Shariff et al, 1993)
The results obtained in the present study showed that recovery rate of grade A and B oocytes were higher in summer than that of in winter and recovery rate of grade C and D were higher in winter than that of in summer
Summary
Goat is a multi-functional animal and contributes a great rule to the rural economy of Bangladesh. Goat population has increased at the rate of 10% per annum with a continuous reduction of cattle (0.21% per annum) from 1970 to 2003 (FAO, 1970 and 2003). Seasonal effect was found an important consideration in this respect, especially in buffalo (Kadoom, 1995 and Das et al, 1996), mare (Bruck et al, 1996 and Colleoni et al, 2004) and cattle (Silva et al, 2006). The incubation temperature during the in vitro maturation (IVM) influenced the fertilization rate but had no effect on maturation and subsequent embryo development (Ravindranatha et al, 2003). Al-Katanani et al (2002) reported that summer depression in oocyte quality in Holstein cow was evident, but cooling cow for 42 days did not alleviate that seasonal effect. The present study was, designed with the objectives to evaluate oocyte recovery rates and their quality from goat ovaries collected at local abattoir in two different seasons, to characterize the ovary and oocyte
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