Muhammad Husnain (2008-VA-281)

Comparison Between Aspiration And Slicing Methods For Retrieval Of Oocytes In Bovine - 2015. - 31p.;

Livestock contribution to agriculture stood at 55.9 percent while it contributes 11.8 percent to the national GDP during 2013-14. Buffalo, cattle, sheep and goat population in Pakistan is 34.6, 39.7, 29.1 and 66.6 million numbers during 2013-14. Total milk production from buffalo and cattle as major milk producing animals is 31,252 and 18,027 (000 tons) (Economic Survey of Pakistan 2013-14).
Advanced biotechnologies coming from different areas of biological sciences exhibit great promise to enhance the efficiency of livestock production. From these technologies one such biotechnology is the use of in vitro maturation of follicular oocytes and in vitro fertilization for production of livestock embryos in laboratory. Proper oocytes recovery and their selection in the laboratory are of great importance for successful in vitro embryo production. Total one hundred and forty four ovaries (n=144) from cattle (72 ovaries) and buffalo (72 ovaries) were collected and 223 oocytes were retrieved from these ovaries. Average oocytes per ovary were 1.66 + 0.43 oocytes per ovary were obtained via aspiration and 1.89 + 0.00 average oocytes per ovary through slicing method from cattle ovaries. Average 1.55 ± 0.55 oocytes per ovary via aspiration and 1.53 ± 0.20 oocytes per ovary through slicing from buffalo ovaries.
Overall grade-A oocytes were 28 (40) percent with aspiration in cattle and 25(36.76) through slicing method. In buffalo overall grade-A oocytes retrieval was obtained in percentage as 20 (44.44) and 26 (52) through aspiration and slicing methods respectively. Grade-B oocytes recovery obtained was in percentage as 23 (33.82) with slicing and 19 (31.67) through aspiration technique from cattle ovaries.
Commonly used methods of recovery of oocytes from slaughterhouse animals are aspiration and slicing. Recovery rate of oocytes is different from slaughterhouse ovaries. Aspiration is the best method for retrieval of good quality oocytes from slaughterhouse bovine ovaries because it gave more good quality oocytes in less time than slicing method. In this study, it is found that weight of ovary and no. of follicles/ovary in cattle have strong correlation of 71% existed between weight of ovary and no. of follicles /ovary in buffalo was observed. Correlation between average number of follicles on ovary and weight /ovary was stronger in cattle. The more the number of follicles present on the ovaries and more weight of the ovary, the more will be the recovery of oocytes.
In cattle average number of follicles was 10.09 ± 0.30 and when it was checked in buffalo, differed significantly and it was found as 7.16 ± 0.19 on an average per ovary. Likewise weight of buffalo in this study was differed significantly from cattle 4.04 ± 0.10 and 7.62 ± 0.15 respectively. It is suggested that oocytes retrieval should be done in buffalo using aspiration method to retrieve better quality oocytes.
It is concluded that aspiration is the suitable method for retrieval of good quality oocytes from slaughterhouse buffalo ovaries because it gave more good quality oocytes in less time than slicing method. But both methods have minor difference between recovery rates but aspiration is more convenient than slicing and it yields more quality oocytes. It is also found that there is very strong correlation existed between average weight of ovary and number of follicles per ovary and the both parameters play a great help for more quality and quantity oocytes.

Department of Theriogenology


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