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The oocytes (experiment 1) were harvested by one of the four collection techniques (slicing, punc - ture, aspiration I and aspiration II) and the total number and the number of each grade of oocytes were counted, respectively. The good-quality oocytes (good and fair grade) were cultured for maturation. In experiment 2, the oocytes were matured in TCM-199 supplemented with 10 ng/ml of epidermal growth factor (EGF) or 10% FCS, either alone or with 1 IU/ml FSH, or the oocytes were matured in TCM-199 supplemented with 1 IU/ml FSH. After maturation, the oocytes in the two experiments were fertilized, respectively. Slicing (6.3) and puncture (5.8) of the ovaries yielded a higher ( < 0.05) number of oocytes per ovary compared to aspiration I (2.9) and aspiration II (3.1). Oocytes matured in the TCM-199 medium supplemented with EGF or FCS with FSH had a significantly higher proportion of blastocysts than the other treatments ( P < 0.05). In conclusion, slicing and puncture are alternative techniques of oocyte recovery in Boer goat. The TCM-199 medium supplemented with EGF or FCS in the presence of FSH is suitable for in vitro maturation of oocytes.

Effects of oocyte collection techniques and maturation media on in vitro maturation and subsequent embryo development in Boer goat