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Effect of Removal of Follicles through Repeated Transvaginal Follicle Aspiration on Subsequent Follicular Populations in Murrah Buffalo (Bubalus bubalis

  • Akshey, Y.S. (Animal Biotechnology Centre, National Dairy Research Institute) ;
  • Palta, P. (Animal Biotechnology Centre, National Dairy Research Institute) ;
  • Manik, R.S. (Animal Biotechnology Centre, National Dairy Research Institute) ;
  • Vivekananad, Vivekananad (Animal Biotechnology Centre, National Dairy Research Institute) ;
  • Chauhan, M.S. (Animal Biotechnology Centre, National Dairy Research Institute)
  • Received : 2004.09.22
  • Accepted : 2004.12.24
  • Published : 2005.05.01

Abstract

This study was conducted to investigate the effects of removal of all ovarian follicles through repeated transvaginal follicle aspiration (TVFA) on the subsequent follicular populations in buffaloes. This information is crucial for determining the optimum time interval between successive aspirations for recovering oocytes from live buffaloes through Transvaginal Oocyte Retrieval (TVOR). The oestrus of cycling buffaloes (n=5) were synchronized by a single PGF injection schedule. All the ovarian follicles were removed once every 7 days for 6 weeks through TVFA, starting from Day 7 of the oestrous cycle (Day 0 = day of oestrus). The number and size of individual ovarian follicles was recorded at Day 3 and Day 5 (Day 0 = day of TVFA) through transrectal ultrasonography. The follicles were classified on the basis of their diameter as small (3-5 mm), medium (6-9 mm) and large ($\geq$10 mm). There was no difference in the number of small and medium follicles, and the number of total follicles between Day 3 and Day 5. However, the number of large follicles was significantly higher (p<0.05) at Day 5 than that at Day 3. There was a significant (p<0.05) decrease in the proportion of small follicles and an increase (p<0.05) in the proportion of large follicles from Day 3 to Day 5, with no change in the proportion of medium follicles. The number of total follicles at Day 3 or Day 5 did not differ during the 6 TVFA sessions. It can be concluded that an interval of 3 days is more suitable than that of 5 days between successive aspirations for recovering oocytes through TVOR in a twice weekly schedule and that repeated removal of follicles through TVFA does not adversely affect the number of total follicles 3 or 5 days after TVFA.

Keywords

Buffalo;Follicles;Ovum Pick-up;TVOR

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