Table 2. Effects of heat stress on the in vitro maturation of Holstein and Jersey oocytes

Breed Temperature No. of GV oocytes No. of oocytes with the 1st PB (%)
Holstein 38.5°C 78 69 (88.4)
40.5°C 80 62 (77.5)
Jersey 38.5°C 59 52 (88.1)
40.5°C 64 53 (82.8)
Fisher’s exact with correction p = 0.0521 (Holstein) 0.2823 (Jersey).
GV, germinal vesicle; PB, polar body.