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Table 2 Differences among species in follicle diameter, oocyte diameter and number of granulosa cells

From: Ultrastructural changes in oocytes during folliculogenesis in domestic mammals

Species Follicular diameter (μm) Oocyte diameter (μm) Mean number of granulosa cells
  PL PR S PL PR S PL PR S
Cattle [44] 36 49 88 28 32 44 7 15 62
Buffalo [45] 35 42 53 25 27 29 4-8 8-20 -
Sheep [46] 41 75 129 35 52 73 16 128 637
Goat [47] 20 24 44 16 17 25 6 11 31
Cat [39] 28 41 75 23 30 41 7 13 46
Dog [41] 28 43 102 22 28 48 6 15 62
Human [48] 35 42 77 32 32 48 13 52 360
Pig [49] 34 40 85 26 27 39 5 8 50
  1. PL: primordial follicle, PR: primary follicle, S: secondary follicle.