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Table 1 Animal studies on follicle size and IVF outcomes

From: A critical review of bi-dimensional and three-dimensional ultrasound techniques to monitor follicle growth: do they help improving IVF outcome?

 

Animal species

Oocytes

Syze mm

% MII

% fert

% cleavage

% blastocyst formation

% hatching

Lonergan 1994 [5]

Bovines

290

6

n.e.

n.e.

n.e.

Increasing

n.e.

Feng 2007 [3]

Bovines

427

4-6

n.e.

n.e.

Increasing from 4 mm onwards

Always increasing

Always increasing

De Bem 2014 [4]

Bovines

227

3-6

n.e.

n.e.

Increasing from 6 mm onwards

Increasing from 6 mm onwards

None

Raghu 2002 [6]

Buffalos

780

3-8

n.e.

Always increasing

Always increasing

Always increasing

n.e.

Caixeta 2009 [7]

Buffalos

240

3-6-8

n.e.

n.e.

n.e.

Increasing from 8 mm onwards

n.e.

Hinrichs 2000 [8]

Horses

10753

6-11

Always increasing Together with% of condensed chromatin

n.e.

n.e.

n.e

n.e.

Khatir 2007 [9]

Dromedaries

399

6

None

n.e.

Increasing

Increasing

None, but any pregnancy under 6 mm

Crozet 1995 [2]

Goats

543

3-5

Always increasing

n.e.

Increasing from 5 mm onwards

None

n.e.

Romaguera 2011 [1]

Goats

313

3

n.e.

n.e.

None

Increasing

None

Marchal 2002 [10]

Pigs

941

3-5

Increasing from 3 mm onwards

Increasing from 3 mm onwards

n.e.

Increasing from 3 mm onwards

n.e.

Bagg 2007 [11]

Pigs

928

3-4-5

n.e.

n.e.

n.e.

Always increasing

n.e.

  1. Only results statistically significant are reported (p < 0.05); all results are referred to size classes reported.
  2. n.e. = outcome not evaluated.
  3. none = any significant difference among size classes.
  4. always increasing = increasing from each size class onwards.