Table 2.

Mean (± s.e.m.) distance to the geometric center (mm) of normal and abnormal equine preantral follicles according to different ovarian portions (lateral and intermediary) and regions (dorsal and ventral).

Ovarian regions	Ovarian portion§
	Lateral		Intermediary		Combined portions
	Normal	Abnormal	Normal	Abnormal	Normal	Abnormal
Dorsal (n  = 5374) †	5.54 ± 0.05aAX	5.38 ± 0.11aAX	5.16 ± 0.05aAY	4.68 ± 0.14bAY	5.36 ± 0.04aA	5.15 ± 0.08aA
Ventral (n  = 3910)	5.60 ± 0.08aBX	6.01 ± 0.19bBX	7.22 ± 0.08aBY	6.07 ± 0.14bBX	6.37 ± 0.06aB	6.04 ± 0.12aB
Combined regions	5.57 ± 0.04aX	5.61 ± 0.10aX	6.01 ± 0.05aY	5.37 ± 0.10bX	5.78 ± 0.03a	5.52 ± 0.07a

^§Ovaries were divided longitudinally into three portions: two lateral and one intermediary. Five representative ovarian maps were evaluated per ovarian portion (n  = 15 maps per ovary, n  = 240 maps in total). Only histological sections with clear borders and intact ovulation fossa, without lacerations, were chosen for ovarian mapping. ^†Number of preantral follicles of all classes (primordial, transitional, primary, secondary) evaluated per ovarian region. ^a,bBetween morphological classifications and within each ovarian portion and region, values without a common superscript differed (P < 0.05). ^A,BBetween ovarian regions and within each ovarian portion and morphological classification, values without a common superscript differed (P < 0.05). ^X,YBetween ovarian portions and within each ovarian region and morphological classification, values without a common superscript differed (P < 0.05).