Table 1. The ratio (%) of each type of spermatogenesis pattern in cross section of round seminiferous tubules between PBS and multiple busulfan injection group

Group	PBS				Busulfan
Horse ID	C1	C2	C3	Mean ± SEM	T1	T2	T3	Mean ± SEM
Normal	98.2	100	97.6	98.8 ± 0.9^a	4.8	15.8	21	13.8 ± 4.7^b
Sertoli cell only	0	0	0	0^a	85.2	71.2	41	65.8 ± 13^b
Abnormal	1.8	0	2.4	1.4 ± 0.7^a	10	13	38	20.3 ± 8.8^a

Means with different superscript letters are significantly different (p < 0.05).
PBS, phosphate-buffered saline; C, control; T, treatment.