Table 1. Changes in corpus luteum and coexistent follicle size before embryo transfer (n = 145)

Group¹⁾	E2/P4		2FTET		J-synch		Total
Group¹⁾	No. of cow	%	No. of cow	%	No. of cow	%	No. of cow	%
Only CL	4	10.0	5	6.8	2	6.3	11	7.6^a2)
CL + MF	9	22.5	1	1.4	2	6.3	12	8.3^a
CL + LF	22	55.0	56	76.7	23	71.9	101	69.7^b
LF	5	12.5	9	12.3	3	9.4	17	11.7^a
X	0	0.0	2	2.7	2	6.3	4	2.8^a
Total	40	100.0	73	100.0	32	100.0	145	100.0

Only CL, only the corpus luteum is present in the left or right ovary; CL + MF, medium (5–10 mm) coexistent follicle with corpus luteum; CL + LF, large (> 10 mm) coexistent follicle with corpus luteum; LF, no corpus luteum, only a large-sized coexistent follicle; X, neither a corpus luteum nor a follicle is detected.
Corpus luteum and follicle size was analyzed using the chi-square test.
Values with different letters, a and b, are significantly different at p < 0.001.
E2/P4, estradiol/progesterone; FTET, fixed-time embryo transfer.