Table 2.

Average involution period (Mean ± SEM) of cervix uteri and horns in a different age of Holstein cows.

Age/years	No. of cows	Cervix uteri (Days)	Gravid uterine horn (Days)	Non-gravid uterine (Days)
2	19	31.1 ± 0.4a	29.4 ± 0.4ab	28.9 ± 0.4a
3	26	30.5 ± 0.4ab	29.8 ± 0.4a	29.0 ± 0.4a
4	14	29.0 ± 0.4b	26.8 ± 0.4c	26.2 ± 0.8b
≥5	50	29.2 ± 0.3b	27.2 ± 0.5bc	26.3 ± 0.4b

Different lowercase superscripts within a column differ significantly (P < 0.05).