Table 1 Growth and reproductive performance of the heifers with superior or inferior reproductive performance

Item

(n = 26)

(n = 23)

p-value

Age at measured (d)

304.88 ± 1.13

305.78 ± 1.10

0.35

Withers height (cm)

120.50 ± 0.85

121.22 ± 0.81

0.28

Body length (cm)

116.81 ± 1.40

114.96 ± 1.32

0.17

Body weight (kg)

315.73 ± 5.46

301.17 ± 4.35

0.07

AI number

1.04 ± 0.04

3.87 ± 0.27

 < 0.01

Pregnancy rate (%)

At first AI

96.15 (25/26)

–

–

At second AI

3.85 (1/26)

13.04 (3/23)

–

At third AI

–

21.74 (5/23)

–

At forth or more AI

–

65.22 (15/23)

–

Age at successful AI (d)

339.96 ± 5.98

468.35 ± 12.95

 < 0.01