Calving interval

N

Mean ± SE

95% confidence interval

Lower Bound

Upper Bound

Agro-ecology

Highland

65

16.18 ± 0.41

15.565

17.195

Midland

66

15.76 ± 0.41

14.956

16.567

Lowland

40

16.67 ± 0.51

15.664

17.686

Sig.

0.172

Breed

Local cow

120

16.02 ± 0.29b

15.442

16.608

Cross breed cow

51

14.44 ± 0.43a

12.546

17.337

Sig.

0.024

Agro-ecology*breed

Sig.

0.472

Overall

171

16.19 ± 0.25

14.691

16.692