N

Mean ± SE

95% confidence interval

Lower Bound

Upper Bound

Agro-ecology

Highland

48

3.24 ± 0.154^b

2.929

3.543

Midland

48

3.57 ± 0.154^b

3.264

3.878

Lowland

16

1.69 ± 0.266^a

1.164

2.228

Sig.

0.016

Breed

Local

48

1.94 ± 0.154^a

1.638

2.252

Local*jersey

32

4.17 ± 0.188^b

3.797

4.549

Local*HF

32

3.97 ± 0.188^b

3.592

4.344

Sig.

0.000

Lactation stage

Early lactation

112

2.99 ± 0.174^b

2.649

3.345

Mid lactation

112

4.12 ± 0.174^c

3.773

4.470

Late lactation

112

2.36 ± 0.174^a

2.013

2.709

Sig.

0.000

Overall

2.98 ± 0.12

2.959

3.361