|
Parameter |
No. of studies |
Mean |
Median |
Minimum |
Maximum |
|
|
Arid/semi-arid zones |
||||||
|
|
Calf mortality risk (%) |
17 |
10.2 |
7.0 |
4.0 |
23.0 |
|
|
Female/male replacement mortality risk (%) |
n.r.2 |
n.r. |
n.r. |
n.r. |
n.r. |
|
|
Cow mortality risk (%) |
7 |
5.7 |
3.5 |
1.0 |
10.0 |
|
|
Age at first calving (months) |
n.r. |
n.r. |
n.r. |
n.r. |
n.r. |
|
|
Calving rate (%) |
31 |
76.6 |
74.0 |
55.0 |
94.0 |
|
|
Milk offtake per lactation (kg) |
6 |
185.0 |
120.0 |
34.0 |
595.0 |
|
|
Weight of mature cow (kg) |
12 |
414.0 |
418.0 |
280.0 |
466.0 |
|
|
Weight of mature bull (kg) |
2 |
495.0 |
495.0 |
450.0 |
540.0 |
|
Subhumid and humid zones |
||||||
|
|
Calf mortality risk (%) |
13 |
10.1 |
8.0 |
1.0 |
23.0 |
|
|
Female/male replacement mortality risk (%) |
3 |
7.8 |
10.0 |
3.0 |
10.0 |
|
|
Cow mortality risk (%) |
5 |
6.2 |
5.8 |
1.5 |
10.0 |
|
|
Age at first calving (months) |
2 |
41.0 |
41.0 |
40.0 |
42.0 |
|
|
Calving rate (%) |
17 |
76.2 |
75.3 |
57.0 |
92.0 |
|
|
Milk offtake per lactation (kg) |
2 |
750.0 |
750.0 |
700.0 |
800.0 |
|
|
Weight of mature cow (kg) |
4 |
309.0 |
295.0 |
286.0 |
363.0 |
|
|
Weight of mature bull (kg) |
2 |
440.0 |
440.0 |
430.0 |
450.0 |
1 Reported parameters for ranching systems in the highlands are 13.8% calf mortality risk, 5.5% replacement mortality risk and 83% calving rate
2 n.r. = no reference
