Parameter |
No. of studies |
Mean |
Median |
Minimum |
Maximum |
|
Semi-arid zone |
||||||
|
Lamb mortality risk (%) |
17 |
26.6 |
25.0 |
13.0 |
50.0 |
|
Female replacement mortality risk (%) |
7 |
9.4 |
8.0 |
4.0 |
17.0 |
|
Male replacement mortality risk (%) |
8 |
8.9 |
8.0 |
4.0 |
17.0 |
|
Ewe mortality risk (%) |
10 |
7.5 |
6.5 |
1.7 |
13.0 |
|
Age at first lambing (months) |
13 |
16.9 |
15.2 |
11.0 |
48.0 |
|
Lambing rate (%) |
14 |
119.1 |
119.5 |
90.0 |
154.0 |
|
Prolificacy |
21 |
1.11 |
1.08 |
1.02 |
1.42 |
|
Offtake rate (%) |
5 |
15.6 |
10.0 |
1.8 |
27.0 |
|
Weight of mature ewes (kg) |
15 |
32.1 |
30.6 |
25.0 |
43.8 |
|
Weight of mature rams (kg) |
10 |
31.6 |
30.9 |
18.2 |
48.7 |
Subhumid zone |
||||||
|
Lamb mortality risk (%) |
23 |
25.6 |
25.0 |
13.0 |
43.8 |
|
Female replacement mortality risk (%) |
9 |
7.8 |
9.6 |
3.9 |
10.0 |
|
Male replacement mortality risk (%) |
8 |
8.3 |
9.8 |
5.0 |
10.0 |
|
Ewe mortality risk (%) |
15 |
11.1 |
9.6 |
4.5 |
23.0 |
|
Age at first lambing (months) |
7 |
16.2 |
15.0 |
14.1 |
21.6 |
|
Lambing rate (%) |
15 |
113.3 |
115.0 |
60.0 |
160.0 |
|
Prolificacy |
25 |
1.16 |
1.12 |
1.03 |
1.31 |
|
Offtake rate (%) |
4 |
27.2 |
31.5 |
7.8 |
38.0 |
|
Weight of mature ewes (kg) |
19 |
22.7 |
23.0 |
15.0 |
30.0 |
|
Weight of mature rams (kg) |
14 |
26.7 |
28.1 |
16.4 |
36.7 |
Humid zone |
||||||
|
Lamb mortality risk (%) |
6 |
24.7 |
17.0 |
8.6 |
46.7 |
|
Female replacement mortality risk (%) |
2 |
17.0 |
17.0 |
10.0 |
24.0 |
|
Male replacement mortality risk (%) |
2 |
28.6 |
37.0 |
10.0 |
47.3 |
|
Ewe mortality risk (%) |
4 |
16.1 |
14.6 |
10.0 |
25.0 |
|
Age at first lambing (months) |
n.r.1 |
n.r. |
n.r. |
n.r. |
n.r. |
|
Lambing rate (%) |
9 |
116.9 |
115.0 |
90.0 |
154.6 |
|
Prolificacy |
6 |
1.09 |
1.05 |
1.02 |
1.31 |
|
Offtake rate (%) |
5 |
19.0 |
20.0 |
5.2 |
25.0 |
|
Weight of mature ewes (kg) |
4 |
27.5 |
27.5 |
20.0 |
35.0 |
|
Weight of mature rams (kg) |
1 |
30.0 |
30.0 |
30.0 |
30.0 |
Highland zone |
||||||
|
Lamb mortality risk (%) |
10 |
23.3 |
20.0 |
6.5 |
51.5 |
|
Female replacement mortality risk (%) |
3 |
6.4 |
7.6 |
1.8 |
10.0 |
|
Male replacement mortality risk (%) |
1 |
10.0 |
10.0 |
10.0 |
10.0 |
|
Ewe mortality risk (%) |
6 |
9.7 |
9.5 |
7.5 |
14.1 |
|
Age at first lambing (months) |
n.r. |
n.r. |
n.r. |
n.r. |
n.r. |
|
Lambing rate (%) |
8 |
108.2 |
111.0 |
84.2 |
125.0 |
|
Prolificacy |
8 |
1.11 |
1.09 |
1.02 |
1.24 |
|
Offtake rate (%) |
2 |
25.1 |
25.1 |
25.0 |
25.1 |
|
Weight of mature ewes (kg) |
5 |
34.1 |
30.0 |
27.7 |
42.0 |
|
Weight of mature rams (kg) |
2 |
29.4 |
29.4 |
28.7 |
30.0 |
1 n.r. = no reference