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Appendix 9. Sheep production parameters of mixed systems in sub-Saharan Africa


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


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