Sheep Breeding Model

Lamb Growth Rate Reduction

0
-5%
-10%
-15%
-20%
Ewe LW (1 July)
64
63
62
61
60
Scanning Efficiency (mating weight)*
2.58%
2.58%
2.58%
2.58%
2.58%
Scanning %
156
154
151
149
146
Lambing %
119
117
115
114
112
Ewe Lamb Growth Rate
75
71
67
63
59
Trade Lamb Growth Rate
100
95
90
85
80
Ewe Sale Weight
24.1
23.7
23.3
22.9
22.5
Ewe Sale Price/kg
$2.29
$2.29
$2.29
$2.29
$2.29
Ewe Sale Price
$55.19
$54.27
$53.36
$52.44
$51.53
Lamb Sale Weight
16.7
16.1
15.6
15.2
14.7
Lamb Sale Price/kg
$4.72
$4.71
$4.70
$4.69
$4.66
Lamb Sale Price
$78.82
$75.83
$73.32
$71.29
$68.50

 

  • The same number of lambs are sold each month in all models.
  • The difference in ewe lamb LW is carried through into the ewe weights.
  • The total reduction in lamb price is over original lamb numbers.
  • Wool weight and price are the same in all models.
  • Scanning percentage divided by the ewe mating weight.
 
 

Lamb Finishing Model

  • All lambs are eating the same amount of feed per day.
  • Lower growth rate of lambs mean they take longer to finish.
  • Given a set quantity of feed there are therefore less lambs finished.
  • 10% lower growth rate means 10% less lambs finished.