A	Total ewes joined
B	Marking percentage (convert % to decimal e.g. 98% = 0.98)
C	Weaning percentage (convert % to decimal e.g. 100% = 1)
D	Number of lamb/hogget ewes available = ((A x B) x C) / 2
E	Number of adult ewes in the year groups	2 years
		3 years
		4 years
		5 years
		6 years
		7 years
		8 years
		Total
F	Number of adult ewes in the flock = D + E
G	The oldest year group joined?
H	Number of adult ewes culled for age
I	Number of adult ewes culled for other reasons (e.g. reproductive performance, structure, flystrike etc.)
J	Number of adult ewes culled from the flock = H + I
K	Adult ewe mortality percentage
L	Number of adult ewes to replace or number of ewe lamb/hoggets to retain = J + (E x K)
M	Ewe lamb/hogget retention percentage = L / D x 100

Note: if retention (M) is over 100% you require more than produced to maintain flock numbers

Note: if retention (M) is less than 50% consider what other aspects of the calculation you may be able to tweak to improve rates of genetic progress towards breeding objective (oldest year group joined, number of ewes culled for other reasons etc).

Source: AWI ClassiFly

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Module 1 Plan for Success Module 2 Market Focused Wool Production Module 3 Market focused lamb and sheepmeat production Module 4 Capable and Confident People Module 5 Protect Your Farm’s Natural Assets Module 6 Healthy Soils Module 7 Grow More Pasture Module 8 Turn Pasture into Product Module 9 Boost Business with Breeding Module 10 Wean More Lambs Module 11 Healthy and Contented Sheep Module 12 Efficient Pastoral Production

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