Murray Rogerson

          
       

COMPARING LAMB PRODUCTION SELECTION METHODS

Stirling 2016 Ram Catalogue – 50 rams

BIRTH & WEAN TYPE CATALOGUE NOS. AV. NLW ASBV’s AV. A.D.W.R
SINGLE BORN 19 -2.6 0.55
SINGLE WEAN 27 -2.1 0.54
TWIN BORN 31 -1 0.61
TWIN WEAN 23 -1 0.65

Remember that birth type and wean type are single year events whereas N.L.W and ADWR are generationally linked sheep like apple trees bear on second-year wood.
1.    Note that ADWR’s slight decrease from single born to single wean can be explained by the increased number of twin-born in the column which will be lighter.
2.    Note NLW’s record of no difference between twin-born and twin wean is a figure failure within a strategic area of selection within properly.

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