Objectives
The objectives of the study were primarily:
-
to compare the performance of the Red Maasai and Dorper breeds
and their crosses in terms of their productivity under
high disease risk
- to study genetic sources of
variation among lambs within the two breeds and their crosses
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The
first objective was examined in Case Study 3 using
weaning weight as one of the performance criteria.
Here we
examine the second objective, namely incorporation of random effects to
study variations among rams (sires) and ewes (dams) and their influences
on lamb weaning weight. |