2.1. Experiment 1: N balance study
Five wethers (5272 kg) were used in an incomplete
5 4 Latin square design (Cochran and Cox, 1957) to
evaluate the efficiency of N use in lambs offered supplements
in which urea or SBM provided the primary source
of supplemental N (Table 1). Wethers were allotted randomly
to treatments and housed in individual metabolism
crates within an enclosed barn with continuous lighting.