The protocol for the experiment was approved by the Langston University Animal Care and Use Committee. The study was conducted in anenclosed building during January to March, 2012, with lighting provided from 07:00 to 19:00 h. The experiment was 10 wk in length, with five 2-wk periods. Thirty six Boer goat wethers were used, with an initial age of 285 days (SEM = 5.1) and body weight (BW) of 34.4 kg (SEM = 0.90). Wethers were allocated to six groups for similar BW (P > 0.99; t-test) and variation