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Effects of Artificial Lighting on Feeder Lamb Performance^1,2,

Washington State University, Pullman 99164

Abstract

Three experiments were conducted to determine the effects of artificial lighting on lamb performance. A spring trial (April to June) compared three lighting regimens to natural lighting. A summer (July to September) and winter (November to January) trial observed possible interactive effects of lighting and other related factors, i.e., shearing, sex, diet roughage level and night arousing.

The results of these experiments indicated that artificial night lighting does not significantly affect growth rate, feed efficiency or carcass characteristics. No significant interactions were found between night lighting and the other factors evaluated in these experiments.

Wether lambs were found to gain faster than ewes and shorn lambs faster than unshorn lambs (summer trial). Lambs fed a low roughage diet gained faster and were more efficient than lambs fed an all-roughage diet. Night arousing did not affect the performance of the lambs.

¹ Scientific Paper No. 5025. College of Agriculture Research Center, Washington State University, Pullman. Project No. 0258.

² Financial assistance of the Washington Woolgrowers Association during these trials is gratefully acknowledged.