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Performance of Early-Weaned Lambs as Affected by Sound Type and Intensity¹

Kansas State University, Manhattan, Kansas 66502

Abstract

Early-weaned lambs were subjected to three types of noise: United States of American Standard Institute (USASI) Noise; instrumental music; and intermittent miscellaneous sounds (IMS), at 75 and 100 dB intensities. USASI and IMS at 75 dB intensity increased average daily gain significantly (P<.05), from 0.23 to 0.41 kg and from 0.16 to 0.39 kg, respectively; feed efficiency was also improved. Pooled data from the three trials indicated that both sound type and intensity significantly affected lamb performance. Lambs exposed to music were calm and more docile compared to lambs subjected to USASI and IMS noise. Acclimatization to sound was evident. Neural and neuroendocrine effects are proposed as possible mechanisms of action.

¹ Kansas Agricultural Experiment Station, Manhattan, 66502. Contribution No. 423, Department of Animal Science and Industry.

² Present address: Colby Branch Experiment Station, Colby, Kansas.