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Journal of Animal Science, Vol 78, Issue 6 1636-1640, Copyright © 2000 by American Society of Animal Science

JOURNAL ARTICLE

Effect of individual terpenes on consumption of alfalfa pellets by sheep

R. E. Estell, E. L. Fredrickson, D. M. Anderson, K. M. Havstad and M. D. Remmenga
USDA/ARS Jornada Experimental Range, Las Cruces, NM 88003-0003, USA. restell@nmsu.edu

We examined effects of individual terpenes on alfalfa pellet intake of lambs in five experiments. Forty-five lambs (nine lambs/treatment) were individually fed alfalfa pellets sprayed with either p-cymene, alpha-humulene, 1,8-cineole, 3-carene, or sabinene at one of five concentrations (one terpene per experiment). Treatments (0, .5, 1, 2, and 10x) were multiples of the concentration (x) of a specific terpene in tarbush that was related to differential herbivory by livestock in previous studies. Terpenes were applied to alfalfa pellets (.64 kg x lamb(-1) x d(-1), DM basis), and consumption was measured during a 20-min interval for 5 d. Lambs were adapted to handling and pen feeding for 10 d and were maintained and fed alfalfa pellets in one group (except during 20-min tests) at a mean total daily intake of 4.7% of BW (DM basis). None of the five compounds decreased alfalfa pellet consumption during the 20-min interval. These five mono- and sesquiterpenes do not seem to be responsible for differential herbivory of individual tarbush plants by livestock.


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