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Journal of Animal Science, Vol 76, Issue 1 228-233, Copyright © 1998 by American Society of Animal Science

JOURNAL ARTICLE

Effects of volatile compounds on consumption of alfalfa pellets by sheep

R. E. Estell, E. L. Fredrickson, M. R. Tellez, K. M. Havstad, W. L. Shupe, D. M. Anderson and M. D. Remmenga
USDA/ARS Jornada Experimental Range, Las Cruces, NM 88003-0003, USA.

We examined the effects of six volatile compounds on alfalfa pellet consumption by lambs. In each experiment, 45 lambs were individually fed alfalfa pellets sprayed with a selected compound (camphor, limonene, cis-jasmone, beta-caryophyllene, borneol, or alpha-pinene) at one of five concentrations. Treatment concentrations were multiples (0, .5, 1, 2, and 10) of the concentration of a specific compound (X) that was related to differential herbivory of tarbush by livestock in previous studies. Treatments were applied to alfalfa pellets (.64 kg x lamb(-1) x d(-1), DM basis), and consumption was measured during a 20-min interval each morning for 5 d. Lambs were adapted to handling procedures and the pelleted diet (without treatments) for 10 d. Lambs were maintained and fed (approximately 4.5 to 5% of BW) as one group except during 20-min tests. A negative linear effect of treatment concentration on intake was observed for camphor (P < .02) and alpha-pinene (P < .01), and a quadratic response was detected for borneol (P < .02). The other three compounds had no discernible effect on consumption. Although volatile compounds generally had only minor influences on consumption, the negative influences of alpha-pinene and camphor concentrations on pellet consumption suggest that these monoterpenes may partially explain differential herbivory of individual tarbush plants by livestock.


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Copyright © 1998 by the American Society of Animal Science.