title: Effects of four mono- and sesquiterpenes on the consumption of alfalfa pellets by sheep.
abstract: Effects of individual terpenes on alfalfa pellet intake by lambs were examined in four experiments. Forty-five lambs (nine lambs/treatment) were individually fed alfalfa pellets sprayed with either camphene, myrcene, caryophyllene oxide, or beta-pinene at one of five concentrations (one terpene per experiment). Treatments (0, 0.5, 1, 2, and 10x) were multiples of the concentration (x) of a specific terpene in tarbush. Terpenes were applied to alfalfa pellets (0.64 kg x lamb(-1) x d(-1), DM basis), and consumption was measured during a 20-min interval for 5 d. Lambs 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). Camphene and caryophyllene oxide tended to decrease intake (linear contrasts were P = .0651 and P = .0504, respectively), whereas myrcene and beta-pinene exerted no effect on the consumption of alfalfa pellets by lambs. Camphene and caryophyllene oxide may be involved in the differential herbivory of individual tarbush plants by livestock.
authors.affiliation: USDA/ARS Jornada Experimental Range, Las Cruces, NM 88003-8003, USA. restell@nmsu.edu
authors.forename: R E
authors.initials: RE
authors.lastname: Estell
authors.forename: E L
authors.initials: EL
authors.lastname: Fredrickson
authors.forename: D M
authors.initials: DM
authors.lastname: Anderson
authors.forename: K M
authors.initials: KM
authors.lastname: Havstad
authors.forename: M D
authors.initials: MD
authors.lastname: Remmenga
mesh_terms: D000821:Animal Feed; D000818:Animals; D000081008:Bicyclic Monoterpenes; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects; D002149:Energy Intake / Q000187:drug effects*; D005247:Feeding Behavior / Q000187:drug effects; D005260:Female; D000455:Medicago sativa; D012717:Sesquiterpenes / Q000008:administration & dosage / Q000494:pharmacology; D012756:Sheep / Q000378:metabolism*; D013729:Terpenes / Q000008:administration & dosage / Q000494:pharmacology*
chemical_list: D000081008:Bicyclic Monoterpenes; D012717:Sesquiterpenes; D013729:Terpenes; C019286:camphene