Effect of previous exposure of sheep to monoterpene odors on intake of alfalfa pellets treated with camphor or alpha-pinene

TitleEffect of previous exposure of sheep to monoterpene odors on intake of alfalfa pellets treated with camphor or alpha-pinene
Publication TypeConference Paper
Year of Publication2003
AuthorsEstell RE, Fredrickson E.L., Anderson D.M., Havstad K, Remmenga M.D.
Conference NameJoint Annual Meeting of the American Dairy Science Association, the American Society of Animal Science, and the Mexican Association of Animal Production
Date PublishedJune 22-26, 2003
Conference LocationPhoenix, AZ
ARIS Log Number151564
AbstractLambs were exposed to aromas of two monoterpenes that had previously been found to decrease intake to determine if exposure during feeding modified effects of these terpenes on subsequent intake. Two experiments were conducted using a split-plot design. Thirty-six ewe lambs (mean BW = 23.1 and 42.2 kg in Exp. 1 and 2, respectively) were group-fed alfalfa pellets (4% of BW, DM basis) in enclosed portable buildings (3.0 x 3.7 m) for 2 h each morning for 56 d. Nine lambs were randomly assigned to each of four buildings, and the appropriate chemical (25 g of camphor in Exp. 1 or 50 ml of alpha-pinene in Exp. 2) was placed in a mesh-covered container in the center of the feeder in two buildings immediately before feeding (two buildings served as controls). After the 8-wk exposure period, lambs were individually fed alfalfa pellets (640 g, DM basis) for 20 min each morning for 10 d (5-d adaptation, 5-d intake measurement) in a metabolism building. Treatments were sprayed on alfalfa pellets at levels representing the concentration of that chemical in Flourensia cernua or at 10-fold that concentration. Controls received ethanol carrier only. Lambs were fed in three groups (n = 12), stratified such that one lamb from each building was placed on each treatment in each group. Lambs were housed as one group and fed alfalfa pellets at 5% of BW (DM basis) except during the 20-min tests. No day effect was detected for intake with either chemical (P> 0.05); therefore, data for collection periods were pooled across day. Exposure to the volatile aroma for 8 wk had no effect on intake during the 10-d interval for either monoterpene (P> 0.05). Moreover, intake during the 10-d interval was not affected by treatment concentration (P> 0.05). Neither concentration of the terpene applied to feed nor previous exposure to the volatile aroma from camphor or alpha-pinene altered feed intake under the conditions of this study.