The physiological effects of monoterpenes on Spanish and Angora goats /
Goats used for brush control tend to self limit juniper at thirty percent of the diet or less. Previous studies of free consumption by Angora and Spanish goats of Juniperus spp. have reported maximum intake values as 33.5% (6.7 g/kg bw) of diet composition (Pritz et al. 1997). In order to increase j...
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
2000.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=727853421&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Goats used for brush control tend to self limit juniper at thirty percent of the diet or less. Previous studies of free consumption by Angora and Spanish goats of Juniperus spp. have reported maximum intake values as 33.5% (6.7 g/kg bw) of diet composition (Pritz et al. 1997). In order to increase juniper consumption and improve brush control strategies, the post-ingestive effects of juniper oil on goats needed to be investigated. Part I of this study addressed whether adding essential oil distilled from redberry juniper (Juniperus pinchotti) inhibited in vitro fermentation. There was no effect (P>.05) on in vitro fermentation of an alfalfa substrate. Secondly, this study addressed whether dosing goats with juniper caused a pre-conditioning effect. There was a profound difference in volatile fatty acid (VFA) levels in pre- vs. post in vitro tubes after feeding goats redberry juniper leaves for 10 days. VFA levels increased following dosing goats with redberry juniper at 30% of their diet indicating a slight pre-conditioning effect. When goats were dosed with 40%, 50%, and 60% redberry juniper VFA levels declined. There was no consistent difference in dry matter digestion (DMD) levels. Acetate:propionate ratios indicate an alteration in microbial species. Part II of the study investigated what physiological or toxic effect essential oil distilled from redberry juniper would have on Spanish and Angora goats. Ruminal dosing with juniper oil for nine days with 0.18g oil/kg BW resulted in cachexia and mild hepatic lipid vacuolization. At higher dose levels, some hepatocellular necrosis and lobular encapsulation were evident. Body weight declined in Angora (P=.0015) and Spanish (P=.0004) goats during the dosing period as a result of a decline in consumption of the basal feed ration. AST levels rose (P=0.0293) in Spanish goats after nine days of dosing at the higher dose level and serum glucose levels decreased in all goats (P<.05), providing evidence of a catabolic state. In summary, post-ingestive effects of juniper oil consumption by goats at levels above 30% of the diet were alteration of normal microbial function, and inducement of a cachectic and catabolic state. |
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| Item Description: | Vita. "Major Subject: Toxicology". |
| Physical Description: | xiv, 170 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 67-82). |