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    Polyethylene glycol affects goats' feeding behavior in a tannin-rich environment

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    Author
    Landau, S. Y.
    Perevolotsky, A.
    Kababya, D.
    Silanikove, N.
    Nitzan, R.
    Baram, H.
    Provenza, F. D.
    Issue Date
    2002-11-01
    Keywords
    Ephedra
    dosage
    physical activity
    feed additives
    concentrates
    polyethylene glycol
    Ceratonia siliqua
    Pistacia lentiscus
    proanthocyanidins
    self administration
    ephedra foemina
    alfalfa
    alfalfa hay
    Israel
    browse plants
    liveweight gain
    body weight
    tannins
    hay
    feed supplements
    goats
    browsing
    feed intake
    feeding preferences
    Mediterranean browse
    self-regulation
    nutrition
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    Citation
    Landau, S. Y., Perevolotsky, A., Kababya, D., Silanikove, N., Nitzan, R., Baram, H., & Provenza, F. D. (2002). Polyethylene glycol affects goats' feeding behavior in a tannin-rich environment. Journal of Range Management, 55(6), 598-603.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643704
    DOI
    10.2307/4004003
    10.2458/azu_jrm_v55i6_landau
    Additional Links
    https://rangelands.org/
    Abstract
    High concentrations of condensed tannins in browse impair brush clearing by goats. We studied the effect of polyethylene glycol (PEG, MW 4000), a polymer that binds condensed tannins, on the feeding behavior of Damascus goats (Capra hircas) on a range dominated by tannin-rich lentisk (Pistacia lentiscus L.). This was done with or without a nutritious alternative to browse (alfalfa hay) available at pasture. In phase 1, no hay was provided to goats; in phase 2, hay was distributed daily in the field. In both phases, 6 goats had free access to PEG while at pasture, while 6 goats that grazed separately on another paddock did not. All goats received each night an allowance of concentrate (400 g day-1 of 40% ground corn grain, 40% ground barley, 17% soybean meal and 3% of a mineral-vitamin premix, and contained as fed 16% crude protein (CP) and 2.66 Mcal kg-1 of Metabolizable Energy). The 2 groups of goats alternated daily between paddocks. Goats supplemented with PEG spent more time browsing lentisk than goats in the control group (73 and 41%, respectively, P < 0.0001). Goats in the control group spent more time foraging on dry grasses than their PEG-fed counterparts (28 and 12%, respectively, P < 0.0001). Goats from the PEG group gained body weight at a higher rate than controls. The daily intake of PEG was 450 g, with an intake rate of 1.2 g sec-1. Supplemental alfalfa hay substituted partly for dry grasses in goats' diets, but did not modify the percent of time goats in either treatment spent browsing lentisk. Our data suggest that PEG has the potential to increase intake of tannin-rich species, even where alternative fodder of better nutritional quality is present. However, self-feeding of PEG may not be the best way to provide PEG because goats may ingest more PEG than needed to annul the aversive effects of tannins on food intake.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4004003
    Scopus Count
    Collections
    Journal of Range Management, Volume 55, Number 6 (November 2002)

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