Polyethylene glycol affects goats' feeding behavior in a tannin-rich environment
Issue Date
2002-11-01Keywords
Ephedradosage
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
Metadata
Show full item recordCitation
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 ManagementJournal
Journal of Range ManagementAdditional 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
textArticle
Language
enISSN
0022-409Xae974a485f413a2113503eed53cd6c53
10.2307/4004003