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Use of n-alkanes to estimate seasonal diet composition and intake of sheep and goats grazing in California chaparral
Year:
2012
Source of publication :
Small Ruminant Research
Authors :
Brosh, Arieh
;
.
Volume :
104
Co-Authors:
Narvaez, N., Department of Animal Science, University of California, Davis, CA 95616, United States
Brosh, A., Newe Ya'ar Research Center, Institute of Animal Science, P.O. Box 1021, Ramat Yishay 30095, Israel
Pittroff, W., Department of Animal Science, University of California, Davis, CA 95616, United States
Facilitators :
From page:
129
To page:
138
(
Total pages:
10
)
Abstract:
Small ruminants are increasingly used in prescribed grazing to reduce biomass in wildfire-prone plant associations. The objective of the study was to determine intake, botanical composition of intake, and nutritional quality of diets of sheep and goats browsing California chaparral during fall, spring and summer.Woody plants constituted 93.3%, 87.0%, and 88.8% of the diet of goats, and 93.7%, 67.1%, and 82.7% of the diet of sheep in fall, spring and summer, respectively. Sheep preferred herbaceous vegetation when available. For browse, sheep preferred oak species in fall, whereas in summer they preferred Adenostoma fasciculatum (chamise). Goats exhibited a similar species preference ranking, but with significant differences in proportions. Seasonal variations in intake proportions only partially reflected differences in nutritional quality. It is likely that seasonal variation in secondary compound concentration as well as available choice, in particular available herbaceous biomass, are important factors driving intake and diet composition. Organic matter digestibility of the consumed diets varied from 55.8% in fall to 61.9% in spring for goats and from 44.1% in fall to 56.8% in spring for sheep. Daily DM intake (gkgBW -0.75) was lowest (P<0.05) in summer for goats and sheep but highest (P<0.05) in fall for goats and in spring for sheep. Crude protein (gkgBW -0.75) and ME (MJkgBW -0.75) intakes were lowest (P<0.05) in fall for goats and in summer for sheep but highest (P<0.01) in spring for goats and sheep. All animals lost weight throughout all seasons but sheep lost relatively more weight (P<0.05) than goats. Under the conditions of this study, the nutritional quality of the selected diet did not suffice to maintain body condition. Goats fare relatively better under conditions of low availability of herbaceous biomass. However, adequate supplementation programs must be designed to employ small ruminants for the reduction of flammable biomass in California chaparral. © 2011 Elsevier B.V.
Note:
Related Files :
Adenostoma fasciculatum
Animalia
Bovidae
Browse
Capra hircus
Diet composition
Digestibility
Feed intake
Fire fuel reduction
Ovis aries
Show More
Related Content
More details
DOI :
10.1016/j.smallrumres.2011.10.002
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
30619
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:56
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Scientific Publication
Use of n-alkanes to estimate seasonal diet composition and intake of sheep and goats grazing in California chaparral
104
Narvaez, N., Department of Animal Science, University of California, Davis, CA 95616, United States
Brosh, A., Newe Ya'ar Research Center, Institute of Animal Science, P.O. Box 1021, Ramat Yishay 30095, Israel
Pittroff, W., Department of Animal Science, University of California, Davis, CA 95616, United States
Use of n-alkanes to estimate seasonal diet composition and intake of sheep and goats grazing in California chaparral
Small ruminants are increasingly used in prescribed grazing to reduce biomass in wildfire-prone plant associations. The objective of the study was to determine intake, botanical composition of intake, and nutritional quality of diets of sheep and goats browsing California chaparral during fall, spring and summer.Woody plants constituted 93.3%, 87.0%, and 88.8% of the diet of goats, and 93.7%, 67.1%, and 82.7% of the diet of sheep in fall, spring and summer, respectively. Sheep preferred herbaceous vegetation when available. For browse, sheep preferred oak species in fall, whereas in summer they preferred Adenostoma fasciculatum (chamise). Goats exhibited a similar species preference ranking, but with significant differences in proportions. Seasonal variations in intake proportions only partially reflected differences in nutritional quality. It is likely that seasonal variation in secondary compound concentration as well as available choice, in particular available herbaceous biomass, are important factors driving intake and diet composition. Organic matter digestibility of the consumed diets varied from 55.8% in fall to 61.9% in spring for goats and from 44.1% in fall to 56.8% in spring for sheep. Daily DM intake (gkgBW -0.75) was lowest (P<0.05) in summer for goats and sheep but highest (P<0.05) in fall for goats and in spring for sheep. Crude protein (gkgBW -0.75) and ME (MJkgBW -0.75) intakes were lowest (P<0.05) in fall for goats and in summer for sheep but highest (P<0.01) in spring for goats and sheep. All animals lost weight throughout all seasons but sheep lost relatively more weight (P<0.05) than goats. Under the conditions of this study, the nutritional quality of the selected diet did not suffice to maintain body condition. Goats fare relatively better under conditions of low availability of herbaceous biomass. However, adequate supplementation programs must be designed to employ small ruminants for the reduction of flammable biomass in California chaparral. © 2011 Elsevier B.V.
Scientific Publication
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