Journal
ANIMAL SCIENCE JOURNAL
Volume 86, Issue 3, Pages 260-269Publisher
WILEY
DOI: 10.1111/asj.12280
Keywords
antioxidant; polyphenols; wethers; winery grape pomace; winery sedimant
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Funding
- Research Projects for Production of Valuable Livestock by Feeding Self-sufficient Forage Crops, Institute of Livestock and Grassland Science, National Agriculture and Food research Organization (NARO), Japan
- Grants-in-Aid for Scientific Research [26520306] Funding Source: KAKEN
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Four wethers were used in a 4x4 Latin square design experiment to evaluate the availability of two types of winery wastes, winery sediment and grape pomace, as ruminant feeds possessing antioxidant activities. Each wether was assigned to one of the following four treatments: (i) 75g/kg winery sediment (WS) on a dry matter (DM) basis; (ii) 166g/kg DM winery grape pomace (WP); (iii) control diet (CD; 17g/kg DM soybean meal);and (iv) only tall fescue hay (TFH; no additive). Winery sediment and grape pomace had high levels of polyphenols and of radical scavenging activities. Feeding with winery sediment and grape pomace did not negatively affect the intake, but it depressed crude protein (CP) digestibility compared with CD (P=0.052 and P<0.01 for WS and WP, respectively). Polyphenols in winery wastes decreased ruminal ammonia production (P=0.089 and P<0.05), likely due to their inhibitive effect on microbial activities in the rumen. The addition of winery sediment and grape pomace decreased urinary 8-hydroxy-2'-deoxyguanosine (8-OHdG; an index of oxidative damages) excretion per day (P<0.05 and P=0.059). The results indicated that winery sediment and grape pomace could alter nitrogen metabolism and/or act as new antioxidants for ruminants.
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