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Effects of feeding polyphenol‐rich winery wastes on digestibility, nitrogen utilization, ruminal fermentation, antioxidant status and oxidative stress in wethers
Author(s) -
Ishida Kyohei,
Kishi Yosuke,
Oishi Kazato,
Hirooka Hiroyuki,
Kumagai Hajime
Publication year - 2015
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.12280
Subject(s) - winery , pomace , chemistry , food science , polyphenol , dry matter , antioxidant , zoology , biology , biochemistry , wine
Four wethers were used in a 4 × 4 L atin 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) 75 g/kg winery sediment ( WS ) on a dry matter ( DM ) basis; (ii) 166 g/kg DM winery grape pomace ( WP ); (iii) control diet ( CD ; 17 g/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.