title: Evaluation of grape pomace from red wine by-product as feed for sheep.
abstract: BACKGROUND
  This work aimed to study the chemical composition and in vitro digestibility of seeds and pulp from grape pomace. In sacco degradability, ruminal fermentation of grape pomace fractions and plasma lipid peroxidation were also studied in sheep fed with or without grape pomace.
  
  
  RESULTS
  Seed and pulp fractions of grape pomace had different values for cell walls (523 vs 243 g kg-1dry matter (DM)), crude protein (CP, 104 vs 138 g kg-1DM), ether extract (EE, 99.0 vs 31.7 g kg-1DM), polyunsaturated fatty acids (PUFA, 69.6 vs 53.3%) and extractable polyphenols (55.0 vs 32.1 g kg-1DM). The in vitro true digestibility, DM in sacco degradability and CP degradability of seeds and pulp were also different (0.51 vs 0.82, 0.30 vs 0.45 and 0.66 vs 0.39 respectively). The ammonia-N concentration and total volatile fatty acids (VFA) in ruminal liquid were significantly lower and plasma lipid peroxidation was also numerically lower in sheep that consumed grape pomace.
  
  
  CONCLUSIONS
  The nutritive value of grape pomace varies depending on the proportion of seeds and pulp. The interest of this by-product in sheep feeding could be related to its polyphenol and PUFA content, which could improve meat and milk quality. © 2016 Society of Chemical Industry.
authors: ETS Ingenierías Agrarias, Universidad de Valladolid, E-34004, Palencia, Spain.
authors: Cristina
authors: C
authors: Guerra-Rivas
authors: ETS Ingenierías Agrarias, Universidad de Valladolid, E-34004, Palencia, Spain.
authors: Beatriz
authors: B
authors: Gallardo
authors: Instituto de Ganadería de Montaña (CSIC-ULE), E-24346 Grulleros, León, Spain.
authors: Ángel R
authors: ÁR
authors: Mantecón
authors: ETS Ingenierías Agrarias, Universidad de Valladolid, E-34004, Palencia, Spain.
authors: María
authors: M
authors: Del Álamo-Sanza
authors: ETS Ingenierías Agrarias, Universidad de Valladolid, E-34004, Palencia, Spain.
authors: Teresa
authors: T
authors: Manso
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D004063:Digestion; D008892:Milk / Q000737:chemistry / Q000378:metabolism; D009753:Nutritive Value; D012417:Rumen / Q000378:metabolism; D012756:Sheep / Q000378:metabolism*; D034561:Sheep, Domestic / Q000378:metabolism; D027843:Vitis / Q000737:chemistry* / Q000378:metabolism; D014866:Waste Products / Q000032:analysis*; D014920:Wine / Q000032:analysis
chemical_list: D014866:Waste Products
keywords: grape pomace; nutritive value; phenolic compounds; ruminal degradation; sheep