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Utilization of grape seeds in ruminant nutrition: effects of this by-product on health conditions, milk production and quality, and ruminal metabolism in Sarda dairy sheep

Correddu, Fabio (2015) Utilization of grape seeds in ruminant nutrition: effects of this by-product on health conditions, milk production and quality, and ruminal metabolism in Sarda dairy sheep. Doctoral Thesis.

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Abstract

Grape seed is a by-product derived from winery and distillery industries, containing relevant concentrations of polyphenolic compounds. The use of this by-product in ruminant nutrition had not been evaluated yet. The present work studied the effects of dietary inclusion of grape seed, alone or in combination with linseed, as source of PUFA, on immune response, liver and kidney metabolic activity, ruminal metabolism, and milk yield, composition, fatty acid profile and oxidation stability in Sarda dairy sheep. It was demonstrated that grape seed and linseed can be included, alone or in combination, in dairy ewes diet without adverse effects on milk production traits and health status; in addition, an immunomodulatory effect of this residue was evidenced. Grape seed was not effective in reducing PUFA ruminal biohydrogenation; however, it increased the ruminal accumulation of CLA cis-9, trans-11 when used alone, and of vaccenic acid when combined with linseed, manly due to its high content in linoleic acid. Milk quality was improved, in term of FA composition, by the inclusion of grape seed and linseed, especially when used in combination. Moreover, dietary grape seed improved oxidative stability of milk, by reducing the accumulation and formation of lipid hydroperoxides and volatile secondary lipid oxidation products, i.e., hexanal and benzaldehyde, after light exposure. In conclusion, the inclusion of grape seeds in the diet of dairy ewes is an alternative use of this by-product.

Item Type:Doctoral Thesis
ID Code:10443
Contributors:Nudda, Anna
Publisher:Università degli studi di Sassari
Uncontrolled Keywords:Grape seed, by-product, linseed, polyphenols, milk
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/19 Zootecnica speciale
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Cicli, scuole e corsi:Ciclo 27 > Scienze e Biotecnologie dei sistemi agrari e forestali e delle produzioni alimentari > Scienze e Tecnologie zootecniche
Deposited On:17 Mar 2015 14:49

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