Whole exhausted berries of Myrtus communis L. supplied to dairy ewes: Effects on milk production traits and blood metabolites

Supplementation of by‐products from grape, tomato and myrtle affects antioxidant status of dairy ewes and milk fatty acid profile

“…However, the MDA (mg/kg of by‐product) content was found to be highest in TP probably explained by their sun dried for half‐day before to complete the drying in air oven at 45°C for 12 hr. The TP and GM by‐products were characterized by a similar proportion of PUFA, whereas EMB exhibited the highest content, due to the very high proportion of linoleic acid (Table ) in agreement with previous reports (Nudda et al, ). However, the PUFA intake of ewes supplemented with EMB was similar to the values obtained in the other groups.…”

“…Regarding the feeds, FAs were extracted and analysed as described by Correddu, Gaspa, Pulina, and Nudda (2016), with the gas chromatograph Agilent and a CP-Sil88-fused silica capillary column SP™-2560 (100 m × 0.25 mm ID, 0.20-μm film; Supelco). The concentration of total polyphenols in the by-products was determined by the Folin-Ciocalteu method as described by Kim, Chun, Kim, Moon, and Lee (2003), here modified on purpose as detailed by Nudda et al (2017). Fatty acid oxidation of by-products was assessed by the determination of secondary products of fatty acid oxidation as 2-thiobarbituric acid reactive substances (TBARS), using a modification of the aqueous acid-extraction method described by Raharjo, Sofos, and Schmidt (1992) with some modification (Nudda, Battacone, Boe, et al, 2013b).…”

“…Some agro‐industrial by‐products are reported to be a suitable source of bioactive compound, and their inclusion in ruminant diets could decrease their expensive management and disposal and permit the recovery of beneficial compounds. Tomato pomace (TP) is the by‐product derived from process of tomato juice (Peiretti, Gai, Rotolo, Brugiapaglia, & Gasco, ); grape marc (GM) derived from winemaking (Manso et al, ); and exhausted myrtle berries (EMBs) derived from production of liqueur called "mirto rosso" (red myrtle) (Nudda et al, ). GM, TP and EMB contain natural antioxidant compounds such as polyphenols (Abbeddou, Rischkowsky, Richter, Hess, & Kreuzer, ; Correddu et al, ; Guerra‐Rivas et al, ), and lycopene as in TP (Shao et al, ).…”

Can Agro-Industrial By-Products Rich in Polyphenols be Advantageously Used in the Feeding and Nutrition of Dairy Small Ruminants?

“…The inclusion of BPRP in the diets of small ruminant seems to decrease voluntary feed intake in sheep but not in goats. In particular, a negative relationship has been observed between the amount of total phenols contained in BPRP (expressed in g/kg DM) and DMI (expressed in kg/d) only in sheep (y = 22.872x + 47.765; R 2 = 0.8118) [16,[88][89][90][91], as reported in Figure 2. In contrast, in goats, this association was not observed (y = −1.2727x + 18.586 R 2 = 0.0003; Figure 2) [40,[92][93][94].…”

“…Moreover, differences among grape by-products can also be due to the cultivar, stage of ripening, and agro-climatic conditions. The exhausted myrtle berries, collected in two different liquor factories, varied in lipid content from 54 to 110 g/kg of DM [16,17]. Table 1.…”