Small amounts of agro-industrial byproducts in dairy ewes diets affects milk production traits and hematological parameters

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

“…Reference values of oxidative biomarkers in Sarda dairy sheep are not yet available. However, the data refer to animals clinically healthy, resulted by clinical inspection and haematological parameters, which were within the physiological range for sheep (Nudda et al, ) before the start of the trial and during the experimental period.…”

“…However, a tendency of ABTS to increase in EMB ewes was observed compared with CON. The EMB has a high polyphenol content (Table ), composed mainly of hydrolysable tannins and, to a lesser extent, of ellagic and gallic acids (3,724, 495 and 386 µg/g of EMB dry matter respectively; Nudda et al, ). Both ellagic acid (Derosa, Maffioli, & Sahebkar, ; Rios Giner, Marín, & Recio, ) and gallic acid (Rajan and Muraleedharan, ) have considerable antioxidant capacity, but probably the amount supplied with EMB may have been partly hydrolysed in the digestive tract (Kumar, Kumar, & Kaur, ; Kawabata, Yoshioka, & Terao, ).…”

“…In fact, the partial passage of MDA from blood to mammary gland may have been counterbalanced by the minor lipid peroxidation for lower PUFA n‐6 concentration in TP milk compared with CON milk. In GM, despite the higher value of PUFA n‐6 compared with CON, lack of MDA variation could be related to protective effect of antioxidant molecules present in these by‐products (Nudda et al, ) that could have reached the mammary gland.…”

“…The animals were handled following the European Union Guidelines on animal care (Directive/2010/63/EU, ). Thirty‐six Sarda selected lactating ewes were allocated into 4 equal groups in a randomized block design as described in detail in the previous paper (Nudda et al, ). The ewes, rented from a large private flock (approximately 700 heads), were moved to the experimental farm of the Dipartimento di Agraria of the University of Sassari.…”

“…In fact, even if the MDA value in TP was low, the intake of peroxidized feeds from animal for so long period could have caused the increased amounts of MDA in blood, as MDA is readily absorbed from the gut into the systemic circulation (Grootveld et al, 1998). Since other studies have shown a decrease in the concentration of MDA in the serum (Sahin et al, 2004), meat (Sahin, Orhan, Tuzcu, Sahin, & Kucuk, 2008) and liver (Sahin et al, 2011) Nudda et al, 2019). Both ellagic acid (Derosa, Maffioli, & Sahebkar, 2016;Rios Giner, Marín, & Recio, 2018) and gallic acid (Rajan and Muraleedharan, 2017) have considerable antioxidant capacity, but probably the amount supplied with EMB may have been partly hydrolysed in the digestive tract (Kumar, Kumar, & Kaur, 2014;Kawabata, Yoshioka, & Terao, 2019).…”