Abstract
ABSTRACT The objective of the study was to examine the effects of an alcoholic liquid olive leaf extract (OLE) obtained from fresh leaves on the growth performance, carcass weight, caecal microflora, and some plasma variables, such as triglycerides, total cholesterol, high-density lipoprotein (HDL), and low-density lipoprotein (LDL) cholesterol in broiler chickens. A total of 375 one-day-old male broilers (Ross 308) were randomly divided into five treatments with five replicate pens (15 birds each) per treatment. The birds were fed either [...]
Highlights
There has been an increasing awareness since 2006 that the secondary metabolites and essential oils obtained from indigenous plants as growth-promoting or antimicrobial agents may have multiple health and nutritional benefits for poultry (Zeng et al, 2015)
The result obtained regarding the chemical components of the olive leaf extract (OLE) used in the present study indicated that OLE contained plant secondary metabolites such as oleuropein, rutin, hydroxytyrosol, vanillin, vanillic acid, caffeic acid, and catechin (Table 2)
The dietary supplementation of OLE had a linear effect on daily body weight gain (BWG), feed intake (FI), and feed conversion ratio (FCR) (P
Summary
There has been an increasing awareness since 2006 that the secondary metabolites (phytogenic products) and essential oils obtained from indigenous plants as growth-promoting or antimicrobial agents may have multiple health and nutritional benefits for poultry (Zeng et al, 2015). Leaves of the olive tree (Olea europaea L., Oleaceae) or its metabolites, such as oleuropein, have antimicrobial properties both in vitro and in vivo. OLE has been found to act effectively on the microbial load of raw peeled undeveined shrimp (Ahmed et al, 2014) and against pathogenic caecal bacteria in broiler chickens (Jabri et al, 2017). Oleuropein can potentially be implemented as an interesting feed additive; its efficacy, mode of action, and antimicrobial capability as a growth promoter need to be evaluated. Active secondary metabolites of olive leaves could, be considered as an alternative for modulating or altering the intestinal microbial population as well as for promoting growth and dressing percentage. There is no information about whether oleuropein has a protective effect on health in poultry
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