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  • Title: Effect of dietary dried oregano leaves on growth performance, carcase characteristics and serum cholesterol of female early maturing turkeys.
    Author: Bampidis VA, Christodoulou V, Florou-Paneri P, Christaki E, Chatzopoulou PS, Tsiligianni T, Spais AB.
    Journal: Br Poult Sci; 2005 Oct; 46(5):595-601. PubMed ID: 16359114.
    Abstract:
    1. A study was conducted with 120 female early maturing turkeys to test the effect of dietary dried oregano leaves (Origanum vulgare subsp. hirtum) on body weight (BW), feed intake (FI), feed conversion efficiency (FCE), carcase characteristics and serum cholesterol concentration. Dried oregano leaves had a content of 3.6 ml essential oils/100 g, while the carvacrol content was 855 g/kg of the total essential oils. 2. From 1 to 84 d of age, the turkeys were fed on 4 diets varying in oregano content (OR0, no oregano--control; OR45, 1.25 g oregano/kg; OR90, 2.5 g oregano/kg; OR135, 3.75 g oregano/kg). Birds were given feed and water ad libitum. 3. BW was unaffected by oregano throughout the experiment. FI and FCE were similar among all treatments until 42 d of age. From 43 to 84 d of age and for the overall experimental period, FI decreased linearly in treatment OR135 and FCE increased linearly with dietary oregano content. Body and carcase weights, carcase yield, and the relative weights of the heart and liver were not significantly affected by oregano content. The relative weights of the gizzard and small intestine decreased linearly with oregano content. Serum cholesterol content was similar among all treatments. 4. In the present study, dietary oregano (1.25, 2.5 and 3.75 g/kg) improved FCE in female early maturing turkeys between 43 and 84 d, with the lowest oregano inclusion (1.25 g/kg) giving the most cost effective diet. Thus, dried oregano leaves may be used as a natural herbal growth promoter for early maturing turkeys.
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