Abstract
This experiment was conducted to determine the optimum level of green tea extract (GTE) in diets without antibiotics and to evaluate its effect on broiler performances. A total of 100 Cob broiler chicks were kept for a period of 5 weeks. Dietary treatments used in this experiment were antibiotic free group (basal diet as a control), GTE 0.5% (basal + GTE 0.5%), GTE 1% (basal + GTE 1%) and GTE 2% (basal + GTE 2%) and antibiotic added group (basal + 0.05% oxytetracycline). GTE supplemented group showed significantly higher body weight and better feed conversion ratio (FCR) than other treatments (P < 0.05) where highest live weight (2034 g/bird) was recorded in broilers group provided with 0.5% GTE. The best FCR (1.58) was observed in the group supplemented with 0.5% GTE. The obtained results also revealed significant (P < 0.05) difference among treatments in the lipid profile parameters (total cholesterol, HDL and triglyceride except LDL). Broilers treated with 0.5% GTE showed lowest total cholesterol (115.0 mg/dl), triglyceride (116.3 mg/dl) and highest HDL (30.75 mg/dl). In conclusion, GTE can be added in the diet @ 0.5% for better growth performances of broiler as an alternative to antibiotic without any negative effect on lipid profile.
 Res. Agric., Livest. Fish.8(1): 157-163, April 2021
Highlights
Antibiotic growth promoters (AGP) are used in poultry production for improving feed utilization, increasing general health of chickens and subsequently improving their productive performance through different modes of action (Attia et al, 2011), excessive use of antibiotic had negative effects on environment and human health (Al-Harithi, 2002)
The treatments consisted of a control, diets supplemented with three levels (0.5%, 1.0% and 2.0%) of green tea extract (GTE) and antibiotic (0.05% Oxytetracycline) that was denoted as T0, T1, T2, T3 and T4 respectively
The heaviest BW and the best feed conversion ratio (FCR) were observed in broilers fed on diets supplemented with 0.5% and 1.0% of GTE, respectively
Summary
Antibiotic growth promoters (AGP) are used in poultry production for improving feed utilization, increasing general health of chickens and subsequently improving their productive performance through different modes of action (Attia et al, 2011), excessive use of antibiotic had negative effects on environment and human health (Al-Harithi, 2002). Green tea is a promising plants which are reported to have antioxidant (Molan et al, 2009; Sahin et al, 2010) and antimicrobial (Erener et al, 2011; Khan, 2014) activities due to the presence of polyphenols (Gramza et al, 2005; Khan, 2014). The most abundant constituent of green tea extracts (GTE) is catechins which has antibacterial activities (Cao et al, 2005; Hara-Kudo, 2005), as well as antitumorigenic, anti-inflammatory, antiproliferative, antiviral, anti-parasitic and antioxidative properties (Crespy and Williamson, 2004). Studies comparing the effects of green tea extract (GTE) and antibiotics on broiler performance are limited. The present study tested the hypothesis that GTE and antibiotics may differently influence the growth and serum lipid profile of broiler chickens
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