The effects of thyme essential oil and vitamin combinations on performance, carcass quality and oxidation parameters in broilers exposed to heat stress
- 1 September 2020
- journal article
- research article
- Published by Veterinary Journal of Ankara University in Ankara Üniversitesi Veteriner Fakültesi Dergisi
- Vol. 67 (4), 357-364
- https://doi.org/10.33988/auvfd.626707
Abstract
En tr This study aims to determine the effect of essential thyme oil (ETO) and a combination of ETO with different vitamins (A, C and E) on performance, carcass quality, oxidation parameters in broilers exposed to heat stress (HS). A total of 300, 21 days old, male Ross-308 chicks were distributed in six experimental groups with five replicates. The broilers in HS groups were exposed to 34oC for nine hours per day between 21 and 41 days of the experiment. The experimental groups were as follows: 1: Thermoneutral control (TNC, 22oC), 2: Heat stress control (HSC, 34oC), 3: ETO 300 mg/kg ETO, 34oC), 4: ETO + Vit C (300 mg/kg ETO + 250 mg/kg Vit C, 34oC), 5: ETO + Vit E (300 mg / kg ETO + 250 mg/kg Vit E, 34oC) and 6: ETO + Vit A (300 mg / kg ETO + 15000 IU / kg Vit A, 34°C). As a result, it was determined that HS significantly reduced live weight (LW), live weight gain (LWG), and feed intake (FI) values compared to the TNC group (PoC sıcaklığa maruz bırakıldı. Deneme grupları: 1: Termonötral pozitif kontrol (TNK, bazal yem, 22 oC), 2: Isı stresi kontrol (ISK, bazal yem, 34 oC), 3: KEY (bazal yem+300 mg/kg KEY, 34 oC), 4: KEY+Vit-C (bazal yem+300 mg/kg KEY+250 mg/kg vitamin C, 34 oC), 5: KEY+Vit-E (bazal yem+300 mg/kg KEY+250 mg/kg vitamin E, 34 oC) ve 6: KEY+Vit-A (bazal yem+ 300 mg/kg KEY+15000 IU/kg vitamin A, 34 oC) şeklinde oluşturuldu. Çalışma sonunda (41. gün) ısı stresinin canlı ağırlık (CA), toplam canlı ağırlık artışı (CAA) ve yem alımı (YA) değerlerini TNK grubuna göre önemli derecede azalttığı (P<0.05) belirlendi. Isı stresine maruz bırakılan broylerlerin yemlerine kekik yağı veya kekik yağının vitaminlerle (A, C, E) birlikte katılması performans, karkas kalitesi ve organ ağırlıkları ile serum parametrelerine etkisi önemli bulunmadı. Ancak KEY+Vit C ilavesi çalışmanın ilk yarısında (21-31 günlük) GCAA’ını, KEY+Vit E ilavesi ise çalışmanın ilk yarısında GCAA’ını ve çalışma sonunda toplam yem tüketimini olumlu etkiledi. Ekonomik olarak en yüksek karlılık TNK grubunda elde edilirken, en düşük karlılık ise KEY+Vit A grubunda elde edilmiştir. Sonuç olarak, ısı stresinin broiler piliçlerin performans değerlerini olumsuz etkilediği, rasyona KEY+Vit C ve KEY+Vit E ilavesinin ısı stresinin olumsuz etkisinin minimize edilmesinde katkı sağlayabileceği kanaatine varılmıştır.Keywords
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