Etlik Piliçlerde Çevresel Stresin Performans, Karkas Randımanı ve Bazı Kan Parametreleri Üzerine Etkisi

Amaç: Bu çalışmada, etlik piliçlerde çevresel stresin gelişme performansı, karkas randımanı ve bazı fizyolojik parametreler üzerine etkileri incelenmiştir. Materyal ve Metot: Günlük civcivler yüksek sıcaklık, rotasyon, obje kullanımı ve kontrol olmak üzere rastgele 4 deneme grubuna ayrılmıştır. Sıcaklık grubunda civcivler denemenin 21. gününde 3 saat süre ile 38±1 ºC sıcak stresine maruz bırakılmışlardır. Obje grubuna 1-44. günler arasında çevresel zenginleştirme amacıyla bölmelere yerleştirilen renkli objelerle (ayna, pet şişe, top vb.) görsel uyarıda bulunularak stres yaratılmıştır. Rotasyon grubundaki piliçler ise haftada iki kere düzenli olarak bölmeler arası rotasyona tabi tutulmuşlardır. Denemenin 42. gününde de tüm piliçlere 1 saat süre ile 38±1 ºC sıcak stresi uygulanmıştır. Bulgular: Çevresel zenginleştirme uygulaması etlik piliç performansını önemli düzeyde etkilememekle birlikte, 42. gün canlı ağırlığı ve yemden yararlanmayı iyileştirmiştir. Sıcak stresi uygulanan grubun karkas ağırlığı ve karkas randımanı değerlerinin kontrol grubu ile benzerlik gösterdiği saptanmıştır. Akut sıcak stresi sonrasında (21. gün) sıcaklık grubunda trigliserid düzeyinin kontrol grubuna göre önemli düzeyde daha yüksek olduğu görülmüştür. Deneme sonunda (42. gün) ise glukoz ve kolesterol değerleri bakımından deneme grupları arasında önemli farklılıklar oluştuğu belirlenmiştir. Kontrol, obje ve sıcaklık gruplarında kolesterol seviyeleri benzerlik gösterirken, rotasyon grubunda önemli derecede yükseldiği saptanmıştır. Sonuç: Sonuç olarak, erken yaşlardan itibaren zenginleştirilmiş çevrede büyütme strese adaptasyon sağlanması ve refahın iyileştirilmesi amacıyla yararlanılabilecek bir yöntem olarak önerilebilir, ancak uygulamaya aktarılabilmesi için daha fazla çalışma yapılmasına gerek vardır.

Effect of Environmental Stress on Performance, Carcass Yield and Some Blood Parameters in Broilers

Objective: In this study, the effects of environmental stress on growth performance, carcass yield and some blood parameters of broilers were investigated. Material and Methods: Day-old chicks were randomly assigned into four treatment groups (heat stress, rotation, environmental enrichment and control). Chicks in heat stress group were exposed to 38±1 ºC for 3 hours at the age of 21 days. Chicks placed in the enriched environment group were reared in pens that contained a variety of colorful objects (mirror, plastic bottle, ball, etc) between days 1-44. Chicks in the rotation group were subjected to rotation among pens twice a week. All treatment groups were exposed to 38±1 ºC for 1 hour on day 42 of the experiment. Results: Although environmental enrichment did not have a significant effect on the growth performance of broiler chickens, higher live weight day and improved feed conversion ratio on day 42 was noted. In heat stress group, carcass weight and carcass yield were similar to the control group. After exposure to acute heat stress (21st day), triglyceride levels in heat stress group were significantly higher than that of the control group. At the end of the experiment (21st day), there were significant differences between treatment groups in glucose and cholesterol levels. Cholesterol levels were significantly higher in the rotation group, whereas levels were similar in control, environmental enrichment and heat stress groups. Conclusion: In conclusion, rearing in an enrichment environment beginning from early ages can be recommended as a useful method for adaptation to stress and improvement of welfare, but further research is needed to put the method in practice

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Hayvansal Üretim-Cover
  • ISSN: 1301-9597
  • Başlangıç: 1974
  • Yayıncı: EGE ZOOTEKNİ DERNEĞİ