The effect of photoperiod length on performance parameters, carcass characteristics and heterophil/Lymphocyte-ratio in broilers

Bu çalışma, farklı fotoperiyotların [Sürekli Aydınlatma (24L:0D): 24 saat aydınlık:0 saat karanlık; Sabit Aydınlatma (16L:8D): 16 saat aydınlık, 8 saat karanlık; Self-fotoperiyot (SP): 24 saat aydınlık: istediği kadar karanlık] 42. güne kadar besi uygulanan etlik piliçlerin performans, karkas özellikleri ve heterofil/lenfosit oranları üzerine etkisini belirlemek için yapılmıştır. Bir günlük yaşta toplam 180 adet Ross 308 erkek civcivlere 24L:0D, 16L:8D ve SP şeklinde aydınlatma programı uygulanmıştır. Self-fotoperiyot grubunda bulunan piliçlerin karanlık bölmelerde zaman geçirenlerin oranı denemenin başından sonuna kadar artış göstermiştir. Denemenin ikinci haftasından deneme sonuna kadar 24L:0D ve self- fotoperiyot gruplarında bulunanların canlı ağırlıkları 16L8D grubunda olanlardan daha yüksek bulunmuştur (P0.05). Ölüm oranları ve karkas parçaları bakımından da farklılık bulunmamıştır (P>0.05). Heterofil/Lenfosit (H/L) oranı self-fotoperiyot ve 16L:8D gruplarında benzer ve 24L:0D grubuna oranla daha düşük bulunmuştur. Sonuç olarak, broylerlere, kendi fotoperiyod dönemlerini ayarlama imkanı verildiğinde, ticari ışıklandırma şartlarında yetiştirilenler ile eşit vücut ağırlığına ulaştıkları, ancak daha az stresli oldukları belirlenmiştir.

Broilerlerde fotoperyod uzunluğunun performans parametreleri, Karkas özellikleri ve heterofil/lenfosit oranı üzerine etkisi

This study was conducted to assess the efects of photoperiod length [Continuous lighting (24L:0D): 24 Lightness:0 Darkness; Constant lighting (16L:8D): 16 Lightness:8 Darkness; Self-photoperiod (SP): 24 Lightness: free choice Darkness] on the performance, carcass characteristics and heterophil/lymphocyte ratio of male broilers grown to 42 d of age. A total of 180 Ross 308 males were exposed to one of the three lighting programmes: 16L:8D; 24L:0D and SP. In the self-photoperiod group, the percentage of animals that preferred to use the dark chamber, progressively increased throughout the trial. Starting from the 2 nd week till the end of the trial, the live weights of the animals included in the 24L:0D and self-photoperiod groups were higher than those included in the 16L:8D group (P<0.01). The trial groups did not difer from each other for the end-trial feed consumption and feed conversion rates (P>0.05). No diference was detected between the groups for mortality rates or carcass percentages (P>0.05). The heterophil/lymphocyte ratios (H/L) were similar in the self-photoperiod and 16L:8D groups and were lower than those of the 24L:0D group. In conclusion; when the broilers allowed to regulate their own photoperiod, they had similar body weights but lower stress level than those kept under commercial lighting system.

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