Etlik Piliçlerde Kısıtlı Yemlemenin Performans Özelliklerine Etkisi

Telli, Abdurrahman; Alarslan, Ö. Faruk; Altinsaat, Çiğdem; Maheri-Sis, Naser; Nazhad, Keyvan Hatefi; Ahmadzadeh, Arman

doi:10.9775/kvfd.2011.5388

Cited by 1 publication

(1 citation statement)

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“…As a result of the long-term genetic improvement studies, the performance of broiler chickens has reached the current position (Baéza et al, 2012;Shaddel Telli et al, 2012). However, this development has led to an increase in sensitivity of the broilers to environmental factors, and has led to the weakening of their adaptability to adverse conditions (Uni and Yahav, 2010).…”

Section: Introductionmentioning

confidence: 99%

Effects of thermal manipulations during embryogenesis of broiler chickens on developmental stability, hatchability and chick quality

Narinç

Erdoğan

Tahtabiçen³

et al. 2016

Animal

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Stress based on high temperature and humidity reduces the production performance of fast-growing broilers and causes high mortality. Temperatures higher than optimum have been applied to broilers in the embryonic period in order to overcome thermal stress. This study was conducted to investigate the effects of exposure to two long-term high-thermal environments on the developmental stability of embryonic growth, hatchability and chick quality. For this purpose, 600 broiler eggs were incubated. Treatments consisted of eggs incubated at 37.8°C at 55% relative humidity throughout (control), heated to 39.6°C at 60% relative humidity for 6 h daily from 0 to 8th day, and heated to 39.6°C at 60% relative humidity for 6 h daily from the 10 to 18th day. Embryo weights and lengths of face, wing, femur, tibia and metatarsus were measured daily between the 10th and 21st day of the experiment. Daily relative asymmetry values of bilateral traits were estimated. The hatchability, the weight of the 1-day-old chicks and chick quality were determined. In conclusion, no negative effects of the treatments of the long-term high-thermal environment in the early and late stages of incubation for epigenetic adaptation were determined on the embryo morphology, development stability and weight of the chick. Moreover, regressed hatchability of embryos that were exposed to a long-term high-thermal environment was detected. Especially between the 10 and 18th day, the thermal manipulation considerably reduced the quality of the chicks. Acclimation treatments of high temperature on the eggs from cross-breeding flocks should not be made long term; instead, short-term treatments should be made by determining the stage that generates epigenetic adaptation.Keywords: epigenetic adaptation, heat stress, broiler, relative asymmetry, chick quality ImplicationsThe current study was performed to determine the effects of thermal manipulation on the developmental stability of the embryo, hatchability and chick quality. Negative effects of treatments of a long-term high-thermal environment in incubation were not determined on the embryo characteristics, but this treatment negatively affected both hatchability and chick quality. IntroductionAs a result of the long-term genetic improvement studies, the performance of broiler chickens has reached the current position (Baéza et al., 2012;Shaddel Telli et al., 2012). However, this development has led to an increase in sensitivity of the broilers to environmental factors, and has led to the weakening of their adaptability to adverse conditions (Uni and Yahav, 2010). The main environmental factors that cause loss of productivity and high mortality rates in poultry is heat stress, which is caused by high environmental temperature and humidity (Terim Kapakin et al., 2013). The feed consumption decreases in birds that are exposed to heat stress, and yield losses are experienced accordingly (Yalçin et al., 1997). In order to fight against heat stress, resistant genotypes should be developed through breeding, or the ...

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Section: Introductionmentioning

confidence: 99%