Effect of Some Stresses on Physiological Response of Leghorn Broiler Chickens

Abstract

study were carried out in poultry production unit (college of science and Technology of animal production) during June, 2017 to investigate the effects of heat stress, hungry stress, overcrowding stress and thirst stress on physiological responses in Leg horn broilers chicken. Two hundred and fifty, one-day-old male, broiler chicks were used in this study, The chickens were randomly divided into five treatment groups for 30days fifty of each to investigate the effect of heat stress, hungry, overcrowding and thirst. The last fifth saved as a control group. The birds were fed on per starter and starter diet, 2 ml of blood were taken from the heart in EDTA anticoagulant container ,Standard method was used to measure hematological parameters such as:(PCV, Hb, ESR, TWBCs and TRBC s) and body weight .All the values were calculated as the mean± standard deviation while the difference between the means was compared by an independent student’s test using statistical package for social science (SPSS version 16). The results indicated that heat stress group had significantly (P≥ 0.01) lower PCVand BW and significantly(P≥ 0.05) lower Hb concentrations, TLC compared to the control group in chickens. Hungry stress in chickens indicated significantly(P≥ 0.01) lower PCV,Hb concentration, TRBC and BW and higher TLC compared to control group. Overcrowding stress in chickens indicated numorous decrease in PCV and Hb concentration ,TRBC, TLC. But BW values decrease significantly (P≥ 0.05) in overcrowding chicken. The thirst stress chickens had higher PCV, Hb concentration, TRBC, TLC (P≥ 0.05) and lower BW values(P≥ 0.05) compared to control group. Further research is required to fully understand interaction between food restriction, body weight, health and fertility. And determine when and how much food restriction