Original scientific paper
EFFECT OF ACUTE THERMIC STRESS ON IMMUNE RESPONSE TO NEWCASTLE DISEASE AND PRODUCTION OF LIGHT HYBRID LAYING HENS
Milivoj Mikec
; Veterinarski fakultet, Zagreb, Republika Hrvatska
Vladimir Savić
; Veterinarski fakultet, Zagreb, Republika Hrvatska
Perica Pavičić
; Veterinarski fakultet, Zagreb, Republika Hrvatska
Abstract
The effect was studied of acute thermal stresses on immune response and production of light hybrid laying hens aged from 62 to 69 weeks, vaccinated against Newcastle disease. The experimental group was repeatedly exposed to thermal stress of moderate intensity (31 - 32°C), usual for our climate lasting six hours. The control group of hens was kept under optimal thermal conditions (20-23°C). The hens from the control group achieved better laying performance (3.93 eggs more per hen) with less feed sumption than the stressed hens where reaction to live vaccine was delayed approximately seven days.The adaptation to stress in hens from the control group manifested in the second part of the experiment by achieving satisfactorily high Hl titer and laying.
Keywords
Hrčak ID:
162642
URI
Publication date:
19.11.1993.
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