Heat stress and its amelioration with nutritional, buffering, hormonal and physical techniques for New Zealand White rabbits maintained under hot summer conditions of Egypt
1994
Fayez, I. | Marai, M. | Nasr, A.S. (Zagazig University (Egypt). Faculty of Agriculture, Department of Animal Production) | El-Masry, K.A. (Atomic Energy Authority, Cairo (Egypt). Nuclear Research Center, Radiobiology Department)
A total number of 73 growing female New Zealand White (NZW) rabbits with nearly equal average body weight, were used during winter (16.4 to 20.3 degrees C and 74 to 66 R.H.) and summer (34.2 to 38.4 degrees C and 64 to 41 R.H.) seasons to study the growth performance and haemobiochemical profile as affected by summer heat stress conditions of Egypt and their amelioration with various 5 days of techniques. In winter (January and Febrary months), ten animals at 60 18.5 g initial live body weight (LBW), were used. During summer age with 1400 16.92 g (July and August months), sixty three animals at the same age with 1398 LBW were used and divided into 9 groups of 7 each. One of these groups altogether with the winter group were used to study the effect of heat stress on rabbits. The other summer groups were treated with nutritional, buffering, hormonal and physical techniques for amelioration of heat stress of rabbits under hot summer conditions of Egypt. With regard to hemobiochemical levels, most lipid fractions decreased (P lesser than 0.05 with palm oil (5 or 7 per cent), KHCO3 (1.25 or 2.5 per cent), T4 (30 or 50 mg/kg LBW) and cool drinking water (10 degrees C) techniques. Plasm T4 decreased (P less than 0.05) with palm oil treatments and increased (P less than 0.05) with T4 injection. All plasma protein levels significantly increased with T4 injection and total proteins and albumin decreased (P less than 0.05) with cool drinking water, while globulin level increased (P less than 0.05) only with shearing treatment.
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