| Titles |
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English :
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Effect of two different housing systems on the performance of new Zealand white rabbits under hot and mild climatic conditions of middle Egypt
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Arabic :
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تأثير نوعين مختلفين من نظم الاسكان على اداء الارانب النيوزيلندى الابيض تحت الظروف الجوية الحارة و المعتدلة لمصر الوسطى
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| Abstract |
One hundred and forty males and females NZW rabbits aged 6 weeks were used in the study during two periods. In the 1st period (May-October, hot condition), 40 rabbits of each males and females with 798.1±8.6g average body weight and other 30 rabbits of each males and females averaged 821.8 ± 9.8g, body weight, were used in the second period (November-April, mild condition). In each period, the animals were divided into two equal groups according to the housing system. The first group was raised in semi-closed rabbitry and the second was housed in open rabbitry under shed.
The estimated temperature-humidity index values were 35.34 and 28.41 during the hot climate and 23.45 and 21.02 during the mild climate periods inside the semi-closed building and under the shed, respectively, indicating exposure of rabbits raised in semi-closed building to very severe heat stress and those raised under shed exposed to moderate heat stress during the hot period and absence of heat stress in the mild period. The type of housing (semi-closed system) and period of the year (heat stress) negatively affected many of the studied traits. These effects were significant (P<0.01 or 0.05) on growth performance, dressing percentage, thermoregulatory and hematological responses, some blood plasma constituents for male and female growing rabbits and also testosterone concentration, age at puberty, body weight, weights and histopathological structures of testes and epididiemus, reaction time and semen characteristics of male rabbits. Mortality rate was increased (P<0.05) with increasing air temperature during hot period for rabbits housed in semi-closed system, and with decreasing air temperature during mild period/or rabbits raised in open system. Exposure of young doe rabbits reared in semi-closed system to very severe heat stress adversely affected (P<0.01 or 0.05) body weight, estrogen concentration, ovaries weights, number of Graffian follicles and reproductive efficiency during first parity. Results obtained in the present study indicating that, open housing system was the most favorable housing during hot period in middle Egypt which reduced the deleteriously effects resulted in stressful hot condition and improved economical efficiency either in rabbits meat production or breeding
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| Publication year |
2007
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| Pages |
851-874
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| Availability location |
معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
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| Availability number |
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| Organization Name |
Animal Production Research Institute (APRI)
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| City |
الاسكندرية
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| serial title |
Egyptian Poultry Science
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Growth and developmentAnimal physiology - Nutrition
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AGROVOC
TERMS |
Animal breeding.
Animal housing.
Performance testing.
Rabbits.
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| Publication Type |
Journal
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