| Titles |
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English :
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Effects of dietary betaine supplementation on growing rabbits under heat conditions
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Arabic :
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تأثير اضافة البيتاين على الارانب النامية تحت الظروف الحارة
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| Abstract |
The objective of the present study is to determine the effects of dietary betaine supplementation on growth perfomance, carcass characteristics, rectal temperature, respiration rate and immune response of growing rabbits under high ambient temperature. Ninety New Zealand (NZW) rabbits weaned at 6 weeks of age were randomly divided into five experimental treatments (n=18) and were provided with water and a commercial pelleted basal diet ad libitum. Animals were fed the basal diet supplemented with 0 (control), 250, 500, 750 and 1000 mg betaine /kg diet for 12 continuous weeks. The avarage daily temperature and relative humidity inside the house reached about 30.3±0.9 °C and 76.2±2.5 %, respectively. Results obtained showed that under heal stress condition, inclusion of betaine in the growing rabbit diets increased the final body weight and hot carcass weight (P< 0.05) by 20 and 34.7 %, respectively and improved (P< 0.05) the feed conversion by 12% as the level of betaine increased from 0 to 1000 mg / kg in rabbit diets. Betaine supplementation ameliorated some of the adverse effects of heat stress on immune response, rectal temperature and respiration rate. The inclusion of 1000 mg betaine/kg in the growing rabbit diets markedly enhanced the humoral and cellular immune response being about two-fold its corresponding value of controls and significantly reduced rectal temperature and respiration rate. Serum T3, T4, total protein, globulin and total lipids were significantly increased (P< 0.05) while serum glucose concentratio was significantly decreased due to dietary betaine. Digestibility coefficient of CP, EE and NFE were increased (P<0.05) by 12,8, 10.7 and 10.6% in rabbits feed with 1000 mg/ kg as compared with those fed control diet, In conclusion, supplementation of betaine in growing rabbits diets enhanced growth performance and carcass weight, however, stabilized the normal physiological balance, and elevated the Immoral and cell-mediated immunity as well as reduced rectal temperature and respiration rate in growing rabbits exposed to heat stress.
Keywords: Betaine, stress, performance, carcass, immunity, digestibility.
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| Publication year |
2009
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| Pages |
119-136
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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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| serial title |
Egyptian Journal of Rabbit Science
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| ISSN |
1110-2594
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| Author(s) from ARC |
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| External authors (outside ARC) |
طارق امين عبيد
جامعة كفر الشيخ
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Betaine.
Carcass composition.
Digestibility.
Heat.
Immunity.
Performance testing.
Rabbits.
Stress.
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| Publication Type |
Journal
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