| Titles |
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English :
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Effect of dietary ascorbic acid and betaine on recovery from heat stress adverese effects in slow-growing chicks in the subtropics
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Arabic :
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تأثير حامض الاسكوربيك و البيتايين في العلف على الاستشفاء من الاثار السيئة للاجهاد الحرارى في الكتاكيت بطيئة النمو في المناطق شبة الاستوائية
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| Abstract |
This research was conducted to study the effect of dietary ascorbic acid (AA) and Betaine (Bet) to relief the adverse effects of heat stress (HS) on performance of slow-growing chicks in the subsubtropics. Three hundreds 21-d old chicks from El-Salam strain were randomly divided among 5 treatments (each of 5 replicates of 12 unsexed chicks each) and housed in floor pens. One group was kept under thermoneutral condition at 28±4°C and 55±3% relative humidity (RH) during 21-84 d of age and fed practical corn-soybean meal basal diet (positive control). The other four groups were kept for three successive days weekly under HS at 38±1.4 6C and 49±2% RH from 12.00 to 16.00 pm. Chicks in HS treatments were fed basal diet without (negative control). with 250 mg AA/kg diet or Bet at 0.5 and 1g/kg diet. HS decreased (p<0.05) body weight gain. feed intake, blood glucose and total protein contents.
humoral immune competence to sheep red blood cell (SBRCs), dressing, liver and giblets percentages and meat water holding capacity (WHC); impaired feed conversion (FC) and economic efficiency (EE, 33%); and increased meat dry matter and blood Ca and triglycerides contents. Adding AA and Bet into basal diet alleviated (P<0.05) the HS adverse effects on growth. feed intake. FC, protein digestibility and dressing. liver and giblets percentages. Also, a complete recovery from the adverse effects on plasma glucose and partial recovery (P<0.05) was observed in total protein, triglycerides, blood pH, packed cell volume (PCV), hemoglobin (Hb), immune competence to SBRCs, rectal temperature (RT) and respiration rate (RR). Bet at 1g/kg and AA at 250 mg/kg diets was equally potent for partial relief of HS effects on the performance and EE (27%) for slow-growing chicks.
Keywords: Ascorbic acid, betaine, heat stress, chickens, performance, physiological
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| Publication year |
2008
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| Pages |
367-383
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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 Animal Production
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| Author(s) from ARC |
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| External authors (outside ARC) |
يوسف عطية
زراعة دمنهور- جامعة الاسكندرية
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| Agris Categories |
Animal feeding
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AGROVOC
TERMS |
Ascorbic acid.
Betaine.
Chickens.
Heat stress.
Performance testing.
Stress.
Subtropical zones.
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| Publication Type |
Journal
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