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Effect of coumarin supplementation to growing rabbit diets on alleviation the toxicity of aflatoxin B₁ [electronic resource].

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Helal, Ameni A.A

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Language: English Summary language: Arabic Description: p.803-813Other title:

تأثير إضافة الكيومارين لعلائق الأرانب النامية لتخفيف سمية الأفلاتوكسين ب1 [Added title page title]

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Zagazig journal of agricultural research, 2014 v. 41 (4) [electronic resource].

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In: Zagazig Journal of Agricultural Research 2014.v.41(4)Summary: The present study was conducted in the Department of Animal Production, Faculty of Agriculture, Zagazig University. The experimental work was carried out in Bovine Farm, Experiment Farms Project, Biological Application Department, Radioisotopes Applications Division, Nuclear Research Centre, Atomic Energy Authority, Inshas, Cairo, Egypt. Twelve healthy growing calves including 6 Baladi and 6 cross-bred (50% Brown Swiss x 50% Baladi) calves, were used in this study. The experimental calves were exposed to two climatic conditions. The first was during winter season as mild climate for 3 months. Averages of ambient temperature and relative humidity were 21.8± 0.87°C and 63.7±2.5%, respectively. The second was during summer season as hot climate for 3 months, averages of ambient temperature and relative humidity were 35.25±0.72°C and 55.6± 1.03%, respectively. The THI values were 20.9 and 32.33 during winter and summer, respectively, indicating absence of heat stress during winter season and exposure of the experimental animals to very severe heat stress during summer season. The results showed that the Baladi x Brown Swiss crossbreds surpassed the Baladi local cattle in growth and adaptability to heat stress conditions. The estimated heat tolerance index (HTI) values averaged 68.8% in the crossbreds. The accuracy of the actual tolerance level of the animal was found to increase with the increase of number of traits included in the estimation.

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The present study was conducted in the Department of Animal Production, Faculty of Agriculture, Zagazig University. The experimental work was carried out in Bovine Farm, Experiment Farms Project, Biological Application Department, Radioisotopes Applications Division, Nuclear Research Centre, Atomic Energy Authority, Inshas, Cairo, Egypt. Twelve healthy growing calves including 6 Baladi and 6 cross-bred (50% Brown Swiss x 50% Baladi) calves, were used in this study. The experimental calves were exposed to two climatic conditions. The first was during winter season as mild climate for 3 months. Averages of ambient temperature and relative humidity were 21.8± 0.87°C and 63.7±2.5%, respectively. The second was during summer season as hot climate for 3 months, averages of ambient temperature and relative humidity were 35.25±0.72°C and 55.6± 1.03%, respectively. The THI values were 20.9 and 32.33 during winter and summer, respectively, indicating absence of heat stress during winter season and exposure of the experimental animals to very severe heat stress during summer season. The results showed that the Baladi x Brown Swiss crossbreds surpassed the Baladi local cattle in growth and adaptability to heat stress conditions. The estimated heat tolerance index (HTI) values averaged 68.8% in the crossbreds. The accuracy of the actual tolerance level of the animal was found to increase with the increase of number of traits included in the estimation.

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