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The physiological and immunological effects of dietary zinc oxide on laying hens
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Abstract: A total number 0f 120 White Bovans hens at 56 weeks of age were used to determine the effect of dietary zinc oxide on the reproductive system and immunity response of hens. At 60 weeks of age, birds were divided to 4 equal groups and fed diets supplemented with 0.0, 5000 or 20000 ppm zinc diet for 15 weeks.
Supplementing 5000, 10000 or 20000 ppm zinc oxide to layer diets depressed ovary weight by 43.2, 77.6 or 69.2%, oviduct weight by 61.4, 57.5 or 60.9 and oviduct length by 21.0, 49.5 or 33.8, respectively.
Length of funnel, magnum, isthmus, uterus and vagina were also sharply depressed by treatment. All traits were gradually increased and reached the normal case after 15 weeks from the end of the treatment period.
Adding dietary zinc oxide caused a reduction from 19 to 40% and from 13 to 22% for relative weight of spleen and thymus, respectively. Immune response was improved by using zinc oxide in layer diet. The improvement was 4.3, 31.5 or 35.7 in primary response and 68.8, 110.7 or 139.1 in secondary response at the levels of 5000, 10000 or 20000 ppm dietary zinc oxide, respectively.
Keywords: laying hens, zine oxide, immune.
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| Publication year |
2003
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| Pages |
141-152
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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 |
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| serial title |
Egyptian Poultry Science.
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| Department |
Poultry Breeding Research Department
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Nutrition
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AGROVOC
TERMS |
Immunity.
Layer chickens.
Ovaries.
Oviducts.
Uterus.
Vagina.
Zinc.
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| Publication Type |
Journal
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