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Manganese requirement of Dandarawi and Dokki4 laying hens
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Abstract: The experiment was conducted to determine the effect of using different levels of dietary manganese on egg production and egg quality of two local strains: Dandarawi and Dokki4 layer hens to determine their manganese (Mn) requirement.
Two hundred and fifty six hens (23 weeks old), 128 hens for each strain divided into 4 groups (8 replicates/group),(4 hens/replicate). Hens were fed on four experimental diets : a basal diet ( without supplemental Mn) and three basal diets supplemented with Mn ( as manganese sulphate) at levels of 30,60 and 90 mg Mn/ kg diet. The experiment extended for 12 weeks in 3 intervals, 4 weeks each. Egg production measurements and egg quality parameters were recorded at 4 weeks intervals. The multi-layer structure of the eggshell was studied using Scanning Electron Microscopy (SEM).
Main results obtained can be summarized as follows:
- Results of the overall period showed that egg production parameters for the two strains: Dandarawi and Dokki4 had the same trend. There were a significant differences between hens fed on the basal diet and all treatments in egg number (EN), egg weight (EW), egg mass (EM), feed intake (FI) and feed conversion (FC).
- Concerning egg quality parameters it was found that shell thickness of both Dandarawi and Dokki4 hens had improved significantly with increasing manganese supplementation.
- Results showed that both Dandarawi and Dokki4 hens fed on the basal diet supplemented with 90 ppm Mn gave the best shell thickness (ST).
- The level of 90 mg Mn/kg diet was the sufficient level for egg production and the best shell thickness.
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| Publication year |
2008
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| Pages |
1097-1114
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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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| City |
الاسكندرية
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| serial title |
Egyptian Poultry Science
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| ISSN |
1110-5623
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| Author(s) from ARC |
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| Agris Categories |
Animal feeding
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AGROVOC
TERMS |
Egg production.
Layer chickens.
Manganese.
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| Proposed Agrovoc |
egg quality;local strains;
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| Publication Type |
Journal
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