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Response of Domyati duck to diets containing different levels of metabolizable energy and crude protein
2-During laying period
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Abstract: A total number of 378 Domyati ducks (297 female and 81 male) at 20-wks-old were divided into nine treatment groups of 3 replicates each. to investigate the effect of different dietary levels of metabolizable energy (ME) and crude protein (CP) in a (3x3) factorial design on laying performance, egg quality parameters(EQP) egg chemical analysis and nutrients digestibility as well as some blood constituents during the laying period (20-44 weeks of age). The dietary treatments had 2750. 2850 and 2950 keal ME/kg each contained 15. 17 or 19 % CP.
Results indicaled that the interaction between dietary ME and CP levels in the diets17 and 19%CP had no significant effect on LBW of Domyati laying ducks at the end of experimental period, whereas it was significantly lower by feeding 15% CP diet. Egg number.
egg mass per duck and feed conversion (g feed /g egg) were significantly improved by feeding diet containing 2750 Kcal ME/kg and 19 %CP during the overall period (20-44 why. Feed consumption (g/duck/ 28 day) was not significantly affected due to different levels of both ME and CP in the diet during the overall period (20-44wks).
Yolk percentage and yolk index were significantly (P<0.05) increased whereas albumin percentage was significantly decreased, and shell parameters and shape index were not significantly affected by increasing ME level in the diet. Both of shell weight percentage and thickness values were significantly increased by feeding 15 % Cp diet as compared only with that of 17 % CP die,. On the other hand, all EQP were not significantly affected due to the interaction between ME and CP levels in the diet. Diffirent levels of ME and CP in the diets and their interaction had no significant effects on total solids of whole egg, yolk and albumin percent. Feeding 2950 Keal ME/Kg and 19 % CP diet significantly increased protein content of total egg solids, whereas. ash content was significantly decreased
All nutrients digestibility were not significantly affected by feeding different ME levels in the diets except crude fiber which was significantly improved by 2950 Kcal ME/kg, whereas, CP and EE digestibility as well as TDN were significantly (P< 0.01) improved by increasing CP level in the diet. Plasma total protein . albumin. globulin. total lipids and ALT values of Domyati ducks were significantly (P < 0.01) decreased by feeding 2750 Kcal ME/kg diet, whereas, plasma total cholesterol and AST values were not significantly affected On the other hand . all studied plasma constituents were not affected due to varying CP levels in the diet except albumin and total lipids which were significantly increased by feeding 19% CP in the diet.
These results indicated that a diet contained 2750 Kcal ME/Kg and 19% CP could be used to improve the laying performance, egg quality and nutrients digestibility of Domyati ducks.
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| Publication year |
2011
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| Pages |
77-95
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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 Journal
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| ISSN |
1110-5623
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| Author(s) from ARC |
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| Agris Categories |
Animal physiology - Reproduction
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AGROVOC
TERMS |
Blood composition.
Crude protein.
Ducks.
Energy value.
Feed consumption.
Feed conversion efficiency.
Laying performance.
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| Proposed Agrovoc |
egg quality;egg chemical analysis;nutrients digestibilites;Egg number;Egg mass;
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| Publication Type |
Journal
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