Comparative study for different levels of energy and protein in local duck breeds rations during laying period
Abstract: A total number of 378 Sudani ducks (297 female and 81 male) at 26-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, egg chemical analysis and nutrients digestibility as well as some blood constituents during the laying period (26-49 wks of age). The dietary treatments had 2750, 2850 and 2950 kcal ME/kg, each contained 15, 17 or 19 % CP.
Results indicated that daily egg number (EN), egg mass (EM) per duck, feed consumption (FC) and feed conversion (FCR) were not significantly affected by feeding varying ME diets, while feeding both 15 and 17 %CP diets had significantly improved EN, EM and FCR during the overall experimental period (26-49 wks). The best values of EN, EM and FCR were occurred by feeding 2850 kcal ME/kg and 17% CP diet during the overall experimental period (26-49 wks).
All egg quality parameters were not significantly affected due to feeding different ME, CP levels and their interactions except HU which was significantly (P<0.05) decreased by increasing ME level in the diet. Both of relative egg shell weight percentage and shell thickness 'values were significantly increased by feeding 17 %CP as compared with that of , 19 %CP diet only. Chemical composition of internal egg solid~ were significantly affected by feeding varying ME levels, while it were insignificantly affected due to different CP levels in the diet. Interaction between ME and CP had no significant effects on all egg quality parameters.
All studied plasma constituents of Sudani ducks were not significantly affected due to feeding different levels of both ME and CP in the diet and their interaction except AST which was significantly increased by feeding 2850 or 2950 kcal ME/kg diet only. All nutrients digestibility were not significantly affected by feeding different ME diets except dry matter (DM), organic matter (OM) and nitrogen free extract (NFE). Moreover, crude
protein. digestibility was significantly improved, whereas, EE digestibility was decreased by increasing CP level m the diet. These results indicated that a diet contained 2850 Kcal ME/kg and 17 % CP could be used to improve the laying performance and egg quality of Sudani ducks.
Keywords: Metabolizable energy, crude protein, duck, laying performance
Publication year 2013
Pages 825-847
Availability location معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة
Availability number
Organization Name
City الاسكندرية
serial title Egyptian Poultry Science Journal
ISSN 1110-5623
Author(s) from ARC
Agris Categories Animal physiology - NutritionAnimal physiology - Reproduction
AGROVOC
TERMS		 Blood composition. Crude protein. Ducks. Energy value. Feed consumption. Feed conversion efficiency. Females. Laying performance. Males.
Proposed Agrovoc egg quality;egg chemical analysis;nutrients digestibilites;egg number;egg mass;
Publication Type Journal
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