Response of Domyati ducklings to diets containing different levels of metabolizable energy and crude protein 1- during growth period

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Abstract: A total number of 540 Domyati ducklings at one-day-old were used, weighed and 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 (3x3) factorial design on growth performance, some blood constituents and carcass characteristics as well as nutrients digestibility of Domyati ducklings during the growing period (0-12 weeks of age). The dietary treatments fed from 0 - 6 weeks of age had 2600(Low), 2800(Medium) and 3000(High) kcal of ME/kg, each contained 18(Low), 20(Medium) and 22(High) % CP, whereas, from 7 - 12 weeks of age, these diets had 2550, 2650 and 2750 kcal of ME/kg and each contained 12, 14 and 16 % CP.
Ressults obtained could be summarized in tile following:
1- Varying levels of ME, CP and their interaction resulted in non significant effect on live body weight (LBW), body weight gain (B WG), feed consumption (FC) and feed conversion ratio (FCR),
2- Eviscerated carcass, edible parts and abdominal fat percentages significantly (P<0.05) increased by increasing ME level, whereas, all relative carcass parts, of Domyati ducklings were not significantly affected due to varying levels of ME and CP and their interaction during growing period.
3- Ether extract and ash content of both breast and thigh meat were not affected due to varying levels of ME and CP in the diet, whereas, protein content was significantly increased as dietary ME level increased.
4- Plasma total lipids and cholesterol values of Domyati ducklings were significantly (P < 0.01) decreased by high ME level in the diet, whereas, plasma total protein values were significantly increased. On the other hand, all studied plasma parameters were not affected due to varying CP levels in the diet.
5- All nutrients digestibility were not significantly affected due to ME level in the diet with the exception of EE which was significantly improved by low-ME level, whereas, medium-CP level improved nutrients digestibility of Domyati duckling during growing period Both of TDN % and ME kcal/kg were insignificantly improved by feeding diet contained medium level of ME and CP.
6- Protein utilization efficiency (PUE) values were not affected due to varying ME level in the diet, whereas, it were significantly decreased by increasing CP levels in the diets during the periods 0-6 and 0-12 wks of age. Both of ME and CP levels in the diet and their interaction did not significantly affect energy utilization efficiency (EVE) and production index (PI) of ducklings during the whole experimental period (0-12 wks).
These results indicated that the combination of high-ME and low.
protein levels could be used in Domyati ducklings diets to maximize the productivity and carcass traits during growing period (0-12 wks of age).

Publication year

2010

Pages

535-564

Availability location

معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى - الجيزة

Availability number

Organization Name

Animal Production Research Institute (APRI)

City

الاسكندرية

serial title