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Effects of Dietary Energy and Protein Levels on Growth of Egg Breeder Pullets  

노성래 (건국대학교 축산대학 동물자원연구센터)
유선종 (건국대학교 축산대학 동물자원연구센)
김성권 (건국대학교 축산대학 동물자원연구센)
김은집 (건국대학교 축산대학 동물자원연구센)
안병기 (건국대학교 축산대학 동물자원연구센)
강창원 (건국대학교 축산대학 동물자원연구센터)
Publication Information
Korean Journal of Poultry Science / v.30, no.2, 2003 , pp. 73-81 More about this Journal
Abstract
This experiment was conducted to investigate the effects of dietary energy and protein levels on the growth rate of egg breeder pullets. A total of 360 Hy-Line Brown pullets aged 2 to 6 weeks (Phase I) were fed 5 rations differing in dietary protein (17, 19 and 20%) and energy (2,800, 2,950 and 3,050 kcal/kg, TMEn) leveIs for a period of 5 weeks and those aged 6 to 10 weeks (Phase II) were fed 5 rations differing in dietary protein (15, 16 and 17%) and energy (2,800, 2,900 and 3,000 kcal/kg, TMEn) levels in order to evaluate the optimum dietary energy and protein leveIs for egg breeder pullets reared in cages. Their body weight gains were significantly influenced by the dietary protein levels (P<0.05). The dietary energy levels did not greatly affect the growth performances throughout the experimental period. The low energy and protein regimen based on NRC requirement (control) was found to produce smaller pullets and lower tibia bone measurements as compared to the higher regimen groups. With the increase in dietary energy and protein levels, tibial bone strength and ash content also gradually increased (P<0.05). There were no significant differences in the flock uniformity among the treatments. These results indicate that increases in dietary energy and protein levels above the NRC requirements appeared to be more effective in obtaining the optimal growth and bone developments of egg breeder pullets reared in cage.
Keywords
growth rate; tibia; bone measurements; flock uniformity; egg breeder pullets;
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