youssef, S., Radwan, L., Eshera, A., Mohamed, M., Abd El-Halim, H. (2019). LATE STAGE RESPONSES OF LAYING CHICKENS FED DIETS SUPPLEMENTED WITH DIFFERENT SOURCES AND LEVELS OF VITAMIN D: 1- PRODUCTIVE AND REPRODUCTIVE PERFORMANCE.. Egyptian Poultry Science Journal, 39(1), 173-191. doi: 10.21608/epsj.2019.29136
sabbah farouk youssef; Lamiaa M Radwan; Abeir A Eshera; Manal S Mohamed; H A Abd El-Halim. "LATE STAGE RESPONSES OF LAYING CHICKENS FED DIETS SUPPLEMENTED WITH DIFFERENT SOURCES AND LEVELS OF VITAMIN D: 1- PRODUCTIVE AND REPRODUCTIVE PERFORMANCE.". Egyptian Poultry Science Journal, 39, 1, 2019, 173-191. doi: 10.21608/epsj.2019.29136
youssef, S., Radwan, L., Eshera, A., Mohamed, M., Abd El-Halim, H. (2019). 'LATE STAGE RESPONSES OF LAYING CHICKENS FED DIETS SUPPLEMENTED WITH DIFFERENT SOURCES AND LEVELS OF VITAMIN D: 1- PRODUCTIVE AND REPRODUCTIVE PERFORMANCE.', Egyptian Poultry Science Journal, 39(1), pp. 173-191. doi: 10.21608/epsj.2019.29136
youssef, S., Radwan, L., Eshera, A., Mohamed, M., Abd El-Halim, H. LATE STAGE RESPONSES OF LAYING CHICKENS FED DIETS SUPPLEMENTED WITH DIFFERENT SOURCES AND LEVELS OF VITAMIN D: 1- PRODUCTIVE AND REPRODUCTIVE PERFORMANCE.. Egyptian Poultry Science Journal, 2019; 39(1): 173-191. doi: 10.21608/epsj.2019.29136
LATE STAGE RESPONSES OF LAYING CHICKENS FED DIETS SUPPLEMENTED WITH DIFFERENT SOURCES AND LEVELS OF VITAMIN D: 1- PRODUCTIVE AND REPRODUCTIVE PERFORMANCE.
1poultry production department- animal production research institute- agriculture research center- Cairo- Egypt
2Dept. of Poult. Prod., Fac. of Agric., Ain Shams Univ., Cairo, Egypt.
3Anim. Prod. Res. Ins., Agric. Res. Center, Giza, Egypt.
Abstract
This experiment was conducted to study the effect of supplementing layer diets with two vitamin D (VD) sources included three levels from each of vitamin D3 (VD3) and 25-hydroxycholecalciferol (25-OHD3) on egg production and reproduction performance. At 11 month of age 189 layers and 21 cocks were chosen and distributed equally into 9 groups. Each group contained 3 replicates contained 7 hens and 1 cock each. Nine experimental diets were formulated, the first one was control diet that contained 2500 IU VD3/kg diet. The 2nd and 3rd diets formed by supplemented control diet with 1250 and 2500 IU VD3/kg diet respectively. The previous three diets supplemented with 0.04 mg 25-OHD3/kg diet to create the 4th, 5th and 6th diets respectively. To perform 7th, 8th and 9th diets the first three diets supplemented with 0.08 mg 25-OHD3/kg diet respectively. The experiment was extended for four months and egg production performance, reproduction performance and liver enzymes were measured. The following results were obtained:
Supplementation of 25-OHD3 improved significantly egg production% during the 2nd month and entire experimental period. Increasing total VD content than NRC (1994) increased significantly (P< 0.05) egg production% than control treatment after the 2nd month. Hen's persistence showed clear improvement especially with diets contained total VD from 0.125 to 0.17375 mg/kg. Egg mass per hen per day was improved as seem as egg production%. Feed intake of entire experimental period was increased significantly (P < 0.05) by increasing VD than NRC 1994. Significant improvement (P < 0.05) was observed in feed conversion when diet contained 0.17375 VD mg/kg compared with control treatment. Neither reproduction performance nor liver function influenced significantly by VD source and levels. We recommend that 25-OHD3 should combine with VD3 in layer diets at late stage but not more than 0.17375 mg/kg.
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