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 | ||||
Article 11, Volume 39, Issue 1, March 2019, Page 173-191 PDF (957.71 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/epsj.2019.29136 | ||||
View on SCiNiTO | ||||
Authors | ||||
sabbah farouk youssef 1; Lamiaa M Radwan2; Abeir A Eshera3; Manal S Mohamed3; H A Abd El-Halim3 | ||||
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. | ||||
Keywords | ||||
25-hydroxycholecalciferol-vitamin D3-egg production | ||||
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