EFFECTS OF SUPPLEMENTAL MICROBIAL PHYTASE AND VITAMIN 03 ON CALCIUM AND PHOSPHORUS UTILIZATION BY GIMMIZAH LAYING HENS FED LOW Ca AND P DIETS | ||
| Journal of Animal and Poultry Production | ||
| Article 6, Volume 29, Issue 6, June 2004, Pages 3075-3090 PDF (1.68 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jappmu.2004.239174 | ||
| Authors | ||
| H. A. Abou Khashaba,1; M. A. lbrahim1; M. A. M. Sayed1; M. H. Rabie2 | ||
| 1Animal Prod. Res. Inst., Agric. Res .. Center I Ministry of Agriculture, Egypt. | ||
| 2Po'ultry Production Department, Faculty of Agriculture, Mansoura University, EI~Mansoura, Egypt. | ||
| Abstract | ||
| The present study was performed to investigate the effects of feeding low- Ca-P·diets. supplemented with microbial phytase and vitamin D3. on productive performance. eg9 quality, eg9 fertility and hatchability, and some blood constituents of Gimmizah laying hens. Three hundred and thirty. 28·week-old birds were randomly distributed into ten equal groups; each group was divided into 3 replications of 11 birds each (ten females and one male) and housed in floor pens. All birds were kept under the same managerial conditions and fed their respective experimental diets from 28 up to 48 weeks of age. Ten isoenergetic (metabolizable energy of about 2770 kcallkg)-isonitrogenous (crude protein of about 16.35%) experimental diets were prepared and used. The control diet (Diet 1) was formulated to contain 3.28% Ca and 0.42% available P (AP). Diet 2 (served as a negative control) was the same as the control diet (Diel 1.) but had only 75% and 50% of the Ca and AP contents of the control diet, respectively. The remaining eight diets were obtained by supplementing the negative control diet (Diet 2) with two microbial phytase (MP) levels (500 or 1000 Ulkg; Diets 3 and 4, respectively). two vitamin 03 (VO) levels (400 or 800 lUlkg; Diets 5 and 6, respectively), or with different combinations of MP and VD (500 U MP+400 IU VD. 500 U MP+800 IU VO, 1000 U MP+400 IU VD or 1000 U MP+800 IU VDlkg diet; Diets 7. 8, 9 and 10. respectively). Records on body weight. daily feed intake, egg production rate (EPR). egg weight (EW), daily egg mass (OEM) and feed conversion ratio (FCR; 9 feed: 9 egg) were maintained. A series of egg quality tests were made at four-week intervals. Egg fertility. hatchablity (% of total eggs) and total embryonic mortality, and egg-weight-loss (%) of hatching eggs were evaluated. At the end of study. some blood plasma parameters (total protein, albumin (A), glubulin (G). NG ratio, Ca, inorganic P, and activities of Iransaminases: AL T and ASl1 and tibia bone length and width, and its Ca and P contents were determined. The results obtained can be summarized as follows: Birds fed on Diet 2 (negative control diet; NCO) performed less, but significantly similar to those fed on Diet 1 (control) for EPR, OEM and FCR. On the other hand, birds fed on NCO with supplemental MP, VD or their combinations (Diets 3 to 10) Significantly surpassed those of either control or negative control in EPR and OEM with a concomitant improvement in FCR. Feeding the negative control diet (NCD) adversely affected eggshell quality (shape index. relative shell weight and shell thickness), interior quality (yolk index and Haugh units), egg fertility, eggshell and tibia Ca contents and plasma concentrations of TP, Ca. and inorganic P compared with the control diet, all other measurements were not affected. Supplementing the NCO with MP alone. particularely with the high level of MP (1000 UII<g). offset the negative effects of feeding the NCD and significantly increased EPR, DEM and FCR, and also attained significant improvements in relative yolk weight. yolk index, I-'augh units and tibia P content. compared with the control diet. | ||
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