Abstract
800x600 DOI: 10.15414/afz.2014.17.03.79–83 Received 13. May 2014 ǀ Accepted 3. June 2014 ǀ Available online 27. August 2014 An experiment was conducted to determine the effect of different levels of exogenous phytase on egg quality in laying hens fed diets with low levels of only plant original phosphorus. Twenty four Lohmann Brown hens at 31 weeks of age were housed in individual cages. In total three experiments were successively carried out with the same laying hens. In all three experiments the same diet with the same content of nutrients were always used. The control diet contained no exogenous phytase. Experimental diets differed in the level and sources of exogenous phytase. Eggs were collected daily during period of the experiment to measure egg quality. Measurement of physical parameters such as egg weight and strength of eggshell were performed daily. Shell weight and shell thickness were determined after washing and drying of shells. The shell thickness was evaluated using the micrometer. Shell proportion was calculated. The addition of phytase (150, 200, 250 and 300 FTU/kg diet) did not affect egg weight. Addition of exogenous phytase at levels 150, 200 and 250 FTU/kg had no significant effect (P>0.05) on eggshell quality. Only addition of both phytases (Natuphos and Optiphos) at the level 300 FTU to the same diet had positive effect on eggshell quality (P<0.05) . Keywords: laying hens, feeds, phytase, phytate, egg quality, eggshell Normal 0 21 false false false CS X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:Normalni tabulka; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:Times New Roman,serif;}
Highlights
Phosphorus (P) is one of the essential minerals for all animals
The supplement of phytase Natuphos at the level 150 FTU had no significant effect on eggshell quality (P >0.05)
Diet with phytase Natuphost 300 FTU resulted in significantly higher strength of shell, shell thickness, shell weight and shell proportion (P
Summary
Phosphorus (P) is one of the essential minerals for all animals. It plays a critical role in cellular metabolism, as a part of the energy currency of the cell, in cellular regulatory mechanism, and in bone (85 % of P is in bone). P contained in plants in phytate form is only utilizable by monogastric animals from 20 to 30 % (Zobač et al, 1997). This unavailability is due to the very low phytase activity found in the digestive tract (Pallauf et al, 1994). A high or low level of available P in a laying hens diet may adversely affect the birds performance and reduce the eggshell quality (Harms, 1982). This study was conducted to determine the effect of different levels of exogenous phytase on egg quality in laying hens fed diets with low levels of only plant original phosphorus
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
