scholarly journals Influence of supplemental microbial phytase on first cycle laying hens fed phosphorus-deficient diets from day one of age

1999 ◽  
Vol 78 (10) ◽  
pp. 1407-1411 ◽  
Author(s):  
S Punna ◽  
DA Roland
Keyword(s):  
Laying Hens ◽  
Microbial Phytase

The Effects of Combination of Ethylenediaminetetraacetic Acid and Microbial Phytase on the Concentration of Some Minerals of Serum in Laying Hens

2008 ◽  
Vol 3 (5) ◽  
pp. 351-356 ◽  
Author(s):  
Yahya Ebrahim-Ne ◽  
Ghassem Habibi Bibalani ◽  
Ebrahim Jafari Helan ◽  
Keyvan Hatefi Nezhad ◽  
Jalil Dolgari Sharaf ◽  
...  
Keyword(s):  
Laying Hens ◽  
Ethylenediaminetetraacetic Acid ◽  
Microbial Phytase

The Effects of Combination of Citric Acid and Microbial Phytase on the Concentration of Some Minerals of Serum and Parameters of Mineralization of Tibia in Commercial Laying Hens

2008 ◽  
Vol 3 (5) ◽  
pp. 375-380 ◽  
Author(s):  
Yahya Ebrahim Nezhad ◽  
Naser Maheri Sis ◽  
Abolfazl Aghajanzade Gholshani ◽  
Yaghob Saedi ◽  
Reza Aminvakili
Keyword(s):  
Citric Acid ◽  
Laying Hens ◽  
Microbial Phytase

The Effects of Combination of Citric Acid and Microbial Phytase on the Egg Quality Characteristics in Laying Hens

2008 ◽  
Vol 3 (5) ◽  
pp. 293-297 ◽  
Author(s):  
Y. Ebrahim Nezhad ◽  
N. Maheri Sis ◽  
H. Aghdam Shahryar ◽  
M.R Dastouri ◽  
A. Aghajanzadeh Golshani ◽  
...  
Keyword(s):  
Citric Acid ◽  
Laying Hens ◽  
Egg Quality ◽  
Quality Characteristics ◽  
Microbial Phytase

scholarly journals The ability of laying hens to regulate phosphorus intake when offered two feeds containing different levels of phosphorus

2004 ◽  
Vol 92 (2) ◽  
pp. 233-240 ◽  
Author(s):  
G. R. Barkley ◽  
H. M. Miller ◽  
J. M. Forbes
Keyword(s):  
Laying Hens ◽  
Phase 1 ◽  
Factorial Experiment ◽  
P Deficiency ◽  
Body Weights ◽  
Microbial Phytase ◽  
Selection For ◽  
Different Levels ◽  
Subsequent Selection ◽  
Phosphorus Intake

The ability of laying hens to adjust their intake of available P (AP) was investigated with a maize–soyabean diet fed to forty-eight individually caged birds in a 2×4 factorial experiment. From 19 to 25 weeks of age (phase 1) twenty-four birds were fed a normal-P (NP) diet (2·2 g AP/kg DM) and twenty-four were fed a low-P (LP) diet (1·1 g AP/kg). LP eggs were lighter (51 v. 54 (sem 1·0) g; P>0·05), providing evidence that the LP diet was deficient in AP. From 25 to 28 weeks of age six hens from each phase 1 treatment were fed either the NP or LP diet alone or a choice of the LP and NP feeds or a choice of the LP feed and a phytase-supplemented (PP) feed (LP diet with 400 microbial phytase units/kg). With a choice of the NP and LP feeds, the hens fed the LP diet in phase 1 ate a smaller proportion of the LP feed (34 (sem 12·0)%) than the hens fed the NP diet in phase 1 (72 (sem 12·0)%; P>0·05), showing that P deficiency influenced subsequent selection for AP, i.e. an appetite for P was demonstrated. In those birds offered the LP and PP feeds, the presence of phytase in one of the two feeds significantly alleviated the effect of P deficiency on egg and body weights. The proportion of the LP diet chosen was not significantly affected by phase 1 treatment; it was not necessary for the hens to eat more than 50% of PP feed.

Sign in / Sign up

Export Citation Format

Share Document