Hussein,, M., Rabie, M., El. Sherif, K., Kassem, M. (2006). RESPONSE OF EGYPTIAN MAMOURAH PULLETS TO DECREASING DIETARY NONPHYTATE PHOSPHORUS LEVEL IN THE ABSENCE 0R PRESENCE OF EXOGENOUS MlCROBlAL PHYTASE. Journal of Animal and Poultry Production, 31(2), 667-682. doi: 10.21608/jappmu.2006.235436
M. A.A. Hussein,; M. H. Rabie; Kh. El. Sherif; M. G. Kassem. "RESPONSE OF EGYPTIAN MAMOURAH PULLETS TO DECREASING DIETARY NONPHYTATE PHOSPHORUS LEVEL IN THE ABSENCE 0R PRESENCE OF EXOGENOUS MlCROBlAL PHYTASE". Journal of Animal and Poultry Production, 31, 2, 2006, 667-682. doi: 10.21608/jappmu.2006.235436
Hussein,, M., Rabie, M., El. Sherif, K., Kassem, M. (2006). 'RESPONSE OF EGYPTIAN MAMOURAH PULLETS TO DECREASING DIETARY NONPHYTATE PHOSPHORUS LEVEL IN THE ABSENCE 0R PRESENCE OF EXOGENOUS MlCROBlAL PHYTASE', Journal of Animal and Poultry Production, 31(2), pp. 667-682. doi: 10.21608/jappmu.2006.235436
Hussein,, M., Rabie, M., El. Sherif, K., Kassem, M. RESPONSE OF EGYPTIAN MAMOURAH PULLETS TO DECREASING DIETARY NONPHYTATE PHOSPHORUS LEVEL IN THE ABSENCE 0R PRESENCE OF EXOGENOUS MlCROBlAL PHYTASE. Journal of Animal and Poultry Production, 2006; 31(2): 667-682. doi: 10.21608/jappmu.2006.235436
RESPONSE OF EGYPTIAN MAMOURAH PULLETS TO DECREASING DIETARY NONPHYTATE PHOSPHORUS LEVEL IN THE ABSENCE 0R PRESENCE OF EXOGENOUS MlCROBlAL PHYTASE
1Anim. Prod. Res. Institute, A. R. 0., Ministry of Agriculture, Dokki, Giza
2Poultry Production Dept, Faculty of Agriculture. Mansoura University
Abstract
The present study was carried out to evaluate the effects of feeding lcw-
nonphytate-diets, with and without microbial phytase on the productive and
reproductive performance. and egg quality of Mamourah laying hens. Two hundred
and forty, 21-week-old Mamourah hens were assigned to eight equal experimental
groups of 3 replications of 10 birds each, and housed in individual battery cages. Eight
isocaloric (ME; 2700 kcallkg) and isonitrogenous (16% CP) experimental diets
containing graded levels of nonphytate P (NPP', 0.25, 0.225, 0 20 or 0 175%,
equwalent to 100, 90, 80 and 70% of NPP level recommended by NRC 1994 for
laying hens) were formulated in the absence or presence of microbial phytase (MP:
500 Ui'kg diet) and given to the birds, from 21 to 45 weeks of age. At 25 weeks of age
and onwards, the hens were artificially inseminated twice a week using freshly-
collected undiluted semen from cockerels of the same age and strain, which had been
fed the control diet. The criteria of reSponse were change in body weight, productive
performance (daily feed and NPP intakes, egg production rate, egg weight. daily egg
mass and feed conversion ratio), some egg quality traits (egg components and certain
parameters of eggshell and interior quality), reproductive performance (egg fertility,
hatchability, embryonic mortality and hatch weight of chicks), certain blood
parameters (plasma levels of glucose, total lipids, cholesterol, albumin, total calCium
and inorganic P as well as activities of plasma alkaline phosphatase, alanine
aminotransferase and aspartate aminotransferase). Ash, Ca and P contents of tibia
bone and eggshell were also determined. Regardless of dietary MP supplementation,
daily NPP intake and plasma inorganic P concentration were directly related to dietary
NPP level, whereas all other criteria were not significantly affected Dietary
supplemental MP, independent of dietary NPP level, significantly (P5001) Improved
eggshell quality. as measured by percent egg shell, egg speCific gravity and shell
weight per unit surface area, and significantly (P5001) increased the hatch weight of
chicks and plasma alkaline phosphatase activity but had no significant effect on all
other parameters. No significant NPP level by MP interactions were observed for all
criteria measured. it would be concluded that dietary NPP level can be decreased to
0.175% for caged Ma mourah laying hens, without adversely affecting their productive
and reproductive performance or eggshell quality. Even though the results showed
that dietary sUpplementation with microbial phytase was dispensable; yet as long as it
may concern, it appeared to have a slight beneficial effect on eggshell quality.
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