EFFECT OF PHYTASE ENZYME ADDITION TO  RATIONS CONTAINING DIFFERENT PERCENTAGES OF PHOSPHOROUS , CALCIUM AND AMINO ACIDS ON SOME PRODUCTIVE TRAITS OF LAYING HENS

	EFFECT OF PHYTASE ENZYME ADDITION TO RATIONS CONTAINING DIFFERENT PERCENTAGES OF PHOSPHOROUS , CALCIUM AND AMINO ACIDS ON SOME PRODUCTIVE TRAITS OF LAYING HENS
Euphrates Journal of Agriculture Science
Article 1, Volume 5, Issue 1, 2013, Pages 76-96
Abstract
ABSTRACT: Three hundred laying hens ( ISA Brown ), Holandian origin were used , fed on five basal rations were deficent essential ( lysine and methionine ) of amino acid , available phosphorus and Calcuim . each ration was either treated or (un) treated with phytase enzyme . and be come the number of trentments is ten . Results showed the following : 1- Addition of phytase enzyme to the control ration led to a significant improvement of egg production percentage , feed conversion rate and yolk index , mean while there was no significant effect of the enzyme on egg weights, Haugh unit , shell less eggs percentage and feed consumption. 2- A significant improvement of egg production percentage , feed conversion , egg mass , body weight and yolk index when phytase enzyme added to rations which were deficient of nutrient elements such as amino acids (lysine and Methionine) and available phosphorous with calcium , each alone or together , while there was no significant effect on egg weights , Haugh unit and feed consumption as compared the same rations which were without phytase enzyme. 3- A significant improvement of the percentage of shell less eggs when the phytase enzyme was added to the ration deficient of calcium element and ration deficient of amino acids with available phosphorous and calcium together .

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