STUDY OF SOME FEED ADDITIVES TO IMPROVE PHOSPHORUS UTILIZATION IN BROILER DIETS

Abstract

This study was carried out at the Poultry Nutrition Farm, Shalqan, Qalyubia governorate. Two identical experiments were conducted to determine the effect of using extra Formi NDF levels in the presence of low levels calcium (Ca) and available phosphorus (AP) diets on broiler productive performance, plasma levels of Ca and P, mineral retention, bone measurements, ilium histomorphology and microbiology. Throughout each of these two experiments, 200 unsexed 1 day old Hubbard broiler chicks were randomly distributed into 10 treatments. There are ten dietary treatments were distributed as control, three calcium and phosphorus levels (50, 40 and 30%) from requirement with three Formi NDF levels first, recommended level (1.50Kg/ ton) second diets contains 150% (2.25Kg/ ton) and third diets contained 200% (3.00Kg/ ton). Each treatment comprised of 20 chicks which were split into 4 replicates of 5 chicks each. The results obtained from these experiments are summarized as follows:

Experiment one: 1. Live body weight values indicated that birds fed either control diet or diets contained 2.25 and 3.00 Kg/ ton of Formi NDF diet were heavier than those fed (T2) or (T3) diet. 2. Body weight gain of birds fed control or diets contained 2.25 and 3.00 Kg/ ton of Formi NDF diet were larger than of those fed (T2) diet. 3. Birds fed (T4), (T5) or (T7) diet consumed more feed than those fed control diet, and while birds fed (T2) diet consumed the lowest amount of feed. 4. Feed conversion ratio of birds fed either control diet or 1.5Kg/ ton Formi NDF were better than those fed 3.00Kg/ ton Formi NDF with different Ca and P levels, while birds fed control or 1.50% NDF diet had analogous values. 5. Mortality percent was within normal range 2.5% and occurred within earlier age. 6. Plasma Ca concentrations indicated that birds fed either control, (T4), (T5), (T6), (T7) or (T8) diet have higher values than those fed 1.50Kg/ ton NDF diet. 7. Plasma P levels of birds fed (T3), (T4) or (T6) diet were higher than of those fed control diet. 8. Plasma alkaline phosphatase activity indicated that birds fed either control, (T8) or (T9) diet have higher value, whereas birds fed (T5) diet has the lowest value. 9. Birds fed either control, (T7) or (T8) diet had higher tibia ash percentages, while chicks fed (T6) obtained the lowest value. 10. Tibia Ca % for birds fed control, all 3.00Kg/ ton NDF groups were higher than those fed 2.25Kg/ ton NDF. 11. Birds fed control diet recorded significantly the highest tibia P percentage while birds fed (T8) diet recorded the lowest value. 12. Values of tibia breaking strength appeared significantly similar among different dietary treatments. 13. Wet tibia weight percentage appeared significantly similar among different dietary treatments. Additionally, birds fed either control, (T5) or (T7) diet have longer tibiae than those fed other treatments. Also, birds fed control, (T2), (T3) or (T8) diet have broader tibiae, while birds fed (T6) diet had the lowest tibia width. 14. Birds fed control diet calcium and phosphorus per bird per day intake and excrete higher than other treatments. 15. Ca retention percentages of birds fed all Formi NDF diets were higher than of those fed control diet. While, the lowest Ca retention percentages were recorded with birds fed control diets. 16. P retention percentages of birds fed (T3), (T6), (T8)