DYNAMICS OF BONES DEVELOPMENT IN EARLY GROWTH OF CHICKENS FED DIETS WITH DIFFERENT AMOUNTS OF CALCIUM AND PHOSPHORUS
Journal Title: Zeszyty Naukowe Uniwersytetu Przyrodniczego we Wrocławiu, Biologia i Hodowla Zwierząt - Year 2011, Vol 583, Issue 0
Abstract
Broiler chickens within 1–28 days post hatch were fed diets containing different amounts of Ca (11 or 9 g/kg) and P-available. (4.5–3.7 g/kg). The dynamics of bone growth, bone metric and mechanical parameters, chemical composition and histological picture were determined. The body weight noted on day 28 post hatch in treatments II (9 g Ca and 3.7 g P-avail./kg) and III (11 g Ca and 3.7 g P-avail./kg) was significantly lower than in treatment I (11 g Ca and 4.5 g P-avail./kg) and IV (9 g Ca; 4.5 g P-avail.). The bone strength evaluated on day 7 and 28 post hatch and elasticity parameters measured on day 28 were significantly lower in chickens of treatment IV. The best chemical composition of whole tibia and its parts was stated only on day 28 in birds from treatment I. In younger ones, the significantly higher bone ash content was found in the same treatment. Analysis of mineral composition of tibia parts in relation to the level of Ca and P-available in diets and lack of significant differences show that it is not depending on the level of these macroelements in feed mixtures. It must be noted that the contents of Ca and P-available as 11 and 4.5 or 11 and 3.7 g/kg diet, was the most beneficial nutritional variant for bone quality and ash content in bone, however without marked changes in Ca and P content in it. Moreover, it should be stated that only one of the applied nutritional variants 9 g Ca and 4.5 g P-available in feed mixture (treatment IV) significantly or insignificantly decreased the bone quality parameters. Response of chicken in early growth phase to the diversified Ca and P level in feed mixtures, determined on the basis of mechanical and metric properties, chemical composition and histological picture of long bone – tibia, indicates the substantial adaptative abilities and ambiguous tends in dynamics of analyzed parameters. Greater, but unclear differences in bone quality parameters among treatments, just from 28 day of chickens life became significant.
Authors and Affiliations
Dorota Jamroz, Tomasz Wertelecki, Jan Kuryszko, Katarzyna Kaleta-Kuratewicz
Keywords
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