Effect of surfeit concentratons of vitamin D3 on performance, bone mineralization and mineral retention in commercial broiler chicks
2008
Rao, S.V.R.(Indian Council of Agricultural Research, Hyderabad (India)) | Raju, M.V.L.N. | Panda, A.K. | Saharai, P.N. | Reddy, M.R. | Sunder G.S. | Sharma, R.P.
An experiment was conducted to see the effect of higher concentrations of vitamin Dsub(3) in diets containing sub optimal levels of calcium (Ca) and non-phytate phosphorus (NPP) in broiler chickens. Maize-soybean meal based starter and finisher reference diets (RD) prepared to contain 1.0% and 0.9% Ca, 0.45 and 0.35% NPP, respectively. The RD contained 1200 ICU Dsub(3)/kg. Another basal diet (BD) was prepared to contain 0.4% Ca and 0.2% NPP. The BD was supplemented with Dsub(3) at 4 different concentrations such as 1200, 2400, 4800 and 9600 ICU/kg. Each diet was fed to 11 replicates of 5 chicks each during experimental period of 0 to 6 weeks of age. The body weight gain decreased significantly with reduction in levels of Ca and NPP in diet compared to those fed RD. Supplementation of vitamin Dsub(3) to the low Ca and NPP diet, though improved the weight gain significantly but not at per with RD. The feed efficiency was not affected by concentrations of Ca, NPP and Dsub(3) in diet at 36 d of age. The relative weight of tibia, tibia breaking strength and tibia ash content decreased significantly with reduction in Ca and NPP levels in diet.
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