EFFECT OF ROCK PHOSPHATE WITHOUT AND WITH ALUMINIUM INSTEAD OF DICALCIUM PHOSPHATE ON PERFORMANCE OF GROWING PULLETS
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Authors
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SUNIL NAYAK
Department of Animal Nutrition,
College of Veterinary Science and A.H. Jabalpur (M.P.), India.
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R.P.S. BAGHEL
Department of Animal Nutrition,
College of Veterinary Science and A.H. Jabalpur (M.P.), India.
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ANJU NAYAK
Department of Animal Nutrition,
College of Veterinary Science and A.H. Jabalpur (M.P.), India.
Abstract
ABSTRACT
Dicalcium phosphate (DCP) is used traditionally as phosphorus supplement in poultry
diets. However, due to high demand and scarce availability, its cost is steeply increasing.
Therefore, to reduce the cost of mineral mixture, it has become imperative to use alternate
and economical phosphorus supplement in poultry diet without lowering the production
performance of birds and reducing the cost of their production. One of the alternates is rock
phosphate (RP) which is available in plenty at much lower cost compared to DCP. The
performance of birds on RP varies greatly probably because of large variations in the
fluorine (F) content (205 to 5540 mg/kg) of the diets based on RP. Therefore, this study has
been planned to see the utilization of rock phosphate instead of dicalcium phosphate on the
growth performance of egg type growing chicken. In the experiment, three hundred and
twenty four WLH growing pullets (08 weeks age) were randomly distributed to 27 replicates
of 12 pullets each and were allotted to 9 dietary treatments. Diet one (T1) was control. Diets
2, 4, 6 and 8 (T 2, T4, T6 and T8) were same as T1 except that in these diets DCP was
replaced @ 40%, 60%, 80% and 100% with rock phosphate. While, diets 3, 5, 7 and 9 (T 3,
T5, and T7and T9) were same as T 2, T4, T6 and T8 accept the addition of aluminium at a
ratio of 0.8 Al: 1 F, in those diets. Experiment was conducted for 9-20 weeks (Grower
phase). The overall performance of growers offered RP diets indicated that increase in the
level of RP reduced their performance (weight gain, feed intake, FER and PI), significantly.
However, it was significant when level of RP was increased above 40%. 60% replacement of
DCP with RP supplemented with aluminium sulphate did not influence the weight gain, feed
intake FER and PI and led to better performance in growers. The cost per kg weight gain
has certainly increased due to use of higher levels of RP supplemented with aluminium
sulphate.Hence it was concluded that 40% RP and 60% RP along with aluminium sulphate
was beneficial to replace DCP in the mineral mixture of egg type growers. However,
supplementation of aluminium sulphate to RP was not economical.
Key wards : Alternate phosphorus sources, Aluminium sulphate, Dicalcium phosphate, Egg
type growers, Mineral mixture, Rock phosphate.
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