20th European Symposium on Poultry Nutrition | 24–27 August 2015 | Prague, Czech Republic
P-186 (ID 96)
ADAPTATION TO LOW PHOSPHORUS DIETS IN BROILERS
Mohammad Hossein Shahir (University of Zanjan, Iran), Mohammad Ali Haghparast (University of Zanjan, Iran),
Hamid Reza Taheri (University of Zanjan, Iran), Nima Baradaran (University of Zanjan, Iran)
It has been shown that early phosphorus restrictions in broilers reduce the phosphorus requirement of broilers in subsequent periods. In this experiment, the effects of supplemental inorganic phosphorus withdrawal in the first 5 days post
hatch on subsequent response of Cobb broilers to low phosphorus diet was studied. Two hundred eight male day old
chicks were divided into 4 experimental groups in a 2×2 factorial experiment with four replicates of 13 birds in each.
Experimental groups were: 1 – control (normal phosphorus – 0.5, 0.45 and 0.4% in the starter, grower and finisher periods) 2 – restricted phosphorus (33% reduction of dietary phosphorus in each periods) from day five until the end of the
experiment 3 – adaptation to low phosphorus (0.15%) in the initial 5 days and then normal phosphorus diets and 4 –
adaptation to low phosphorus in the initial 5 days and then restricted phosphorus. The experiment consisted of starter
(0–14 days), grower (15–28 days) and finisher (29–42 days) periods.
Adaptation to low phosphorus increased starter feed intake (P<0.01), starter body weight (P<0.05), phosphorus and
calcium of toe and shank at 42 days of age (P<0.05) and phosphorus retention (P<0.01). Generally the results showed
that early adaptation to low phosphorus diet increase phosphorus retention without negative effects on performance
while phosphorus restriction reduced performance.
Keywords: phosphorus, diet, adaptation, broiler