Effect of low dietary phosphorus on carcass characteristics and cost economics of broiler production
2013
Lalpanmawia, H. | Sridhar, Manpal | Sreejaajith, | Shet, Divya | Elangovan, A.V.
A study was conducted with a total of 192 day old broiler chicks divided into four dietary treatments consisting of one positive control group, Group T1 without any phytase enzyme (0.45% available P during starter and 0.40% during finisher phase), one negative control group, Group T2 (0.32% available P during starter and 0.28% during finisher phase) and two treatments with negative control diets, supplemented with two different enzymes, Group T3 (laboratory produced phytase) and Group T4 (commercial phytase) to meet the phosphorus requirements. Each treatment had six replicates with eight chicks in each replicate. Experimental duration was of 5 weeks. The body weight of chicks at 5wk of age was significantly higher (P<0.001) in positive control and commercial phytase supplemented group than lab phytase group followed by least in negative control group. The performance index was also significantly lower (P<0.001) in the negative control group. The carcass traits were recorded at the end of the feeding trial. The eviscerated and edible yield of the carcass was significantly higher (P<0.001) in both T1 and T4 than T2 and T3 and the same pattern was observed in case of breast and thigh yield. There was no significant difference (P>0.05) observed among different treatments in case of drumstick weight, gizzard, giblet, intestinal and caecal weight. The results indicated that optimum dietary phosphorus level is essential for higher edible and breast yield with lower cost of production.
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