| dc.description | In commercial poultry ration, nutrients are fortified through accumulation of different
feed ingredients furnished with necessary micro nutrients. Protein costs involve about
45 percent of the total feed cost. The daily requirements of dietary protein are
furnished from different animal and plant sources. But the sources of plants are
~ sometimes become harmful for the poultry as because plant sources contain some anti
nutritional factors like phytate phosphorus, trypsin inhibitors, non-starch
polysaccharides (NSP), oligosacchariedes and lections (Deshpande and Cheryan,
1984; NRC, 1994) which decrease feed consumption but increases growth rate and
feed utilization. Phytate phosphorus reduces the phosphorus and calcium availability
in poultry. It is well documented that phosphorus is one of the basic mineral elements
in all feed rations, having a greater influence on biological systems. Feeds of plant
origin protein contain significant amount of this mineral; however, 50-80% of
phosphorus is bound in phytates that cannot be broken down by endogenous enzymes
in poultry (Deshpande and Cheryan, 1984). As a consequence, phosphorous from
plant sources is poorly digested and cannot meet nutritional requirements of poultry
regardless the fact that phytate phosphorus amounts in cereal grains can be as high as
50-80%, in legumes 50-68%, in oil-producing plant seeds and their by-products 51-
76% (Eeckhout and Peape., 1994; Jeroch, 1993 and Oloffs, 2000). | en_US |
| dc.description.abstract | An experiment was conducted to investigate the effect the efficacy of
supplementation of exogenous phytase enzyme on productivity and carcass
characteristics of different strain of commercial broilers at the open sided poultry
shed in Hajee Mohammad Danesh Science and Technology University, Dinajpur.
There were four strains of commercial broiler such as Fast feather, Arbor acres, Cobb500 and Hubbard classic each having 78 number used for the experiment for a period
' of 5 weeks. A total number of 312 day old straight run broiler chicks were
distributed to two dietary treatments i.e. basal diet (Control-To) and basal diet
supplemented with phytase enzyme @ 1gm/kg feed. The results indicated that
broilers given diets supplemented with phytase have enhanced body weight and
weight gain when compared with these fed basal diet (P<0.05). The final body
weight was increased significantly (P<0.01) on T;C (Cobb-500 fed diet with 1g
phytase enzyme/kg feed) and T,F (Fast feather fed diet with 1g phytase
enzyme/kg feed) compared to control. There were significant difference
(P>0.05) among different treatments in relation to feed consumption.
Significant differences (P<0.01) were found in feed conversion ratios among
birds fed on diet treated with phytase enzyme. Feed conversion ratios during
the 5" week of age was 1.88, 1.87, 1.82, 1.86, 1.77, 1.72, 1.75 and 1.70 in ToF,
ToA, ToC, ToH, TiF, T;A, TiC and T,H treatment groups respectively.
Livability was similar in different treatments. Phytase supplementation had no
significant effect on carcass cuts and dressing percent compared to non-phytase
group. Dressing parameters were almost similar in different treatments and the
differences were insignificant among treatment but the dressing weight
percentage, thigh weight percentage and drumstick weight percentage were
significant (P>0.01). Profitable ratios of the phytase groups were always higher
than the control group. The cost of production was the highest in treatment T\F
followed by treatment T)C, ToF, T1A, ToC, ToA, TiH, and ToH. Net profit per
live broiler was the highest in treatment T,;A followed by treatment T,C, TjF,
TH, ToC, ToF, ToA, and ToH respectively. Result of the present study suggests
that the addition of dietary phytage was found to increase production
performance and reduced cost of production. | en_US |
