| dc.contributor.advisor | Professor Dr. Bikash Chandra Sarker | |
| dc.contributor.advisor | Dr. Mst. Afroza Khatun | |
| dc.contributor.author | PARVEEN, ELARA | |
| dc.date.accessioned | 2022-04-24T05:59:17Z | |
| dc.date.available | 2022-04-24T05:59:17Z | |
| dc.date.issued | 2014-12 | |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/742 | |
| 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). The major
proportion of the phosphorus is stored in a special way: six phosphorus molecules are
bound to phytic acid in a ring form. This phytic acid ring is called phytate. Besides,
phytate creates a large number of insoluble salts with divalent and trivalent cations
such as calcium, magnesium, potassium, Iron, manganese or zinc. The interaction of
protein/phytate and starch/phytate obstructs the digestion of protein and carbohydrates
(Knuckles, 1989; Zyla, 1992). Therefore, just like phosphorus, these valuable
nutritive substances are also lost to animal as excreted in the faeces. Phytic acid also
suppresses the activity of certain enzymes such as a amylase, trypsin, tyrosinase and
pepsin, thereby suppressing crude starch and crude protein digestion (Zyla, 1992). In
order to become P available to broiler chicks, Phosphorous from plant sources must
be hydrolyzed, with phytase as a catalyst, to inositols and inorganic phosphates which
are readily absorbed in digestive tract. Through supplementation of microbial phytase to the monogastric animals about 50% of phytic phosphorous may be released.
Results of numerous experiments have shown that degradation of phytate by phytase
has two-fold positive effect-release of phosphorous and release of minerals. It is the
enzyme known to release the orthophosphate group from the phytate molecule.
Improving the availability of phytate, P would reduce the necessity to include feed
phosphates in the diet and enable a reduction of the dietary P contents, without
jeopardizing the bird’s health and productivity. In turn, this would result in a lower P
excretion per unit of edible product (eggs, meat), and reduce P-linked environmental
pollution problems by intensive livestock production (Kornegay and Ravindran, 1996;
Van, et al., 1997). | 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-T0) 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 T1C (Cobb-500 fed diet with 1g
phytase enzyme/kg feed) and T1F (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 5th week of age was 1.88, 1.87, 1.82, 1.86, 1.77, 1.72, 1.75 and 1.70 in T0F,
T0A, T0C, T0H, T1F, T1A, T1C and T1H 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 T1F
followed by treatment T1C, T0F, T1A, T0C, T0A, T1H, and T0H. Net profit per
live broiler was the highest in treatment T1A followed by treatment T1C, T1F,
T1H, T0C, T0F, T0A, and T0H 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 |
| dc.language.iso | en | en_US |
| dc.publisher | HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR. | en_US |
| dc.subject | Exogenous Phytase Enzyme on Productivity | en_US |
| dc.subject | Effect of phytase on body weight | en_US |
| dc.subject | Preparation of the experimental house | en_US |
| dc.title | Efficacy of Supplementation of Exogenous Phytase Enzyme on Productivity and Carcass Characteristics of Different Strain of Commercial Broilers | en_US |
| dc.type | Thesis | en_US |
