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Influence Of microbial Phytase On Nutrient Utilization In Broilers
An eight week feeding trial usmg 180 day-old broiler chicks was conducted to study the influence of phytase supplementation (NatuphosR-5000) on nutrient utilization and subsequent performance. Treatments involved a standard broiler diet, a low available phosphorus (LAP) diet and the low available...
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| Médium: | Ph.D Thesis |
| Jazyk: | Undetermined |
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Mannuthy
Department of Poultry Science, College of Veterinary and Animal Sciences
2000
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| 100 | |a Balasubramanian D | ||
| 245 | |a Influence Of microbial Phytase On Nutrient Utilization In Broilers | ||
| 260 | |a Mannuthy |b Department of Poultry Science, College of Veterinary and Animal Sciences |c 2000 | ||
| 502 | |b MVSc | ||
| 520 | 3 | |a An eight week feeding trial usmg 180 day-old broiler chicks was conducted to study the influence of phytase supplementation (NatuphosR-5000) on nutrient utilization and subsequent performance. Treatments involved a standard broiler diet, a low available phosphorus (LAP) diet and the low available phosphorus diet plus graded levels of phytase at the rate of 500, 750 and 1000 units / kg diet. The groups fed standard broiler diet and low available phosphorus diets supplemented with 750 and 1000 units phytase showed significantly (P<O.OI) higher body weight and weight gain. The cumulative feed intake was statistically comparable among the experimental diets at sixth week, whereas, at eighth week it was significantly (P<0.05) lower in LAP diet without phytase than . that of other diets. The feed conversion ratio was significantly (P<0.0l) improved by the addition of phytase at 750 and 1000 units / kg in comparison to low available phosphorus diet. Graded levels of phytase addition linearly improved nitrogen retention while energy retention was significantly (P<O.Ol) higher in groups fed 750 and 1000 units of phytase / kg. The addition of 750 and 1000 units of phytase / kg diet significantly (P<O.OI) increased the availability of calcium while phosphorus availability was improved by all levels of enzyme 500, 750 and 1000 units / kg. The excretion of phosphorus was significantly (P<O.Ol) reduced in enzyme supplemented groups. The availability of manganese and zinc was significantly more in enzyme supplemented groups. Tibial ash, serum calcium and serum inorganic phosphorus were significantly (P<0.01) increased by the addition of 750 and 1000 units of dietary phytase / kg both at sixth and eighth week of age. The serum alkaline phosphatase level was significantly (P<O.Ol) decreased in the diets supplemented with phytase. Supplementation of phytase had no effect on per cent dressed yield and gib let yield. The per cent R-to-C yield was significantly (P<0.05) higher in groups fed standard diet, LAP diet and 500 units phytase supplemented diet at sixth week. Whereas at eighth week it was significantly (P<0.05) higher in groups fed standard diet and 1000 units phytase added diet. The livability was not influenced by dietary phytase and available phosphorus levels. The net profit per kg live weight at eighth week was 29, 94 and 85 paise higher in groups fed 500, 750 and 1000 units of phytase, respectively in comparison to LAP diet. The results suggested that supplementation of 750 units of phytase per kg in low available phosphorus diets is advantageous for commercial broiler chicken production. | |
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| 952 | |0 0 |1 0 |2 ddc |4 0 |6 636_500000000000000_BALIN |7 0 |9 34764 |a KAUCLV |b KAUCLV |c THESES |d 2014-03-18 |o 636.5 BAL/IN |p 171819 |r 2014-03-18 |w 2014-03-18 |y TH | ||