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Effect of Low Protein Diets With Varying Energy to Protein Ratios Supplemented With Limiting Amino Acids on Performance of Broilers

Thesis Info

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Author

Kamran, Zahid

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2010

Thesis Completion Status

Completed

Subject

Applied Sciences

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/858

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676725978178

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Two experiments were conducted to investigate the effect of low crude protein (CP) diets with increased or constant metabolizable energy to crude protein (ME:CP) ratios supplemented with limiting amino acids (AA) on the performance of broilers. Experiment 1 was conducted to study the effect of lowering dietary CP with optimum limiting AA levels on the performance of broilers from 1 to 35 days of age. Four experimental diets were formulated to have four levels of CP as 23, 22, 21 & 20% in starter phase; 22, 21, 20 & 19% in grower phase and 20, 19, 18 & 17% in finisher phase, respectively. All diets were isocaloric within a phase (2925, 3075 & 3125 kcal/kg ME for starter, grower and finisher periods, respectively). Digestible lysine was maintained at 1.10, 1.02 and 0.90% of the diet in starter, grower and finisher periods, respectively. Results showed that the dietary CP level could be reduced without harmful effects on the growth performance, body composition and carcass characteristics when supplemented with limiting AA. Experiment 2 was conducted to determine the effect of low CP diets with constant ME:CP on the performance of broilers from 1 to 35 days of age. Four experimental diets were formulated to have four levels of CP and ME, respectively, in each phase: 23, 22, 21 and 20% CP, with 3036, 2904, 2772 and 2640 kcal/kg in starter phase; 22, 21, 20 and 19% CP, with 3146, 3003, 2860 and 2717 kcal/kg in grower phase; and 20, 19, 18 and 17% CP, with 3100, 2945, 2790 and 2635 kcal/kg in finisher phase. Digestible lysine was maintained at 1.10, 1.02 and 0.90% of the diet in starter, grower and finisher periods, respectively. Results showed that chicks fed low CP diets with constant energy to protein ratio grew slower, used feed less efficiently and retained more fat than chicks fed the control diets even when standard levels of critical AA were maintained in the diets. In conclusion, reducing the dietary CP level provided substantial economic returns without affecting the performance of broilers. However, reduction of dietary CP with constant ME:CP ratio resulted in reduced broiler performance and carcass composition.
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Financial Liberalization and its Impact on Economic Growth of Pakistan

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