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Dietary Protein and Energy Effects on Broiler        Live Performance to 42 Days           F. I. L. Hernandez1, D. R. Korv...
The Problem• Story of the fat chicken – Producers were paid  for BW and this resulted in carcasses with high  fat content
Objective•Evaluate the effects of different protein andenergy levels on performance of broilers
Materials and Methods• 3,700 Chicks• 2 x 2 x 3 x 5 factorial experiment   – 2 sexes   – 2 prestarter nutrient densities (H...
Materials and Methods• Parameters measured   – Body weight   – Feed intake   – Carcass yield (breast, wings, legs)• Statis...
Hypothesis• High energy diets increase deposition as fat• High protein diets increase lean meat• Decrease dietary protein ...
Results
Effect of Early Nutrition on BW          4.0          3.8          3.6          3.4          3.2          3.0          2.8...
Effect of ME on 42 d BW          2.7BW (kg)          2.5          2.3                  94.0%                97.0%         ...
Ef fect of DBP on 42 d BW                            a           a             a          2.7                  b          ...
BW (42 d)                 a          2.9BW (kg)          2.7                                   b          2.5          2.3...
Body Weight (42 d)                      Males                                                                 Females     ...
Feed Intake (0 - 42 d)           6100.0                               ab         a          ab                     b      ...
Effect of Energy on Feed Intake           6100           4100Feed (g)           2100           100                      94...
Effect of Sex on Feed Intake to 42 d           6100.0                         a                                           ...
Feed Intake                        Males                                                                     Females      ...
Feed Conversion Ratio (11 to 42d)      2.5                    2.061 a      2.0                              1.915 b      1...
Feed Conversion Ratio (11 to 42d)      2.5                                                      Males                     ...
Effect of Dietary Balance Protein on                                Carcass Yield             2500                        ...
Breast Yield             510                                                           a             500                  ...
Carcass Yield             2500             2000                                                               OtherWeight ...
Carcass Yield             2500                      a        Ev-BW                      b             2000                ...
Effect of Prestarter on Carcass Yield             2500                         a                   b         EBW          ...
Feed Intake to 11 d                400                      341    335                337   326       Males               ...
Nutrient Intakes to 11 d                     100                                  1200                                a   ...
Conclusions• High prestarter increased BW at 42 days  – 2.73 vs 2.66 kg• Breast yield increased with increasing DBP  – 1 g...
Future Research• Maximize carcass value• Predict performance under different nutritional  regimes
Acknowledgments•   Alberta Livestock Industry Development Fund•   Agriculture and Food Council•   Poultry Industry Council...
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Effect of protein and energy on broilers

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Hernandez.Atlanta080107.Mz

  1. 1. Dietary Protein and Energy Effects on Broiler Live Performance to 42 Days F. I. L. Hernandez1, D. R. Korver2, R. A. Renema2, M. J. Zuidhof11 Alberta Agriculture and Food, Agriculture Research Division, AB. Canada2 Agricultural Food and Nutritional Science, University of Alberta, AB. Canada
  2. 2. The Problem• Story of the fat chicken – Producers were paid for BW and this resulted in carcasses with high fat content
  3. 3. Objective•Evaluate the effects of different protein andenergy levels on performance of broilers
  4. 4. Materials and Methods• 3,700 Chicks• 2 x 2 x 3 x 5 factorial experiment – 2 sexes – 2 prestarter nutrient densities (High and Low) • Prestarters were nested within Sex x ME x DBP – 3 levels of metabolizable energy (ME) - 94, 97 and 100 % of COBB recommendations for maximizing growth and FCR – 5 levels of dietary balanced protein (DBP) – 85, 92.5, 100, 107.5 and 115 % of recommendations
  5. 5. Materials and Methods• Parameters measured – Body weight – Feed intake – Carcass yield (breast, wings, legs)• Statistical analysis – Data were analyzed as a four way factorial using the MIXED procedure of SAS (2003)
  6. 6. Hypothesis• High energy diets increase deposition as fat• High protein diets increase lean meat• Decrease dietary protein reduce yield• Decrease dietary protein increase feed intake
  7. 7. Results
  8. 8. Effect of Early Nutrition on BW 4.0 3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4 2.80BW (kg) 2.2 2.0 1.8 2.70 BW (kg) 1.6 1.4 2.60 1.2 1.0 2.50 0.8 High Low 0.6 0.4 0.2 Prestarter 0.0 0 7 11 14 21 28 36 42 49 56 Age (days) PS Level P<0.0001
  9. 9. Effect of ME on 42 d BW 2.7BW (kg) 2.5 2.3 94.0% 97.0% 100.0% Energy (% of recommended) P=0.40
  10. 10. Ef fect of DBP on 42 d BW a a a 2.7 b bBW (kg) 2.5 2.3 85.0% 92.5% 100.0% 107.5% 115.0% Protein (% of recommended) P=0.0005
  11. 11. BW (42 d) a 2.9BW (kg) 2.7 b 2.5 2.3 Males Females Sex P<0.0001
  12. 12. Body Weight (42 d) Males Females Energy (% of recommended) 3.1 2.9BW (kg) 94% 2.7 97% 2.5 100% 2.3 85.0% 92.5% 100.0% 107.5% 115.0% DBP*ME*Sex P=0.003 ME*Sex P=0.025 Protein (% of recommended) DBP*Sex P=0.0003
  13. 13. Feed Intake (0 - 42 d) 6100.0 ab a ab b b 4100.0Feed (g) 2100.0 100.0 85.0% 92.5% 100.0% 107.5% 115.0% Protein (% of recommended) P=0.04
  14. 14. Effect of Energy on Feed Intake 6100 4100Feed (g) 2100 100 94.0% 97.0% 100.0% Energy (% of recommended) P=0.17
  15. 15. Effect of Sex on Feed Intake to 42 d 6100.0 a b 4100.0Feed (g) 2100.0 100.0 Males Females Sex P<0.0001
  16. 16. Feed Intake Males Females Energy (% of recommended) 6100Feed (g) 4100 94% 2100 97% 100% 100 85.0% 115.0% 92.5% 100.0% 107.5% DBP*ME*Sex P=0.027 ME*Sex P=0.849 Protein (% of recommended) DBP*Sex P=0.014
  17. 17. Feed Conversion Ratio (11 to 42d) 2.5 2.061 a 2.0 1.915 b 1.5FCR 1.0 0.5 0.0 Females Sex Males Sex P<0.0001
  18. 18. Feed Conversion Ratio (11 to 42d) 2.5 Males Females abc a ab abcd bcd 2.0 1.5FCR 1.0 0.5 0.0 85.0% 92.5% 100.0% 107.5% 115.0% Protein (% of recommended) Sex*DBP P<0.0650
  19. 19. Effect of Dietary Balance Protein on Carcass Yield 2500 ab a bc bc c EBW 2000 OtherWeight (g) 1500 ab a bc bc c Wings 1000 Legs 500 c bc ab a a Breast 0 85.0% 92.5% 100.0% 107.5% 115.0% Protein (% of recommended) Evis-BW P=0.0076 Wings P<0.0001 Breast P<0.0001
  20. 20. Breast Yield 510 a 500 a abWeight (g) 490 bc c 480 470 460 85.0% 92.5% 100.0% 107.5% 115.0% Protein (% of recommended) P<0.0001
  21. 21. Carcass Yield 2500 2000 OtherWeight (g) 1500 ab b a Wings 1000 Legs 500 a ab b Breast 0 94.0% 97.0% 100.0% Energy (% of recommended) Wings P=0.0860 Breast P=0.0811
  22. 22. Carcass Yield 2500 a Ev-BW b 2000 OtherWeight (g) 1500 1000 b a Wings 500 Legs Breast 0 Females Males Sex Evis-BW P<0.0001 Wings P=0.0018 Breast P=0.0759
  23. 23. Effect of Prestarter on Carcass Yield 2500 a b EBW 2000Weight (g) 1500 1000 Wings Legs 500 Breast 0 High Low Prestarter Evis-BW P=0.0118 Wings P=0.0748 Breast P=0.9251
  24. 24. Feed Intake to 11 d 400 341 335 337 326 Males 300 FemalesFeed (g/bird) 200 100 0 High Low PS P=0.14 Prestarter Sex P=0.09 PS*Sex P=0.66
  25. 25. Nutrient Intakes to 11 d 100 1200 a b 1000 Energy Intake (kcal) 80Protein intake (g) 800 60 a CP b 600 ME 40 400 20 200 0 0 High Low CP ME Prestarter PS <.0001 0.0002 Sex 0.0879 0.0882 PS*Sex 0.6661 0.6586
  26. 26. Conclusions• High prestarter increased BW at 42 days – 2.73 vs 2.66 kg• Breast yield increased with increasing DBP – 1 g of breast meat for every 1.5% increase in DBP• Males were more efficient than females – 1.91 vs 2.06 FCR
  27. 27. Future Research• Maximize carcass value• Predict performance under different nutritional regimes
  28. 28. Acknowledgments• Alberta Livestock Industry Development Fund• Agriculture and Food Council• Poultry Industry Council• University of Alberta• Alberta Agriculture and Food• Cobb-Vantress• Alberta Chicken Producers• Maple Leaf

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