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Volume 57, issue 1
Arch. Anim. Breed., 57, 34, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Arch. Anim. Breed., 57, 34, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

  14 Nov 2014

14 Nov 2014

Effect of feed form, pellet diameter and enzymes supplementation on growth performance and nutrient digestibility of broiler during days 21-37 of age

Youssef A. Attia1, Walid S. El-Tahawy2, Abd El-Hamid E. Abd El-Hamid2, Antonino Nizza3, Fulvia Bovera3, Mohammed A. Al-Harthi1, and Mahmoud I. El-Kelway4 Youssef A. Attia et al.
  • 1Arid Land Agriculture Department, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia
  • 2Department of Animal and Poultry Production, Faculty of Agriculture, Damanhour University, Damanhour, Egypt
  • 3Department of Veterinary Medicine and Animal Science, University of Napoli Federico II, Italy
  • 4Department of Animal and Poultry Production, Faculty of Agriculture (New Valley), Assiut University, Egypt

Abstract. A total of 420 21-day-old broilers were wing banded and randomly distributed among 60 cages of 7 birds per cage during days 21-37 of age. A factorial design (4×3) was used in which there were four feed forms (mash vs. pellet diet with diameter 2-2 mm, 2-3 mm and 3-3.5 mm, respectively) and three enzyme treatments (unsupplemented, phytase, phytase plus multi-enzyme). Each treatment was replicated 5 times with 7 broilers per replicate. Body weight gain of broilers fed 2-3 mm-diet was significantly greater than that of those fed mash diet and 2-2 mm or 3-3.5 mm pellet-diet. Feed conversion ratio was the best in broilers fed 2-3 mm and 3-3.5 mm pellet-diets. However, feed intake was significantly lower in broilers fed pellet-diets than that of those fed the mash diet. The production index and economic efficiency were significantly higher in groups fed 2-3 mm pellet diameter compared to those fed 2-2 mm and 3-3.5 mm pellet diets. Digestibility of crude protein, ether extract, crude fibre and crude ash were significantly and similarly greater in groups fed pellet diets in comparison with those fed mash diet. Enzyme supplementations significantly and similarly increased growth and production index whereas improved feed conversion ratio and economic efficiency than the control group and this concurred with greater digestibility of crude protein, ether extract and crude ash. However, multi-enzymes plus phytase induced greater effect on the production and economic traits than phytase alone showing synergetic effects. Pellet diet at 2-3 mm supplemented with multi-enzyme plus phytase resulted in the highest performance and nutrient digestibility of broilers during day 20-37 d of age.