Document Type : Research Paper

Authors

• Hasan Rouhanipour ¹
• Kazem Yussefi Kelarikolaei ²
• seyed davood sharifi ³
• Seyyed Abdollah Hosseini ⁴
• Hussein Yussefi Kelarikolaei ⁵

¹ Department of Animal and Poultry Sciences, Faculty of Agricultural Technology, University of Tehran, Pakdasht, Iran. E-mail: hasanrohanipoor74@ut.ac.ir

² Corresponding Author, Animal Science Research Department, Golestan Agricultural and Natural Resources Research and Education Center, AREEO, Gorgan, Iran. E-mail: k.yusefi@areeo.ac.ir

³ Department of Animal and Poultry Sciences, Faculty of Agricultural Technology, University of Tehran, Pakdasht, Iran. E-mail: sdsharifi@ut.ac.ir

⁴ Department of Nutrition and Physiology, Animal Science Research Institute, Karaj, Iran. E-mail: hosseini1355@areeo.ac.ir

⁵ Manager of Babolkenar pure line complex, Babol, Iran. E-mail: hyussefi@yahoo.com

Abstract

Objective: Optimizing the balance between metabolizable energy (ME) intake and expenditure is essential for broiler diet formulation and levels of other dietary nutrients for efficient conversion of feed into muscle mass. The Arian broiler is one of the meat breeds that originated in Iran and given that several decades have passed since the Arian line entered in the Iran; it is necessary to conduct continuous nutritional experiments to more accurately estimate their requirements in terms of improving growth, feed conversion ratio (FCR), carcass efficiency and increasing muscle mass by increasing the density of nutrients such as amino acids (AA). Therefore, the objective of this study was to investigate the effects of dietary energy and AA levels on growth performance and nutrient digestibility of Arian broilers.
Materials and Methods: The effects of dietary energy and AA levels  on growth performance and nutrient digestibility of Arian broiler chickens was investigated with a total of 720 one-day old broiler chicks in a completely randomized design with six treatments, five replicates and 24 birds per each for 42 days. The experimental treatments included T1:control diet (energy and amino acid levels throughout the breeding period accordance with the guidelines for the Arian broiler strain), T2:diet with less energy level during the starter and grower periods and then according to the Arian requairements guide until the end of the period, T3:diet with less energy and amino acid levels during the starter and grower periods and then according to the guide until the end of the period, T4:diet with less energy level during the starter and grower periods and then higher amino acid levels in the finisher period, T5:diet with less energy and amino acid levels in the starter and grower periods and then higher amino acid levels in the finisher period, T6:starter and grower period diet according to the Arian requairements guide and then higher amino acid levels in the finisher period.
Results: The daily weight gain of birds fed T6 increased compared to T3 and T5 (P<0.05). Birds that received T6 had a higher glucose level and lower low-density lipoprotein, compared to the birds that received the control diet (P<0.05). The relative breast weight and production index of birds that were fed T6 increased compared to the birds that fed T1 and T3 (P<0.05).
Conclusion: The economic calculations of the design showed that it is possible to use the advantage of the energy and amino acid levels in the diet of Arian broilers. Overall, feeding a starter and grower period diet according to the Arian requairements guide and then higher amino acid levels in the finisher period which had positive effects on growth performance and economic indicators in Arian broilers, is recommended.

Keywords

• Arian broiler
• Blood Serum Metabolites
• Daily weight gain
• Economic Indicators