Document Type : Research Paper

Authors

1 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

2 Babolkenar pure line complex, State Livestock Affir Logestic Company, Ministry of Jihad-e Agriculture, Babol, Iran. E-mail: hyussefi@yahoo.com

3 Department of Animal and Poultry Nutrition, Faculty of Animal Sciences Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran. E-mail: rouhanipour_s99@gau.ac.ir

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

5 Animal Science Research Department, Golestan Agricultural and Natural Resources Research and Education Center, AREEO, Gorgan, Iran. K.nobari@areeo.ac.ir

6 Animal Science Research Department, Golestan Agricultural and Natural Resources Research and Education Center, AREEO, Gorgan, Iran. m.mohajer@areeo.ac.ir

7 Animal Science Research Department, Golestan Agricultural and Natural Resources Research and Education Center, AREEO, Gorgan, Iran. p.poorghafoor@areeo.ac.ir

10.22059/jap.2024.372711.623781

Abstract

Introduction: In the past, the use of valine (L-Val) in broiler feeds was limited due to its high price and relatively low availability. However, L-Val is becoming more available for the feed industry, resulting in a more viable price, leading to its inclusion in feed formulas. Moreover, to decrease the dietary content of crude protein, the use of L-Val in broiler diets is becoming more attractive. Arian broiler is one of the meat strains that originated in Iran and considering that several decades have passed since the arrival of the Arian line in our country. Therefore, it is necessary to carry out continuous nutritional experiments to more accurately meet the requirement of Arian broiler with regard to optimizing growth, feed conversion ratio (FCR), and carcass efficiency by increasing the density of nutrients such as amino acids (AA). Therefore, the objective of this study was to investigate the effects of different ratios of dietary valine-to lysine on growth performance, blood parameters, immune system, carcass characteristics and economic indicators in Arian broiler chickens.
Materials and Methods: This experiment was conducted for 40 days with three satges: starter (0-14 days old), growth (15-25 days old) and finisher (26-40 days old). In this study, a total of 500 Arian strain day old broiler chicks were used in a completely randomized design with five treatments, five replicates and 20 birds per each. Feed intake and body weight were measured at the end of each rearing periods and FCR was calculated. The experimental groups included: first group: control (-75; 75% ratio of valine to lysine without using synthetic L-Val), second group: +80 (ratio of 80% valine to lysine using synthetic L-Val), third group: +85 (ratio of 85% valine to lysine using synthetic L-Val), fourth group: -80 (ratio of 80% valine to lysine without using synthetic L-Val and fifth group: -85 (ratio of 85% valine to lysine without using synthetic L-Val). At 40 days of age, six birds from each replicate were randomly selected, weighed, and killed).
Results and Disscution: Results showed that diets with ratios of -80 and -85% valine amino acid increased body weight at the age of 0 to 42 days (P<0.05). The diets with a ratios of -85% valine amino acid increased feed intake during the total period of experiment (P<0.05). The intake of diets with ratios of -80 and -85% valine amino acid improved FCR and decreased abdominal fat (P<0.05). The level of albumen and total protein in control treatment were higher than in all experimental groups (P<0.05). Significant differences were not observed in relative size of spleen and bursa of fabricius, antibody titer against Newcastle disease and heterophile to lymphocyte ratio between experimental groups.
Conclusion: The results showed that feeding a diet containing -85% valine amino acid was more obvious on performance in the entire rearing periods, and also will improve serum lipid parameters, reduce fat storage in the abdominal area and increase profitability. Finally, the economic calculations of the project showed that it is possible to use the advantage of using synthetic valine amino acid in ration of Arian broilers.

Keywords

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