Hasan Rouhanipour; Kazem Yussefi Kelarikolaei; seyed davood sharifi; Seyyed Abdollah Hosseini; Hussein Yussefi Kelarikolaei
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 ...
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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.
Kazem Yussefi Kelarikolaei; Hussein Yussefi Kelarikolaei; Hasan Rouhanipour; Seyyed Abdollah Hosseini; Karim Nobari; Mokhtar Mohajer; Parastoo Poorghafoor Langeroodi
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 ...
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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.