Effect of replacing different level of Crude Protein with Synthetic Amino acids on Growth Performance, Carcass Traits and Nutrient Digestibility in Broilers

Abstract

Present study was conducted with the aim of replacing dietary crude protein (CP) in poultry diet with synthetic essential amino acids and to determine its effect on growth performance, slaughter data and nutrient digestibility in broilers. Five (A, B, C, D and E) iso-caloric & iso-nitrogenous (ME 2850/2950 Kcal/kg; CP 20%/18%) starter and finisher diets were formulated respectively. In both phase diet A was standard diet, in remaining starter/finisher diets (B, C, D and E) CP level was reduced (19/17, 18/16, 17/15 and 16/14) and make them iso-nitrogenous by supplementation of synthetic amino acids. Result showed no significant (P>0.05) effect of replacing CP with synthetic amino acids on all parameters of growth performance of broilers except on feed intake during starter phase. Best FCR during starter (1.33) and finisher (1.67) phase was found in broilers fed on diet B. Similarly, highest (P>0.05) dressing percentage with lowest (P>0.05) abdominal fat was observed in birds fed on diet B while highest (P>0.05) breast meat yield was found in control group. No significant (P>0.05) effect of replacing CP with amino acids was found on nutrient digestibility in both phase, highest digestibility was found in group C (75.50%) and E (79.84%) during starter and finisher phase, respectively. It is concluded that CP of boiler diet can be replaced by synthetic amino acids up to 17 and 15% in start and finisher diet, respectively without compromising the growth performance of broilers.

Effects of Normal and Nano-Capsulated Thyme and Peppermint Essential Oils on Intestinal Morphology and Microbial Population of Broilers Fed on Standard and Low Crude Protein Diets

“…Since protein is an expensive part of the diet and its excretion into the environment causes many environmental problems, in recent years special attention has been paid to reducing the crude protein content of animal rations by responsible institutions and breeders. Since reducing the level of crude protein in poultry rations has adverse effects such as reduces growth, reduces production, weakens the immune system, so this reduction should be in accordance with the criteria and the use of instructions that while achieving the above, animal performance should not be reduced (Shazali et al 2019;UlAbiden et al 2019).…”