The Impacts of Lysophospholipd Supplememntation in the Diet on Performance, Carcass Indices, Nutrient Digestibility, Blood Metabolites and Immunity of Broiler Chickens Fed with Different Levels of Threonine

This research was conducted in order to evaluate the use of lysophospholipid (LPL) supplement on performance, carcass characteristics, blood metabolites and nutrient digestibility in broiler chickens fed with different levels of threonine (Thr) amino acid. In this experiment, 400 male broilers of ROSS 308 strain were used with 8 treatments and 5 repetitions in a period of 35 days. The experiment was conducted in the form of a completely randomized design with a factorial arrangement of 4x2 including two levels of LPL in the diet (0 and 0.1%) and four levels of Thr (100, 105, 110 and 115% of requirement). Experimental diets were used for starter (0 to 10 days), grower (11 to 24 days) and finisher (25 to 35 days) phases. The results of this research showed that during the 35-day period, body weight gain and feed conversion ratio improved in broiler chickens fed with LPL supplement (p < 0.05). However, the use of LPL supplement did not have a significant effect on feed intake in broilers. In addition, feed conversion ratio was significantly higher in broilers fed with 100% Thr level compared to higher amounts of Thr requirements (p < 0.05). The use of levels higher than 100% of Thr requirements and LPL supplement in the diet increased the digestibility of crude protein and crude fat in broiler chickens (p < 0.05). The use of LPL supplement increased the serum concentration glucose (p < 0.05). While the level of 105% Thr in the diet caused a significant decrease in serum triglyceride concentration (P < 0.05). Based on the findings of this research, it can be concluded that the use of LPL supplement and levels higher than 100% of Thr requirements in the broiler chicken diet increased the growth performance and nutrient digestibility in broiler chickens.