Evaluation of Differences Between Strains and Commercial Feed on Production Performance, Relative Weight of Immune Organs, Immune Profile, and Blood Profile of Broiler

To determine the effect of strain differences on broiler production performance (feed consumption, Feed Conversion Ratio (FCR), weight of immune organs (thymus and spleen), immune profile (CD4+ and CD8+), and blood profile (red blood cells) of broilers. This study used two broiler strains (Strain A1 and A2), with Day Old Chicks (DOC) and a total of 96 DOC in the strain. The maintenance period was 35 days. Treatment was given using three brands of commercial feed (PT. B1, PT. B2, and PT. B3). This study used a Completely Randomized Block Design (CRBD) with a 2x3 factorial pattern consisting of 6 treatments and 4 replications. The interaction of strain differences and different commercial feeds gave significantly different results (P>0.05) on feed consumption variables, and feed conversion (FCR). The interaction between strains and different commercial feeds gave very significant results (P>0.01) on CD 4+ and CD 8+ variables it can be concluded that different strain treatments have not been able to optimize all variables. This is because there are other factors that can affect variables such as the same environmental conditions in the maintenance phase, The treatment of giving different types of commercial feed gave significantly different results (P>0.05) on the variables of feed consumption and feed conversion (FCR), and The interaction between different strains and commercial feed gave results that had a very significant effect (P>0.01) on the CD 4+ and CD 8+ variables. The interaction between strains and feeds can increase cytotoxic T cells or cells that play a role in maintaining long-term protective immunity against bacterial infections.