Rice expressing lactoferrin and lysozyme has antibiotic-like properties when fed to chicks

Two experiments were conducted to determine whether rice that has been genetically produced to express human lactoferrin (LF) or lysozyme (LZ) protects the intestinal tract similarly to subtherapeutic antibiotics (bacitracin + roxarsone; Antibiotics). Experiment 1 compared 10 corn-soy diets containing 20% of various proportions of LF, LZ or conventional rice (CONV). Chicks fed 5% LF + 10% LZ + 5% CONV had significantly better feed efficiency and thinner lamina propria in the duodenum than those fed 20% CONV. Experiment 2 compared five corn-soy diets containing experimental rice combinations totaling 15% rice. Chicks fed 10% LZ + 5% CONV or 5% LF + 10% LZ had significantly lower feed intake and significantly better feed efficiency than those fed 15% CONV. Chicks fed 10% LZ + 5% CONV, 5% LF + 10% LZ or Antibiotics had significantly greater villous height in the duodenum compared with chicks fed 15% CONV. The lamina propria of the ileum was thinner and contained fewer leukocytes in chicks fed 10% LZ + 5% CONV or Antibiotics compared with those fed 15% CONV. The results from these experiments demonstrate a potential of genetically produced LF and LZ rice to be used as a substitute for antibiotics in broiler diets.