One-day-old broiler chicks were housed in floor pens in which litter had been treated with 0, 0.9, 3.6, or 7.2 kg of boric acid per 9.9 m2 of floor space. Boron residue levels in brain, kidney, liver, ...

A modern broiler at five weeks old, alongside its ancestor the red jungle fowl at six weeks old (same scale). Bennett et al / Royal Society, Author provided. The speed of growth accelerated in the ...