by Juliet M. Getty Ph.D. | Feb 27, 2015 | The trace mineral content of most feeds and supplements is provided in terms of parts per million (ppm). A ppm is the same as mg/kg (1 mg is a millionth of a kg). To do calculations, you need to convert lb or oz to kg using the following conversions: 1 lb equals 0.454 kg 1 oz equals 0.0284 kg Example #1: Your hay … [Read more...]