This study determined the effects of rumen-protected methionine (RPM) supplementation on growth performance, nutrient digestibility, nitrogen (N) utilisation and plasma amino acid profiles Liaoning cashmere goats during fibre growth. Twenty-four yearling male (body weight: 35.41 ± 1.13 kg) were randomly assigned to four dietary treatments: a corn–soybean meal basal diet deficient in (negative c...