Effects of Rumen-Protected Methionine Supplementation on Growth Performance, Nutrient Digestion, Nitrogen Utilisation and Plasma Amino Acid Profiles of Liaoning Cashmere Goats

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 control, NC) supplemented with 1, 2 3 g/kg RPM. The RPM quadratically increased average daily gain (ADG) decreased feed ratio (p = 0.001) without affecting final body weight dry matter intake. In particular, compared NC, ADG by 35 g/d < resulted lowest 0.001). apparent total tract digestibility N faecal levels, both linear fashion 0.005). Urinary levels did not have an effect, but retention linearly PRM 0.032). Moreover, urea Met conclusion, can enhance improve growing period, is suggested.