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- Title
Effects of Rumen-Protected Methionine Supplementation on Growth Performance, Nutrient Digestion, Nitrogen Utilisation and Plasma Amino Acid Profiles of Liaoning Cashmere Goats.
- Authors
Wang, Wennan; Ye, Lisha; Dou, Xingtang; Liu, Haiying; Han, Di
- Abstract
Simple Summary: Dietary methionine deficiency can limit the body growth and cashmere production of cashmere goats, leading to excessive nitrogen (N) excretion. This study demonstrated that rumen-protected methionine supplementation improved the growth performance of cashmere goats and reduced their manure N excretions and plasma urea N levels during the seasonal growth of cashmere fibres. The formulation of diets supplemented with rumen-protected methionine can enhance the utilisation of N and maximise the production capacity of cashmere goats. This study determined the effects of rumen-protected methionine (RPM) supplementation on the growth performance, nutrient digestibility, nitrogen (N) utilisation and plasma amino acid profiles of Liaoning cashmere goats during cashmere fibre growth. Twenty-four yearling male cashmere goats (body weight: 35.41 ± 1.13 kg) were randomly assigned to four dietary treatments: a corn–soybean meal basal diet deficient in methionine (negative control, NC) and a basal diet supplemented with 1, 2 and 3 g/kg of RPM. The RPM supplementation quadratically increased the average daily gain (ADG) and decreased the feed to gain ratio (p = 0.001) without affecting the final body weight and dry matter intake. In particular, compared to NC, 2 g/kg RPM supplementation increased the ADG by 35 g/d (p < 0.001) and resulted in the lowest feed to gain ratio (p < 0.001). RPM increased the apparent total tract digestibility of N and decreased the faecal N levels, both in a linear fashion (p = 0.005). Urinary N levels did not have an effect, but the N retention levels increased linearly with PRM (p = 0.032). Moreover, the RPM decreased the plasma urea N levels (p < 0.001) and increased the plasma Met levels quadratically (p < 0.001). In conclusion, RPM supplementation in the diet of cashmere goats can enhance the utilisation of N and improve ADG during the cashmere fibre growing period, and 2 g/kg of RPM in the diet is suggested.
- Subjects
LIAONING Sheng (China); NITROGEN plasmas; AMINO acids; METHIONINE; CORN as feed; CASHMERE; GOATS
- Publication
Animals (2076-2615), 2023, Vol 13, Issue 19, p2995
- ISSN
2076-2615
- Publication type
Article
- DOI
10.3390/ani13192995