Anim Nutr
State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, 100193 Beijing, China.
Published: June 2024
This study investigated the effects of β-alanine (β-Ala) on rumen fermentation, nutrient digestibility, nitrogen (N) metabolism, plasma biochemical parameters, and rumen bacterial communities in beef steers. Six steers with initial liveweight of 252.8 ± 5.2 kg and 3 treatments of supplementing with 0, 30, or 60 g β-Ala per day to basal diet were allocated in a replicated 3 × 3 Latin square design. Each experimental period was 20 d, of which the first 15 d were for adaptation and the subsequent 5 d were for sampling. The results showed that β-Ala linearly increased the ruminal concentration of microbial crude protein (MCP) ( = 0.005), but it did not affect the ruminal concentrations of ammonia N and total volatile fatty acids ( > 0.10). β-Ala also linearly increased the dry matter (DM) ( = 0.009), organic matter (OM) ( = 0.017) and crude protein (CP) ( = 0.043) digestibility, tended to decrease the acid detergent fiber digestibility ( = 0.077), but it did not affect the neutral detergent fiber digestibility ( = 0.641). β-Ala quadratically increased the relative abundance of ruminal Bacteroidota ( = 0.021) at the phylum level, and increased ( = 0.028) and ( = 0.014), and decreased the relative abundance of ( = 0.009) at the genus level. Feeding steers with β-Ala linearly increased the urinary N ( = 0.006), urea excretions ( = 0.002) and the N retention ( = 0.004), but it did not affect the N utilization efficiency ( = 0.120). β-Ala quadratically increased the plasma concentration of the total antioxidant capacity ( = 0.011) and linearly increased the plasma concentration of insulin-like growth factor-1 ( < 0.001). In summary, dietary supplementation with β-Ala improved the rumen MCP supply and increased the digestibility of DM, OM, CP and the N retention. Further research is necessary to verify the ruminal degradability of β-Ala and to investigate the mechanism of the impact of absorbed β-Ala on the anti-oxidative ability in steers.
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http://dx.doi.org/10.1016/j.aninu.2024.02.006 | DOI Listing |
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