Effects of taurine on rumen fermentation, nutrient digestion, rumen bacterial community and metabolomics and nitrogen metabolism in beef steers

BACKGROUNDThe objectives of this study were to investigate the effects of taurine on rumen fermentation, rumen bacterial community and metabolomics, nitrogen metabolism and plasma biochemical parameters in beef steers. Six castrated Simmental steers (liveweight 402 +/- 34 kg) and three levels of taurine (0, 20, 40 g d(-1)) were assigned in a replicated 3 x 3 Latin square design. Each experimental period included 15 days for adaptation and 5 days for sampling. RESULTSSupplementing taurine did not affect the ruminal pH or concentrations of ammonia nitrogen and volatile fatty acids (P > 0.10), but linearly increased the ruminal concentrations of taurine (P < 0.001) and microbial crude protein (P = 0.041). Supplementing taurine linearly increased the neutral detergent fiber digestibility (P = 0.018), and tended to linearly increase dry matter digestibility (P = 0.095), tended to increase the fecal nitrogen excretion (P = 0.065) and increased the urinary taurine excretion (P < 0.001). Supplementing taurine quadratically increased the plasma concentration of triglycerides (P = 0.017), tended to linearly decrease growth hormone (P = 0.074), but did not affect other plasma parameters (P > 0.10). Supplementing taurine modified the rumen bacterial community and increased the ruminal concentration of taurine metabolite 2-hydroxyethoxysulfonic acid (P < 0.001). CONCLUSIONIt was concluded that taurine improved ruminal microbial crude protein synthesis and increased fiber digestibility through modifying rumen bacterial community. It is necessary to clarify the ruminal hydrolysis of taurine in steers. (c) 2023 Society of Chemical Industry.

Automated summary

This study investigated the effects of taurine supplementation on rumen fermentation, bacterial community, metabolomics, nitrogen metabolism, and plasma biochemical parameters in beef steers. The results showed that taurine supplementation increased the concentration of taurine and microbial crude protein in the rumen, improved fiber digestibility, and modified the rumen bacterial community. It is necessary to further clarify the hydrolysis of taurine in the rumen of steers.