Abstract
The effect of supplements containing various proportions of degradable intake protein (DIP) and starch on ruminal digestion characteristics of forage-fed beef steers was evaluated. Fluid passage rates, ruminal ammonia (N H), 3 and total volatile fatty acid (VFA) concentrations increased as the amount of supplemental DIP increased. Starch infused at .3% of BW increased molar proportion s of propionate and butyrate and decreased acetate, compared to feeding DIP alone. However, proportions of branched-chain VFA increased with DIP at all levels of starch infusion. Total digestible organic matter intake (TDOMI) was increased with each addition of DIP; however, infusing starch within a DIP level decreased TDOMI. Providing supplemental DIP is more important for improving the use of low-quality, tallgrass-prairie hay than is ruminally available starch.
Highlights
Intake and digestion of low-protein forages by beef cattle are known to increase when supplemental degradab le intake protein (DIP) is fed
Ruminal ammonia (N H), 3 and total volatile fatty acid (VFA) concentrations increased as the amount of supplemental degradable intake protein (DIP) increased
Proportions of branched-chain VFA increased with DIP at all levels of starch infusion
Summary
The effect of supplements containing various proportions of degradable intake protein (DIP) and starch on ruminal dig estion characteristics of forage-fed beef steers was evaluated. Ruminal ammonia (N H3), and total volatile fatty acid (VFA) concentrations increased as the amount of supplemental DIP increased. Starch infused at .3% of BW increase d molar proportion s of propionate and butyrat e and decreased acetate, compared to feeding DIP alone. Proportions of branched-chai n VFA increased with DIP at all levels of starch infusion. Total digestible organic matter intake (TDOMI) was increased with each addition of DIP; infusing starch within a DIP level decreased TDOMI. Providing supplemental DIP is more important for improvin g the use of low-quality, tallgrassprairie hay than is ruminally available starch
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