Growth performance and carcass characteristics of bulls fed tannins associated or not with monensin.

This study aimed to evaluate the effect of tannin (a mix of hydrolyzable and condensed) and its association with monensin on feed efficiency, growth performance, and carcass of bulls fed high-grain diets with 14% and 13% crude protein (). Bulls (64 Nellore and 96 crossbred Angus × Nellore; initial body weight () = 342 ± 25 kg; 20 ± 1 months) were allocated into 20 pens (8 from the same breed per pen). The treatments were T14 - 1.

Effects of monensin source on in vitro rumen fermentation characteristics and performance of beef bulls offered a high-concentrate diet.

In Exp. 1, (11.1 % CP) was inoculated or not with two sources of monensin, resulting in three treatments: 1) no monensin inoculation (CONT), 2) 20 mg of monensin sodium-A/kg of DM (Elanco Animal Health; MON-A), and 3) 20 mg of monensin sodium-B/kg of DM (Shandong Qilu King-Phar Pharmaceutical Co.