Substitution of corn gluten feed and dried citrus pulp for fine ground corn in finishing feedlot rations
Two experiments were conducted at ESALQ/USPs Animal Science Department to evaluate corn gluten feed and dry citrus pulp in substitution for fine ground corn in high concentrate diets for finishing feedlot cattle. In Experiment 1, 88 croosbred (½ Braunvieh ¼ Angus ¼ Nelore) bulls (BW = 407 kg) were kept in 24 pens for 57 days. The rations contained 12% sugarcane bagass and 88% concentrate. The treatments were: (1) fine ground corn (M); (2) fine ground corn and wet corn gluten feed (MFUG); (3) citrus pulp pellets (P); (4) citrus pulp pellets and wet corn gluten feed (PFUG). ADG and G:F ratio did not differ among treatments (P>0,05), but there was an energetic source effect on DMI, higher for corn based diets (P<0,05). No differences were observed for energy souce or corn gluten feed level for NEm and NEg on this experiment (P>0,05), but an interaction (P<0,05) was observed for PFUG wich had higher energy value then the other treatments. In Experiment 2, 99 Nelore bulls (BW = 348 kg) were kept in 20 pens for 85 days. The treatments were: (1) fine ground corn (M); (2) fine ground corn and citrus pulp pellets (MPC); (3) fine ground corn and wet corn gluten feed (MFUG); (4) citrus pulp pellets and wet corn gluten feed (PFUG); (5) citrus pulp pellets and dry corn gluten feed (PFSG). The diets had 5 to 11% grass hay and 89 to 95% concentrate. No differences (P>0,05) were observed for DMI, ADG and G:F ratio among treatments. Diets energy value showed no differences among treatments (P>0,05). Observed/expected NEm and NEg values led to the conclusion that brazilian corn grain has lower energy value than what NRC (1996) tables show. Corn energy values (NEm and NEg was 2,24 and 1,55 Mcal/kg) predicted from fecal starch were similar to american cracked corn and higher than ground corn. Wet corn gluten feed and citrus pulp can be used in substitution for fine ground corn, alone or in combination, in high concentrate finishing feedlot diets, without depressing animal performance and carcass charateristics.
Advisor:Flavio Augusto Portela Santos; Paulo Roberto Leme; Luiz Gustavo Nussio; Flavio Augusto Portela Santos
School:Universidade de São Paulo
Source Type:Master's Thesis
Keywords: Animal performance
Corn gluten feed
Date of Publication:02/16/2009