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Effect of adding rumen-degradable protein to a dried distillers grain supplement on growth, body composition, blood metabolites, and puberty in yearling Angus and Brangus heifers
- Alava, E.N., DeLucia, A.M., Welchons, C., Hersom, M.J., Yelich, J.V.
- The Professional animal scientists 2017 v.33 no.2 pp. 212-221
- Angus, Brangus, Cynodon dactylon, blood, diet, distillers grains, heifers, intramuscular fat, metabolites, puberty, rump, silage, soybean meal, yearlings
- The objective of the study was to determine whether adding soybean meal (SBM), a source of RDP, to a dried distillers grain (DDG) and bermudagrass round bale silage (RBS) diet would enhance growth, body composition, and onset of puberty in Angus (n = 30; 234 ± 19 kg) and Brangus (n = 30; 252 ± 28 kg) heifers (mean age 259 ± 21 d). On d 0, heifers were assigned to (1) RBS + DDG at 0.75% BW; (2) RBS + DDG at 0.75% BW + SBM at 7.5% of DDG; or (3) RBS + DDG at 0.75% BW + SBM at 15% of DDG for 140 d. There were no treatment or breed (P > 0.05) effects for BW, BCS, or ADG by d 140. Moreover, there were no (P > 0.05) treatment or treatment × breed effects on change in body composition from d 0 to 140 for ultrasound LM area (LMA), LMA as a percentage of BW, LMA intramuscular fat, rib fat, or rump fat. Although, Angus had greater (P ≤ 0.05) LMA intramuscular fat on d 140 than Brangus. Brangus tended (P = 0.08) to have greater rump fat and LMA and greater (P ≤ 0.05) LMA as a percentage of BW than Angus on d 140. Blood metabolites were not different (P > 0.05) among treatments from d 0 to 140. Percentage of heifers pubertal by d 140 were not different (P > 0.05) between treatments. In conclusion, addition of SBM at either 7.5 or 15% of the total DDG supplement had no beneficial effects compared with DDG alone on heifer growth, body composition, or onset of puberty.