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- Title
Nitrogenous compounds in suckling beef calves supplemented with different levels of protein and fed forage tropical.
- Authors
Sotelo Moreno, Deilen P.; Maza Ortega, Román E.; Rocha Manso, Marcos
- Abstract
Background: the pastures dietary and metabolic imbalance affects the protein:energy ratio since there will be protein deficiency or relative excess of energy, conditioning the use of nutrients and animal performance. Objective: the aim of this study was to evaluate the effects of supplementation with different protein levels on in suckling beef calves. Methods: fifty suckling Nellore calves with average initial body weight (BW) of 114 ± 2.4 kg and 105 ± 3.0 days age were used and distributed in a completely randomized design with two supplementation treatments: Low protein (LOW) and High protein (HIGH). The supplements were composed of soybean meal, cornmeal, wheat meal, mineral mix, and molasses, containing 150 g CP/kg DM and 300 g CP/kg dry matter (DM) for LOW and HIGH respectively, and provided in amounts of 6 g/kg BW. The animals underwent 78 experimental days, and were kept in eight 5 hectares paddocks each, formed by Brachiaria decumbens and equipped with drinkers and feeders. On the day 47th experiment, urine samples were collected four hours before and after supplement intake to quantify synthesis of microbial nitrogenous compounds in the rumen (MICN, efficiency of microbial protein synthesis (EMS) urine urea nitrogen (UUN), nitrogen urinary excretion (NUE), nitrogen fecal excretion (NFE), nitrogen balance (NB), and efficiency of nitrogen utilization (ENU). Likewise, blood samples were collected to quantify the serum urea nitrogen (SUN) concentrations Data were submitted to an analysis of variance, and significance was considered at p ≤ 0.10. Results: the MICN (16.1 vs 15.9 g/d), MICNR (0.22 vs 0.18 g/g), EMS (49.2 vs 47.7 g/kg), NFE (21.2 vs 21.8 g/d), NB (30.5 vs 32.5 g/d), and ENU (0.40 vs 0.36 g/g) showed no difference (p > 0.10) between the treatments. However, animals receiving a higher CP level presented greater SUN (LOW = 10.2 vs HIGH = 15.7 mg/dL), UUN (LOW = 16.3 vs HIGH = 26.4 g/d), and NUE (LOW = 24.7 vs HIGH = 34.7 g/d) concentrations (p < 0.10). Conclusions: Supplying up to 300 g CP/kg DM does not increase the synthesis or use of nitrogenous compounds in suckling beef calves fed tropical forage.
- Subjects
CALVES; MICROBIOLOGICAL synthesis; NITROGEN excretion; SOYBEAN meal; PROTEIN deficiency; BEEF
- Publication
Revista Colombiana de Ciencias Pecuarias, 2024, Vol 37, p90
- ISSN
0120-0690
- Publication type
Article