| Full text | |
| Author(s): |
Leite, Rhaony Goncalves
;
Hoffmann, Alvair
;
Romanzini, Elieder Prates
;
Delevatti, Lutti Maneck
;
Ferrari, Adriana Cristina
;
Boas Fonseca, Natalia Vilas
;
Barbero, Rondineli Pavezzi
;
Cardoso, Abmael Silva
;
Reis, Ricardo Andrade
Total Authors: 9
|
| Document type: | Journal article |
| Source: | TROPICAL ANIMAL HEALTH AND PRODUCTION; v. 54, n. 2, p. 10-pg., 2022-04-01. |
| Abstract | |
This study evaluated intake, apparent digestibility, ruminal parameters, nitrogen balance, and microbial protein synthesis in grazing beef cattle fed a mineral mix or combination of two coproducts (cottonseed meal and dried distiller's grains (DDG)) during the wet season. Urochloa brizantha cv. Marandu pastures were managed under continuous stocking to maintain a fixed grazing height of 25 cm using put-and-take methodology. Eight rumen cannulated Nellore steers were used to evaluate the different supplementation strategies. The experiment was composed of four treatments: (1) mineral mixed (MM; ad libitum); (2) energy-protein supplement using corn grain (energy) and cottonseed meal (protein; CS); (3) energy-protein supplement with 50% of the cottonseed meal replaced by DDG (50DDG); and (4) energy-protein supplement with 100% of the cottonseed meal replaced by DDG (100DDG). Except for MM, all supplements were supplied at a level of 0.3% of body weight (BW). A double Latin square was the experimental design performed, with eight cannulated animals, four treatments, across four experimental periods. There was a difference between dry matter and nutrient intake among treatments. The nitrogen balance was different between MM and the other treatments. There was a linear decrease in the rumen ammonia nitrogen levels under CS, 50DDG, and 100DDG. There were no treatment effects on the other parameters evaluated (P >= 0.10). Replacing the protein source in the supplement composition did not affect the metabolic parameters and the microbial protein synthesis. Supplementation at a rate of 0.3% BW, compared to MM supplementation, increased the nitrogen utilization efficiency in grazing cattle. (AU) | |
| FAPESP's process: | 15/16631-5 - Management strategies to reduce environmental impacts of beef cattle production systems |
| Grantee: | Ricardo Andrade Reis |
| Support Opportunities: | Research Program on Global Climate Change - Thematic Grants |
| FAPESP's process: | 17/11274-5 - Decomposition of litter and greenhouse gases emission in Brachiaria grasses with increasing nitrogen fertilizer rates |
| Grantee: | Abmael da Silva Cardoso |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |