Zebu cattle fed dry distiller's grain or cottonseed meal had greater nitrogen utilization efficiency than non-supplemented animals.

Autor: Leite RG; School of Agricultural and Veterinarian Sciences, Campus Jaboticabal, Department of Animal Science, São Paulo State University (Unesp), 14884-900, Jaboticabal, SP, Brazil., Hoffmann A; Trouw Nutrition, 13.080-650, Campinas, SP, Brazil., Romanzini EP; School of Agricultural and Veterinarian Sciences, Campus Jaboticabal, Department of Animal Science, São Paulo State University (Unesp), 14884-900, Jaboticabal, SP, Brazil. elieder.romanzini@gmail.com.; Institute of Animal Husbandry, Department of Animal Production, Federal Rural University of Rio de Janeiro (UFRRJ), 23.897-000, Seropédica, Rio de Janeiro, Brazil. elieder.romanzini@gmail.com., Delevatti LM; School of Agricultural and Veterinarian Sciences, Campus Jaboticabal, Department of Animal Science, São Paulo State University (Unesp), 14884-900, Jaboticabal, SP, Brazil., Ferrari AC; School of Agricultural and Veterinarian Sciences, Campus Jaboticabal, Department of Animal Science, São Paulo State University (Unesp), 14884-900, Jaboticabal, SP, Brazil., Fonseca NVB; School of Agricultural and Veterinarian Sciences, Campus Jaboticabal, Department of Animal Science, São Paulo State University (Unesp), 14884-900, Jaboticabal, SP, Brazil., Barbero RP; Institute of Animal Husbandry, Department of Animal Production, Federal Rural University of Rio de Janeiro (UFRRJ), 23.897-000, Seropédica, Rio de Janeiro, Brazil., Cardoso AS; School of Agricultural and Veterinarian Sciences, Campus Jaboticabal, Department of Animal Science, São Paulo State University (Unesp), 14884-900, Jaboticabal, SP, Brazil., Reis RA; School of Agricultural and Veterinarian Sciences, Campus Jaboticabal, Department of Animal Science, São Paulo State University (Unesp), 14884-900, Jaboticabal, SP, Brazil.
Jazyk: angličtina
Zdroj: Tropical animal health and production [Trop Anim Health Prod] 2022 Feb 28; Vol. 54 (2), pp. 119. Date of Electronic Publication: 2022 Feb 28.
DOI: 10.1007/s11250-022-03126-6
Abstrakt: 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.
(© 2022. The Author(s), under exclusive licence to Springer Nature B.V.)
Databáze: MEDLINE
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