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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Different combinations of sodium monensin and virginiamycin during feedlot finishing of Nellore cattle

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Rigueiro, A. L. N. [1] ; Pereira, M. C. S. [2] ; Squizatti, M. M. [2] ; Ferreira, M. M. [1] ; Donde, S. C. [2] ; Luiz, F. P. [2] ; Silvestre, A. M. [1] ; Muller, L. R. [2] ; Garcia, C. P. [2] ; Bueno, A. P. D. [2] ; Toledo, L. V. [2] ; Estevam, D. D. [2] ; Martins, C. L. [2] ; Arrigoni, M. D. B. [2] ; Millen, D. D. [1]
Total Authors: 15
[1] Sao Paulo State Univ UNESP, Coll Technol & Agr Sci, BR-17900000 Dracena, SP - Brazil
[2] Sao Paulo State Univ UNESP, Sch Vet Med & Anim Sci, BR-18618000 Botucatu, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ANIMAL PRODUCTION SCIENCE; v. 60, n. 8, p. 1061-1072, 2020.
Web of Science Citations: 0

Context The use of two feed additives, to maximise rumen fermentation, in finishing diets offered to feedlot cattle may positively impact performance. Aims This study, conducted at the Sao Paulo State University feedlot, Botucatu campus, Brazil, was designed to evaluate the effects of the combined use of monensin (MON; 30 mg/kg of dry matter; (DM)) and virginiamycin (VM; 25 mg/kg of DM) in high-concentrate diets during the adaptation and finishing periods on feedlot performance, carcass traits, feeding behaviour, blood gas profile, rumen morphometrics and apparent total tract digestibility of nutrients of Nellore cattle. Methods The experiment was designed as a completely randomised block, replicated six times (3 bulls/pen), in which 72 20 months of age yearling Nellore bulls (388.0 +/- 31.1 kg) were fed in 24 pens for 90 days according to the treatments: (1) MON during the entire feeding period (T1), (2) MON + VM during adaptation and only VM during the finishing period (T2), (3) MON + VM during the entire feeding period (T3), and (4) VM during the adaptation and MON + VM during the finishing period (T4). The adaptation program consisted of ad libitum feeding of three diets over the adaptation period of 19 days with concentrate level increasing from 69% to 84% of diet DM. Key results Overall, bulls fed on T2 had a greater DM intake (P < 0.01), final bodyweight (P = 0.04), average daily gain (P = 0.03), hot carcass weight (P < 0.01), final Longissimus muscle area (P = 0.05), Longissimus muscle area daily gain (P = 0.01), improved carcass G:F (P < 0.01) and increased dressing percentage (P < 0.01). Similarly, bulls fed on T2 were faster to consume 1 kg of either DM (P < 0.01) or neutral detergent fibre (P < 0.01) after 60 days on feed. Furthermore, bulls fed on T2 presented a greater (P = 0.05) cell proliferation index in the rumen papillae. Conclusions According to the results, Nellore yearling bulls should be fed high-concentrate diets containing MON and VM during adaptation, and only VM during the finishing period to improve overall feedlot performance. Implications The use of both MON and VM proved to be helpful only during the adaptation period. (AU)

FAPESP's process: 13/25403-0 - Feeding strategies to minimize rumen acidification and improve feedlot performance of Nellore cattle fed high energy diets
Grantee:Mário de Beni Arrigoni
Support Opportunities: Regular Research Grants
FAPESP's process: 13/21672-7 - Protocols for combined use of sodium monensin and virginiamycin in feedlot Nellore cattle diets
Grantee:André Luiz Nagatani Rigueiro
Support Opportunities: Scholarships in Brazil - Master