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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.)

Combining Marandu grass grazing height and supplementation level to optimize growth and productivity of yearling bulls

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Author(s):
Barbero, R. P. [1] ; Malheiros, E. B. [1] ; Araujo, T. L. R. [2] ; Nave, R. L. G. [3] ; Mulliniks, J. T. [4] ; Berchielli, T. T. [2] ; Ruggieri, A. C. [2] ; Reis, R. A. [2]
Total Authors: 8
Affiliation:
[1] UNESP Univ Estadual Paulista, Dept Ciencias Exatas, Fac Ciencias Agr & Vet, BR-14884900 Jaboticabal, SP - Brazil
[2] UNESP Univ Estadual Paulista, Dept Zootecnia, Fac Ciencias Agr & Vet, BR-14884900 Jaboticabal, SP - Brazil
[3] Univ Tennessee, Dept Plant Sci, Knoxville, TN 37996 - USA
[4] Univ Tennessee, Dept Anim Sci, Knoxville, TN 37996 - USA
Total Affiliations: 4
Document type: Journal article
Source: ANIMAL FEED SCIENCE AND TECHNOLOGY; v. 209, p. 110-118, NOV 2015.
Web of Science Citations: 9
Abstract

Two experiments were conducted to determine the effects of grazing height and supplementation levels of Marandu pastures on average daily gain (ADG), gain per hectare (GPH) and methane (CH4) emissions during the wet season under continuous stocking by Nelore yearling bulls. Exp. 1: three grazing heights were evaluated: 15, 25 and 35 cm, combined with 0.3% of BW of a supplement (161 g crude protein (CP)/kg and 20.1 MJ gross energy (GE)/kg on dry matter basis (DMB)). Experimental design was completely randomized (three paddocks per treatment), and the effects were analyzed by polynomial orthogonal contrasts. Exp. 2: grazing heights were combined with decreasing supplementation levels as grazing heights increased: short height (15 cm) and high supplementation (0.6% of BW of a supplement: 142 g CF/kg and 18.9 MJ GE/kg on DMB) (SHHS); moderate height (25 cm) and moderate supplementation (0.3% of BW of a supplement: 161 g CP/kg and 20.1 MJ GE/kg on DMB) (MHMS) or tall height (35 cm) without supplementation) (THWS). Experimental design was completely randomized (three paddocks per treatment), and treatment means were compared by Tukey test (P<0.05). In Exp. 1, ADG increased linearly (P=0.02), and GPH decreased linearly (P=0.0002) as grazing height increased. Methane emission was not affected (P=0.64) by grazing height. In Exp. 2, ADG was not influenced (P=0.14) by treatments. However, GPH was the greatest (P<0.0001) for the SHHS treatment. In addition, CH4 emissions were lower (P<0.0001) in SHHS and MHMS bulls compared to THWS. The SHHS can improve the GPH without decreasing the ADG of each individual animal. Optimizing supplementation level according to grazing pressure may improve the nutrition efficiency on beef cattle production by decreasing the CH4/ADG and MJ CH4/MJ metabolizable energy intake. (C) 2015 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 13/25202-5 - Effect of diet and forage species on the metabolic profile of ruminants
Grantee:Rondineli Pavezzi Barbero
Support type: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 12/20264-0 - Productive, environmental and economic impacts of strategies supplementation in beef cattle diet under grazing heights and finishing strategies
Grantee:Ricardo Andrade Reis
Support type: Regular Research Grants
FAPESP's process: 11/00060-8 - GHG full account and mitigation strategies in Brachiaria pastures submitted to different management
Grantee:Telma Teresinha Berchielli
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/14956-6 - Impacts productive, environmental and economic of the supplementation strategies of the diet of beef cattle under grazing heights and termination strategies
Grantee:Rondineli Pavezzi Barbero
Support type: Scholarships in Brazil - Doctorate