Methane Emissions, Performance and Carcass Characteristics of Different Lines of Beef Steers Reared on Pasture and Finished in Feedlot

A - Papers appearing in refereed journals

Meo-Filho, P., Berndt, A., Marcondes, C. R., Pedroso, A. F., Sakamoto, L.S., Boas, D. F. V., Rodrigues, P. H. M., Rivero, M. J. and Bueno, I. C. S. 2020. Methane Emissions, Performance and Carcass Characteristics of Different Lines of Beef Steers Reared on Pasture and Finished in Feedlot. Animals. 10 (2), p. 303. https://doi.org/10.3390/ani10020303

AuthorsMeo-Filho, P., Berndt, A., Marcondes, C. R., Pedroso, A. F., Sakamoto, L.S., Boas, D. F. V., Rodrigues, P. H. M., Rivero, M. J. and Bueno, I. C. S.
Abstract

The present study aimed to investigate whether different lines of a composite breed (5/8 Charolais × 3/8 Zebu), formed at different times, and genetically improved, would result in differences in animal performance, enteric methane emissions, and carcass traits. Forty-six Canchim steers (15 months, 280 ± 33 kg liveweight) from three different lines were used: old, new, and theircross. These three breed lines were considered the treatments (arranged in four randomized blocks Based on initial liveweight) and were evaluated under grazing and feedlot conditions in relation to the performance and emission of enteric methane. During the grazing period, the new line wasfound to be superior to the old only in relation to the average daily liveweight gain (0.692 vs. 0.547 kg/day), and with no differences in relation to the cross line (0.692 vs. 0.620). In the feedlot finishing phase, only the average daily liveweight gain was significantly higher in the new line compared to the cross and old line (1.44 vs. 1.32 and 1.23 kg/day). The new and cross lines demonstrated higher dry matter intake when compared to the old line (10.25 and 10.42 vs. 9.11 kg/day), with the crossline animals demonstrating the best feed conversion. The new line showed higher enteric methane emissions compared to the old line (178 vs. 156 g/day). The line had an effect on the carcass dressing of the animals, with greater fat thickness in carcasses from the new and cross lines than the old line (4.4 and 3.8 vs. 3.2 mm). Canchim cattle selected for improved productive performance characteristics does not guarantee animals with lower methane emissions under grazing conditions; while in feedlots, can lead to increased daily feed consumption, and hence, to higher emissions of methane.

KeywordsBeef cattle; Genetics; Greenhouse gases; Growth performance; Nutrition
Year of Publication2020
JournalAnimals
Journal citation10 (2), p. 303
Digital Object Identifier (DOI)https://doi.org/10.3390/ani10020303
Open accessPublished as ‘gold’ (paid) open access
FunderBrazilian Corporation of Agricultural Research (EMBRAPA)
Biotechnology and Biological Sciences Research Council
Funder project or codeS2N - Soil to Nutrition - Work package 2 (WP2) - Adaptive management systems for improved efficiency and nutritional quality
Publisher's version
Output statusPublished
Publication dates
Online13 Feb 2020
Publication process dates
Accepted07 Feb 2020
PublisherMDPI
ISSN2076-2615

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