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      Editorial: Greenhouse gases mitigation strategies in grazing ruminants

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          Livestock and global change: emerging issues for sustainable food systems.

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            Agriculture: Steps to sustainable livestock.

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              Sustained reduction in methane production from long-term addition of 3-nitrooxypropanol to a beef cattle diet.

              The objective was to evaluate whether long-term addition of 3-nitrooxypropanol (NOP) to a beef cattle diet results in a sustained reduction in enteric CH4 emissions in beef cattle. Eight ruminally cannulated heifers (637 ± 16.2 kg BW) were used in a completely randomized design with 2 treatments: Control (0 g/d of NOP) and NOP (2 g/d of NOP). Treatments were mixed by hand into the total mixed ration (60% forage, DM basis) at feeding time. Feed offered was restricted to 65% of ad libitum DMI (slightly over maintenance energy intake) and provided once per day. The duration of the experiment was 146 d, including an initial 18-d covariate period without NOP use; a 112-d treatment period with NOP addition to the diet, divided into four 28-d time intervals (d 1 to 28, 29 to 56, 57 to 84, and 85 to 112); and a final 16-d recovery period without NOP use. During the covariate period and at the end of each interval and the end of the recovery period, CH4 was measured for 3 d using whole animal metabolic chambers. The concentration of VFA was measured in rumen fluid samples collected 0, 3, and 6 h after feeding, and the microbial population was evaluated using rumen samples collected 3 h after feeding on d 12 of the covariate period, d 22 of each interval within the treatment period, and d 8 of the recovery period. Average DMI for the experiment was 7.04 ± 0.27 kg. Methane emissions were reduced by 59.2% when NOP was used (9.16 vs. 22.46 g/kg DMI; P < 0.01). Total VFA concentrations were not affected (P = 0.12); however, molar proportion of acetate was reduced and that for propionate increased when NOP was added (P < 0.01), which reduced the acetate to propionate ratio (3.0 vs. 4.0; P < 0.01). The total copy number of the 16S rRNA gene of total bacteria was not affected (P = 0.50) by NOP, but the copy number of the 16S rRNA gene of methanogens was reduced (P < 0.01) and the copy number of the 18S rRNA gene of protozoa was increased (P = 0.03). The residual effect of NOP for most of the variables studied was not observed or was minimal during the recovery period. These results demonstrated that the addition of NOP to a diet for beef cattle caused a sustained decrease of methanogenesis, with no sign of adaptation, and that these effects were reversed once NOP addition was discontinued
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                Contributors
                URI : http://loop.frontiersin.org/people/1052656/overviewRole: Role:
                URI : http://loop.frontiersin.org/people/889423/overviewRole: Role:
                URI : http://loop.frontiersin.org/people/86418/overviewRole: Role:
                Journal
                Front Vet Sci
                Front Vet Sci
                Front. Vet. Sci.
                Frontiers in Veterinary Science
                Frontiers Media S.A.
                2297-1769
                16 January 2024
                2024
                : 11
                : 1360276
                Affiliations
                [1] 1Department of Animal Science, University of Wyoming , Laramie, WY, United States
                [2] 2Goiano Federal Institute of Education, Science and Technology (IF Goiano) Campus Rio Verde , Rio Verde, GO, Brazil
                [3] 3Agriculture and Agri-Food Canada , Lethbridge, AB, Canada
                Author notes

                Edited and reviewed by: Domenico Bergero, University of Turin, Italy

                *Correspondence: Paulo de Mello Tavares Lima pdemello@ 123456uwyo.edu
                Article
                10.3389/fvets.2024.1360276
                10824848
                38292463
                8838dee0-c2cc-41da-9e40-01c7cf4723d3
                Copyright © 2024 Lima, Paim and McAllister.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                History
                : 22 December 2023
                : 05 January 2024
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 11, Pages: 3, Words: 1671
                Funding
                The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.
                Categories
                Veterinary Science
                Editorial
                Custom metadata
                Animal Nutrition and Metabolism

                cattle,livestock,methane,sheep,sustainability
                cattle, livestock, methane, sheep, sustainability

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