{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T18:42:27Z","timestamp":1760035347188,"version":"build-2065373602"},"reference-count":75,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2025,7,4]],"date-time":"2025-07-04T00:00:00Z","timestamp":1751587200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Universidad de Magallanes","award":["MEC 80190113","20357"],"award-info":[{"award-number":["MEC 80190113","20357"]}]},{"name":"Universidad Autonoma del Estado de Mexico","award":["MEC 80190113","20357"],"award-info":[{"award-number":["MEC 80190113","20357"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Animals"],"abstract":"<jats:p>Two experiments were carried out to evaluate the inclusion impacts of macroalgae Gigartina skottsbergii (Gs) for grazing sheep. Experiment (Exp.) 1 studied the effect of Gs on in vitro gas production (IVGP), dry matter (DM) digestibility (IVDMD), and methane (CH4) emission using three fistulated sheep and 96 h incubation of samples. In Exp. 2, ten Dohne Merino ewes [5-year-old; 47 \u00b1 0.14 kg body weight (BW)] were randomly assigned to dietary treatments supplemented with Gs at 0 or 450 g DM\/d per animal. The study lasted 31 days and was preceded by an adaptation period of 9 days. The BW, body conditional score (BCS), and blood were sampled at the first and the last day of the trial. The results of Exp. 1 showed that Gs supplementation reduced (MCP, p = 0.026) gas production (A), lag time (p = 0.013), and IVDMD (p = 0.071), while it enhanced partition factor (PF96; p = 0.004) and microbial crude protein (MCP) (p = 0.054). The concentration of CH4 decreased after 3 h (p = 0.0002), 6 h (p = 0.013), and 12 h (p = 0.010) with a tendency at 9 h (p = 0.109) and 24 h (p = 0.068). In Exp. 2, there were no diet effects on the initial BW (IBW, p = 0.77), final BW (FBW, p = 0.91), and average daily gain (ADG, p = 0.24) of ewes; however, Gs supplementation decreased BCS (p = 0.004). Of all blood parameters, only the concentration of glucose (p = 0.021) and albumin (p = 0.011) decreased in the Gs group. Overall, our results revealed that the dietary inclusion of Gs (at 450 g DM\/d) affected neither the BW nor ADG of ewes; however, Gs was accompanied by lesser IVGP and CH4 emission.<\/jats:p>","DOI":"10.3390\/ani15131976","type":"journal-article","created":{"date-parts":[[2025,7,7]],"date-time":"2025-07-07T02:53:07Z","timestamp":1751856787000},"page":"1976","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Inclusion of Sub-Antarctic Macroalgae (Gigartina skosttsbergii) as Feed Ingredient for Grazing Sheep"],"prefix":"10.3390","volume":"15","author":[{"given":"Cinthya","family":"Glucevic","sequence":"first","affiliation":[{"name":"Departamento de Ciencias Agropecuarias y Acu\u00edcolas, Universidad de Magallanes, Punta Arenas 6200000, Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7819-0527","authenticated-orcid":false,"given":"Navid","family":"Ghavipanje","sequence":"additional","affiliation":[{"name":"Department of Animal Science, Faculty of Agriculture, University of Birjand, Birjand 97175-331, Iran"},{"name":"South Khorasan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Birjand 9735197311, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3385-7177","authenticated-orcid":false,"given":"Lizbeth E.","family":"Robles-Jimenez","sequence":"additional","affiliation":[{"name":"Laboratorio de Agroecolog\u00eda, Instituto de Investigaciones en Ecosistemas y Sustentabilidad (IIES), Universidad Nacional Aut\u00f3noma de M\u00e9xico, Morelia 58190, Michoacan, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sergio","family":"Radic-Schilling","sequence":"additional","affiliation":[{"name":"Departamento de Ciencias Agropecuarias y Acu\u00edcolas, Universidad de Magallanes, Punta Arenas 6200000, Chile"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3616-4157","authenticated-orcid":false,"given":"Manuel","family":"Gonzalez Ronquillo","sequence":"additional","affiliation":[{"name":"Departamento de Nutricion Animal, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autonoma del Estado de Mexico, Instituto Literario 100 Ote, Toluca 50000, State of Mexico, Mexico"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,7,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Holka, M., Kowalska, J., and Jakubowska, M. 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