Inclusion of Sub-Antarctic Macroalgae (<i>Gigartina skosttsbergii</i>) as Feed Ingredient for Grazing Sheep
Two experiments were carried out to evaluate the inclusion impacts of macroalgae <i>Gigartina skottsbergii</i> (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 (CH<sub>4</su...
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| author | Cinthya Glucevic Navid Ghavipanje Lizbeth E. Robles-Jimenez Sergio Radic-Schilling Manuel Gonzalez Ronquillo |
| author_facet | Cinthya Glucevic Navid Ghavipanje Lizbeth E. Robles-Jimenez Sergio Radic-Schilling Manuel Gonzalez Ronquillo |
| author_sort | Cinthya Glucevic |
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| description | Two experiments were carried out to evaluate the inclusion impacts of macroalgae <i>Gigartina skottsbergii</i> (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 (CH<sub>4</sub>) emission using three fistulated sheep and 96 h incubation of samples. In Exp. 2, ten Dohne Merino ewes [5-year-old; 47 ± 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, <i>p</i> = 0.026) gas production (A), lag time (<i>p</i> = 0.013), and IVDMD (<i>p</i> = 0.071), while it enhanced partition factor (PF96; <i>p</i> = 0.004) and microbial crude protein (MCP) (<i>p</i> = 0.054). The concentration of CH<sub>4</sub> decreased after 3 h (<i>p</i> = 0.0002), 6 h (<i>p</i> = 0.013), and 12 h (<i>p</i> = 0.010) with a tendency at 9 h (<i>p</i> = 0.109) and 24 h (<i>p</i> = 0.068). In Exp. 2, there were no diet effects on the initial BW (IBW, <i>p</i> = 0.77), final BW (FBW, <i>p</i> = 0.91), and average daily gain (ADG, <i>p</i> = 0.24) of ewes; however, Gs supplementation decreased BCS (<i>p</i> = 0.004). Of all blood parameters, only the concentration of glucose (<i>p</i> = 0.021) and albumin (<i>p</i> = 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 CH<sub>4</sub> emission. |
| format | Article |
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| spelling | doaj-art-8ce3ecb5aec24f25b4e9c63639dbdb7e2025-08-20T03:16:42ZengMDPI AGAnimals2076-26152025-07-011513197610.3390/ani15131976Inclusion of Sub-Antarctic Macroalgae (<i>Gigartina skosttsbergii</i>) as Feed Ingredient for Grazing SheepCinthya Glucevic0Navid Ghavipanje1Lizbeth E. Robles-Jimenez2Sergio Radic-Schilling3Manuel Gonzalez Ronquillo4Departamento de Ciencias Agropecuarias y Acuícolas, Universidad de Magallanes, Punta Arenas 6200000, ChileDepartment of Animal Science, Faculty of Agriculture, University of Birjand, Birjand 97175-331, IranLaboratorio de Agroecología, Instituto de Investigaciones en Ecosistemas y Sustentabilidad (IIES), Universidad Nacional Autónoma de México, Morelia 58190, Michoacan, MexicoDepartamento de Ciencias Agropecuarias y Acuícolas, Universidad de Magallanes, Punta Arenas 6200000, ChileDepartamento de Nutricion Animal, Facultad de Medicina Veterinaria y Zootecnia, Universidad Autonoma del Estado de Mexico, Instituto Literario 100 Ote, Toluca 50000, State of Mexico, MexicoTwo experiments were carried out to evaluate the inclusion impacts of macroalgae <i>Gigartina skottsbergii</i> (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 (CH<sub>4</sub>) emission using three fistulated sheep and 96 h incubation of samples. In Exp. 2, ten Dohne Merino ewes [5-year-old; 47 ± 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, <i>p</i> = 0.026) gas production (A), lag time (<i>p</i> = 0.013), and IVDMD (<i>p</i> = 0.071), while it enhanced partition factor (PF96; <i>p</i> = 0.004) and microbial crude protein (MCP) (<i>p</i> = 0.054). The concentration of CH<sub>4</sub> decreased after 3 h (<i>p</i> = 0.0002), 6 h (<i>p</i> = 0.013), and 12 h (<i>p</i> = 0.010) with a tendency at 9 h (<i>p</i> = 0.109) and 24 h (<i>p</i> = 0.068). In Exp. 2, there were no diet effects on the initial BW (IBW, <i>p</i> = 0.77), final BW (FBW, <i>p</i> = 0.91), and average daily gain (ADG, <i>p</i> = 0.24) of ewes; however, Gs supplementation decreased BCS (<i>p</i> = 0.004). Of all blood parameters, only the concentration of glucose (<i>p</i> = 0.021) and albumin (<i>p</i> = 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 CH<sub>4</sub> emission.https://www.mdpi.com/2076-2615/15/13/1976feed supplement<i>Gigartina skottsbergii</i>macroalgaemethanesheep |
| spellingShingle | Cinthya Glucevic Navid Ghavipanje Lizbeth E. Robles-Jimenez Sergio Radic-Schilling Manuel Gonzalez Ronquillo Inclusion of Sub-Antarctic Macroalgae (<i>Gigartina skosttsbergii</i>) as Feed Ingredient for Grazing Sheep Animals feed supplement <i>Gigartina skottsbergii</i> macroalgae methane sheep |
| title | Inclusion of Sub-Antarctic Macroalgae (<i>Gigartina skosttsbergii</i>) as Feed Ingredient for Grazing Sheep |
| title_full | Inclusion of Sub-Antarctic Macroalgae (<i>Gigartina skosttsbergii</i>) as Feed Ingredient for Grazing Sheep |
| title_fullStr | Inclusion of Sub-Antarctic Macroalgae (<i>Gigartina skosttsbergii</i>) as Feed Ingredient for Grazing Sheep |
| title_full_unstemmed | Inclusion of Sub-Antarctic Macroalgae (<i>Gigartina skosttsbergii</i>) as Feed Ingredient for Grazing Sheep |
| title_short | Inclusion of Sub-Antarctic Macroalgae (<i>Gigartina skosttsbergii</i>) as Feed Ingredient for Grazing Sheep |
| title_sort | inclusion of sub antarctic macroalgae i gigartina skosttsbergii i as feed ingredient for grazing sheep |
| topic | feed supplement <i>Gigartina skottsbergii</i> macroalgae methane sheep |
| url | https://www.mdpi.com/2076-2615/15/13/1976 |
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