The impact of supplementation withRhagodia preissiiandAtriplex nummulariaon wool production, mineral balance and enteric methane emissions of Merino sheep
| Autor: | Paul Young, J. Speijers, J. K. Hendry, Elizabeth Hulm, Hayley C. Norman, M. G. Wilmot, X. Li |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Nitrogen balance Rhagodia Phosphorus 0402 animal and dairy science food and beverages chemistry.chemical_element 04 agricultural and veterinary sciences Management Monitoring Policy and Law Biology biology.organism_classification 040201 dairy & animal science Agronomy chemistry Atriplex nummularia Wool Grazing 040103 agronomy & agriculture Hay 0401 agriculture forestry and fisheries Organic matter Agronomy and Crop Science |
| Zdroj: | Grass and Forage Science. 73:381-391 |
| ISSN: | 0142-5242 |
| Popis: | The Australian perennial shrubs, oldman saltbush (Atriplex nummularia) and rhagodia (Rhagodia preissii), can complement the diets of sheep grazing moderate-quality cereal residues. We compared liveweight change, organic matter digestibility, nitrogen and mineral balance, wool growth and methane emissions of Merino wethers offered oaten hay (OMD 622 g kg−1 DM; N 9.74 g kg−1 DM) with and without shrub biomass (substituted at 25% of OM). Diets were fed at restricted levels for 1 month. Substituting hay with shrub biomass significantly decreased liveweight loss, increased clean wool growth and increased apparent absorption of phosphorus compared to the hay alone. Substitution of hay with both saltbush and rhagodia led to over 23% greater clean wool growth. Nitrogen balance and apparent digestion of organic matter, calcium and magnesium did not vary significantly between animals on the diets. Wethers on the rhagodia and hay diets had similar enteric methane emissions, while animals offered the saltbush diet had significantly higher emissions (L/OM intake). When methane is expressed in terms of wool growth, animals on the rhagodia diet produced 26% less methane for every gram of wool. |
| Databáze: | OpenAIRE |
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