Effects of extruded linseed on methane emission and milk production of dairy cows
The agriculture sector is one of the major sources to produce greenhouse gases of today. One big contributor is methane (CH4) generated during rumen digestion of the feed carbohydrates. One approach to lower CH4 output from the agriculture sector, is to change the diet for the cows. Diets with extru...
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| Formato: | H2 |
| Lenguaje: | Inglés sueco |
| Publicado: |
SLU/Dept. of Animal Nutrition and Management (until 231231)
2019
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| Materias: |
| _version_ | 1855572417381924864 |
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| author | Blomdahl, Stina |
| author_browse | Blomdahl, Stina |
| author_facet | Blomdahl, Stina |
| author_sort | Blomdahl, Stina |
| collection | Epsilon Archive for Student Projects |
| description | The agriculture sector is one of the major sources to produce greenhouse gases of today. One big contributor is methane (CH4) generated during rumen digestion of the feed carbohydrates. One approach to lower CH4 output from the agriculture sector, is to change the diet for the cows. Diets with extruded linseed (EL) have in earlier studies showed to have a lowering effect on CH4 output from cows. Previous studies have shown correlations between CH4 output and fatty acid (FA) profile of milkfat. EL has also shown in previous studies to influence the FA profile in milkfat. The objects of this study were to evaluate if CH4 output can be reduced if diets are supplemented with extruded linseed, if CH4 increases the concentration of unsaturated FA in milk fat, and the effect of EL on milk yield.
In this study a total of 177 cows from five herds were individually scanned for CH4 output, milk fatty acid profile and milk yield. Cows were studied while fed a control diet, during the treatment diet with EL and when going back to the control diet again. EL diets had no effect on milk yield but increased the unsaturated FA in the milk. EL also decreased the CH4 output from the cows with 22% from the first control period to the treatment diet, however there was no increase of CH4 output between treatment period and second control period. Conclusion of this master thesis is that Extruded linseed did not affect the milk yield. EL had an effect on milk fat composition. Due to the unreliable measuring method of methane this study could not point out an obvious decrease of CH4 due to EL. |
| format | H2 |
| id | RepoSLU14488 |
| institution | Swedish University of Agricultural Sciences |
| language | Inglés swe |
| publishDate | 2019 |
| publishDateSort | 2019 |
| publisher | SLU/Dept. of Animal Nutrition and Management (until 231231) |
| publisherStr | SLU/Dept. of Animal Nutrition and Management (until 231231) |
| record_format | eprints |
| spelling | RepoSLU144882019-05-17T01:00:14Z Effects of extruded linseed on methane emission and milk production of dairy cows Effekter av extruderat linfrö på metanemission och mjölkproduktion hos mjölkkor Blomdahl, Stina extruded linseed methane output fatty acid milk yield The agriculture sector is one of the major sources to produce greenhouse gases of today. One big contributor is methane (CH4) generated during rumen digestion of the feed carbohydrates. One approach to lower CH4 output from the agriculture sector, is to change the diet for the cows. Diets with extruded linseed (EL) have in earlier studies showed to have a lowering effect on CH4 output from cows. Previous studies have shown correlations between CH4 output and fatty acid (FA) profile of milkfat. EL has also shown in previous studies to influence the FA profile in milkfat. The objects of this study were to evaluate if CH4 output can be reduced if diets are supplemented with extruded linseed, if CH4 increases the concentration of unsaturated FA in milk fat, and the effect of EL on milk yield. In this study a total of 177 cows from five herds were individually scanned for CH4 output, milk fatty acid profile and milk yield. Cows were studied while fed a control diet, during the treatment diet with EL and when going back to the control diet again. EL diets had no effect on milk yield but increased the unsaturated FA in the milk. EL also decreased the CH4 output from the cows with 22% from the first control period to the treatment diet, however there was no increase of CH4 output between treatment period and second control period. Conclusion of this master thesis is that Extruded linseed did not affect the milk yield. EL had an effect on milk fat composition. Due to the unreliable measuring method of methane this study could not point out an obvious decrease of CH4 due to EL. Lantbruket är en betydande källa till dagens globala utsläpp av växthusgaser. Växthusgasen metan produceras i kons våm när fodret smälts. Ett sätt att minska dessa utsläpp från lantbrukssektorn är att förändra foderstaten för boskapen. Att inkludera extruderat linfrö (EL) i foderstaten har i tidigare försök visat sig minska metanutsläppet. Tidigare försök har även visat att det finns en korrelation mellan metanutsläpp och mjölkfettets fettsyreprofil samt att EL påverkar mjölkfettets fettsyreprofil. I denna studie har totalt 177 kor från 5 gårdar medverkat för att undersöka ELs effekt på mjölkavkastning, fettsyrasamansättningen i mjölken och metanutsläpp från kor. Kornas metanutsläpp mättes totalt tre gånger under testperioden. Första gången under en kontrollfoderstat andra gången under behandlingsfoderstat med EL och slutligen under ytterligare en kontrollfoderstat. Denna studie visar att EL inte hade någon effekt på mjölkavkastningen. EL ökade de omättade fettsyrorna och minskade de mättade fettsyrorna i mjölken. EL minskade metan utsläppen per kg ECM med 22 % mellan första kontrollperioden och den följande perioden med behandlingsfoderstaten. Dock erhölls ingen förändring i metanutsläpp då korna åter fick kontrollfoderstaten. Slutsatsen av denna studie är att EL hade en effekt på mjölkfettsyraprofilen. På grund av mätmetoden kunde inte studien visa på ett tydligt minskat metanutsläpp beroende på EL. SLU/Dept. of Animal Nutrition and Management (until 231231) 2019 H2 eng swe https://stud.epsilon.slu.se/14488/ |
| spellingShingle | extruded linseed methane output fatty acid milk yield Blomdahl, Stina Effects of extruded linseed on methane emission and milk production of dairy cows |
| title | Effects of extruded linseed on methane emission and milk production of dairy cows |
| title_full | Effects of extruded linseed on methane emission and milk production of dairy cows |
| title_fullStr | Effects of extruded linseed on methane emission and milk production of dairy cows |
| title_full_unstemmed | Effects of extruded linseed on methane emission and milk production of dairy cows |
| title_short | Effects of extruded linseed on methane emission and milk production of dairy cows |
| title_sort | effects of extruded linseed on methane emission and milk production of dairy cows |
| topic | extruded linseed methane output fatty acid milk yield |