Influence of pasture and concentrates in the diet of grazing dairy cows on the fatty acid composition of milk
In five short-term experiments conducted in Victoria in 1997 and 1998, grazing dairy cows were given either pasture alone or pasture supplemented with high-energy concentrates, and the fatty acid profiles of milk fat were measured. We established the effects of these feeds on some aspects of milk fa...
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| Veröffentlicht in: | Journal of dairy research 2003-08, Vol.70 (3), p.267-276 |
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| creator | Stockdale, C Richard Walker, Glen P Wales, William J Dalley, Dawn E Birkett, Anne Shen, Zhiping Doyle, Peter T |
| description | In five short-term experiments conducted in Victoria in 1997 and 1998, grazing dairy cows were given either pasture alone or pasture supplemented with high-energy concentrates, and the fatty acid profiles of milk fat were measured. We established the effects of these feeds on some aspects of milk fat of importance for human nutrition, but we specifically focused on the hypothesis that conjugated linoleic acid (CLA) concentrations in milk fat increase as pasture intake increases, and decrease as more concentrates are fed. In agreement with previous research, feeding fresh pasture alone resulted in high concentrations (1·0–1·8 g/100 g milk fat) of CLA. When the effect of level of pasture consumption on CLA content was examined, a significant positive relationship (r2=0·35; P |
| doi_str_mv | 10.1017/S0022029903006009 |
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We established the effects of these feeds on some aspects of milk fat of importance for human nutrition, but we specifically focused on the hypothesis that conjugated linoleic acid (CLA) concentrations in milk fat increase as pasture intake increases, and decrease as more concentrates are fed. In agreement with previous research, feeding fresh pasture alone resulted in high concentrations (1·0–1·8 g/100 g milk fat) of CLA. When the effect of level of pasture consumption on CLA content was examined, a significant positive relationship (r2=0·35; P<0·05) was obtained. When cereal grain concentrates were used to supplement pasture intake, the CLA content of milk fat generally declined (P<0·05), except where the amount of concentrates given led to a marked reduction in total milk fat concentration. The use of cereal grain concentrates also generally resulted in significant (P<0·05) increases in medium-chain saturated fatty acids, but always reduced the contribution of butyric acid to milk fat, from 4·5 to 3·9 g/100 g milk fat, on average.</description><identifier>ISSN: 0022-0299</identifier><identifier>EISSN: 1469-7629</identifier><identifier>DOI: 10.1017/S0022029903006009</identifier><identifier>PMID: 12916820</identifier><identifier>CODEN: JDRSAN</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>Animal Feed ; Animal productions ; Animals ; Biological and medical sciences ; butyric acid ; Cattle - metabolism ; Cattle - physiology ; cereal concentrates ; Conjugated linoleic acid ; Dairy cattle ; dairy cows ; Dairying - methods ; Diet - veterinary ; fatty acid composition ; Fatty acids ; Fatty Acids - analysis ; Female ; Food industries ; Fundamental and applied biological sciences. Psychology ; Grain ; Grazing ; Human nutrition ; Lactation - metabolism ; Linoleic Acid - analysis ; Milk ; Milk - chemistry ; Milk and cheese industries. Ice creams ; milk fat ; Pasture ; pastures ; Poaceae ; saturated fatty acids ; Terrestrial animal productions ; Vertebrates</subject><ispartof>Journal of dairy research, 2003-08, Vol.70 (3), p.267-276</ispartof><rights>Proprietors of Journal of Dairy Research 2003</rights><rights>2003 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c526t-a78f9577eaf9b2803de7b60c4ce09a6b19beb878ff394a01ffd2130362a0b29f3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S0022029903006009/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,314,777,781,27905,27906,55609</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=14999309$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12916820$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Stockdale, C Richard</creatorcontrib><creatorcontrib>Walker, Glen P</creatorcontrib><creatorcontrib>Wales, William J</creatorcontrib><creatorcontrib>Dalley, Dawn E</creatorcontrib><creatorcontrib>Birkett, Anne</creatorcontrib><creatorcontrib>Shen, Zhiping</creatorcontrib><creatorcontrib>Doyle, Peter T</creatorcontrib><title>Influence of pasture and concentrates in the diet of grazing dairy cows on the fatty acid composition of milk</title><title>Journal of dairy research</title><addtitle>Journal of Dairy Research</addtitle><description>In five short-term experiments conducted in Victoria in 1997 and 1998, grazing dairy cows were given either pasture alone or pasture supplemented with high-energy concentrates, and the fatty acid profiles of milk fat were measured. We established the effects of these feeds on some aspects of milk fat of importance for human nutrition, but we specifically focused on the hypothesis that conjugated linoleic acid (CLA) concentrations in milk fat increase as pasture intake increases, and decrease as more concentrates are fed. In agreement with previous research, feeding fresh pasture alone resulted in high concentrations (1·0–1·8 g/100 g milk fat) of CLA. When the effect of level of pasture consumption on CLA content was examined, a significant positive relationship (r2=0·35; P<0·05) was obtained. When cereal grain concentrates were used to supplement pasture intake, the CLA content of milk fat generally declined (P<0·05), except where the amount of concentrates given led to a marked reduction in total milk fat concentration. The use of cereal grain concentrates also generally resulted in significant (P<0·05) increases in medium-chain saturated fatty acids, but always reduced the contribution of butyric acid to milk fat, from 4·5 to 3·9 g/100 g milk fat, on average.</description><subject>Animal Feed</subject><subject>Animal productions</subject><subject>Animals</subject><subject>Biological and medical sciences</subject><subject>butyric acid</subject><subject>Cattle - metabolism</subject><subject>Cattle - physiology</subject><subject>cereal concentrates</subject><subject>Conjugated linoleic acid</subject><subject>Dairy cattle</subject><subject>dairy cows</subject><subject>Dairying - methods</subject><subject>Diet - veterinary</subject><subject>fatty acid composition</subject><subject>Fatty acids</subject><subject>Fatty Acids - analysis</subject><subject>Female</subject><subject>Food industries</subject><subject>Fundamental and applied biological sciences. 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We established the effects of these feeds on some aspects of milk fat of importance for human nutrition, but we specifically focused on the hypothesis that conjugated linoleic acid (CLA) concentrations in milk fat increase as pasture intake increases, and decrease as more concentrates are fed. In agreement with previous research, feeding fresh pasture alone resulted in high concentrations (1·0–1·8 g/100 g milk fat) of CLA. When the effect of level of pasture consumption on CLA content was examined, a significant positive relationship (r2=0·35; P<0·05) was obtained. When cereal grain concentrates were used to supplement pasture intake, the CLA content of milk fat generally declined (P<0·05), except where the amount of concentrates given led to a marked reduction in total milk fat concentration. The use of cereal grain concentrates also generally resulted in significant (P<0·05) increases in medium-chain saturated fatty acids, but always reduced the contribution of butyric acid to milk fat, from 4·5 to 3·9 g/100 g milk fat, on average.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><pmid>12916820</pmid><doi>10.1017/S0022029903006009</doi><tpages>10</tpages></addata></record> |
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| ispartof | Journal of dairy research, 2003-08, Vol.70 (3), p.267-276 |
| issn | 0022-0299 1469-7629 |
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| source | MEDLINE; Cambridge University Press Journals Complete |
| subjects | Animal Feed Animal productions Animals Biological and medical sciences butyric acid Cattle - metabolism Cattle - physiology cereal concentrates Conjugated linoleic acid Dairy cattle dairy cows Dairying - methods Diet - veterinary fatty acid composition Fatty acids Fatty Acids - analysis Female Food industries Fundamental and applied biological sciences. Psychology Grain Grazing Human nutrition Lactation - metabolism Linoleic Acid - analysis Milk Milk - chemistry Milk and cheese industries. Ice creams milk fat Pasture pastures Poaceae saturated fatty acids Terrestrial animal productions Vertebrates |
| title | Influence of pasture and concentrates in the diet of grazing dairy cows on the fatty acid composition of milk |
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