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Cows were slaughtered 10 d later, with each uterine horn flushed, the pre-implantation conceptus located, and inter-caruncular endometrial tissue collected from the gravid horn (containing the pre-implantation conceptus) and non-gravid horn. Endometrial fatty acid concentrations in the gravid and non-gravid horn were compared using linear models in restricted maxiumum likelihood. Investigations of the correlations among selected fatty acids and trophoblast weight or uterine fluid interferon-tau (IFN-\u03c4) concentrations were also undertaken. The presence of the pre-implantation conceptus had relatively minor effects on endometrial fatty acid concentrations, but the \u03c96:\u03c93 ratio was greater and concentrations of stearic and oleic acid were slightly increased in the gravid horn. In the gravid horn, a negative linear relationship between the concentration of arachidonic acid and conceptus weight and IFN-\u03c4 concentration in the uterine luminal fluid were observed. In contrast, there was a positive relationship between concentrations of dihomo-\u03b3-linolenic acid in the non-gravid horn and conceptus weight. In conclusion, the presence of the pre-implantation conceptus appears to modulate endometrial fatty acids, as indicated by the differences in endometrial fatty acid concentrations in the gravid and non-gravid uterine horns. The physiological implication of these local effects of the pre-implantation conceptus, on reproductive success requires further investigation.<\/jats:p>","DOI":"10.1017\/s0022029911000173","type":"journal-article","created":{"date-parts":[[2011,4,8]],"date-time":"2011-04-08T10:02:18Z","timestamp":1302256938000},"page":"263-269","source":"Crossref","is-referenced-by-count":10,"title":["Modification of endometrial fatty acid concentrations by the pre-implantation conceptus in pasture-fed dairy cows"],"prefix":"10.1017","volume":"78","author":[{"given":"Susanne","family":"Meier","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Caroline G","family":"Walker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Murray D","family":"Mitchell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mathew D","family":"Littlejohn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"John R","family":"Roche","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"56","published-online":{"date-parts":[[2011,4,8]]},"reference":[{"key":"S0022029911000173_ref33","doi-asserted-by":"crossref","DOI":"10.1186\/1477-7827-2-49","article-title":"Conceptus signals for establishment and maintenance of pregnancy","volume":"2","author":"Spencer","year":"2004","journal-title":"Reproductive Biology and Endocrinology"},{"key":"S0022029911000173_ref1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(06)72581-4"},{"key":"S0022029911000173_ref2","unstructured":"AOCS 1998 Fatty acid composition by capillary GC (Ce 1e-91). 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