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Fatty acid composition of lipids in immature cattle, pig and sheep oocytes with intact zona pellucida.
J Reprod Fertil. 2000 Jan; 118(1):163-70.JR

Abstract

Cattle, pig and sheep oocytes isolated from healthy cumulus-oocyte complexes were pooled, within species, to provide samples of immature denuded oocytes with intact zona pellucida (n = 1000 per sample) for determination of fatty acid mass and composition in total lipid, constituent phospholipid and triglyceride. Acyl-containing lipid extracts, transmethylated in the presence of a reference penta-decaenoic acid (15:0), yielded fatty acid methyl esters which were analysed by gas chromatograph. Mean (+/- SEM) fatty acid content in samples of pig oocytes (161 +/- 18 micrograms per 1000 oocytes) was greater than that in cattle (63 +/- 6 micrograms; P < 0.01) and sheep oocytes (89 +/- 7 micrograms; P < 0.05). Of 24 fatty acids detected, palmitic (16:0; 25-35%, w/w), stearic (18:0; 14-16%) and oleic (18:1n-9; 22-26%) acids were most prominent in all three species. Saturated fatty acids (mean = 45-55%, w/w) were more abundant than mono- (27-34%) or polyunsaturates (11-21%). Fatty acids of the n-6 series, notably linoleic (18:2n-6; 5-8%, w/w) and arachidonic acid (20:4n-6; 1-3%), were the most abundant polyunsaturates. Phospholipid consistently accounted for a quarter of all fatty acids in the three species, but ruminant oocytes had a lower complement of polyunsaturates (14-19%, w/w) in this fraction than pig oocytes (34%, w/w) which, for example, had a three- to fourfold greater linoleic acid content. An estimated 74 ng of fatty acid was sequestered in the triglyceride fraction of individual pig oocytes compared with 23-25 ng in ruminant oocytes (P < 0.01). It is concluded that the greater fatty acid content of pig oocytes is primarily due to more abundant triglyceride reserves. Furthermore, this species-specific difference, and that in respect of polyunsaturated fatty acid reserves, may underlie the contrasting chilling, culture and cryopreservation sensitivities of embryos derived from pig and ruminant (cattle, sheep) oocytes.

Authors+Show Affiliations

McEvoy TG
Scottish Agricultural College, Animal Biology Division, Bucksburn, Aberdeen, UK.
Coull GD
No affiliation info available
Broadbent PJ
No affiliation info available
Hutchinson JS
No affiliation info available
Speake BK
No affiliation info available

MeSH

Analysis of VarianceAnimalsArachidonic AcidCattleChromatography, GasFatty AcidsFemaleLinoleic AcidLipidsOleic AcidOocytesPalmitic AcidPhospholipidsRuminantsSheepSpecies SpecificityStearic AcidsSwineTriglycerides

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

10793638

Citation

McEvoy, T G., et al. "Fatty Acid Composition of Lipids in Immature Cattle, Pig and Sheep Oocytes With Intact Zona Pellucida." Journal of Reproduction and Fertility, vol. 118, no. 1, 2000, pp. 163-70.
McEvoy TG, Coull GD, Broadbent PJ, et al. Fatty acid composition of lipids in immature cattle, pig and sheep oocytes with intact zona pellucida. J Reprod Fertil. 2000;118(1):163-70.
McEvoy, T. G., Coull, G. D., Broadbent, P. J., Hutchinson, J. S., & Speake, B. K. (2000). Fatty acid composition of lipids in immature cattle, pig and sheep oocytes with intact zona pellucida. Journal of Reproduction and Fertility, 118(1), 163-70.
McEvoy TG, et al. Fatty Acid Composition of Lipids in Immature Cattle, Pig and Sheep Oocytes With Intact Zona Pellucida. J Reprod Fertil. 2000;118(1):163-70. PubMed PMID: 10793638.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fatty acid composition of lipids in immature cattle, pig and sheep oocytes with intact zona pellucida. AU - McEvoy,T G, AU - Coull,G D, AU - Broadbent,P J, AU - Hutchinson,J S, AU - Speake,B K, PY - 2000/5/4/pubmed PY - 2000/5/16/medline PY - 2000/5/4/entrez SP - 163 EP - 70 JF - Journal of reproduction and fertility JO - J Reprod Fertil VL - 118 IS - 1 N2 - Cattle, pig and sheep oocytes isolated from healthy cumulus-oocyte complexes were pooled, within species, to provide samples of immature denuded oocytes with intact zona pellucida (n = 1000 per sample) for determination of fatty acid mass and composition in total lipid, constituent phospholipid and triglyceride. Acyl-containing lipid extracts, transmethylated in the presence of a reference penta-decaenoic acid (15:0), yielded fatty acid methyl esters which were analysed by gas chromatograph. Mean (+/- SEM) fatty acid content in samples of pig oocytes (161 +/- 18 micrograms per 1000 oocytes) was greater than that in cattle (63 +/- 6 micrograms; P < 0.01) and sheep oocytes (89 +/- 7 micrograms; P < 0.05). Of 24 fatty acids detected, palmitic (16:0; 25-35%, w/w), stearic (18:0; 14-16%) and oleic (18:1n-9; 22-26%) acids were most prominent in all three species. Saturated fatty acids (mean = 45-55%, w/w) were more abundant than mono- (27-34%) or polyunsaturates (11-21%). Fatty acids of the n-6 series, notably linoleic (18:2n-6; 5-8%, w/w) and arachidonic acid (20:4n-6; 1-3%), were the most abundant polyunsaturates. Phospholipid consistently accounted for a quarter of all fatty acids in the three species, but ruminant oocytes had a lower complement of polyunsaturates (14-19%, w/w) in this fraction than pig oocytes (34%, w/w) which, for example, had a three- to fourfold greater linoleic acid content. An estimated 74 ng of fatty acid was sequestered in the triglyceride fraction of individual pig oocytes compared with 23-25 ng in ruminant oocytes (P < 0.01). It is concluded that the greater fatty acid content of pig oocytes is primarily due to more abundant triglyceride reserves. Furthermore, this species-specific difference, and that in respect of polyunsaturated fatty acid reserves, may underlie the contrasting chilling, culture and cryopreservation sensitivities of embryos derived from pig and ruminant (cattle, sheep) oocytes. SN - 0022-4251 UR - https://www.unboundmedicine.com/medline/citation/10793638/Fatty_acid_composition_of_lipids_in_immature_cattle_pig_and_sheep_oocytes_with_intact_zona_pellucida_ DB - PRIME DP - Unbound Medicine ER -