Effects of dietary unsaturated fatty acids on oocyte quality and follicular development in lactating dairy cows in summer.

Effects of dietary unsaturated fatty acids on oocyte quality and follicular development in lactating dairy cows in summer. Research Abstract Details 

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Effects of dietary unsaturated fatty acids on oocyte quality and follicular development in lactating dairy cows in summer. Abstract Text:

T R Bilby,J Block,B C do Amaral,O Sa Filho,F T Silvestre,P J Hansen,C R Staples,W W Thatcher,

Dietary sources of fatty acids were evaluated for their influence on oocyte quality and follicular development using 54 lactating cows in summer. Fat supplements were 1) sunflower oil (80% cis 18:1), 2) Ca salt of transoctadecenoic acids (57% trans 18:1), 3) Ca salt of vegetable oils (30% 18:2), and 4) linseed oil (56% 18:3 and 16% 18:2). Fats were fed at 1.35% of dietary dry matter beginning at 5 wk prior to expected calving date and at 1.5% (oils) and 1.75% (Ca salts) of dietary dry matter for 15 wk after parturition. Four days following a programmed induced ovulation, 5 transvaginal oocyte aspirations were performed 3 or 4 d apart. Three days after the last aspiration, PGF2alpha was injected, followed 3 d later by a GnRH injection and a timed artificial insemination (d 0) 16 to 20 h later. For the first 4 aspirations, oocytes grading 1 or 2 were used for in vitro embryo production. Total cell number and the proportion of terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL)-positive blastomeres were analyzed at d 8. At the fifth aspiration, the occurrence of metaphase II, group II caspase activity, and TUNEL labeling were determined after oocyte maturation. A total of 1,011 oocytes were collected. The proportion of oocytes with high caspase activity was greater for grade 3 compared with grades 1 and 2 (37.5 vs. 1.54 and 1.61%). Feeding polyunsaturated fatty acids, as compared with monosaturated fatty acids, failed to affect oocyte quality, as demonstrated by subsequent embryo development. Cows fed 18:2- or 18:3-enriched diets had a larger preovulatory follicle at insemination and subsequent volume of the corpus luteum compared with those fed cis 18:1 or trans 18:1 diets (16.8, 16.2 vs. 15.0, 14.9 +/- 0.7 mm; 7,323, 8,208 vs. 6,033, 5,495 +/- 644 mm3, respectively). The previously documented benefits of polyunsaturated fatty acids on reproductive performance appear to reflect actions at alternative biological windows in lactating dairy cows.

Effects of dietary unsaturated fatty acids on oocyte quality and follicular development in lactating dairy cows in summer. Publishing Authors By Initials

TR Bilby,J Block,BC do Amaral,O Sa Filho,FT Silvestre,PJ Hansen,CR Staples,WW Thatcher,

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Effects of dietary unsaturated fatty acids on oocyte quality and follicular development in lactating dairy cows in summer. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Journal of dairy science

VOLUME: 89

Page Numbers: 3891-903

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ISSN: 1525-3198

DAY: 8

MONTH: Oct

YEAR: 2006

Effects of dietary unsaturated fatty acids on oocyte quality and follicular development in lactating dairy cows in summer. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Effects of dietary unsaturated fatty acids on oocyte quality and follicular development in lactating dairy cows in summer.

AFFILIATION: Department of Animal Sciences, University of Florida, Gainesville, Florida 32611-0910, USA.

Country: United States

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MEDLINETA: J Dairy Sci

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