J. Anim Sci.
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Journal of Animal Science, Vol 69, Issue 3 1147-1150, Copyright © 1991 by American Society of Animal Science

JOURNAL ARTICLE

Development of one-cell porcine embryos to the blastocyst stage in simple media

D. R. Hagen, R. S. Prather, M. M. Sims and N. L. First
University of Wisconsin, Madison 53706.

Porcine embryos were flushed from mated donors and examined for cleavage stage. One- and two-cell embryos were randomly allotted to one of the five following in vitro treatments: M199 with Earle's salts, a modified Tyrode's medium (TL), TL supplemented with 10 mM N-2-hydroxyethyl-piperazine-N'-2-ethanesulfonic acid (HEPES) (TLH), TLH supplemented with 5.5 mM glucose (TLHG), or TLH supplemented with 5 mM glutamine (TLHGL). The bicarbonate concentration of TLH, TLHG, and TLHGL was 2 mM, compared with the 25 mM concentration in M199 and TL. Embryos in M199 and TL were incubated in 95% air:5% CO2 at 39 degrees C. Those in the remaining three treatments were incubated in air at 39 degrees C. Embryos incubated in TL and M199 did not develop past the four- to eight-cell stage, whereas the proportions of embryos developing to the compact morula or blastocyst stage by d 7 of culture in the other treatments were as follows: TLHG, 49.1%; TLHGL, 59.4%; TLH, 63.5% (P less than .005). These results indicate that porcine embryos can be cultured from the one-cell stage to blastocyst in a simple HEPES-buffered medium in air. The ability of porcine embryos to develop without supplemental CO2 may be an important finding for use in situations in which embryos must be transported for long periods before embryo transfer.


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Copyright © 1991 by the American Society of Animal Science.