Is one permitted to have dairy meals on Yom Tov? What about on Shabbos? What about at the seudah hamefsekes before yom Kippur?
Thank you and gmar chasima tovah.
The custom is to eat meat, and specifically chicken, at the Se’udah Mafsekes before Yom Kippur (Mishnah Berurah 608:16; Chayei Adam 133:16; see Peri Megadim, Eishel Avraham 608). This is not a full obligation, but it is the common custom, as poskim mention.
For Yom Tov, the Mishnah Berurah (529:11) writes that there is a mitzvah of eating meat, but explains in the Biur Halachah that there is no actual obligation to do so, because the essential joy of meat applies specifically to meat from the sacrificial offerings. The basic joy of Yom Tov is therefore fulfilled today with wine, rather than with meat.
See also Yam Shel Shlomo, Beitzah 2:5; see however Aruch Laner, Sukkah 42a.