  The neutralino relic density is calculated in the low-energy effective
Minimal Supersymmetric extension of Standard Model (effMSSM). The
slepton-neutralino, squark-neutralino and neutralino/chargino-neutralino
coannihilation channels are taking into account. The comparative study of these
coannihilations is performed and demonstrated that all of them give the sizable
contributions to the reduction of the neutralino relic density. It is shown
that the predictions for direct dark matter detection rates are not strongly
affected by these coannihilation channels in the effMSSM.
