[Konstantinos]

No. An example, let's say you want to use the animlib of PED.

pawn Код:

// global:
new
    bool: First_Spawn[ MAX_PLAYERS char ]
;

// OnPlayerConnect:
First_Spawn{ playerid } = true;

// OnPlayerSpawn:
if( First_Spawn{ playerid } )
{
    PreloadAnimLib( playerid, "PED" );
    First_Spawn{ playerid } = false;
}

// Where you want to use the animation
ApplyAnimation( playerid, "PED", "cower", 1, 1, 0, 0, 0, 0, 1 );

// at the bottom:
stock PreloadAnimLib( playerid, animlib[ ] )
{
    ApplyAnimation( playerid, animlib, "null", 0.0, 0, 0, 0, 0, 0) ;
}

That will preload the animation the first time you'll spawn so you can use it later.