Trying to get a Horse Whinny Effect on Trumpet Music

I'm making a MuseScore file to help me and the rest of the trumpets in my band practice one of our pieces for our next concert, and at the end of the song, there's a horse whinny sound that the trumpets are supposed to play. It's written in the music with a really long glissando, but the glissando in MuseScore doesn't make the right sound and it doesn't work across multiple measures the way that it's written in the actual music. Is there a way to get the effect I'm looking for so that the practice recording is accurate to the song? The image attachment is the horse whinny in the actual music that I'm trying to translate into MuseScore..