in my opinion bleats can be useful to spike curiosity of deer but I only use them if the grunt tube isnt spiking any activity or if nothing is coming into rattaling. be careful how you use a bleat though as short estrous bleats replicate a doe in heat but long bleats can mimick a doe in distress and alarm deer in the area. youtube actually has some very good videos by whitetail biologists that show correct use of bleats,grunts,rattaling,etc....