Yes, that is every from Primos to Quaker Boy, "can" A contact call rises and falls in pitch as it goes through the notes. On this particular site here, http://www.bowsite.com/bowsite/features/practical_bowhunter/deergrunting/deergrunt.html they give two examples of a bleat, one the contact call, the second the estrous call. Everything I've ever read or researched in the last 20 years since I bought my first call is that there is no scientic research behind the "estrous" bleat. I don't know if science has changed that finding or not. To me, they are very very similiar in tone other than one, an adult doe and the other a fawn. However you can imitate the same calls on most tube calls. My friend and I joke when in the stand or season and elongate a YYYyyeeeaaahhhh, lol

Anyway, I hope that site helps and I've used the "contact""estrous" call from the begining of the season and to the end mixed with buck grunts with great success. Deer are very vocal and communicate. Just Saturday evening I had a button buck at 200 yards. I "contact" called, he threw his head up and headed my way only to stop, a second bleat from my River Valley Deer Flute and he threw his tail up and ran full speed to the base of my tree (20 yards) he was mewing and bleating his little dear head off..lol Poor little guy.