so i may have stumbled accross the answer to this. it isn't a sub-species of pronghorn, it's a poulation of pronghorn.

the flint hills herd is nearing extinction. the population is down to 50 or so animals. this herd represents the easternmost extent of historic pronhorn range. urbanization is driving the pronghorn out of the area.

i hope that was it.

Im not sure are they desert pronghorns all I know is I was watching scientists shoot them off helis with nets they got the first 4 no problem the 5th they killed with the net snapped its neck and they were talking about how great it was to have a specimen this fresh to work with. One hell of an animal and can they ever fly across the desert. They were saying something about only 100 being left in that area and thier food is getting scarcer and scarcer.

You may be talking about Sonoran Antelope, which are on the endangered species list. I think there are about 500 left and spread between Northern Mexico and Southern Arizona border regions.

Yep that is the ones thanks man Ive been waiting for someone too come on here that knows what I was talking about I guess its true you wait long enough someone will come along that knows what you wanna know. Anyway thanks alot and do you know if the species is still on the verge or are they getting better because I think the show was about saving them just wanted to make sure there wasnt going to be another species gone extinct.They are an amazing creature from what I seen and they run like the wind. The scientists were having problems netting them from choppers so you gotta bet that they are as smart as they are fast.

As far as I know, that particular sub-species of Pronghorn Antelope is still threatened, or endangered, and recent drought years haven't helped. I read about them once in a while in newsletters/emails I receive from the Arizona Game and Fish Department (http://www.azgfd.com). If I recall, part of the issue is that most(?) reside in Mexico and the US/Az has little say in making policy or protection mechanisms on that side of the border, but I think they try to cooperate in their protection...? The same goes for the Jaguar that are rare in Southern Arizona and Mexico.
The "Sonoran" Antelope is one of about 4 or 5 sub-species of Pronghorn, and the smallest I think as well. I would have to do some "Google" searches or something to get more updated information on them though.
Take care.

Yea now I know we are deffinetly talking about the same thing thanks again unit5. When they were doing the show they mentioned that they were having problems finding food and water because of the very hot desert they are living in and they have in result changed thier diets so they could flourish but I guess it isnt working. The antelope were eating cactus's to get water and food it was one particular plant but I also forget the name of that all I know is it didnt look to tasty and it was covered in thorns.

Probably "Prickly Pear" cactus. They get the name from the fruit that grows on them after they bloom I think.
Javelina (collared peccary) eat the cactus all the time, and in fact tear them to shreds doing it. It is a good sign they are in the area when hunting them.