To collect a cherished ingredient that's been on the menu in nuevo león for thousands of years. so you raise them here and then let them go? - yep. - rancho del puerto, one of the hundreds of ranches in nuevo león, specializes in deer farming. - so we have, like, three or four breeding pens, with 20, 25 does per stud. - mm-hmm. so there's only one man in here? - yeah. - and these are his ladies. - his ladies. - so are they all pregnant? - right now? we hope they are. [laughs] - oh. the deer may be bred in captivity, but then they're freed to roam, just like their ancestors did. there's many ...