producing something out of her front end. and that helps you to work out how much methane she's producing? yeah, so methane is produced after she's eaten her meals, so if we know how much she's eating, how often she's eating, we'll be able to extrapolate her methane, as well as being able to measure it to compare it. and you have belch chambers, is that right? we do. we use those for research, that's not something we use routinely in the field, and we use it very infrequently to really get an idea of how the methane changes over time, how it might differ for this cow over another cow or eating different foods. is there any way we can find out how much methane magenta's producing right now? yeah, so the equipment that we have in the chamber is not exactly the same as this — this is a laser methane reader. right. that measures the parts per million of methane that might be coming out of magenta's front end at any one time. let's give that a go. i'm going to get out of the way because it is a laser! there's a laser, and we all know how dangerous lasers are. so, magenta, if you don't mind. yeah, don't listen, magenta! 0k. 0h...she�*s licking it, she knows it's coming. she doesn't chase it like a cat does. 0h, she's...