In a comment to the previous posting, For those who may think that women get an easy pass in the military, in which I mention (and give formulae for) Body Mass Indices (BMIs), Stu mentioned that he had previously posted on a method developed by James Chesterman, of Sheffield, England, to estimate the weight of a bovine. He did, indeed.
In reading Stu's posting - Wednesday, February 10, 2016, A precursor to BMI ;-) - it occurs to me that a diagram might be helpful to my blog friends. Most of us were not raised on a farm or ranch, around cattle. (My maternal grandparents were dairy farmers so I've no excuse for needing the diagram!)
From a posting on Tractor Supply Company's website, How to Calculate Cattle Weight, I reproduce their diagram that shows where the measurements are taken, and the instructions on what to do with them. (Although Stu wrote about cows, note that the Tractor Supply Company, of which there is an outlet about 15 miles down the road from us, applies the same methodology to beef cattle.)
Unless you are a commercial livestock farmer, you probably do not own a livestock scale. Figuring out how to weigh a cow, bull or calf is easy if you can measure the animal body length and girth. Use this guide to determine the weight of your dairy cow or beef cattle:
- Measure the circumference of the animal, as shown in "distance C" in the illustration. Make sure to measure girth in relation to the location of the animal's heart. [Good luck in figuring out where that is! CC]
- Measure the length of the animal's body, as shown in distance A-B in the illustration.
- Using the measurements from steps 1 and 2, calculate body weight using the formula HEART GIRTH x HEART GIRTH x BODY LENGTH / 300 = ANIMAL WEIGHT IN POUNDS. For example, if a beef cow has a heart girth equal to 70 inches and a body length equal to 78 inches, the calculation would be (70 x 70 x 78) / 300 = 1,274 lb.