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.
Measure the length of the animal's body, as shown in distances A-B in the illustration.
Using the measurements from steps 1 and 2,

the cattle body weight formula

calculates body weight using the formula 
HEART GIRTH x HEART GIRTH x BODY LENGTH / 300 = 
NB:- 300 is the standard unit

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

 






key words:
how to estimate the live weight of cattle in kg
estimating the bodyweight of cattle using linear body measurements
how to calculate the bodyweight of animals
cattle body weight formula
how to estimate carcass weight of cattle