Animal traction |

2. Draft animal selection |

**To determine an animal's weight, first measure the length of the animal from point of shoulder to point of rump (A-B) and the circumference of its torso at point of heart (C) with a tape or rope. (See the drawing on page 20.) When taking the torso or girth measurement, observe these rules:**

**• Measure in the morning before the animal drinks. Don't give it hay the night before.**

**• Have the animal stand squarely with its head in a normal position.**

**• Pull the tape snugly around the torso, at the smallest circumference behind the shoulders.**

Table 4-Power of Bulls (in yoke)

**Next, follow these formulas:**

**For bovine animals**

**Substitute measurements A-B (length) and C (circumference of torso at point of heart, or girth) into this formula:**

**(girth x girth x length)/300 = weight**

**For this formula, measurements must be taken in inches. If a metric tape or rope/rule is used to measure the animal, centimeters must be converted to inches before the formula can be used. One inch = 2.54 cm.**

**Example:**

**Girth of bull measures 152 cm, length measures 135 cm.**

**152/2.54 = 60 inches (girth)**

**135/2.54 = 53 inches (length)**

**(60 x 60 x 53)/300 = 636 lbs**

**Since one kg = 2.2 lbs, the weight of the animal in kg is obtained by dividing 2.2 into the answer above (636 lbs).**

**636/2.2 = 289 kg**

**The bull weighs 636 lbs or 289 kg.**

**An alternate method for estimating the weight of a steer (castrated bull):**

**Live weight • 1.04 [27.5758 x heart girth) -1.04967]**

For equine animals

**Substitute measurements A-B (length) and C (girth) into this formula:**

**(girth x girth x length)/300 + 50 lbs = weight**

**Measurements must be taken in inches, or converted into inches, before the formula is used.**

**Example:**

**Donkey's girth measures 37 inches, donkey's length measures 35 inches.**

**(37 x 37 x 35)/300 + 50 = weight of donkey**

**160 + 50 = 210 lbs**

**If the animal's weight is to be expressed in kg,**

**210/2.2 = 95 kg**

**The donkey weighs 210 lbs or 95 kg.**

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