In the absence of a special device, the cattle weight determination table will be an indispensable assistant. Weighing adults or calves is often difficult, but it is impossible to do without knowing the mass of animals. These data are necessary when selling cattle, to study the development and fattening. The enterprising livestock breeders have learned how to do without weights and learn the mass by special formulas, using a measuring tape or measuring tape as a measuring tool.
Error in weightless mass determination and measurement rules
Measuring the weight of cattle by measuring shows not quite accurate results. Determination of body weight by the table or formulas gives an error of 20-30 kg, sometimes less - this is not a critical indicator, just remember this. If you use measurements to monitor the development of livestock, then a little inaccurate numbers will not hurt you at all.
In order for the error in measuring the mass of calves according to measurements to be minimal, it is important to learn how to take measurements correctly. It is not always easy, because animals do not like to stand still and wait for the farmer to make these same measurements. The procedure is complicated with age, because animals become larger.
To determine the weight of young cattle or adults, two values are needed: the girth of the sternum and the length of the body, measured by oblique.
To measure the girth of the sternum, you should hold a measuring tape behind the shoulder blades. The oblique length of the carcass is measured from the extreme point of the protrusion on the humerus and to the protrusion on the sciatic tubercle. It is important to learn how to correctly and quickly take measurements, because they are necessary for all methods for determining live weight of cattle without weights.
Methods for measuring the weight of livestock without weights and the formula for calculating the average weight
On many farms, to find out the weight of a bull, use simple calculations, rather than measuring instruments. This is due to the fact that a bull in 2-3 months can still fit on the scales, but it will be difficult to find such scales for adults. Yes, and drive the animal to the platform for weighing - not an easy task.
It was for this reason that the computational models were invented: the Trukhanovsky method, the Klever-Strauch table, and the Freuven table. For some breeds, there are separate formulas for calculating, since they are much larger than the standard dimensions that cattle reach. For example, black-and-white breed.
If you do not have a table of the ratio of body and mass parameters at hand, then you can calculate the weight using the regression equation: Y = 5.3x-X. In this formula, a small "x" will vary depending on the size of the chest. The exact value of "X" large for animals of different massiveness can be viewed in the table:
This table and formula will help you know how much cows and bull-calves weigh in adulthood. To calculate the mass of the newborn calf, there are other methods that do not require mathematical calculations.
The weight of a bull or a lady at the age of three to six months or not reaching a year is convenient to consider using the Froiven method; you will need the meter and the numbers given in the table below:
In the left column indicates the volume of the breast. In the upper row - the length of the body, measured along an oblique line. At the junction of indicators you will find how much a calf weighs. This way it is convenient to measure the mass of the animal at birth, but if you want to know the exact mass of the cow, use the weights.
Most often, in the household, to follow the development, it is enough to know the average mass of cattle - approximate data. But purposeful fattening of cows and bulls for meat require exact figures.
Kluwer Strauch Method
This method allows you to determine the average weight of a cow or a bull in a more adult age. To use the table, you also need to determine the volume of the chest and the length of the cow's body along an oblique line.
Oblique length is measured from the middle of the shoulder to the end of the thigh. The data for calculating the mass are summarized in the table:
If you are not sure how to find out the weight of an adult without weighing, then the Kluwer-Strauch method is perfect for you. It can be used to track the difference in performance during the first and third trimester of pregnancy, or simply to keep track of the mass of the young heifer.
Example: when measuring chest girth, you get 175 cm. The slanting body length is 165 cm. We look at where these numbers intersect in the table, and we get that the animal's weight is 443 kg.
If you need to quickly determine the weight of the calf, then one of the best methods is the Trukhanovsky formula: (AxB / 100) xK. A is the chest girth, B is the oblique length of the body, and K is the added factor. K always depends on the type of breed:
- dairy breeds (or any breeding individual): K = 2;
- meat breeds: K = 2.5.
To the resulting number, you must add or subtract 5-10%, depending on the fatness of the cow. Of course, only the approximate live weight is determined this way.
Black Pied Cows Mass Measurement
Some breeds of cows are very different and general laws and standard systems for determining the live weight of young stock do not apply. So, for the black-and-white breed there is a separate table for measuring weight, working with which you can quite accurately “weigh” an animal without resorting to weights. If you are wondering why a separate table has been developed for this breed, then you can read about it in our article “Black-and-white cows”.
If you do not know how to find out the weight of cattle by measurements from the table, study it:
To use the table in determining the weight of cattle, it is necessary to measure the chest girth according to the above scheme. Further, with the help of a tape measure or measuring tape, the girth of the belly is measured in the bulk of the tape. In the table below, we are looking for the point at which the obtained values intersect - this is the live weight of cattle of the black-and-white breed.
In practice, it is inconvenient to use a tape measure to take measurements, since it is made of rigid material. If you do not have a centimeter, then you can use a string as a measuring tape - by measuring the girth, attach it to a ruler or tape measure, it is much more convenient.
We use a special tape
If you have a large farm, which breeds pork, beef and other meat, then the tables for determining the live weight of young stock are easily confused. In this case, a special measuring tape, which already has the necessary values, will help.
For those who do not know how to determine the weight of such a tape, we tell. Measure the length of the body, starting from the point where the front legs end, and look at the value on the tape. This method is much more convenient than measuring the mass of the circumference of the thoracic zones and the oblique length of the body.
It is important to understand that when taking measurements, the animal must be calm. In case of unstable behavior of cattle, with live weight, inaccuracies may occur. So, at the first measurement the heifer weighed 350 kg, at the second - 400 kg. To determine the weight more accurately, simply calculate the average value of the obtained indicators.
To save the article or share it with friends, do a repost.
Write comments on this topic - our readers will be interested.