Video Perhitungan Estimasi Bobot Badan Sapi, Kambing dan Domba Praktikum ITP 2023

Summary

This video covers the fundamental concepts of estimating the body weight of livestock, focusing on cattle, goats, and sheep. It introduces methods for calculating estimated body weight using formulas like Skyfer, Lambren, Aljabar Moko, and Ningsih, explaining each step in detail. The process includes converting units, applying formulas, and calculating the percentage of error in the estimations. With practical examples and clear instructions, this tutorial provides essential skills for estimating livestock body weight in field conditions, which is crucial when actual weighing is not possible.

Takeaways

• 😀 Estimating the body weight of livestock, such as cattle, goats, and sheep, is crucial when weighing them is not possible.
• 😀 Body weight estimation can be done using specific formulas, such as the Skyfer and Lambren formulas for cattle, and the Aljabar Moko and Ningsih formulas for goats and sheep.
• 😀 Accurate measurements of body dimensions (like body length and chest circumference) are essential for proper estimation.
• 😀 The Skyfer formula for cattle involves using body length (in inches) and chest circumference (in inches), with the result converted from pounds to kilograms.
• 😀 The Lambren formula for cattle uses body length and chest circumference (in centimeters) and provides the weight estimate directly in kilograms.
• 😀 The Skyfer formula’s weight estimate for a cow, based on a body length of 130 cm and a chest circumference of 170 cm, resulted in an estimate of 344.35 kg, with a calculation error of 9.3%.
• 😀 In the Lambren formula, the same data (130 cm body length and 170 cm chest circumference) resulted in a weight estimate of 346.59 kg with an error percentage of 9.3%.
• 😀 For goats and sheep, different formulas like Aljabar Moko and Ningsih are used for weight estimation.
• 😀 The Aljabar Moko formula for goats calculates body weight using chest circumference squared and body length, resulting in an estimate of 23.24 kg with an error of 5.64%.
• 😀 The Ningsih formula for goats gives a weight estimate of 27.04 kg with a higher error percentage of 22.9%, showing less accuracy compared to the Aljabar Moko formula.

Q & A

What is the purpose of estimating body weight in livestock?

Estimating body weight in livestock is essential for understanding the health and productivity of the animals. It allows farmers and practitioners to assess weight without physically weighing the animals, which can be difficult in certain situations.

What is the first formula used in the script to estimate body weight?

The first formula used is the Skyfer formula, which calculates the estimated body weight of livestock using the absolute body length and chest girth squared, divided by 300.

How do you convert measurements from centimeters to inches for the Skyfer formula?

To convert from centimeters to inches, multiply the given centimeters by 0.393. For example, 130 cm becomes 51.09 inches, and 170 cm becomes 66.81 inches.

How do you convert the estimated weight from pounds to kilograms in the Skyfer formula?

To convert from pounds to kilograms, multiply the result by 0.453. For example, 760.15 pounds becomes approximately 344.35 kilograms.

What is the formula for calculating the percentage error in the Skyfer formula?

The percentage error is calculated by subtracting the real weight from the estimated weight, dividing by the real weight, and multiplying by 100%. For example, (344.35 kg - 317 kg) / 317 kg * 100% results in a percentage error.

What is the second formula used to estimate body weight in the script?

The second formula used is the Lambren formula, which estimates body weight by multiplying the absolute body length by the chest girth squared, divided by 10,840.

Why does the Lambren formula not require conversion to inches or pounds?

The Lambren formula is directly calculated using centimeters and kilograms, so there is no need for conversion to inches or pounds, unlike the Skyfer formula.

What is the percentage error calculated for the Lambren formula?

For the Lambren formula, the percentage error is calculated as (346.59 kg - 317 kg) / 317 kg * 100%, which results in a 9.3% error.

How are the formulas for estimating body weight applied to goats and sheep?

For goats and sheep, two formulas are used: the Aljabar Moko formula and the Ningsih formula. Both formulas rely on the same basic principle of using chest girth and body length to estimate weight.

What are the results of using the Aljabar Moko and Ningsih formulas for goats?

Using the Aljabar Moko formula for a goat results in an estimated weight of 23.24 kg, with a percentage error of 5.64%. Using the Ningsih formula for the same goat gives an estimated weight of 27.04 kg, with a percentage error of 22.9%.