Scientific Livestock Nutrition
Understanding the distinction between dry matter and bulk weight and why water content matters in animal feed.
The Dry Matter Factor
Animals need nutrients, not just bulk. Most fresh grass is over 80% water. If you feed an animal fresh grass vs dry grain, the bulk weight you need to move to the trough is vastly different. To calculate nutritional intake accurately, nutritionists always speak in "Dry Matter (DM)."
The Feed Formula
Estimating Percentage Intake:
- Maintenance: Generally, most adult ruminants require 2.0% of their body weight in Dry Matter just to maintain their current weight.
- Gestation/Lactation: Expect this to rise to 2.5% to 3.0% for pregnant animals and over 4.0% for heavy-yielding dairy cows.
- Growing/Finish: Young animals need higher nutrient density than mature animals to build muscle and bone rapidly.
Frequently Asked Questions (FAQ)
What is a 'TMR'?
Total Mixed Ration (TMR) is a method of feeding where all components (forage, grains, and supplements) are mixed together. This ensures the animal cannot "pick out" the sweet grains and omit the necessary fiber.
When should I call a nutritionist?
If your production (milk/growth) drops suddenly or if you notice metabolic diseases like ketosis, your feed ratio is likely unbalanced. A professional can run a lab test on your silage to determine the exact protein and energy values.