Nutrition Flashcards
Typical maintenance need for 650kg cow
70MJ/day
Energy requirement per litre of milk produced
5MJ/day
Energy requirement for 7mo pregnant
20MJ/day
Energy requirement for pregnant at term
50MJ/day
Energy requirement for 1kg weight gain
40MJ/kg
Energy loss in requirement per 1kg loss
30MJ/kg
What is fermentable metabolic energy
Energy available to rumen microflora
carbohydrates
What energy is not availbale to rumen microflora
Fats - pass to SI for digestion
VFAs - absorbed by rumen through rumen wall
How much can a cow eat?
2.5% of BW
or 2% of BW + 10% of milk yield
Acid detergent fibre (ADF)
Cellulose and lignin (min 19% of ration)
Neutral detergent fibre
Cellulose, lignin, and hemicellulose
Recommend 30%, min 21%
Trace elements and vitamins important for health in production
○ Zinc
○ Copper - CAREFUL of toxicity
○ Manganese
○ Selenium
○ Cobalt
BCS targets
2.5-3.5
Not to lose more than 0.5BCS in early lactation
85% of cows out of range
When should peak lactation be?
30-40 days
What fat:protein ratio indicates a problem?
> 1.4
