Lab Exam 1 Flashcards
How do you find % dry matter of feed
Sample size in g. — feed moisture in g / sample size in g x 100
How do you find % OM of a feed
Dry matter amount in g — ash in g / sample size in g x by 100
How do you find % NFE of feed
100 — ( percents of feed moisture + crude protein+ ether extract, crude fiber - ash, ash)
How do you find percents of feed moisture, crude protein, ether extract, crude fiber and ash, lignin and ash
Divide the feed moisture, crude protein, ether extract, crude fiber and ash, lignin and ash by sample size.
What are examples of green forages
Bermuda grass, Kentucky blue grass, rye grass, tall fescue
What is the reasoning for the classification of green forages
At least 18% CF, Moisture 50-85%, high in cellulose and hemicellulose , low digest ability and low energy
What are examples of energy concentrates
Corn, wheat, sorghum, oats
What is the reasoning for classifying energy concentrates
Less than 8% CF, Less than 20% protein, Hugh in starch and soluble carbohydrates
What are examples of protein suppplements
Canola meal, fish meal, soybeans, cowpeas
What classifies protein supplements
Protein greater than 20%,
What are examples of non nutritive feed additives
Antioxidants, antibiotics, enzymes, buffers
What is the reasoning for classifying non nutritive feed additives
Do not provide any nutrients
How do you calculate the proportion of grass, legume, weeds, and dead material in a forage
(Grass/ legume / weeds/ dead material in available DM in kg) / total sample size x 100 = % in sample
How do you find how many days it takes ___ calves to eat ___ DM/day, with ___% yield
- find area of quadrant: convert area of quadrant give information and turn it into meters (___ in x 0.0254 m)
- find the forage yield: total amount of grass, legume, weed, dead material (table)
- Find area covered by acres of pasture: area of pasture field x 4000 m^2
- find the area covered by area of pasture area in (step 3) m^2 pasture area -> (step 3) m^2 x total grass, legume, etc./ area of quadrant step 1 in m^2
- find daily DM intake of calves: __ kg DM/day x # cows
- find number of days that calves remian on pasture: step 5 x y days = (step 4 + ((daily forage accumulation/ growth x area of pasture field) x __y__ days)) x residual/ 100
how do you find amount of calves needed if grazed for y days and has z residual
kg DM/day x n calves x y days = ____ + (____ x y days) with blanks being 2nd line of calculation (ex: 50.0x = 2067.5 + 19.089x, blanks is 2067.5 and 19.089) then find x
