ANIMAL SCIENCE FEEDS CALCULATIONS: 1.After learning the concepts of dry matter a
ID: 3121443 • Letter: A
Question
ANIMAL SCIENCE FEEDS CALCULATIONS:
1.After learning the concepts of dry matter and as fed, you realize you have been spending a lot of money on canned dog food and want to switch to dry food for your pet. The canned food you have been feeding is 8% crude protein on an as fed basis, and the food is 78% moisture. The new food you are considering is 28% CP and 12% moisture. How do these 2 dog foods compare in protein as you decide whether to switch to this new dog food?
2.Formulate 100 pounds of a mixed feed that is 16% CP using corn and soybean meal. The corn is 87% DM, 9% CP on a DM basis. The soybean meal is 88% DM, 49% CP on a DM basis. In this diet, you must add vitamins and minerals, so you have to allow for 5% slack space. Remember, you must calculate the ration on a DM basis, then convert to As Fed basis (so you know how much of each feed to weigh to put in the mixer). You are making the 100 pounds on a dry matter basis, so your final amounts of corn and SBM will add up to be more than 100 pounds on an as-fed basis.
3.A 600 kg horse doing moderate work has a crude protein requirement of 2.57 lbs. of crude protein (CP) per day and a digestible energy (DE) requirement of 29.1 mcal of DE per day.
Use oats and grass/clover hay to formulate a diet for the horse. The oats contain 13% CP and 1.7 Mcal DE/ lb and is 89%DM. The hay contains 18% CP and 1.1 Mcal DE/ lb on a DM basis, and is 90% DM.
Make sure to include how many pounds of oats and hay you will need, both on Dry Matter basis and an As Fed basis.
Explanation / Answer
1. Given: canned food data:
crude protein = 8%
Moisture = 78%
New food data :
CP = 28%
Moisture = 12%
Here amount of dry matter is (100-12)=88%
Dry matter protein content = (28/88)×100= 31.81%
But for the first food,
Amount of dry matter = (100-78)= 22%
Hence dry matter protein content = (8/22)×100= 36.36%
Hence food 1 has more dry matter protein than second one.