Fresh Eggs Daily Brewer's Yeast with Garlic Powder Chicken & Duck Feed Supplement 5LB

Is there expiration date on this product?

Is the brewers yeast in this product human grade or livestock grade?

Is this what I need to add to my feed store chicken feed for my ducks ???

Is the measurements of 1/2 a tsp per cup of feed is the actual measuring tsp that comes in the container?