Let's match the terms from List-I to the most appropriate term in List-II.
A. Probiotic: This is a beneficial microorganism. \textit{Lactobacillus acidophilus} is a classic example of a probiotic bacterium. So, A matches with II.
C. Fowl: This is a general term for birds, but in this context, it refers to the domestic chicken. \textit{Gallus domesticus} is the scientific name for the domestic chicken. So, C matches with IV.
D. Starter feed: This is a specific type of feed formulated for very young animals. It is given to Chicks. So, D matches with I.
B. Hen: By elimination, Hen must match with Broilers. A hen is an adult female chicken. A broiler is a young chicken raised for meat, which can be male or female. Within the given options, this is the intended pairing. So, B matches with III.
The correct combination is A-II, B-III, C-IV, D-I.