"The future is foretold by the sparks from the fire. The more sparks there are, and the bigger and brighter the sparks, the richer the harvest,
milkier : good guess! One might predict that from other examples in English. However, what that means is: Cadbury's make milk chocolate bars, but Nestles are milkier. Hence, if we eat these cows...
There may be some technical term for it, to do with lactation, but I think it's simpler to say:
the more milk from cows, and the more fattened the cattle will be. "
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