Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease.

用于食用的牛和鸡经常被喂食会传播病毒的饲料，该病毒引起这种疾病。

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Corn is a prime source of feed for dairy cattle and the rising costs could force farmers to reduce their herds, leading in turn to reduced supplies.

玉米是乳用牛饲料的主要来源，价格上涨将迫使农民减少饲养牲口数，进而导致供给减少。

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For instance, several kinds of birds feed on insects flushed out of the grass by grazing cattle.

例如，几种鸟类以被放牧牛驱赶的昆虫为食。

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