backfash

例句：

1. 1. The cow has a lot of backfash, which is not good for its health.
   这头牛的背膘很多，这对它的健康不好。
2. 2.The farmer was worried about the backfash in the pigs, as it could affect their growth.
   农民担心猪的背膘问题，因为这会影响它们的生长。
3. 3.To improve the quality of meat, the breeder needs to control the backfash in the cattle.
   为了提高肉品的质量，育种者需要控制牛的背膘。