The Bean Trees Minor Characters Quotes

Lee Sing shook her head as she rang the cash register, and muttered something that sounded to Lou Ann like "New Year pig."
"Beg your pardon?" Lou Ann was a little afraid of Lee Sing, who often said peculiar things like this.
"Feeding a girl is like feeding the neighbor's New Year pig. All that work. In the end, it goes to some other family." (2.25-27)

What does Lee Sing mean when she says that raising a daughter is a form of work that only ever benefits "some other family"? Is this true for Ivy Logan and Lou Ann? What about Alice Greer and Taylor? What about Ms. Sing and Lee Sing herself? Is it less weird to compare girls to pigs when Taylor already named her foster daughter after a turtle?