Sentence:  They count a cow's <WSD>warping</WSD> her calf a month before her time not to be so bad as an ewe's losing her lamb. / ... / [A]n ewe that had <WSD>warped</WSD> her lamb very early might sometimes have another within the year[.] 
Meaning of the word marked with <WSD> tags:  To bring forth (young) prematurely.