questions: query regarding swelling in abdomen of a pregnant cow reaching last month of gestation 
 answers: the lymph node may  sometime swell in terminal stage . cyst may develope in some cases . sterilise the area with betadine . spray topicure on the area . let the cow for utokia ( normal & safe parturation ) the condition may also be inguinal hernia . if it is herniation then after giving birth go for line of treatment in both the case