Changes

|a2= In mice, mammary tumors are frequently malignant, invasive and difficult to remove. They are associated with infection by the mouse mammary tumor virus.

|a2= In mice, mammary tumors are frequently malignant, invasive and difficult to remove. They are associated with infection by the mouse mammary tumor virus.

In guinea pigs, about 70% of the mammary gland tumors are benign fibroadenomas and 30% are mammary adenocarcinomas.

In guinea pigs, about 70% of the mammary gland tumors are benign fibroadenomas and 30% are mammary adenocarcinomas.

|l2=

|l2= Mammary Neoplasia

|q3= What would you recommend to prevent the occurrence of these tumours in pet rats?

|q3= What would you recommend to prevent the occurrence of these tumours in pet rats?

|a3= Ovariohysterectomy at a young age may decrease the incidence of mammary gland tumours and can be recommended to owners of female pet rats.

|a3= Ovariohysterectomy at a young age may decrease the incidence of mammary gland tumours and can be recommended to owners of female pet rats.