eiru_reports_farm/views/menus.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
  <data>
    <!-- main menu -->
    <menuitem id="farm_parent_menu" name="Informes" parent="farm.menu_farm" sequence="300"/>

    <!-- sub menu -->

    <menuitem id="farm_animal_history_menu" parent="farm_parent_menu" name="Listado de animales" action="farm_farm_action" sequence="3"/>


  </data>
</openerp>