farm/views/product.xml

<?xml version="1.0" encoding="UTF-8"?>
    <openerp>
        <data>
        <record id="product_template_form_farm_view" model="ir.ui.view">
            <field name="name">product.template.common.farm.form</field>
            <field name="model">product.template</field>
            <field name="inherit_id" ref="product.product_template_form_view"/>
            <field name="arch" type="xml">
                <notebook position="inside">
                <page string="Farm">
                    <group col="4" colspan="2">
                        <field name="farrowing_price"/>
                        <field name="wearing_price"/>
                    </group>
                </page>
            </notebook>
            </field>
        </record>            
        </data>
    </openerp>