diff --git a/nutrition_program.py b/nutrition_program.py
index 1138127..163be8e 100644
--- a/nutrition_program.py
+++ b/nutrition_program.py
@@ -17,6 +17,7 @@ class NutritionProgram(ModelSQL, ModelView):
     start_weight = fields.Float('Start Weight')
     end_weight = fields.Float('End Weight')
     product = fields.Many2One('product.product', 'Product', required=True)
+    animal_product = fields.Many2One('product.product', 'Animal Product')
     bom = fields.Function(fields.Many2One('production.bom', 'BOM',
         domain=[
             ('output_products', '=', Eval('product', 0)),
@@ -48,16 +49,19 @@ class StockLot:
         if not animal:
             return
 
-        domain = [('product', '=', self.product)]
+        domain = [('animal_product', '=', self.product)]
+        order = [('end_weight', 'DESC')]
+        weight_domain = []
         if animal.current_weight:
             weight = animal.current_weight.weight
-            domain.extend([
+            weight_domain = [
                         ('start_weight', '<=', weight),
                         ('end_weight', '>=', weight),
-                    ], )
-        programs = Program.search(domain, order=[
-                ('end_weight', 'DESC'),
-            ], limit=1)
+                    ]
+        programs = Program.search(domain + weight_domain, order=order, limit=1)
+        if len(programs) > 0:
+            return programs[0].id
+        programs = Program.search(weight_domain, order=order, limit=1)
         if len(programs) > 0:
             return programs[0].id
 
diff --git a/tests/scenario_nutrition_program.rst b/tests/scenario_nutrition_program.rst
index c019595..971a19e 100644
--- a/tests/scenario_nutrition_program.rst
+++ b/tests/scenario_nutrition_program.rst
@@ -85,6 +85,15 @@ Create products::
     >>> group_template.save()
     >>> group_product = Product(template=group_template)
     >>> group_product.save()
+    >>> grain_template = ProductTemplate(
+    ...     name='Graing',
+    ...     default_uom=unit,
+    ...     type='goods',
+    ...     list_price=Decimal('40'),
+    ...     cost_price=Decimal('25'))
+    >>> grain_template.save()
+    >>> grain_product = Product(template=grain_template)
+    >>> grain_product.save()
 
 Create sequence::
 
@@ -177,7 +186,8 @@ Create nutrition program::
     >>> nutrition_program = NutritionProgram(
     ...     start_weight=10.0,
     ...     end_weight=30.0,
-    ...     product=individual_product)
+    ...     product=grain_product)
+    ...     animal_product=individual_product)
     >>> nutrition_program.save()
     >>> individual.lot.nutrition_program == None
     True
@@ -202,7 +212,8 @@ Create another nutrition program::
     >>> nutrition_program2 = NutritionProgram(
     ...     start_weight=50.0,
     ...     end_weight=70.0,
-    ...     product=individual_product)
+    ...     product=grain_product)
+    ...     animal_product=individual_product)
     >>> nutrition_program2.save()
     >>> AnimalWeight = Model.get('farm.animal.weight')
     >>> kg, = ProductUom.find([('name', '=', 'Kilogram')])
diff --git a/view/nutrition_program_form.xml b/view/nutrition_program_form.xml
index 07a4d90..0e1d463 100644
--- a/view/nutrition_program_form.xml
+++ b/view/nutrition_program_form.xml
@@ -10,4 +10,6 @@
     <field name="product"/>
     <label name="bom"/>
     <field name="bom"/>
+    <label name="animal_product"/>
+    <field name="animal_product"/>
 </form>