diff --git a/RUFAS/units.py b/RUFAS/units.py
index ebcb9821ef..18b2073f67 100644
--- a/RUFAS/units.py
+++ b/RUFAS/units.py
@@ -18,9 +18,7 @@ class MeasurementUnits(Enum):
     CENTIMETERS_PER_MILLIMETER = "cm/mm"
     CONCEPTIONS = "conception"
     CONCEPTIONS_PER_SERVICE = "conceptions per service"
-    COWS = "cows"
     CUBIC_METERS = "m^3"
-    CUBIC_METERS_PER_DAY = "m^3/day"
     CUBIC_METERS_PER_KILOGRAM = "m^3/kg"
     CUBIC_METERS_PER_LITER = "m^3/L"
     CUBIC_METERS_PER_CUBIC_MILLIMETER = "m^3/mm^3"
@@ -68,10 +66,8 @@ class MeasurementUnits(Enum):
     LITERS_PER_HA = "L/ha"
     LITERS_PER_KILOWATTS_PER_HOUR = "L/kWhr"
     MEGACALORIES = "Mcal"
-    MEGACALORIES_PER_KILOGRAM = "Mcal/kg"
     MEGAGRAMS_PER_KILOGRAM = "Mg/kg"
     MEGAJOULES = "MJ"
-    MEGAJOULES_PER_CUBIC_METER = "MJ/m^3"
     MEGAJOULES_PER_SQUARE_METER = "MJ/m^2"
     METERS = "m"
     METERS_PER_KILOMETER = "m/km"
diff --git a/tests/test_units.py b/tests/test_units.py
index 5def011d43..2b2ba2b10f 100644
--- a/tests/test_units.py
+++ b/tests/test_units.py
@@ -16,9 +16,7 @@ def test_units_member_values() -> None:
     assert MeasurementUnits.CENTIMETERS_PER_MILLIMETER.value == "cm/mm"
     assert MeasurementUnits.CONCEPTIONS.value == "conception"
     assert MeasurementUnits.CONCEPTIONS_PER_SERVICE.value == "conceptions per service"
-    assert MeasurementUnits.COWS.value == "cows"
     assert MeasurementUnits.CUBIC_METERS.value == "m^3"
-    assert MeasurementUnits.CUBIC_METERS_PER_DAY.value == "m^3/day"
     assert MeasurementUnits.CUBIC_METERS_PER_KILOGRAM.value == "m^3/kg"
     assert MeasurementUnits.CUBIC_METERS_PER_LITER.value == "m^3/L"
     assert MeasurementUnits.CUBIC_METERS_PER_CUBIC_MILLIMETER.value == "m^3/mm^3"
@@ -58,10 +56,8 @@ def test_units_member_values() -> None:
     assert MeasurementUnits.LITERS.value == "L"
     assert MeasurementUnits.LITERS_PER_CUBIC_METER.value == "L/m^3"
     assert MeasurementUnits.MEGACALORIES.value == "Mcal"
-    assert MeasurementUnits.MEGACALORIES_PER_KILOGRAM.value == "Mcal/kg"
     assert MeasurementUnits.MEGAGRAMS_PER_KILOGRAM.value == "Mg/kg"
     assert MeasurementUnits.MEGAJOULES.value == "MJ"
-    assert MeasurementUnits.MEGAJOULES_PER_CUBIC_METER.value == "MJ/m^3"
     assert MeasurementUnits.MEGAJOULES_PER_SQUARE_METER.value == "MJ/m^2"
     assert MeasurementUnits.METERS.value == "m"
     assert MeasurementUnits.METERS_PER_KILOMETER.value == "m/km"
@@ -101,9 +97,7 @@ def test_units_str_method() -> None:
     assert str(MeasurementUnits.CENTIMETERS_PER_MILLIMETER) == "cm/mm"
     assert str(MeasurementUnits.CONCEPTIONS) == "conception"
     assert str(MeasurementUnits.CONCEPTIONS_PER_SERVICE) == "conceptions per service"
-    assert str(MeasurementUnits.COWS) == "cows"
     assert str(MeasurementUnits.CUBIC_METERS) == "m^3"
-    assert str(MeasurementUnits.CUBIC_METERS_PER_DAY) == "m^3/day"
     assert str(MeasurementUnits.CUBIC_METERS_PER_KILOGRAM) == "m^3/kg"
     assert str(MeasurementUnits.CUBIC_METERS_PER_LITER) == "m^3/L"
     assert str(MeasurementUnits.CUBIC_METERS_PER_CUBIC_MILLIMETER) == "m^3/mm^3"
@@ -142,9 +136,7 @@ def test_units_str_method() -> None:
     assert str(MeasurementUnits.LITERS) == "L"
     assert str(MeasurementUnits.LITERS_PER_CUBIC_METER) == "L/m^3"
     assert str(MeasurementUnits.MEGACALORIES) == "Mcal"
-    assert str(MeasurementUnits.MEGACALORIES_PER_KILOGRAM) == "Mcal/kg"
     assert str(MeasurementUnits.MEGAJOULES) == "MJ"
-    assert str(MeasurementUnits.MEGAJOULES_PER_CUBIC_METER) == "MJ/m^3"
     assert str(MeasurementUnits.MEGAJOULES_PER_SQUARE_METER) == "MJ/m^2"
     assert str(MeasurementUnits.METERS) == "m"
     assert str(MeasurementUnits.METERS_PER_KILOMETER) == "m/km"