ولا يجوز بيع الحمل ولا النتاج ولا بيع اللبن في الضرع والصوف على ظهر الغنم
Translation: Sale of an unborn animal, future offspring, milk still in the udder, or wool still on a sheep is disallowed in these forms.
Haml is a fetus inside the animal; nataj denotes future offspring. The former raises separate delivery and identification problems, while the latter also lacks present existence.
Milk still in the udder has uncertain quantity and extraction; wool still attached has an uncertain boundary for shearing.
The clause concerns selling these components separately, not the ordinary sale of the whole animal subject to other requirements.