And indeed, for you in grazing livestock is a lesson. We give (16:66)

Almuntakhab Fi Tafsir Alquran Alkarim

And you certainly have a sermon in cattle, serving as an incitement and exhortation to you people. We supply you with a drink from their bellies, a drink produced -under specific circumstances- in the breasts by conjoint action between chyle -the product of chyme or digested food in the intestines- and blood -which carries to the breasts all necessary aliment and elements- and there flows wholesome Milk, pure white and palatable to those who drink it

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(16:66) And surely there is a lesson for you in the cattle: We give you to drink of that which is in their bellies between filth and blood, that is, pure milk, *54 which is very pleasant to those who drink it.

And indeed, for you in grazing livestock is a lesson. We give meaning

*54) "....between filth and blood......":This refers to the most wonderful process of the formation of pure milk in the bellies of the she-cattle, for, the fodder they eat turns into blood, filth and pure milk, which is altogether different from the first two in its nature, colour and usefulness. Some she-cattle produce milk in such abundance that after suckling their young-ones a large quantity of it is left to make excellent human food.
 

And indeed, for you in grazing livestock is a lesson. We give meaning in Urdu

اور تمہارے لیے مویشیوں میں بھی ایک سبق موجود ہے اُن کے پیٹ سے گوبر اور خون کے درمیان ہم ایک چیز تمہیں پلاتے ہیں، یعنی خالص دودھ، جو پینے والوں کے لیے نہایت خو ش گوار ہے