The Cattle are part of the Creation of Allah and a Blessing from Him
Allah reminds His servants of the blessing in His creation of An`am, this term includes camels, cows and sheep, as was explained in detail in Surat Al-An`am where the "eight pairs" are mentioned. The blessings include the benefits derived from their wool and hair, from which clothes and furnishings are made, from their milk which is drunk, and their young which are eaten. Their beauty is a kind of adornment, thus Allah says,
وَلَكُمْ فِيهَا جَمَالٌ حِينَ تُرِيحُونَ
(And there is beauty in them for you, when you bring them home in the evening.) which is when they are brought back from the pasture in the evening. This is a reference to how their flanks become fat, their udders fill with milk and their humps become bigger.
After human beings, mentioned there was the creation of things which were made specially for their benefit. Since the first addressees of the Qur'an were Arabs and their economic life depended on domestic cattle like camels, cows and goats, therefore, these were taken up first: وَالْأَنْعَامَ خَلَقَهَا (As for the cattle, He created them - 5).
Then, out of the benefits received by human beings from the cattle, two were particularly mentioned. (1) لَكُمْ فِيهَا دِفْءٌ (having warmth for you), that is, they use wool from them to make clothings which keep them warm during winters.
(2) The second benefit was mentioned in: وَمِنْهَا تَأْكُلُونَ (and of them you eat), that is, they can slaughter these animals and eat from their meat; and, when alive, they procure milk from them which is fine food indeed. Included here are butter, yogurt, butter-oil and everything else which fall under dairy products.
The reality of religion is that man should apprehend the Being of God and His workmanship in the universe so intensely and realistically that the Being of the one God should become everything for him; man should fear only Him and on Him alone, should he build up his hopes. The one God should be the entire focus of his heart and mind. This is what constitutes the act of making God the object of worship (ilah) and amounts to praying to Him. All the prophets came into the world in order to bring about this condition. Those who prove to have this sense of submission to God will be treated as successful on Judgement Day, but those who go against this will be left without hope. For the general people, this decision will be taken on Doomsday (Judgement Day), but for the addressees of the prophet, it starts in this world itself. There is perfect unity in the universe and at the same time, there also is perfect meaningfulness. Unity in the universe makes it unwarranted for anyone to make somebody other than the one God the centre of his attention. And it is the natural consequence of its meaningfulness that it should meet a meaningful end. In this way, the system governing the universe provides arguments in favour of both the unity of God (tawhid) and the existence of the Hereafter.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.