The surabhi cow is also called kamadhenu. In other words, the surabhi cow can yield milk unlimitedly. Surabhi cows are generally found on the Vaikuntha planets.
Although Jamadagni possessed only one kamadhenu, he was able to get from it everything desirable.
Thus he was able to receive the King (Kartaviryarjuna) along with the King’s great number of followers, ministers, soldiers, animals and palanquin carriers. When we speak of a king, we understand that he is accompanied by many followers. Jamadagni was able to receive all the King’s followers properly and feed them sumptuously with food prepared in ghee. The King was astonished at how opulent Jamadagni was because of possessing only one cow, and therefore he became envious of the great sage. This was the beginning of his offense.
The surabhi cow is described as havirdhani, the source of butter. Butter, when clarified by melting, produces ghee, or clarified butter, which is inevitably necessary for performing great ritualistic sacrifices. As stated in Bhagavad-gita (18.5), yajna-dana-tapah-karma na tyajyam karyam eva tat: sacrifice, charity and austerity are essential to keep human society perfect in peace and prosperity. Yajna, the performance of sacrifice, is essential; to perform yajna, clarified butter is absolutely necessary; and to get clarified butter, milk is necessary. Milk is produced when there are sufficient cows. Therefore in Bhagavad-gita (18.44), cow protection is recommended (krsi-go-raksya-vanijyam vaisya-karma svabhava jam).