The footage reveals the harsh reality of the dairy industry, where animals must be repeatedly impregnated to continue producing milk. The female babies are raised to join the breeding and milking cycle, while the male babies are considered useless to the industry. This particular farm is owned by millionaire John Gommans, who also owns the Gippy Goat farm (and former cafe), which was subject to a high profile protest by animal activists in late 2018.
This is yet another example of an industry with zero transparency or laws to properly govern it - everything shown in this footage is completely legal under Victoria's animal welfare legislation.