The word 'bullock' often appears in agricultural and livestock contexts, especially concerning cattle farming. He learned how to care for bullocks on his uncle's farm.
Pro Tip 2/3
Not Pets
'Bullock' generally implies the animal is being raised for commercial use, not as a pet or for milk production. They invested in quality feed to fatten the bullocks for market.
Pro Tip 3/3
Age-Specific
'Bullock' specifically refers to young male cows that have been castrated; age and reproductive ability are implicit. The young bullocks were separated from the older cows.