Bull testicles are the testicles of bulls, also known as bull's eggs, which are the reproductive organs of bulls. Bull testicles are rich in protein, fat, amino acids, vitamins and minerals and other nutrients. However, bovine testicles are high in fat and cholesterol, making them unsuitable as a major source of protein in the daily diet.

If you feel like sand when you eat bull testicles, it may be due to the high fat and cholesterol content in them, resulting in a rougher texture. In addition, the high protein and amino acid content in bull testicles may result in a more astringent taste. Therefore, it is recommended that you consume bull testicles in moderation to avoid overconsumption.