close up of veterinarian holding containing straws for impregnating cows in liquid nitrogen bank. livestock

agriculture animal artificial bank beef biotechnology bovine breeding bull business cells close container containing cow cows cryogenic cultivation dna evolution farming fecundation fertilization freeze gene health holding husbandry impregnating impregnation improvement industry insemination instrument lab liquid livestock manipulation mating nitrogen nucleic penetration pregnant reproduction research ricultural science selection semen sperm straws tank technology vapour veterinarian