Animal Science Terms - J
Jack: male donkey (Equus asinus). A young jack are not referred to as colt
Jackstock: plural referring to American Mammoth jacks and jennets. These animals are properly termed asses and are not referred to as donkeys, and never called burros
Jennet (Jenny): female donkey (Equus asinus). A young jennet or jenny is not referred to as a filly
Jennet jack: male donkey (Equus asinus) used to produce donkeys
Jersey: breed of dairy cattle that is renowned for the high butterfat content of its milk. Jersey cows are smaller than other breeds (800 to 1,200 pounds) and are known for their big eyes, honey-brown color and docile nature
Jog: western term for a slower, more relaxed trot
John: informal term for a male mule
Johne’s Disease (Mycobacterium paratuberculosis): bacterial disease that is contagious, chronic, and usually fatal infection that affects primarily the small intestine of ruminants causing severe weight loss and some diarrhea