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



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