Animal Science Terms - O

Old drake: male duck over 1 year of age

Old duck: female duck over 1 year of age 

Old goose:female goose over 1 year of age

Old hen: female turkey over one year of age 

Old tom: male turkey over 1 year of age

Omasum: third compartment of a ruminant’s stomach located between the reticulum and the abomasum. It removes excess water from food and further reduces the size of food particles before passing them to the abomasums for digestion by enzymes. Known as manyplies

Omega-3 fatty acid: family of fatty acids based on the presence of a double bond in the 3rd carbon from the methyl end of the molecule. Linolenic acid (18:n3n) is an essential omega-3 fatty acid because it cannot be synthesized by mammals.

Omega-6 fatty acid: family of fatty acids based on the presence of a double bond in the 6th carbon from the methyl end of the molecule. Linoleic acid (18:2n6) is an essential omega-6 fatty acid because it cannot be synthesized by mammals

Oogenesis: formation, development, and maturation of an ovum or egg cell

Open: female that is not pregnant

Open Shoulders (Loose shoulders): shoulder blades are structurally too far apart at the top which makes it difficult for the animal to stand for long periods or to move around freely

Optiflex: feed additive sometimes given to animals raised for meat

Organic: 1. Involving organisms or the products of their life processes. 2. Relating to chemical compounds containing carbon

Organic matter: total weight of the feed minus the mineral content

Organic Milk: milk and milk products can be labeled “USDA organic” if the milk comes from farms that meet USDA’s National Organic Program standards. Organic milk is just one of many options in the dairy case to fit different lifestyles and personal preferences

Outbreeding (Outcrossing): mating together of animals that are not closely related. Mild outbreeding is illustrated by mating cows to a sire of their own breed but who is not closely related to them. Such outcrossing may widen the genetic base in a herd and reduce inbreeding accumulation. A higher level of outcrossing is illustrated by crossing two Bos taurus breeds. This generally would result in beneficial heterosis for economically important traits

Over-Conditioned: animal that is excessively fat often due to over feeding

Overshot or Parrot Mouth: animal that has the lower jaw shorter than the upper jaw and the lower teeth hit the back of the dental pad. This is disqualifying feature for confirmation

Ovine: relating to sheep

Ovulation: release if an egg cell (ovum) from the ovary in female animals, regulated in mammals by hormones produced in the pituitary glands during the menstrual cycle

Ox: castrated bull trained to work and at least 4 years of age

Oxen: plural of ox

 

 

Back to Animal Science