Sexing

This article is about sex discernment in non-human animals. For humans, see Determination of sex.
Not to be confused with Sexting.

Sexing or gender identification[1] is the process of determining the sex of an individual animal. Through sexing, biologists and agricultural workers determine the sex of livestock and other animals they work with. The specialized trade of chicken sexing has a particular importance in the poultry industry.

The sex of mammals can often be determined using sexually dimorphic characteristics.[2] Assisted physical sexing is relevant in vertebrates with cloacae (e.g. birds, reptiles or amphibians) when there is no external sexual dimorphism. In veterinary practice, fibroscopy is used under general anaesthesia in birds such as parrots.[3]

Molecular sexing is a set of techniques that use DNA for determining sex in wild or domestic species[4] (population studies, farming, genetics) or humans (archaeology, forensic medicine[5]). Markers commonly used include amelogenin, SRY and ZFX/ZFY. Various techniques have been developed using simple polymerase chain reaction product size dimorphism, presence/absence, restriction dimorphism, or even sequencing.

  1. ^ Ammer, F. K.; Wood, P. B.; McPherson, R. J. (2008). "Gender Identification of Grasshopper Sparrows Comparing Behavioral, Morphological, and Molecular Techniques". The Wilson Journal of Ornithology. 120 (1): 221–225. doi:10.1676/07-002.1.
  2. ^ Kunz, Thomas H.; Wemmer, Chris; Hayssen, Virginia (1996). "Sex, age, and reproductive condition of mammals". In Wilson, DE; Cole, FR; Nichols, JD; Rudran, R.; Foster, MS (eds.). Measuring and monitoring biological diversity: standard methods for mammals (PDF). Washington, DC: Smithsonian Institution Press. pp. 279–290.
  3. ^ Satterfield, William C. (1 September 1990). "Avian Endoscopy". Veterinary Clinics of North America: Small Animal Practice. 20 (5): 1353–1367. doi:10.1016/S0195-5616(90)50309-5. ISSN 0195-5616. PMID 2238375.
  4. ^ Fernando, Prithiviraj; Melnick, Don J. (2001). "Molecular sexing eutherian mammals" (PDF). Molecular Ecology Notes. 1 (4): 350–353. doi:10.1046/j.1471-8278.2001.00112.x.[dead link‍]
  5. ^ "forensic medicine | Definition & Facts". Britannica. Retrieved 20 October 2022.