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Genetics

Homozygous polled

Homozygous polled · P/P About Polled

Two copies are recorded for this trait.

Dominant

How do you know?

Reported by owner

Known risk: In genetic females (XX), two copies cause polled intersex syndrome: the goat is infertile, and its outward sex can range from almost female to almost male.

Simon R, Drogemuller C, Luhken G 2022, 'The Complex and Diverse Genetic Architecture of the Absence of Horns (Polledness) in Domestic Ruminants, including Goats and Sheep', Genes 13:832 (review; same Giessen/Bern group as Simon 2020)OMIA (Online Mendelian Inheritance in Animals), OMIA:000483-9925 Polled/Horns in Capra hircusPailhoux E et al. 2001, 'A 11.7-kb deletion triggers intersexuality and polledness in goats', Nature Genetics 29:453-458

Reported risk: In genetic males (XY), two copies are reported to cause sperm granulomas and reduced fertility; recent reviews call the evidence unclear.

Soller M, Padeh B, Wysoki M, Ayalon N 1969, 'Cytogenetics of Saanen goats showing abnormal development of the reproductive tract associated with the dominant gene for polledness', Cytogenetics 8:51-67 (abstract on Hebrew University research portal; OCR typos are in the source)American Nigerian Dwarf Dairy Association (ANDDA), 'Polled Intersex Gene', by Joane Karohl PhD, 13 Jan 2023Simon R, Drogemuller C, Luhken G 2022, 'The Complex and Diverse Genetic Architecture of the Absence of Horns (Polledness) in Domestic Ruminants, including Goats and Sheep', Genes 13:832 (review; same Giessen/Bern group as Simon 2020)
Polled example
Example · AI illustration
Appearance varies