The Dorper sheep is a South African composite breed developed between 1940 and 1950 by crossing Blackhead Persian ewes with Dorset Horn rams. Breeders stabilized the type through inter-se mating and formed the Dorper Breed Society of South Africa in 1950. The White Dorper (Dorsian) joined in 1964. Kenya imported Dorpers in 1956 for research at Kiboko, and later the FAO-UNDP Sheep and Goats Development Project (1974–1984) introduced additional stock. Today, the Dorper Sheep Breeders Society of Kenya promotes sustainable production. Farmers, pastoralists, and ranchers widely keep Dorpers because they efficiently utilize underused feed resources.
Dorpers have a short, loose coat of mixed hair and wool, with wool concentrated on the forequarter and a clean kemp underline. They are barrel-shaped and either polled or horned, with short black or white hair on the head and neck. Black-headed animals are Dorper, while white-headed ones are White Dorper. Rams stand 62–67 cm at the withers, while ewes measure 60–63 cm. They also have medium erect ears and strong legs, which support mobility under extensive systems. Mature rams weigh 65–80 kg, while ewes weigh 55–65 kg.
The breed performs well in arid, semi-arid, and semi-tropical environments, and it also adapts to intensive systems. Dorpers graze non-selectively, so they convert underutilized feed effectively. Ewes reach reproductive age at 12–15 months and show high fertility, with lambing percentages of 150–180% and twinning rates around 10%. The breed has a long, non-seasonal breeding period, which allows year-round lambing and up to 2.25 lambs per ewe annually. Lambs grow rapidly and reach 36 kg at 3–4 months, with average daily gains of 243 g. Milk yield averages 600–800 ml per day with 5.5% butter fat.
Dorpers produce high-quality carcasses, with dressing percentages of 50–54%, and their hides fetch premium value, contributing up to 20% of carcass returns. They resist fly strike and fleece rot but remain susceptible to gastrointestinal nematodes. Overall, their hardiness, productivity, and adaptability make them a key breed for mutton production in Kenya and globally.