Hair Sheep: Difference between revisions
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Although the exact date is unknown, it is hypothesized that hair sheep originated in the early 16th century, beginning with the St. Croix breed. All sheep breeds, both hair breeds and wool breeds, share the same ancestral source; the Mouflon sheep.1 All breeds have 27 pairs of chromosomes, allowing for crossbreeding between the breeds. Each breed of hair sheep originated at different times and in different places. The Barbados Blackbelly can be traced back to Africa where an unknown European wool breed was crossed with an African hair sheep. Sheep produced from this cross with high quality meat and heat tolerance were then genetically selected for, resulting in a new breed. The Dorper sheep were produced from a cross between a Dorset Horn wool sheep and a Blackhead Persion hair sheep in South Africa. Offspring tolerant to arid conditions were genetically selected for. The Katahdin sheep were produced in Maine from a cross of three african hair sheep from St. Croix and several different wool breeds. Hardy, adaptable, low maintenance, and parasite resistant offspring were then genetically selected for. The St. Croix sheep originated in the British Virgin Islands and are speculated to be a cross between Wiltshire Horn and Criollo sheep. Natural and human genetic selection has led to the sheep being adaptable to climate, fertile, parasite resistant, and docile. This breed has especially desirable adaptations for tropical regions.<br> | |||
<ref name=" abc "></ref> | <ref name=" abc "></ref> | ||
Include some current research, with at least one image. | Include some current research, with at least one image. | ||
Revision as of 00:25, 11 December 2024
Introduction
Hair sheep are a breed of sheep characterized by their coat composed of more hair fibers than wool fibers, the characteristic in which they differ from domesticated wool sheep. It is currently estimated that hair sheep make up about 7-10% of the world sheep population.1 There are two classes of hair sheep: true hair breeds and composite breeds. True hair breeds originated from, and are found in tropical climates. True hair sheep have pure hair coats and exhibit the main characteristics of hair sheep such as parasite resistance, efficient reproduction, and slow growth. Composite breeds of hair sheep are crosses between pure hair breeds and wool breeds. They are characterized by their mix of hair breed characteristics and wool breed characteristics. Therefore, similar to wool breeds, on average composite breeds grow faster than hair breeds, have heavier muscle mass, and are less parasite resistant. Hair sheep belong to the taxonomic class Mammalia, that contains other domesticated wool sheep as well as all other mammals. Specifically, they belong to the subgroup Caprinae, which also contains goats and horned sheep. There are several species of hair sheep including the Barbados Blackbelly, the St. Croix, the Wiltshire Horn, the Katahdin, the Dorper, and the Royal White. These species are separated mostly by their origin location. However, some of these are composite breeds, and are therefore classified by the breeds bred together to create them.
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Legend/credit: Electron micrograph of the Ebola Zaire virus. This was the first photo ever taken of the virus, on 10/13/1976. By Dr. F.A. Murphy, now at U.C. Davis, then at the CDC.
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Section 1 Evolution
Although the exact date is unknown, it is hypothesized that hair sheep originated in the early 16th century, beginning with the St. Croix breed. All sheep breeds, both hair breeds and wool breeds, share the same ancestral source; the Mouflon sheep.1 All breeds have 27 pairs of chromosomes, allowing for crossbreeding between the breeds. Each breed of hair sheep originated at different times and in different places. The Barbados Blackbelly can be traced back to Africa where an unknown European wool breed was crossed with an African hair sheep. Sheep produced from this cross with high quality meat and heat tolerance were then genetically selected for, resulting in a new breed. The Dorper sheep were produced from a cross between a Dorset Horn wool sheep and a Blackhead Persion hair sheep in South Africa. Offspring tolerant to arid conditions were genetically selected for. The Katahdin sheep were produced in Maine from a cross of three african hair sheep from St. Croix and several different wool breeds. Hardy, adaptable, low maintenance, and parasite resistant offspring were then genetically selected for. The St. Croix sheep originated in the British Virgin Islands and are speculated to be a cross between Wiltshire Horn and Criollo sheep. Natural and human genetic selection has led to the sheep being adaptable to climate, fertile, parasite resistant, and docile. This breed has especially desirable adaptations for tropical regions.
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Section 2 Microbiome
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References
- ↑ 1.0 1.1 1.2 Zigli DD, Brew L, Obeng-Denteh W, Kwofie S. On the Application of Homeomorphism on Amoeba Proteus. Ghana Journal of Technology. 2021 Mar 31;5(2):43-7.
- ↑ Bartlett et al.: Oncolytic viruses as therapeutic cancer vaccines. Molecular Cancer 2013 12:103.
- ↑ Lee G, Low RI, Amsterdam EA, Demaria AN, Huber PW, Mason DT. Hemodynamic effects of morphine and nalbuphine in acute myocardial infarction. Clinical Pharmacology & Therapeutics. 1981 May;29(5):576-81.
- ↑ 4.0 4.1 text of the citation
- ↑ 5.0 5.1 Murphy A, Barich D, Fennessy MS, Slonczewski JL. An Ohio State Scenic River Shows Elevated Antibiotic Resistance Genes, Including Acinetobacter Tetracycline and Macrolide Resistance, Downstream of Wastewater Treatment Plant Effluent. Microbiology Spectrum. 2021 Sep 1;9(2):e00941-21.
Edited by [Author Name], student of Joan Slonczewski for BIOL 116, 2024, Kenyon College.
