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  1. Only showing results from www.ars.usda.gov

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  2. The Polypay sheep breed was developed at the U.S. Sheep Experiment Station in the late 1970's. The breed has a reproductive capacity markedly superior to that of domestic western range breeds.The Polypay is a four breed composite of Targhee, Rambouillet, Dorset and Finnish Landrace breeds. It is a medium-sized wool sheep with a smooth body and ...
  3. The objective of this study was to document and compare genetic trends in production traits of three dual-purpose breeds of sheep (Rambouillet, Columbia and Targhee) at the United States Sheep Experiment Station (USSES), Dubois, ID, over a 49-yr period (1950-1998). Selection was based on weaning performance under range conditions.
  4. The RSPER genetics database for Rambouillet, Targhee, Polypay, and Suffolk breeds will be uploaded to the Nat'l Sheep Improvement Prog. (NSIP) database. In order to develop NSIP-relevant linkages, a nation-wide sampling of NSIP Rambouillet, Targhee, Merino, and Merino-composite rams across the nation will be purchased from the industry and ...
  5. The Composite-IV is a sheep breed developed at the U.S. Meat Animal Research Center and has been selected for enhanced reproductive efficiency in a lower-input system. Composite-IV ewes were evaluated alongside Katahdin and Polypay ewes, two other popular maternal sheep breeds, over 4 years in a lower-input, pasture lambing system.
  6. The following breeds were found to have relatively high inbreeding: Columbia (0.60), Gulf Coast Native (0.54), Jacob (0.52), and Targhee (0.62) suggesting genetic diversity is an issue for rare breeds and some commercially popular breeds. The average number of alleles per breed ranged from 3.67 (Black Welsh Mountain) to 7.89 (Rambouillet).
  7. The sheep industry contributes nearly $6 billion annually to the US economy, with growing ethnic diversity strengthening demand. Sheep farms outnumber dairy cattle, pig, and broiler enterprises, with distinctive breed-types dispersed across climatically-diverse regions and management systems.
  8. Classification of breeds Sheep breeds can be classified in many different ways. For example, fineness of wool is a common method. Because this manuscript addresses use of breeds for meat production, breeds will be classified based on roles in crossbreeding systems, that is, as general purpose breeds, specialized dam
  9. Genotypes for both codons were not different between these groups of Targhee and Suffolk sheep. In unselected populations, genotypic frequency is expected to be 25% AA, 50% AV, and 25% VV. However, in this sample of sheep, the presences of valine was reduced in both breeds (13% AV and 0% VV) because USSES has been selecting against valine.
  10. Within mature ewes (2- to 5-yr-old), twin litters were most frequent (58.7%), triplets intermediate (24.7%), and singles least (16.6%). Results indicated lamb survival and number of lambs weaned were greater but total weight of lamb weaned lower for Composite IV sheep than other breed types reported in range- or pasture-lambing systems.
  11. ic diversity of sheep breeds facilitates in situ and ex situ conservation activities. A comprehensive evaluation of US sheep breeds has not been previously performed; therefore, we evaluated the genetic diversity among and within 28 US sheep breeds. Both major and minor breeds were included in the analysis and consisted of
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