Navigation Links
Analyzing the sheep genome for parasite resistance
Date:10/18/2011

This release is available in Spanish.

Genetic resistance to a parasitic nematode that infects sheep has been discovered by a team of scientists with the U.S. Department of Agriculture (USDA) and the International Livestock Research Institute (ILRI).

The researchers are the first to detect quantitative trait loci (QTL), genetic locations on chromosomes, for resistance to gastrointestinal nematode parasites in a double-backcross population derived from African native sheep. The parasites, common in tropical regions, cause significant economic and production losses in Africa each year. Sheep infected with parasites suffer from diarrhea, anemia, weight loss and sometimes death.

Geneticist Tad Sonstegard at the Agricultural Research Service (ARS) Henry A. Wallace Beltsville Agricultural Research Center in Beltsville, Md., and researchers at ILRI in Kenya hope to identify genes that increase tolerance to parasites and improve production of grazing animals. ARS is USDA's chief intramural scientific research agency, and this research supports USDA's priority of promoting international food security.

In one study, researchers mapped the regions of the genome that control resistance to gastrointestinal nematode parasites in a sheep population bred by ILRI. Hybrid rams were produced by mating a Red Maasai, which is tolerant to gastrointestinal parasites, to a Dorper, a breed that is more susceptible to the parasite. Several of the hybrid ram offspring were then bred to either Red Maasai or Dorper ewes to complete the backcross.

Scientists genotyped 20 percent of the backcross progeny to map QTL that affect parasite-resistance traits. Blood packed-cell volume and fecal egg count-indicators of parasites-were collected for three months from more than 1,060 lambs that grazed on parasite-infected pastures. Scientists selected lambs for genotyping based on parasite indicators. They detected significant QTL for average fecal egg count and packed-cell volume on chromosomes 3, 6, 14, and 22.

Future studies will focus on genotyping the same animals using the OvineSNP50, according to Sonstegard. The OvineSNP50 is a powerful tool that can examine more than 50,000 locations in the genome.

Findings from this research were published online in Animal Genetics in May 2011.


'/>"/>

Contact: Sandra Avant
sandra.avant@ars.usda.gov
301-504-1627
United States Department of Agriculture - Research, Education and Economics
Source:Eurekalert

Related biology news :

1. Analyzing agroforestry management
2. Analyzing long-term impacts of biofuel on the land
3. NSF awards $10M to develop computing techniques for measuring and analyzing child behavior
4. Sorting device for analyzing biological reactions puts the power of a lab in a researcher’s pocket
5. Worlds largest sheep an international traveler
6. Ladybirds -- wolves in sheeps clothing
7. Alperujo -- a beneficial complement in diet of dairy sheep during non-grazing periods
8. Study shows male erectile dysfunction drug enhances fetal growth in female sheep
9. Mary had a lot of lambs: Researchers identify way to accelerate sheep breeding
10. Counting sheep in climate change predictions
11. Farmers can spot lame sheep, but fail to prevent footrot spread
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/16/2017)...   Bridge Patient Portal , an enterprise ... EMR Systems , an electronic medical record solutions ... established a partnership to build an interface between ... Centricity™ products, including Centricity Practice Solution (CPS), Centricity ... new integrations will allow healthcare delivery networks using ...
(Date:4/17/2017)... 17, 2017 NXT-ID, Inc. (NASDAQ: NXTD ... filing of its 2016 Annual Report on Form 10-K on Thursday ... ... available in the Investor Relations section of the Company,s website at ... website at http://www.sec.gov . 2016 Year Highlights: ...
(Date:4/11/2017)... April 11, 2017 No two people ... at the New York University Tandon School of ... have found that partial similarities between prints are ... in mobile phones and other electronic devices can ... The vulnerability lies in the fact that fingerprint-based ...
Breaking Biology News(10 mins):
(Date:10/10/2017)... ... October 10, 2017 , ... San Diego-based team building and ... rebranding initiative announced today. The bold new look is part of a transformation ... moves into a significant growth period. , It will also expand its service offering ...
(Date:10/10/2017)... ... 2017 , ... For the second time in three years, ... Award. Representatives of the FirstHand program travelled to Washington, D.C. Tuesday, October 10th, ... mission is to change the trajectory of STEM education in America by dramatically ...
(Date:10/10/2017)... Parks Associates announced today that Tom Kerber , Director ... , October 11 in Scottsdale, Arizona . Kerber will ... safety and security products impact the competitive landscape. ... Parks Associates: Smart Home Devices: Main Purchase Driver ... "The residential security market has experienced continued growth, and the introduction of ...
(Date:10/10/2017)... BARBARA, CALIFORNIA (PRWEB) , ... October 10, 2017 ... ... management, technological innovation and business process optimization firm for the life sciences and ... BoxWorks conference in San Francisco. , The presentation, “Automating GxP Validation ...
Breaking Biology Technology: