Building the foundations for genomic selection in U.S. sheep

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Sheep GEMS News Brief 4 – mid-August 2024 The Sheep GEMS project, together with NSIP members and other sheep industry organizations, have been working to create the building blocks for the implementation of genomic selection in the U.S. sheep industry. In this second article of the Sheep GEMS update related to genomic predictions, we describe the practical aspects for application of genomic selection in our industry. Genomic selection is the process by which genomically-enhanced estimated breeding values (GEBV) are used for selection of individuals to become the parents of the next generation. The first question one may ask is “How…

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Genomic selection: a new era in U.S. sheep breeding

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Sheep GEMS News Brief 3 – July 2024 Genomic information has been used in many livestock breeding programs for four primary applications: 1) parentage identification, 2) identification of carriers of genetic conditions, 3) evaluation of individual and populational genetic diversity, and 4) prediction of the genetic merit of selection candidates to be used for breeding. These applications show that genomic information has multiple uses key to implementing sustainable breeding programs. The U.S. sheep industry has recognized the added value of genomics and is moving to incorporate it into its genetic evaluations thought the National Sheep Improvement Program (NSIP). In this…

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Biosecurity Testing

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Sheep can be affected by infectious diseases that affect the productivity of your flock. Some diseases can only be transmitted by close contact between sheep, as the organisms responsible only survive in the environment for a short time. Other diseases can be spread via people, vehicles, birds, insects and wildlife, as the organisms responsible can survive in the environment for extended periods of time. It is easier to keep diseases that are spread directly from one sheep to another out of your flock: Make sure that your animals stay confined to your property Keep other sheep fenced out of your…

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Three Common Genetic Defects to Look for when Buying or Selling Sheep

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As the 4th Annual EAPK sale approaches, we’re expecting some very high quality Katahdins available for purchase in our unique sale format.  This hybrid sale gives eligible consignors the option to either physically bring their animals to the EAPK Symposium & Sale or consign them to the online sale only.  Buyers attending the EAPK Symposium will have an advantage in that they will have the opportunity to talk to the breeder and inspect the animals they’re interested in purchasing.  Because some breeders may be unable to attend, they will still have the option of consigning animals to the online auction…

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It is all about the interactions

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Sheep GEMS News Brief 2 – May 2024 As a reminder, GEMS stands for Genetics, Environment, Management and Society. In Sheep GEMS we are interested in the interactions among these elements of a production system. As our starting point, we focused on the first three bits, namely Genetics, Environment and Management. An initial study with Katahdin sheep shows how these elements work together. We based genetics on body weights, fecal egg counts, and FAMACHA scores recorded at around 90 days of age in over 3,500 Katahdin lambs from 17 flocks participating in the National Sheep Improvement Program (NSIP). FAMACHA scores…

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What is Sheep GEMS?

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Sheep GEMS News Brief 1 – April 2024 GEMS stands for Genetics, Environment, Management and Society, which are four pillars of our sheep industry. Why so? In the U.S., distinct breed-types are spread across climatically diverse regions and management systems. Breeding robust sheep that perform well under these conditions is therefore critical to the industry’s long-term sustainability. Currently, however, traits indicative of robustness and climatic resilience are largely absent in our genetic evaluation. Our ambition in Sheep GEMS is to remedy that shortfall. Sheep GEMS has been underway for about two years, with exciting results generated. For those findings to…

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The “Ram”bunctious Ram: A Discussion on Ram Behaviors

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As sheep producers, we all need two important things to get lambs on the ground: ewes and at least one ram, depending on the size of the ewe flock. The purchase of a quality ram can be quite an investment. Understanding proper management and handling of your ram is vital to keeping the producer and everyone on the farm safe, while ensuring the health and longevity of the ram. Here are some points to think about in your operation: Proper handling and raising of rams/ram lambs impacts ram aggression. Rams have a natural level of aggression which increases as they…

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NSIP Data Entry – Dead At Birth (DAB)

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Not all lambs make it all the way from conception to birth. On occasion we see a litter where some are full term healthy lambs, but there is also a mummy or a partially formed lamb. Deciding how to enter data in these cases can be confusing. But here are some guidelines to help you decide how to enter these lambs.  Keep in mind that the birth type of a lamb is used in adjustments for birth weight. A single lamb that weighs 10 pounds will end up with a lower birth weight EBV than a triplet lamb with a…

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Prepubic Tendon Rupture

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Pregnant ewes experience a tremendous strain on their abdominal muscles and tendons as their lambs grow, especially during the last few weeks of pregnancy. The abdominal muscles and tendons are attached to the ribcage, vertebrae and pelvis (grey lines in picture) with the muscles and tendons forming a hammock (pink) that supports the abdominal organs. As the lambs grow, this hammock stretches and gets thinner and is under more pressure. The prepubic tendon (red X in the picture) is made up of the tendons of multiple abdominal muscles and attaches along the lower rim of the pelvis, just above the…

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Orphan Lamb Considerations

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Sooner or later, nearly every shepherd has a lamb that needs to be supplemented. Whether it's a rejected lamb, one whose dam has died, or simply a lamb whose dam has insufficient milk, identifying these lambs early and getting them off to a good start is essential. Other lambs at special risk include twins out of yearling dams, triplets or quads, and lambs whose dams have or have had mastitis. Start by ensuring they receive adequate colostrum at birth and then supplement with a good quality milk replacer through weaning. It's best, when possible, for a lamb to be raised…

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