SAES-422 Multistate Research Activity Accomplishments Report

Sections

Status: Approved

Basic Information

Participants

Members of the WERA-039 Committee attending the business meeting were: Chair  Bob Stobart (University of Wyoming), Julie Walker (South Dakota State University), Christopher Schauer (North Dakota State University), Christopher Lupton (Texas A&M University), Tim Ross (New Mexico State University), Mike Salisbury (Angelo State University), Richard Battaglia (University of Idaho), Tumen Wuliji (University of Nevada-Reno), and Jim Thompson (Oregon State University). Access the following url for a complete list of members and complete contact information. http://lgu.umd.edu/lgu_v2/pages/part/viewpart.cfm

PLEASE SEE "MINUTES OF THE 2009 MEETING.DOC" , ATTACHED.
[Minutes]

Accomplishments

Summary of Accomplishments Objective 1: Develop ecologically and economically sound land management practices that use the unique harvesting abilities of sheep and goats for: a) managing and sustaining native plant communities; b) controlling invasive, exotic plant species; and c) improving nutrient cycling and pest management in range and cropping systems. A Montana State University study demonstrated that grazing sheep on winter and spring wheat stubble, and associated summer fallow, did not affect grain yield after 4 years when compared to chemical and mechanical summer fallow systems. A Texas study reported that ground redberry juniper leaves can effectively be used as a roughage source, replacing all of the cottonseed hulls in lamb feedlot rations containing 85% concentrate.

Objective 2: Develop sheep and goat management strategies that enhance the efficiency for production of high quality, marketable end products by: a) improving biological efficiency through better understanding of environmental and genetic events that influence meat and fiber production; b) identifying unique feedstuffs that enhance the nutritional value of meat; c) utilizing state-of-the-art instrumentation both in the field and in the lab to accurately and rapidly measure important characteristics of wool, mohair, and cash-mere; and d) develop animal identification systems that ensure the accurate real-time linking of animals to lifetime genetic, performance, health, and origin databases. A Texas study evaluated the crossbreeding of Texas Rambouillet ewes to Australian Merino rams to produce an F1 cross. As yearlings, the F1 cross produced the same amount of wool as their Rambouillet contemporaries. However, the F1 cross wool was finer, and in a range that had a significant effect on value. Additional research in Texas indicates that there was no difference in fertility and libido of Rambouillet, Suffolk, and hair-breed rams throughout the calendar year, suggesting that in Texas, out-of-season breeding programs should target the ewe, not the ram, for increasing breeding success. Another Texas study reported that scoring the guard hair length on newborn Rambouillet lambs appears to be an effective tool for selecting lamb that will have a longer staple length. Research at New Mexico State University indicated that progesterone deficiencies or tissue insensitivities to progesterone may contribute to pregnancy failures in ewes. A North Dakota State University trial indicated that lambs fed diets averaging 0.7% sulfur (through dried distillers grains plus solubles) did not develop polioencephalomalacia and maintained adequate performance, even when given no supplemental thiamin. This trial demonstrates that feeding elevated levels of distillers dried grains with solubles is possible in lamb finishing diets. The University of Wyoming integrated the GrowSafe Model 6000 individual feed intake monitoring system into the Whiteface Ram test. The GrowSafe Model 6000 has the technology to identify animals which are efficient convertors of feed to protein. Since feed efficiency is a trait that is moderate to highly heritable, identification of efficient rams could be used to improve genetic improvement which would lead to greater profitability of sheep production. The University of Nevada- Reno and the Edwin L. Wiegand Trust (Rafter 7 Ranch) continue to disseminate introduced Merino genetics into the western range sheep flocks. This is expected to improve wool quality and clip profits, and is also expected to strengthen a long-term competitive advantage for the western states wool sheep enterprises. Objective 3: Rapidly and accurately disseminate new information to the producer through: a) development of novel technology transfer platforms; b) hosting field days at research centers; and, c) organizing on-farm demonstration projects. The impact statement of the 2009 Utah Sheep and Goat Education Day indicated that over 200 producers received information on a variety of sheep/goat topics. Eighty six percent indicated the information they received would benefit them economically. The University of Nevada at Reno experimental results indicate that BioClip® is an effective technique to induce a simultaneous and complete fleece shedding in Merino or derived US wool sheep strains. Therefore, if BioClip® reagent can be licensed and made available, the system may serve as an alternative wool harvesting protocol to the traditional shearing for wool sheep enterprise. Research and Extension staff from the Universities of Colorado, Montana, North Dakota, South Dakota, Kansas, Wyoming, and the USDA-ARS presented new management information to over 150 small ruminant producers at the inaugural Mountain-Plains Sheep & Goat Conference in Greeley, CO. Both sheep and goat producers responded that they had an increase in knowledge and expertise through attending the program. The Mountain-Plains Sheep & Goat Conference provided a new venue for small ruminant scientists, industry, and producers to exchange novel information regarding the management of small ruminants.

Impacts

  1. Sheep grazing is a viable alternative to chemical and mechanical methods of weed control on summer fallow in dry land wheat production systems. Using sheep to control weeds on summer fallow will reduce pesticide and fossil fuel costs. Incorporating sheep into farming systems will result in higher levels of soil organic matter. Grazing sheep as a means of weed control on summer fallow may result in a lower cost of production for grain farmers. (Montana State University)
  2. In Texas, there are currently over 245,000 market lambs and over 1 million goats. If the technology is developed to efficiently harvest juniper, then this abundant resource will probably will be utilized by livestock producers as a "cheaper" feed that will increase animal health and reduce juniper encroachment. There is potential in Texas alone, for sheep and goats to consume over 9,000,000 lbs. of juniper per year. This amount is not including juniper that can be used in supplemental feeds. Potential to reduce landowners costs (approximately $100/acre) associated with managing juniper infestations, if there is a value in the harvested product. Also potential for landowners to grind juniper on-site ad either mix it themselves or sell the feed to a local feedmill (TAMU).
  3. A selection strategy being investigated has the potential to increase wool production of Rambouillet ewes by 25 % and reduce average fineness by 2 microns without additional inputs. In the current market (4-28-09), this would translate to tripling income from wool, from approximately $12 to $36/ewe. The greater challenge and objective of this research is to achieve this substantial increase in wool value without loss in lamb production. (TAMU)
  4. Current research with progesterone therapy has not decreased embryonic mortality. However, our crossbreeding (Suffolk X western white face) has increased lamb weaning weight by 10 % above the straightbred western white face lambs. (New Mexico State University)
  5. Ram breed is not a cause of seasonality in sheep reproductive performance, therefore, concern with reproductive activity in the male should not be of concern when choosing a ram breed to use in a production operation. Allows for more breed choices when choosing a ram breed for siring lambs during any season of the year, and by eliminating the concern of the male, a producer can concentrate efforts on managing for less seasonality in the female. (Angelo State University)
  6. Using hair presence at birth and weaning allows for more accurate selection for long wool production in Rambouillet lambs. Producers will be able to use indicators at weaning to aid in fiber selection rather than requiring extensive time on feed before being able to select for increased fiber production. This should, in turn, save a Rambouillet producer money by eliminating long term feeding. (Angelo State University)
  7. Lambs fed diets averaging 0.7% sulfur did not develop polioencephalomalacia while maintaining adequate performance, even when given no supplemental thiamin. Currently, dried distillers grain is 5-10% cheaper than corn on an energy basis. Maximizing the use of DDG will decrease ration costs when corn is removed from the ration and replaced with DDG at levels up to 60% of the ration. While supplemental thiamin may be provided as a safety net for preventing polioencephalomalacia, current research suggests this is not always required. (North Dakota State University)
  8. Feed costs are the single largest expense in sheep operations. Improving feed efficiency of animals will help to decrease feed expenses and increase net returns. All sheep producers would benefit from this information. New technology has provided the means of determining feed intake of rams on a central ram test allowing for the determination of Residual Feed Intake, a value which then can be used as a selection tool. (University of Wyoming)
  9. Application of the OFDA 2000 (Optical Fiber Diameter Analyzer) fleece measurements improves wool sheep selection efficiency, breeding value estimates, and wool clip profits. The application of OFDA 2000 measurements for individual fleece testing and sheep selection in the last five years has significantly improved the profitability of the Rafter 7 Ranch operations by identifying elite breeding animals and selling higher premium priced wool clips. University of Nevada - Reno)
  10. Nearly 1,600 sheep and goat producers from throughout the Intermountain West have received production-oriented education to increase their husbandry skills and improve the economic and environmental viability of their respective operations. 86% of 2009 workshop participants indicated the information gained from the event would benefit them economically. The Utah Sheep and Goat Education Days have provided a setting for small flock producers to network and exchange ideas amongst themselves. (Utah State University)
  11. Preliminary assessment of a biological wool harvesting system-BioClip® for shearing the US wool sheep flocks suggests that it will be very useful. Shearing is a labor intensive, accident and injury prone skill that normally improves with experience but is typically only a seasonal operation. Most of the 7 million sheep in the US inventory, whether wool producing Merino derived or dual purpose flocks or meat breeds, require shearing. Therefore, a biological wool harvesting procedure, such as BioClip® Wool Harvesting System, may offer more humane, less stressful, less contamination, and more environmentally friendly wool harvesting solution. (University of Nevada-Reno)
  12. Over 150 producers were in attendance for the 1st annual Mountain-Plains Sheep & Goat Conference to learn about new techniques in nutrition, reproductive management, grazing management, and disease management in sheep and goats. Both sheep and goat producers responded that they had an increase in knowledge and expertise through attending the program. The Mountain-Plains Sheep & Goat Conference provided a new venue for small ruminant scientists, industry, and producers to exchange novel information regarding the management of small ruminants. (Hettinger Research Center - North Dakota State University)

Publications

Montana PEER REVIEWED Dafoe, J. M., R. W. Kott, B. F. Sowell, J. G. Berardinelli, K. C. Davis and P. G. Hatfield. 2008. Effects of supplemental safflower and vitamin E during late gestation on lamb growth, serum metabolites, and thermogenesis J Anim Sci 2008 86: 3194-3202 PROCEEDINGS Redden, R.R., R. W. Kott, L.M.M. Surber, J. A. Boles, A. W. Layton, and P. G. Hatfield. 2008. Feedlot performance of lambs from different backgrounding systems. Proc. West. Sec. Amer. Soc. Anim. Sci. 59: 95-98. Redden, R. R., R. W. Kott, J. A. Boles, A. W. Layton, and P. G. Hatfield. 2008. Effects of Vit E, Zinc, By-pass protein, and Chlortetracycline to ewes of different age and body condition on lamb production and immune function. Proc. West. Sec. Amer. Soc. Anim. Sci. 59: 336-338. Redden, R. R., R. W. Kott, L.M.M. Surber, J. A. Boles, A. W. Layton, and P. G. Hatfield. 2008. Feedlot performance of lambs from different backgrounding systems. Montana State Univ. Rum. Nutr. Conf. New Mexico Meza-Herra, C.A., T.T. Ross, D.M. Hallford, D.E. Hawkins and A. Gonzalez-Bulnes. 2009. High periconception protein intake modifies uterine and embryonic relationships increasing early pregnancy losses and embro growth retardation in sheep. Reproduction of Domestic Animals. (Online) Hill, L. J., T. T. Ross, R. F. Taylor, R. A. Halalsheh, and D. T. Yates. 2008. Histological examinations of major organs from sprague-dawley female rats fed ruminaly digested snakeweed and undigested snakeweed. Proceedings, Western Sec, American Society of Anim. Sci. 59: 269-272. Yates, D. T., T. T. Ross, D. M. Hallford, L. J. Hill, and R. L. Wesley. 2008. Comparison of salivary and serum cortisol concentration in response to ACTH challenge in sheep. Proceedings, Western Sec, American Society of Anim. Sci. 59: 261-264. North Dakota PEER REVIEWED Schauer, C.S., M.M. Stamm, T.D. Maddock, and P.B. Berg. 2008. Feeding 60% of lamb finishing rations as dried distillers grains results in acceptable performance and carcass quality. Sheep & Goat Res. J. 23:15-19. ABSTRACTS AND PROCEEDINGS Neville, B.W., C.S. Schauer, L.A. Kirschten, K. Karges, M.L. Gibson, and G.P. Lardy. 2009. Influence of thiamin supplementation on feedlot performance, carcass quality, and incidence of polioencephalomalacia in lambs fed a 60% distillers dried grains plus solubles finishing ration. J. Anim. Sci. Proc. 60:In Press. C.S. Schauer, and J.S. Luther. 2009. Nutritional strategies for increasing the efficiency of sheep production. Proceedings of U.S. Sheep Research Programs. p. 27-28. Schauer, C.S., M.M. Stamm, T. Maddock, and P.B. Berg. 2008. 60% dried distillers rains in lamb rations results in acceptable performance and carcass quality. J. Anim. Sci. Proc. 59:396-399. Neville, B.W., C.S. Schauer, L.A. Kirschten, K. Karges, M.L. Gibson, and G.P. Lardy. 2009. Influence of dietary thiamin supplementation on ruminal pH and hydrogen sulfide gas concentration in lambs fed a ration containing 60% distillers dried grains with solubles. J. Anim. Sci. 87(Suppl. 2):#293. Luther, J.S., E.J. Windorski, C.S. Schauer, J.D. Kirsch, K.A. Vonnahme, L.P. Reynolds. J.S. Caton, and G. Wu. 2008. Impacts of L-Arginine on Ovarian Function and Reproductive Performance in Ewes. 86(E Suppl. 2):#LB5. ANNUAL REPORTS Becker, W., R. Schmidt, J. Luther, and C. Schauer. 2009. NDSU Extension Service Live Lamb Carcass Contest Report. 2009 NDSU Sheep Research Report. 50:3-4. Neville, B.W., C.S. Schauer, M.M. Thompson, P.B. Berg, and G.P. Lardy. 2009. Influence of Thiamin Supplementation on Feedlot Performance and Carcass Quality of Lambs Fed a 60% Distillers Dried Grain plus Solubles Finishing Ration. 2009 NDSU Sheep Research Report. 50:5-10. Luther, J.S., W.J. Windorski, J.S. Caton, G. Wu., J.D. Kirsch, K.A. Vonnahme, L.P. Reynolds, and C.S. Schauer. 2009. Effects of arginine supplementation on reproductive performance in Rambouillet ewes. 2009 NDSU Sheep Research Report. 50:11-13. Schauer, C.S., M.M. Stamm, P.B. Berg, D.M. Stecher, D. Pearson, and D. Drolc. 2008. Feeding of 60% Dried Distillers Grains in Finishing Rations Results in Acceptable Lamb Performance and Carcass Quality. 2008 NDSU Sheep Research Report. 49:3-6. Veil, S., and C.S. Schauer. 2008. Response of North Dakota Lamb and Wool Producer Association members to the National Animal Identification System Strategic Plan (NAIS). 2008 NDSU Sheep Research Report. 49:7-12. Texas PEER REVIEWED, REFEREED JOURNAL ARTICLES Lupton, C. J. 2008. Impacts of animal science research on United States sheep production and predictions for the future. J. Anim. Sci. 86:3252-3274. Waldron, D. F., C. A. Taylor, Jr., J. W. Walker, E. S. Campbell, C. J. Lupton, T. D. Willingham, nd S. Y. Landau. 2009. Heritability of juniper consumption in goats. J. Anim. Sci. 87:491-495. Lupton, C. J., E. S. Campbell, B. S. Engdahl, T. D. Lovett, F. A. Pfeiffer, C. A. Taylor, Jr., D. F. Waldron, and J. W. Walker. 2008. Selecting Angora goats to consume more juniper. Tropical and Subtropical Agroecosystems J. In press. Whitney, T. R. and B. E. Olson. 2009. Rumen microbial activity of sheep and cattle: ambient and conditioned. Livest. Prod. Sci. SUBMITTED Whitney, T. R. and D. F. Waldron. 2009. Evaluating nutritional status of Dorper and Rambouillet ewes in a range sheep production system. Sheep and Goat Res. J. ACCEPTED Woolley, D.K., B.J. May and M.W. Salisbury. 2007. Effect of protein level on feedlot performance and carcass characteristics of Texas Rambouillet feeder lambs. Texas Journal of Agriculture and Natural Resource. (Submitted) Kiker, W.A., M.W. Salisbury, B. Green and G.R. Engdahl. 2007. Effects of protein and energy feeding on ovine oocyte production and developmental capacity. TX. Jour. Ag. Nat Res. 20:52-62. Salisbury, M.W., B.J. May, S.J. Talley, M.A. Carr and G.R. Engdahl. 2007. Feedlot performance and carcass characteristics of feeder lambs implanted and re-implanted with zeronol. TX. Jour. Ag. Nat Res. 20:1-9. Sluiter, R.S., B.J. May, M.W. Salisbury, C.B. Scott, G.R. Engdahl and B.F. Craddock. 2007. Feedlot Performance and Carcass Traits of Texas Rambouillet Feeder Lambs Implanted with Growth Implants. TX. Jour. Ag. Nat Res. 20:22-27. Mendoza, N. Jr, B.J. May, M.W. Salisbury and G.R. Engdahl. 2007. The Effect of Protein Level on Feedlot Performance and Carcass Characteristics of Texas Rambouillet Ewes. TX. Jour. Ag. Nat Res. 20:75-81. ABSTRACTS Lupton, C. J. 2008. Impacts of animal science research on U.S. sheep production and predictions for the future. Amer. Soc. Anim. Sci. Centennial Mtg. Indianapolis, IN. July 7-11. J. Anim. Sci. 86, E-Suppl.2:394. Pfeiffer, F. A., C. J. Lupton, and D. F. Waldron. 2008. Estimating average fiber diameter and variability of wool fleeces using Optical Fibre Diameter Analysers (OFDA 100 and 2000). J. Anim. Sci. 86, E-Suppl. 2:495. Lupton, C.J., E. S. Campbell, B. S. Engdahl, T. D. Lovett, F. A. Pfeiffer, C. A. Taylor, Jr., D. F. Waldron, and J. W. Walker. 2008. Selecting Angora goats to consume more juniper. Proc. 9th Int. Conf on Goats, Queretaro, Mexico, August 31  September 5. Abstract 67:95-96. PROCEEDINGS AND ABSTRACTS Lupton, C. J. 2009. Wool research to enhance the competitiveness and prosperity of the U.S. sheep industry. Proc. U.S. Sheep Research Programs, Research Symposium, American Sheep Industry Association Annual Convention, San Diego, January 22:64-67. Settle, C.E., M.W. Salisbury, G.R. Engdahl and B.J. May. 2008. Using Kelp Seaweed to Control Heat Related Infertility in Rambouillet and Suffolk Rams. Western Extension, Research, and Academic Coordinating Committee 039 Proceedings. Chico Hot Springs, Montana: 38. Yates, D.T., M.W. Salisbury and H. Anderson. 2007. Effects of supplementation of tasco-ex on infertility in young male goats experiencing heat stress. J. Anim. Sci. 85:171, Supplement 2. Dunbar, N.A., B.J. May, M.W. Salisbury, C.B. Scott and M.T. Schafer. 2007. Effect of copper supplementation on artificial insemination conception rate of Angus cows and feedlot performance of Angus bulls. J. Anim. Sci. 85:173, Supplement 2. Mendoza, N., B.J. May, M.W. Salisbury, G.R. Engdahl, and G.G. Hilton. 2007. The effect of protein level on feedlot performance and carcass characteristics of Texas Rambouillet ewes. J. Anim. Sci. 85:173, Supplement 2. Self, J.M., M.W. Salisbury, B.J. May, G.E. Engdahl, C.B. Scott and R. Horst. 2006. Vitamin D Supplementation in Fall Born Rambouillet Lambs Raised on Small Grain Pastures. J. Animal Sci Proceeding, Western Section. Sato, N.E.A., M.W. Salisbury, C.B. Scott, and G.R. Engdahl. 2006. Effect of Solanum dimidiatum on embryonic loss and neonatal lamb survival in Rambouillet sheep. Western Extension, Research, and Academic Coordinating Committee 039 Proceedings. San Angelo, Texas. Owens, C.J., C.B. Scott, M.W. Salisbury and C.A. Taylor, Jr. 2008. Juniper consumption does not cause abortions or reduce neonatal viability in Boer-cross goats. Abstr. Soc. Range Management. 61:1273. George, C., C.B. Scott, C.A. Taylor, Jr., C.J. Owens, M.W. Salisbury, and B.J. May. 2008. Effects of Protein supplementation on juniper consumption by goats. Abstr. Soc. For Range Management. 61:1898. Owens, C.J., C.B. Scott, M.W. Salisbury and C.A. Taylor, Jr. 2008. Juniper consumption does not cause abortions or reduce neonatal viability in Boer-cross goats. Abstr. Tex. Sec. Soc. Range Management. George, C., C.B. Scott, C.A. Taylor, Jr., C.J. Owens, M.W. Salisbury, and B.J. May. 2008. Effects of Protein supplementation on juniper consumption by goats. Abstr. Tex. Sec. Soc. Range Management. Yates, D.T., M.W. Salisbury and H. Anderson. 2007. Effects of supplementation of tasco-ex on infertility in young male goats experiencing heat stress. J. Anim. Sci. 85:171, Supplement 2. Dunbar, N.A., B.J. May, M.W. Salisbury, C.B. Scott and M.T. Schafer. 2007. Effect of copper supplementation on artificial insemination conception rate of Angus cows and feedlot performance of Angus bulls. J. Anim. Sci. 85:173, Supplement 2. Mendoza, N., B.J. May, M.W. Salisbury, G.R. Engdahl, and G.G. Hilton. 2007. The effect of protein level on feedlot performance and carcass characteristics of Texas Rambouillet ewes. J. Anim. Sci. 85:173, Supp 2. Owens, C.J., C.B. Scott, M.W. Salisbury, and C.A. Taylor, Jr. 2007. Does juniper consumption by pregnant goats cause reproductive failure and/or reduction in neonatal viability. WERA 039. Corvallis, Oregon. Owens, C.J., C.B. Scott, M.W. Salisbury, and C.A. Taylor, Jr. 2007. Juniper consumption does not cause abortions or reduce neonatal viability in Boer-cross goats. Abstr. Soc. Range Manage. (Accepted). Owens, C.J., C.B. Scott, M.W. Salisbury, and C.A. Taylor, Jr. 2007. Juniper consumption does not cause abortions or reduce neonatal viability in Boer-cross goats. Tex. Sec. Soc. Range Manage. Sato, N.E.A., M.W. Salisbury, C.B. Scott, C.J. Owens, and G.R. Engdahl. 2007. Potato weed (Solanum dimidiatum) ingestion does not cause embryonic loss or affect neonatal lamb survival. Abstr. Soc. Range Manage, #381, Reno, NV. Self, J.M., M.W. Salisbury, B.J. May, G.E. Engdahl, C.B. Scott and R. Horst. 2006. Vitamin D Supplementation in Fall Born Rambouillet Lambs Raised on Small Grain Pastures. J. Animal Sci Proceeding, Western Section. Sato, N.E.A., M.W. Salisbury, C.B. Scott, and G.R. Engdahl. 2006. Effect of Solanum dimidiatum on embryonic loss and neonatal lamb survival in Rambouillet sheep. Western Extension, Research, and Academic Coordinating Committee 039 Proceedings. San Angelo, Texas. STATION REPORTS Waldron, D. F. and C. J. Lupton. 2008. Improvement of sheep through selection of performance-tested and progeny-tested breeding animals. Texas Agric. Exp. Sta. Res. Cen. Tech. Rep. 2007-1. Waldron, D. F. and C. J. Lupton. 2008. Angora goat performance test report. Texas Agric. Exp. Sta. Res. Cen. Tech. Rep. 2007-3. Waldron, D. F. and C. J. Lupton. 2009. Improvement of sheep through selection of performance-tested and progeny-tested breeding animals. Texas AgriLife Res. Cen. Tech. Rep. 2008-1. INVITED PRESENTATIONS Salisbury, M.W. 2008. Internal Parasites: Control in Small Ruminants. West Texas Youth Veterinary Science Workshop. San Angelo, Texas. Salisbury, M.W. 2007. Nutritional management of meat goats. Mountain States Meat Goat Association Field Day. Fort Collins, Colorado. Self, R.T., D.F. Waldron, M.W. Salisbury. 2007. Changes in performance of traits measured in performance tests on Rambouillet rams. Annual Performance Test Field Day, Sonora, Texas. Copeland, J.R., M.W. Salisbury. 2007. Internal Parasite Management in Small Ruminants. West Texas Vet Science Workshop. San Angelo, Texas. Salisbury, M.W. 2007. Livestock Handling Practices and Management Techniques. West Texas Vet Science Workshop. San Angelo, Texas. Salisbury, M.W. 2006. Meat Goat Production Strategies for Profit Minded Producers. Missouri Goat Producers Symposium. Web-Cast to Four Locations Salisbury, M.W. 2006. Internal Parasites: Why are they a problem in Small Ruminants. West Texas Youth Veterinary Science Workshop. Sonora, Texas. Salisbury, M.W., J.R. Copeland, D.F. Waldron, F.Craddock. 2006. Dorper vs. Rambouillet-Parasite Resistance. 33rd Annual Sheep and Goat Field Day. San Angelo, Texas. University of Nevada, Reno T. Wuliji, H. Glimp, T. Filbin. 2009. Two seasonal lambing in spring and fall increases reproductive efficiency of range sheep flock. J.A.S. Vol 87 Suppl.1 In Press. ADSA-CSAS-ASAS Annual Meeting (July 12-16, Montreal, Quebec, Canada). T. Wuliji, H Glimp, T. Filbin. 2009. Introduction of Merino genetics to improve Western range sheep flock wool quality and wool clip profits. Proceedings of US Sheep Research Programs. 47-49. American Sheep Industry Association Convention (January 21-24, 2009), San Diego, Ca. T. Wuliji, H Glimp, B Perryman, W. Rauw and T. Filbin. 2008. Sheep production on high desert rangelands and irrigated pasture. Proc. XXI Inter. Grassland Congress & VII Inter. Rangeland Congress: Multifunctional Grasslands In a Changing World. Vol. II. p. 83. Wyoming Cameron, B. A. and R.H. Stobart. 2008. Yellowing propensity of Rambouillet sheep. Sheep and Goat Res. J. 23:11. Alexander, B. M., R.H. Stobart, G.E. Moss. 2008. Scrapie Resistance and Production Traits in Rambouillet Rams: Ram Performance Test 2002  2006. Research in Veterinary Science .
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