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Collaborating To Study Science Teaching: A Case Study, Frank E. Crawley, Jon E. Pedersen

Department of Teaching, Learning, and Teacher Education: Faculty Publications

The purpose of this study was to form a science teacher and graduate-student researcher team in which its members engaged in a study of science teaching, and to examine the progress of the team's work through the creation of a case study. A graduate student and science teacher team was formed in one high school, and used collaborative action research methods to investigate students' learning in a general education biology course. As well, the action research project was used to examine the attempt of the research team (graduate student and teacher) to change instructional patterns in the teacher's classroom. Records …

2002 Beef Cattle Report

Nebraska Beef Cattle Reports

Nebraska 2002 Beef Cattle Report Table of Contents

Cow/Calf
Weaning Date for Spring Calving Cows Grazing Sandhills Range ● Replacement Heifer Development for Spring and Summer Calving Herds ● Urinary Allantoin as an Estimate of Microbial Protein Synthesis ● Metabolizable Protein Requirements of Lactating Two-Year-Old Cows ● Use of Sexed (Female) Sperm is Successful in Yearling Heifers 12 ● Estrous Synchronization Programs for Lactating Cows

Growing
Windrow Grazing and Baled-Hay Feeding Strategies for Wintering Calves ● Forage Quality and Animal Performance of Steers Grazing Smooth Bromegrass/Legume Pastures ● Supplementing Yearling Summer-Grazing Cattle with Fat and Protein and Subsequent Feedlot Performance …

Replacement Heifer Development For Spring And Summer Calving Herds, Gene H. Deutscher, Brent Plugge, Andy Applegarth, Rex Davis

Nebraska Beef Cattle Reports

A three-year study on heifer development of spring-born (n=240) and summer-born heifers (n=146) was conducted using sandhills ranch management. Spring-born heifers developed during the winter to reach 53% of mature weight at breeding had similar reproduction and calf production as heifers that reached 57% of mature weight. Feed costs were $22/heifer less for the lighter weight heifers. Summer-born heifers that were developed to reach 60% of mature weight at breeding in early fall had normal yearling pregnancy rates, but rebreeding rates of the 2-year-old cows were low, which caused high culling rates. Two-year-old cows calving in May produced greater calf …

A Simulated Economic Analysis Of Altering Days On Feed And Marketing Cattle On Specific Value-Based Pricing Grids, Dillon Feuz

Nebraska Beef Cattle Reports

Profit can be increased by feeding some pens of cattle additional days on feed and selling on a pricing grid that rewards quality. Discounts for Yield Grade 4 and heavy weight carcasses for as many as 10% to 15% of a pen may not exceed the premiums for higher grading carcasses and the benefit of selling additional weight on all cattle sold. While the grid price can be increased by feeding some pens of cattle fewer days and marketing on a yield grade rewarding grid, net returns are often decreased because of selling fewer total pounds.

Sorting Strategies In An Extensive Forage Utilization Beef Production System, James C. Macdonald, Terry J. Klopfenstein, Casey Macken, Jeffrey Folmer, Mark Blackford, D. J. Jordon

Nebraska Beef Cattle Reports

One hundred sixty crossbred steer calves were stratified by weight and allotted into four groups to test three sorting strategies against an unsorted control to compare methods of sorting long yearling steers to decrease variation in carcass weight and fat thickness, increase pounds of carcass weight sold, and increase profitability. Sorting by weight upon entry into the feedlot or by weight and fat thickness at the end of the feeding period increased average carcass weight. No statistical differences in variation or profitability were found, although numerical differences were present.

Gamma Sigma Delta, Nebraska Chapter Newsletter, Issue #24, February 2002

Gamma Sigma Delta, Nebraska Chapter: Newsletters

PRESIDENT'S MESSAGE

STUDENT RECOGNITION RECEPTION

INITIATION AND AWARDS BANQUET RECIPIENTS

IN MEMORIAM

2002·Schedule of Events

COMMITTEES, 2002

2002 Scholarship Recognition Reception

Response Of Lowland Rice Plants To Simulated Insect Defoliation In West Africa, I. O. Oyediran, E. A. Heinrichs

Department of Entomology: Faculty Publications

Field experiments were conducted to investigate the impact of simulated insect-caused defoliation on irrigated rice. Defoliation levels tested were 0% (control), 25% defoliation at 21 days after transplanting (dat), 25% defoliation at 41 dat, 25% defoliation at 21 and 42 dat, 50% defoliation at 21 dat, 50% defoliation at 42 dat, 75% defoliation at 21 dat, 75% defoliation at 42 dat, 75% defoliation at 21 and 42 dat, 100% defoliation at 21 dat, and 100% defoliation at 21 and 42 dat. Tiller height, total number of tillers, percent panicle-bearing tillers, weight of 100 grains, and grain yields were recorded. The …

The Graphic Syllabus: Shedding A Visual Light On Course Organization, Linda B. Nilson

To Improve the Academy: A Journal of Educational Development

Students rarely understand how a course is organized from the week-by-week topical listing in traditional syllabi. This chapter explains a teaching tool called a graphic syllabus, which elucidates (and may improve) course design/organization and increases student retention of the material. It may resemble a flow chart or diagram or be designed around a graphic metaphor with another object. Included here are materials, experiences, and graphic syllabi from a workshop conducted several times on how to compose one (involving about 115 faculty and faculty developers). Graphic representations of text-based material appeal to the visual learning preferences of today’s students and complement …

A Modified Microteaching Model: A Cross–Disciplinary Approach To Faculty Development, John P. Hertel, Barbara J. Millis, Robert K. Noyd

To Improve the Academy: A Journal of Educational Development

Three departments at the United States Air Force Academy successfully used a microteaching model to train new faculty. Like other models, its structured approach used videotaping and peer coaching. The model also contained several unique features, including a cross-disciplinary approach to supplement feedback from department members and focused small group feedback with built-in preparation time. Thus, this model results not only in enhanced teaching performance, but also in departmental and institutional collegiality.

Court Review: Volume 38, Issue 4 - Drug Treatment Programs: Policy Implications For The Judiciary, Arthur H. Garrison

Court Review: Journal of the American Judges Association

Drug use in the United States has been cited for the growth in American prisons over the past decade. Heroin, once considered a drug to be avoided and scorned, has had resurgence in use by middle-class youth and white-collar professionals due to the increased purity of the drug and the lack of need to use needles for ingestion. Naltrexone has been used as a method of helping heroin addicts to end their drug dependency, but such programs have limitations in their use and effectiveness. This paper is drawn from an evaluation of a drug treatment program in Wilmington, Delaware. The …

Gamma Sigma Delta, Nebraska Chapter Newsletter, Issue #24 [#25], August 2002

Gamma Sigma Delta, Nebraska Chapter: Newsletters

PRESIDENT'S MESSAGE - Marilynn Schnepf, President, Nebraska Chapter

Gamma Sigma Delta Scholarship Recognition Reception

HISTORIAN'S REPORT - DeLynn Hay, Historian

GAMMA SIGMA DELTA MEMBERSHIP REPORT (PRELIMINARY) - 2002 - David L. Keith, Membership Coordinator

NOMINATIONS FOR MEMBERSHIP TO GAMMA SIGMA DELTA August 2002

Merit Award Nomination

Teaching Award Nomination

Research Award Nomination

Extension Award Nomination

Mutagenic Stabilization And/Or Disruption Of A Cd4-Bound State Reveals Distinct Conformations Of The Human Immunodeficiency Virus Type 1 Gp120 Envelope Glycoprotein, Shi-Hua Xiang, Peter D. Kwong, Rishi Gupta, Carlo D. Rizzuto, David J. Casper, Richard Wyatt, Liping Wang, Wayne A. Hendrickson, Michael L. Doyle, Joseph Sodroski

Nebraska Center for Virology: Faculty Publications

The human immunodeficiency virus type 1 (HIV-1) gp120 exterior envelope glycoprotein is conformationally flexible. Upon binding to the host cell receptor CD4, gp120 assumes a conformation that is recognized by the second receptor, CCR5 and/or CXCR4, and by the CD4-induced (CD4i) antibodies. Guided by the X-ray crystal structure of a gp120-CD4-CD4i antibody complex, we introduced changes into gp120 that were designed to stabilize or disrupt this conformation. One mutant, 375 S/W, in which the tryptophan indole group is predicted to occupy the Phe 43 cavity in the gp120 interior, apparently favors a gp120 conformation closer to that of the CD4-bound …

Animal Science Alumni Newsletter, Winter 2002

Department of Animal Science: Departmental News

Contents:

From the Department Head’s Desk
Faculty Retirement
New Faculty
100 Years of 4-H in Nebraska
Feedlot Internship Program and Feedlot Extension Meetings
Japanese Agricultural Training Program
Graduate Program
Animal Science Student Ambassadors
Bud Britton Animal Science Golf Classic
Masters Week
Deaths
Emeriti/Retiree Reception
Emeriti Update
Block & Bridle Activities
Animal Science Graduate Association
Recent Department Awards and Recognitions
CASNR Alumni Board
Academic Quadrathlon
Judging Team Activities
Attention — Judging Team Alumni
Alumni News
Alumni Newsletter Wins Award
Your Newsletter Committee
Call for Information for the 2003 Issue of the Animal Science Alumni Newsletter
Animal Science Trivia
Calendar of Events …

Composition And Morphology Of The Follicular Basal Lamina During Atresia Of Bovine Antral Follicles, H. F. Irving-Rodgers, M. L. Mussard, J. E. Kinder, R. J. Rodgers

Department of Animal Science: Faculty Publications

The fate of the follicular basal lamina during atresia was investigated using bovine follicles, in which different follicle phenotypes have been observed. These phenotypes include: healthy follicles with rounded basal granulosa cells with an aligned basal lamina or follicles with columnar basal granulosa cells with a basal lamina of many loops (loopy), and atretic follicles in which either the antral granulosa cells (antral atresia) or the basal cells (basal atresia) die first. Loopy lamina and basal atresia occur only in small antral follicles < 5 mm in diameter. Follicles were collected from cattle of unknown reproductive history and processed for immunohistochemistry and electron microscopy, and from animals in which follicle growth had been monitored by daily measurements of follicle diameter by ultrasonography. Electron microscopic observations of dominant follicles during the growth phase, plateau and regression showed that the basal lamina was still visible and intact upon atresia. These follicles had a conventional aligned basal lamina, which they retained, except for some degree of folding, as they progressed into antral atresia. In small follicles (2–5 mm in diameter), the basal cell shape (rounded or columnar) and appearance of the basal lamina (aligned or of many loops) did not appear to be related to the type of atresia. On atresia the follicular basal laminae retained immunoreactive laminin α1 and β2, type IV collagen a1 and nidogen. Laminin α2, which may come from the theca, was present in the follicular basal lamina of only 22% of healthy follicles, but was expressed very commonly in 71% of the atretic follicles. Laminin α2 expression was found in both phenotypes of healthy follicles, antral and basal atretic follicles, and follicles with aligned or loopy basal laminae. It is concluded that the basal lamina is not degraded upon atresia, but does undergo a variety of other changes.

The Use Of X-Ray Computer Tomography For Measuring The Muscularity Of Live Sheep, H. E. Jones, R. M. Lewis, M. J. Young, B. T. Wolf

Department of Animal Science: Faculty Publications

Potential measures of muscularity derived from X-ray computer tomography (CT) were assessed using data for 160 sheep (50 Suffolk males, 50 Suffolk females, 40 Texel males and 20 Charollais males). One-fifth of the lambs within each breed and sex were slaughtered at each of 14,18 or 22 weeks ofage and two-fifths slaughtered at 26 weeks. All lambs were CT scanned prior to slaughter with longitudinal and cross-sectional scans taken at three positions along the body LSth lumbar vertebra (LV5), mid-shaft of the femur (FEM) and ischium USC)]. After slaughter, linear measurements of side length (SL) and M. longissimus thoracis et …

A Description Of The Growth Of Sheep And Its Genetic Analysis, R. M. Lewis, G. C. Emmans, G. Simm

Department of Animal Science: Faculty Publications

The Gompertz is one of a family of growth functions that, when the environment [eg.food, housing) is nonlimiting, provides a useful description of growth as a comparatively simple, single equation. It has three parameters of which the important ones are mature size, A, and the rate parameter, B. Estimates of A and B, however, are highly correlated and defining their separate values for individual animals is problematic. This problem was explored using five methods for estimating the parometers, or transformations ofthem, to describe the growth oftwo genotypes of Suffolk sheep kept under non-limiting conditions. 0 ne genotype was under selection …

Effects Of Breed And Family On Rate Of Copper Accretion In The Liver Of Purebred Charollais, Suffolk And Texel Lambs, N. F. Shuttle, R. M. Lewis, J. Small

Department of Animal Science: Faculty Publications

The feeding of housed lambs on conserved forages and pelleted rations is accompanied by a high risk of chronic cpper (Cu) poisoning (CCP) which might be reduced by seleting sires for low liver Cu status. Livers were therefore retrieved from Suffolk, Texel and Charollais lambs, slaughtered during the course of a performance trial, to ascertain sire and possibly breed effects on the rate of Cu accretion in the liver. In total, 160 livers were obtained, 100 from Suffolk, 40 from Texel and 20 from Charollais lambs, the progeny of 14, eight and eight sires, respectively. Lambs came from three separately …

Effects Of Index Selection On The Carcass Composition Of Sheep Given Either Ad Libitum Or Controlled Amounts Of Food, R. M. Lewis, G. C. Emmans, G. Simm

Department of Animal Science: Faculty Publications

Sheep of a line (S) selected on an index to increase lean weight and decrease fatness at an age, and a control line (C), were given a high quality food at different levels including ad libitum. Live performance was measured from about 21 to 114 kg live weight, The carcasses of each line were analysed for lean, fat and bone at three widely varying weights in both males and females. Level of feeding did not affect the extent to which S was superior to C in either the level of fatness in the carcass (0·86 as much) or the ratio …

Landscaping To Avoid Wildlife Conflicts

Other Bird Strike and Aviation Materials

Wild animals contribute to our enjoyment of nature, and many species add aesthetic value to urban and suburban environments. Landscapes are frequently developed to be “environmentally friendly” by providing food and cover for songbirds, waterfowl, squirrels, and other wildlife. Wild animals can, however, damage property or threaten human health and safety. The presence of undesirable species or animal overpopulation often leads to many common wildlife problems associated with urban landscapes. Equipped with the right information, landscape designers can significantly reduce the potential for wildlife–human conflicts and their resulting impacts on economic interests and public safety.

Ec02-1565 Biology And Management Of Potato Insects, Robert J. Wright, Gary L. Hein, W. Wyatt Hoback, Alexander D. Pavlista

University of Nebraska-Lincoln Extension: Historical Materials

A variety of insects can damage potatoes in Nebraska. Insects may feed directly on the tubers and damage the harvestable crop, or they may indirectly damage the crop by feeding on leaves or stems. If severe enough, indirect damage may reduce harvestable yield and quality. Insect feeding also may be important because some insects (e.g., aphids) may transmit plant diseases such as viruses when they feed, or others (e.g., psyllids) may inject toxins. This publication reviews the identification, biology, and management of common insect pests of potatoes in Nebraska. The basis for a successful integrated pest management (IPM) program for …

Effects Of Management Practices On Grassland Birds: Eastern Meadowlark, Scott D. Hull

United States Geological Survey: Effects of Management Practices on Grassland Birds

Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which …

Effects Of Management Practices On Grassland Birds: Wilson’S Phalarope, Jill A. Dechant, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Amy L. Zimmerman, Betty R. Euliss

United States Geological Survey: Effects of Management Practices on Grassland Birds

Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which …

Effects Of Management Practices On Grassland Birds: Savannah Sparrow, David A. Swanson

United States Geological Survey: Effects of Management Practices on Grassland Birds

Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which …

Effects Of Management Practices On Grassland Birds: Lesser Prairie-Chicken, Brent E. Jamison, Jill A. Dechant, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Betty R. Euliss

United States Geological Survey: Effects of Management Practices on Grassland Birds

Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the breeding distribution of Lesser Prairie-Chicken in the United States and southern Canada. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which provides the fundamental …

Effects Of Management Practices On Grassland Birds: Henslow’S Sparrow, James R. Herkert

United States Geological Survey: Effects of Management Practices on Grassland Birds

were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which provides the fundamental components or keys to management for the species. A section …

Endangered Species Bulletin, January/February 2002 - Vol. Xxvii No. 1

Endangered Species Bulletin

In this issue:
4 Endangered Species and the National Park Service
8 Endemic Amphipods in our Nation’s Capital
10 Endangered Species in Midwestern Parks
12 Alaska: A Great Life for Wildlife
14 Diverse Challenges in the Intermountain Region
16 Improving Prospects for the Florida Panther
18 Endangered Species in the Pacific and Western Parks
20 Restoring an Atlantic Barrier Island Epidemic
22 Turtle Patrol on Padre Island

Ec02-179 Managing Livestock Manure To Protect Environmental Quality, Michael A. Reynolds, Brian L. Benham, Richard B. Ferguson, Christopher G. Henry, Charles A. Shapiro, James P. Stack, Charles S. Wortmann

University of Nebraska-Lincoln Extension: Historical Materials

This book covers the land application part of manure management. With increasing regulations, the livestock producer needs to understand the scientific principles that affect manure transformations and how to use these principles to manage the manure for maximum fertilizer value with minimal environmental impact. Improved land application of manure is one part of the solution, but we suggest that the producer evaluate the quantity of nutrients arriving on the farm as feed, animals, and fertilizer compared to the total that is exported. Achieving a nutrient balance will reduce potential environmental hazards often associated with animal agriculture.

Ec02-171 Canada Thistle, Robert G. Wilson

University of Nebraska-Lincoln Extension: Historical Materials

Canada thistle [Cirsium arvense (L) Scop.] is one of the seven species defined by Nebraska law as a noxious weed. At least 35 other states also have determined by law that Canada thistle poses a threat to the economic, social, and aesthetic well-being of the residents of their state. Canada thistle is probably the most widespread of all the thistle species and many land managers consider it the most difficult thistle to control. In Nebraska, Canada thistle is estimated to infest 460,000 acres.

Ec02-174 Leafy Spurge, Robert A. Masters, Brady F. Kappler

University of Nebraska-Lincoln Extension: Historical Materials

Leafy spurge is an invasive weed that infests over three million acres in the northern Great Plains and the prairie provinces of Canada. It is commonly found in rangelands, pastures, roadsides, rights-of-way, and woodlands. Leafy spurge can reduce rangeland and pasture carrying capacity by as much as 75 percent because it competes with forages and cattle avoid grazing areas infested with this weed. In North Dakota where leafy spurge infests about 900,000 acres, estimates of direct and indirect losses exceed $100 million each year. In Nebraska, the direct loss in forage value attributed to leafy spurge has been estimated at …

Ec02-174 Noxious Weeds Of Nebraska: Leafy Spurge, Robert A. Masters, Brady Kappler

University of Nebraska-Lincoln Extension: Historical Materials

Leafy spurge is an invasive weed that infests over three million acres in the northern Great Plains and the prairie provinces of Canada. It is commonly found in rangelands, pastures, roadsides, rights-of-way, and woodlands. Leafy spurge can reduce rangeland and pasture carrying capacity by as much as 75 percent because it competes with forages and cattle avoid grazing areas infested with this weed.

This Extension Circular discusses the biology, identification, distribution and control of leafy spurge.