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Articles 31 - 60 of 399
Full-Text Articles in Animal Sciences
What Is The Best Energy Supplement For Thin Cows On Low-Quality Roughages?, David W. Sanson
What Is The Best Energy Supplement For Thin Cows On Low-Quality Roughages?, David W. Sanson
Range Beef Cow Symposium
Thin cows on low-quality roughages are the most challenging group of animals to deal with for beef cow producers in the Northern Great Plains. Typically, this situation occurs during the late fall/winter/early spring months, when the additional nutrient requirements for fetal development or lactation are needed. In this region, cows are often exposed to unfavorable weather conditions, which also increases nutrient requirement. Since thin cows have less outside fat, and therefore less insulation, they have to expend more nutrients to maintain body temperature than cows with adequate body condition. When these nutrient requirements are combined with the need to increase …
Simple Concepts For Long-Term Ranch Success, Patrick E. Reese
Simple Concepts For Long-Term Ranch Success, Patrick E. Reese
Range Beef Cow Symposium
In today’s fast-moving world of information, ranchers frequently suffer from technology overload. There can be enormous temptations to invest excessive amounts of resources on inconsequential activity. Understanding the responsibility of management for long-term success will help ranchers select appropriate technology. Focus on primary objectives will allow ranchers to develop simple and cost effective management strategies. Long-term survival of range livestock enterprises depends on (1) surviving or avoiding environmental extremes, (2) balancing livestock requirements with forage resources, and (3) recovering investments.
Achieving Cow/Calf Profitability Through Low-Cost Production, R. E. Taylor, T. G. Field
Achieving Cow/Calf Profitability Through Low-Cost Production, R. E. Taylor, T. G. Field
Range Beef Cow Symposium
A few years ago a NCA task force committee made the following statement:
"Low-cost producers (in all segments of the production chain) will survive in this system of competitive markets. Others [high-cost producers] will eventually be unable to compete and will exit the business."
Initially, this pointed summary statement fell on deaf ears as cattle prices were relatively good and many producers said they couldn't reduce costs as each year their costs were increasing. Currently, the high-cost producers are exiting the cattle business or depleting assets. Other cow/calf producers have positioned or are positioning themselves as low-cost producers. An increased …
A Rancher’S Focus On Cost Effective Management, Connie R. Quinn
A Rancher’S Focus On Cost Effective Management, Connie R. Quinn
Range Beef Cow Symposium
This paper focuses on profitability points which apply to the cow/calf producer. This is a challenging task and, at best, will be a restatement of the practices that are employed by any good beef producer. In today’s environment, if one has the boldness to put these points in print, it is only to reinforce the good management already being implemented and to offer ideas for other management practices that could also be employed. The merit of this exercise is to exchange ideas that can be mixed and matched with what is already being done on the ranch. The result will …
Cow-Share And Bull Leasing Arrangements – What’S Fair And Economical, Richard T. Clark, Donald B. Hudson
Cow-Share And Bull Leasing Arrangements – What’S Fair And Economical, Richard T. Clark, Donald B. Hudson
Range Beef Cow Symposium
Today's beef producer faces a difficult economic climate. Prices for calves, feeders and fed cattle are low compared to 2 years ago. Feed grain prices are soaring due to high demand and short supply. Access to borrowed capital could become limited for some. Cow-calf producers, especially, need to control costs and yet maintain productivity. Cash leasing of bulls and share-leasing of cows may offer ways to help control costs and acquire capital, if such arrangements are fair and offer all parties the opportunity to succeed.
A Review Of Ministerial Policy Guidelines For Rock Lobster Processing In Western Australia From The Working Group Appointed By The Minister For Fisheries And Chaired By Peter Rich, Peter Rich
Fisheries management papers
The rock lobster processing industry in Western Australia has a long history of management. Whilst management of the industry through the Fisheries Department has obviously been successful in helping to build the rock lobster industry into one of the State's major export industries, this approach is not without problems. With the introduction of the Fisheries Management Act 1994, the Minister for Fisheries deemed it appropriate to appoint an expert group to review the existing regulation of the rock lobster processing sector, draft the necessary guidelines to assist the Executive Director of the Fisheries Department make decisions on rock lobster processing …
Bulletin No. 34: Tidal Marshes Of Long Island Sound: Ecology, History And Restoration, Glenn D. Dreyer, William A. Niering
Bulletin No. 34: Tidal Marshes Of Long Island Sound: Ecology, History And Restoration, Glenn D. Dreyer, William A. Niering
Bulletins
No abstract provided.
Whooping Crane Sightings During July-December 1995 Migration, Steven Anschutz
Whooping Crane Sightings During July-December 1995 Migration, Steven Anschutz
Nebraska Bird Review
The first dates recorded for confirmed observations of migrating Whooping Cranes were July 13 in Canada and September 2 in the United States, and the last date was November 6 in Nebraska. Sightings were reported in Canada from Alberta (1) and Saskatchewan (34), and in the U.S. from North Dakota (4), South Dakota (1), Nebraska (4), Kansas (10), and Oklahoma (2). The weather during September and October was mild with minor disturbances on Sept. 20 and Oct. 23 causing snow over the Northern Great Plains. The first significant outbreak of cold air occurred during the week of November 5. Based …
Masthead From Nebraska Bird Review (December 1995) 63(4)
Masthead From Nebraska Bird Review (December 1995) 63(4)
Nebraska Bird Review
The Nebraska Bird Review is published quarterly in March, June, September, and December by the Nebraska Ornithologists Union, Inc., as its official journal, and is sent to members not b arrears for dues. Annual subscription rates (on a calendar-year basis only): $12.50 in the United States, $15.00 in Canada and Mexico, and $17.50 for all other countries, payable in advance. Single copies are $4.00 each, postpaid, in the United States, am $5.00 elsewhere. Send orders for back issues to Mary H. Pritchard, NOU Librarian, University of Nebraska State Museum, Lincoln, NI 68588-0514.
Nebraska Ornithologists' Union Fall Field Days, October 6-8, 1995, At The Nebraska National Forest Near Halsey
Nebraska Bird Review
Betty Grenon, Treasurer, reported that NOU has 240 members.
George Brown, Past President, reported on plans for the 1996 Annual Meeting to be held in Kearney, NE on May 17-19. Bill Huser, Vice President, announced that the 1997 Annual Meeting will be held jointly with The Iowa Ornithologists' Union and The South Dakota Ornithologists’ Union in South Sioux City, NE. in May (dates not set). There was some discussion about having a hospitality room to encourage mixing of the three groups. The 1996 Fall Field Days will be held at the Nebraska National Forest near Halsey on the first weekend …
Fall Field Report, August-November 1995, W. Ross Silcock
Fall Field Report, August-November 1995, W. Ross Silcock
Nebraska Bird Review
Generally this was a "normal" fall, if there is such a thing; a few new early and late dates but no pattern, a few notable species showing or absent, and a few rarities. Grebes and loons were in evidence, including Red-throated and Pacific Loons and Red-necked Grebe, but geese did not arrive (or were not reported) in great numbers by the end of the period. The less common herons were in good numbers, notably Snowy Egret, and also Little Blue Heron and Yellow-crowned Night-Heron. Notable for their absence were the thrushes; few Swainson's were found, and no Gray-cheeked, Veery, or …
A Possible Breeding Record For Clark's Nutcracker, Diana F. Tomback
A Possible Breeding Record For Clark's Nutcracker, Diana F. Tomback
Nebraska Bird Review
In the late morning of 17 May, 1987, my husband and I drove into Sowbelly Canyon, which is in the Pine Ridge area in northwestern Nebraska. In the canyon, about 3.3 miles from Harrison, we were in a ponderosa pine (Pinus ponderosa)–riparian community ecotone, and were startled to hear and see a flock of Clark's Nutcrackers (Nucifraga columbiana). About 30 adults were perched on branches or flying about the tops of the ponderosa pines. From the abundance of cones, it was clear that there had been a good seed crop the previous fall. Some of the …
Nebraska Bird Review (December 1995) 63(4), Whole Issue
Nebraska Bird Review (December 1995) 63(4), Whole Issue
Nebraska Bird Review
Table of Contents
Fall Field Report, August-November, 1995 ..............94
Observers for Fall Field Report ..............113
A Possible Breeding Record for Clark's Nutcracker in Northwestern Nebraska in 1987.............. 114
Whooping Crane Sightings, July-December, 1995 Migration ..............116
NOU Fall Field Days, 1995, Nebraska National Forest: Executive Committee Meeting ..............117
Table for NOU Fall Bird Count, October 7-8, 1995 ..............117
Index to Volume 63..............120
Morphometric, Isozyme And Random Amplified Polymorphic Dna (Rapd) : Analysis Of Sarotherodon Mossambicus Populations In Java, Indonesia, Yoedono Sovyanhadi
Morphometric, Isozyme And Random Amplified Polymorphic Dna (Rapd) : Analysis Of Sarotherodon Mossambicus Populations In Java, Indonesia, Yoedono Sovyanhadi
Loma Linda University Electronic Theses, Dissertations & Projects
The tilapia fish Sarotherodon mossambicus (Teleostei, Cichlidae) is an important protein source for Indonesians, is a strong competitor with some endemic species and .readily hybridizes with other tilapias. A base line assessment of the present genetic diversity of these populations in Indonesia was conducted to facilitate the management of this species. This study compared the effectiveness of the 3 techniques (morphometric, isozyme and RAPD) in revealing differences within and among 9 Javanese populations. The data were also used to estimate the rate of divergence among the populations.
Morphometric analysis showed significant size and shape differences among the populations. Isozyme and …
Lowfat Cheese Research Conference Proceedings, Various Authors
Lowfat Cheese Research Conference Proceedings, Various Authors
Other Documents
No abstract provided.
Tautog Hook And Release Mortality Data From Tag Retention Trials, Jon A. Lucy
Tautog Hook And Release Mortality Data From Tag Retention Trials, Jon A. Lucy
Reports
No abstract provided.
Comparison Of Predation Rates On Wild Turkey Hens Between Two Forest Ecosystems In Mississippi, Michael J. Chamberlain, Darren A. Miller, Bruce D. Leopold, George A. Hurst
Comparison Of Predation Rates On Wild Turkey Hens Between Two Forest Ecosystems In Mississippi, Michael J. Chamberlain, Darren A. Miller, Bruce D. Leopold, George A. Hurst
Wildlife Damage Management Conference
Because of increases in predator populations, concern has arisen about effects on wild turkey (Meleagris gallopavo) populations. We examined differences in predation of adult hens between 2 forested areas in Mississippi. Twin Oaks Wildlife Management Area (OAKS), located in the Mississippi Alluvial Valley, is a 2,302 ha tract of mature bottomland hardwood forest surrounded on 3 sides by soybean fields. Tallahala Wildlife Management Area (TWMA) is a 14,410 ha mixed forest in central Mississippi and is part of a large, forested ecosystem. Hens were captured, fitted with transmitters, and monitored by telemetry, 1990-1994 on TWMA (n = …
Kentucky Warbler (Vol. 71, No. 4), Kentucky Library Research Collections
Kentucky Warbler (Vol. 71, No. 4), Kentucky Library Research Collections
Kentucky Warbler
No abstract provided.
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter, Peter M. Grant
The Mayfly Newsletter
The Mayfly Newsletter is the official newsletter of the Permanent Committee of the International Conferences on Ephemeroptera.
Fishery Independent Standing Stock Surveys Of Oyster Populations In Virginia 1995, Roger L. Mann, James Wesson
Fishery Independent Standing Stock Surveys Of Oyster Populations In Virginia 1995, Roger L. Mann, James Wesson
Reports
Extensive description of the Virginia oyster resource and history of its utilization has been given by Haven, Hargis and Kendall (1981), and more recently reviewed by Hargis and Haven (1988). These contributions, among many others, describe a state of continuing decline. The James River, Virginia has served as the focal point for the Virginia oyster industry for over a century, being the source of the majority of seed oysters that were transplanted for grow-out to locations within the Virginia portion of the Chesapeake Bay and much further afield in the Middle Atlantic states (Haven et al, 1981 ). The Rappahannock …
Growth Of Testes And Testicular Morphology After Eight Generations Of Selection For Increased Predicted Weight Of Testes At 150 Days Of Age In Boars, R. R. Harder, D. D. Lunstra, R. K. Johnson, Roman L. Hruska
Growth Of Testes And Testicular Morphology After Eight Generations Of Selection For Increased Predicted Weight Of Testes At 150 Days Of Age In Boars, R. R. Harder, D. D. Lunstra, R. K. Johnson, Roman L. Hruska
Department of Animal Science: Faculty Publications
Weights of testes and epididymides, body weight, and morphometric measurements of testicular tissue of 75 boars of a line selected for eight generations for predicted weight of testes at 150 d of age and 75 boars of a randomly selected control line were used to evaluate the effects of selection on testicular development at 70, 100, 130, 160, and 450 d of age (n = 15 boars per line per age). Body weights for boars of the select and control line did not differ (P <.05) and the shape of the body growth curve was similar for both lines. Boars of the select line had larger testes than control boars at each age (P < .05), but there was a significant line x age interaction. The percentage increase of the select line mean over the control mean for weight of testes was 37% at 70 d, a maximum of 120% at 100 d, and 25% at 450 d. The percentage of the testes made up of seminiferous tubules differed between lines (P <.01). Lines had similar means of approximately 28% at 70 d and 71% at 450 d, but the mean for the select line was larger between 100 and 160 d of age; the greatest difference was 11.6% (control = 43.7, select = 55.3%) at 100 d. After 70 d of age, select-line boars had a greater percentage of seminiferous tubules with lumens that contained elongated spermatids (P <.lo). The proportion of the testes occupied by Leydig cells was greatest at 70 d, declined sharply between 70 and 130 d with a sharper decline in select-line boars, and then declined more gradually from 130 to 450 d of age. We conclude that selection for weight of testes at 150 d resulted in lower age at puberty for boars of the select line.
Growth Of Testes And Testicular Morphology After Eight Generations Of Selection For Increased Predicted Weight Of Testes At 150 Days Of Age In Boars, R. R. Harder, D. D. Lunstra, R. K. Johnson, Roman L. Hruska
Growth Of Testes And Testicular Morphology After Eight Generations Of Selection For Increased Predicted Weight Of Testes At 150 Days Of Age In Boars, R. R. Harder, D. D. Lunstra, R. K. Johnson, Roman L. Hruska
Department of Animal Science: Faculty Publications
Weights of testes and epididymides, body weight, and morphometric measurements of testicular tissue of 75 boars of a line selected for eight generations for predicted weight of testes at 150 d of age and 75 boars of a randomly selected control line were used to evaluate the effects of selection on testicular development at 70, 100, 130, 160, and 450 d of age (n = 15 boars per line per age). Body weights for boars of the select and control line did not differ (P <.05) and the shape of the body growth curve was similar for both lines. Boars of the select line had larger testes than control boars at each age (P < .05), but there was a significant line x age interaction. The percentage increase of the select line mean over the control mean for weight of testes was 37% at 70 d, a maximum of 120% at 100 d, and 25% at 450 d. The percentage of the testes made up of seminiferous tubules differed between lines (P <.01). Lines had similar means of approximately 28% at 70 d and 71% at 450 d, but the mean for the select line was larger between 100 and 160 d of age; the greatest difference was 11.6% (control = 43.7, select = 55.3%) at 100 d. After 70 d of age, select-line boars had a greater percentage of seminiferous tubules with lumens that contained elongated spermatids (P <.l0). The proportion of the testes occupied by Leydig cells was greatest at 70 d, declined sharply between 70 and 130 d with a sharper decline in select-line boars, and then declined more gradually from 130 to 450 d of age. We conclude that selection for weight of testes at 150 d resulted in lower age at puberty for boars of the select line.
Path To Extinction: Impact Of Vegetational Change On Lizard Populations On Arapaho Prairie In The Nebraska Sandhills, Royce E. Ballinger, Kristin S. Watts
Path To Extinction: Impact Of Vegetational Change On Lizard Populations On Arapaho Prairie In The Nebraska Sandhills, Royce E. Ballinger, Kristin S. Watts
Papers in Herpetology
Since removal of cattle from Arapaho Prairie in 1977, secondary succession has resulted in increased vegetation cover. Studies of resident lizards on a 150 × 150 meter grid revealed: (1) one lizard species (Holbrookia maculata) has essentially been eliminated in 15 years (from a maximum of 74 residents in 1979 to three residents in 1993); (2) a second lizard population (Sceloporus undulatus) has declined from 56 residents in 1979 to fewer than 30 residents in 1993; and (3) preferred microhabitats occupied by lizards have not changed, but their microgeographic distributions have shifted to areas of blowouts, …
A Late Quaternary Pollen Record From Cedarburg Bog, Wisconsin, Glen G. Fredlund, James R. Brozowski, Jong Woo Oh
A Late Quaternary Pollen Record From Cedarburg Bog, Wisconsin, Glen G. Fredlund, James R. Brozowski, Jong Woo Oh
Field Station Bulletins
Late Quaternary (from the last glaciation to present) forest history is inferred from the Cedarburg Bog fossil pollen record. Analysis of fossil pollen samples extend over 4 meters of continuous core recovered from near the center of the bog. The deepest and oldest of the fossil pollen assemblages (ca. 12,000 years ago) suggest open spruce woodlands unlike any in the contemporary boreal ecosystem. Pollen from the Pleistocene-Holocene transition (11,000 years ago) is marked by a number of abrupt changes in forest composition related to rapid climate change, species immigration, and progressive soils and ecosystem maturation. By 9,000 years ago most …
Life Cycle Patterns In Wisconsin Spiders, Joan P. Jass
Life Cycle Patterns In Wisconsin Spiders, Joan P. Jass
Field Station Bulletins
Five life cycle patterns in spiders are described and examples given. The most common pattern, maturation and mating in spring and early summer, is elaborated with a detailed description of the seasonal development of Philodromus cespitum. The four other patterns are exemplified by the following southeastern Wisconsin species: Argiope trifasciata--fall mating, Centromerus sylvaticus-- winter mating, Trochosa terricola--two mating seasons, and Pholcus phalangioides--year round mating.
Evaluation Of Animal Welfare By The Self-Expression Of An Anxiety State, M. P. Carey, J. P. Fry
Evaluation Of Animal Welfare By The Self-Expression Of An Anxiety State, M. P. Carey, J. P. Fry
Assessment of Animal Welfare Collection
Although mental well-being has long been accepted as an important aspect of animal welfare, the subjective feelings of farm or laboratory animals are regarded as lying beyond the scope of scientific enquiry. We now report that pharmacological conditioning of pigs with a drug, pentylenetetrazole, known to induce anxiety in man, permits investigation of the presence or absence of this psychological state during exposure to a variety of environmental stimuli encountered during normal husbandry. Such pharmacological conditioning therefore provides a valuable means to assess and improve elements of animal welfare and should be applicable to other species that show operant behaviour.
Evaluation Of Sea Scallop Dredge Ring Size : Contract Report Submitted To Noaa, National Marine Fisheries Service, William D. Dupaul, James E. Kirkley
Evaluation Of Sea Scallop Dredge Ring Size : Contract Report Submitted To Noaa, National Marine Fisheries Service, William D. Dupaul, James E. Kirkley
Reports
1. "A Report to the Sea Scallop Plan Development Team: Preliminary Assessment of a 3.25 Inch Hing Dredge" Virginia Marine Hesource Report No. 94-1 February, 1994 ........p 11
2. "Harvesting Efficiency and Size Selectivity of 3.25 and 3.50 Inch Ring Sea Scallop Dredges," Preliminary Cruise Report U.S. Department of State, Washington, D.C. September, 1994 .......p 25
3. "Harvest Efficiency and Size Selectivity of 3.0 and 3.25 Inch Sea Scallop Dredge Rings" Virginia Marine Resource Report No. 94-5 July, 1994 .......p 29
4. "Harvest Efficiency and Size Selectivity of 3.25 and 3.50 Inch Ring Sea Scallop Dredges" Final Cruise Heport U.S. …
The Distribution Of Rice Rats (Oryzomys Palustris) And Meadow Voles (Microtus Pennsylvanicus) In Tidal Marsh Communities On The Eastern Shore Of Virginia, Allison L. Sowell
The Distribution Of Rice Rats (Oryzomys Palustris) And Meadow Voles (Microtus Pennsylvanicus) In Tidal Marsh Communities On The Eastern Shore Of Virginia, Allison L. Sowell
Biological Sciences Theses & Dissertations
Two tidal marsh sites were selected for live trapping of small mammals on the Eastern Shore of Virginia. Trap grids were established at site and animals were trapped and tagged each month for one year. Habitat variables were measured at the peak of the growing season and again in late winter when vegetation was at its least luxuriant. ANOVA and multiple regressions were used to analyze the relationships between rice rats and meadow voles and associated variables related to habitat structure.
ANOVA revealed where rice rats and meadow voles differed in habitat preferences. Meadow voles were consistently captured in association …
Movement Patterns And Habitat Use Of The Copperhead Snake (Agkistrodon Contortrix) In Southeastern Virginia, Christopher Edwin Petersen
Movement Patterns And Habitat Use Of The Copperhead Snake (Agkistrodon Contortrix) In Southeastern Virginia, Christopher Edwin Petersen
Biological Sciences Theses & Dissertations
Radiotelemetry was used to study seasonal movement patterns, habitat use, and thermal relations of nine copperhead snakes, Agkistrodon contortrix, in southeastern Virginia from May 1993 to May 1995. Daily movements ranged from 0-450 m, with 0-5 m movements accounting for 65% of the observations. The seasonal movements of males were more extensive than those of females. Differences in seasonal movements between the sexes may be due to reproductive activity of the snakes. Both males and females significantly reduced their movements prior to shedding. More time was spent using upland deciduous forests than lowland river swamps or anthropogenic habitat. Copperheads …