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Later Mating Improves Lambing Results, R J. Suiter

Journal of the Department of Agriculture, Western Australia, Series 4

Ovulation studies in Western Australia have indicated that increased lambing percentages in crossbred and Merino ewes could be expected from mating in February-April rather than December- January.

Such increases have been demonstrated in time of lambing trials with crossbred ewes, but had not been seen in Merino flocks until recently.

This report summarises the results of time of lambing trials with Merinos carried out at the Merredin and Wongan Hills Research Stations between 1963 and 1969.

Stem Canker Disease Of Red Flowering Gums, W P. Cass Smith

Journal of the Department of Agriculture, Western Australia, Series 4

Of the many native Eucalypts in Western Australia few are more attractive than the red flowering gum.

It flowers generally during the Christmas period and provides a beautiful display for several weeks, with blossoms of several colours including dark red, scarlet, orange and pink.

Growing Barley For Grain In Western Australia : Barley Quality, J A. Parish

Journal of the Department of Agriculture, Western Australia, Series 4

Plumpness and absence of pinched grain are desirable for both malting and feed barley.

This is a brief discussion of various Quality standards in barley and how they may not be met.

Look After The Tail Enders, B R. Beetson

Journal of the Department of Agriculture, Western Australia, Series 4

IN Department of Agriculture drought feeding trials last summer, shy feeders lost weight and died while the bigger sheep grew fat. When drafted off and fed separately the shy feeders ate their share and survived the summer.

Effects Of Phenylmercuric Acetate On The Transpiration And Physiology Of Quaking Aspen, Kenneth O. Higginbotham

Aspen Bibliography

No abstract provided.

Genetic Aspects Of Calving Ease, James S. Brinks

Department of Animal Science: Faculty Publications

Several trends in cattle production and marketing are becoming evident. Leaner and perhaps heavier muscled slaughter cattle will be in demand through the chain from consumers back through retailers, packers, feeders and finally the producers. Emphasis on growth in the feedlot will continue. Thus, the feedlot and carcass characteristics desired point towards fairly large, heavier muscled cattle. At the producer level, increased emphasis is being placed on matching cow size, milk level, and overall biological type to available resources. Thus, the trend for maternal herds in the Great Plains point towards an adapted, probably moderate size, and milking cow that …

Road-Kill Census Of Mammals In Northeastern Arkansas, J.W. Ed Wortham, Earl L. Hanebrink

Journal of the Arkansas Academy of Science

No abstract provided.

Evolutionary Trends Of Chiropteran Dentitions, Bob H. Slaughter

Fondren Science Series

The paleontologist's obsession with teeth may be a cause for wonder to the neo-mammalogist accustomed to utilizing knowledge of habits as well as the whole suite of physical characters when evaluating an animal. The occasional more-or-less complete fossil skeleton is most welcome, but more often only isolated skeletal elements are recovered. Teeth being constructed of relatively hard and resistant material are more readily preserved and usually reflect dietary habits and relationships better than other isolated elements. Horizontal classification faces a real possibility that two groups with a common ancestor have greatly diverged in their dietary habits and consequent tooth-pattern. The …

Zoogeography Of Bats, Karl F. Koopman

Fondren Science Series

The Order Chiroptera is the second largest order of mammals, with, according to my most recent revised figure, 846 species. Inasmuch as the group is world-wide, reaching many distant islands, and inasmuch as many species and higher groups are quite localized and some very distinctive, one might expect that a good deal of work on bat zoogeography would have been undertaken. However, such is not the case. Darlington (1957, pp. 320-410) does discuss the general geographical patterns of bats, and Tate (1946) gives a useful analysis of the bats of the Malay archipelago. However, many writers on zoogeography have given …

Echolocation And Communication In Bats, Edwin Gould

Fondren Science Series

Bat echolocation studies date back to 1793 when Lazaro Spallanzani investigated the effects of blinding and deafening bats. He blinded wild bats and several days after the operation found that they had survived and had insect-laden stomachs. The deafened bats, on the other hand, collided with obstacles in a darkened or lighted room (Dijkgraaf, 1960). Griffin & Galambos (1940, 1941 and 1942) as well as Dijkgraaf (1943, 1946) repeated some of Spallanzani's experiments. They concluded that bats emit high frequency sounds, the echos of which are used for obstacle avoidance. Two essential kinds of observations supported the echolocation hypothesis: bats …

Thermoregulation In Bats, Robert E. Henshaw

Fondren Science Series

Much controversy surrounds the ability of bats to thermoregulate, especially within the hibernating state. The general conception is that all bats become poikilothermic daily and also over-winter in deep hibernation. In fact, as much diversity exists in thermoregulatory patterns in the Order Chiroptera as exists in all of the rest of the mammals. Some species maintain their body temperature with a precision of + or - 1 ° C, whether active or asleep; while other species can remain in deep torpidity with the body temperature near 0°C for several months without arousal. The intent of the present paper is to …

Chiropteran Mortality, David D. Gillette, John D. Kimbrough

Fondren Science Series

The study of chiropteran mortality is a difficult one because observations concerning mass mortality, predation, and fatal accidents are sporadic and unexpected. Almost every known predaceous animal preys on bats from time to time; but (with one or two rare exceptions) do so only when an occasional opportunity presents itself, and do not specialize in bat predation. Our knowledge of bat pathology is meager. Mass-mortalities have been reported only from sight observations, and the causative organisms rarely ascertained, because of the unexpected encounter. The relationships between human and chiropteran diseases are becoming much better understood; this study is mostly oriented …

Bats: Carriers Of Human Disease-Producing Agents, Robert J. Baker

Fondren Science Series

For many years bats have been known to be harbingers of various agents which produce disease in man. Elsewhere in this volume certain parasites of bats are discussed including the association of these animals with Trypanosoma cruzi in South America and Texas (Ubelaker, 1970). Little is known concerning the association of bats with bacteria which cause disease in man. Four serotypes of Salmonella known to cause salmonellosis have been isolated from bats, one from bats collected in the Canal Zone (Klite & Kourany, 1965) and the other three from bats collected in southwestern Colombia, South America (Arata et al., 1968). …

Bat Conservation, Edwin Gould

Fondren Science Series

Since we know that some bat populations attain astronomical size, bat conservation may seem inconsequential. However, during the past 10 to 20 years, some bat-banders and other mammalogists have reported a decrease of bats in hibernating cave colonies. In general, summer colonies of most species of bats are dispersed; from these sites migrating bats converge on relatively few caves in which they hibernate. Some species are probably most vulnerable in at least the following four situations. 1. Hibernating bats that roost in caves or mines may be destroyed by teenagers or adults who have no concern for the bats. 2. …

Systematic Infections For The Assay Of Plant Viruses, Myron K. Brakke

Department of Plant Pathology: Faculty Publications

The first infectivity assays of plant viruses relied on the percentage of inoculated plants becoming systemically infected. The use of systemic infections for assays became unfashionable, however, after the discovery of local lesions and the demonstration that their numbers depended on virus concentration. Continued emphasis on local lesions over the years led to the widely held belief that systemic infections could not be used for a reliable and accurate assay of plant viruses. There was never any good statistical evidence for this viewpoint. In fact, no thorough investigation has been published of the accuracy of "systemic assays" of plant viruses, …

Aquatic Vascular Plant Communities Of Illinois, Benjamin Lee Dolbeare

Masters Theses

No abstract provided.

Studies On The Nutritional Aspects Of Tubificid Worms, Thomas Nelson Seng

Masters Theses

No abstract provided.

Pollination Mechanisms In Three Species Of Salvia Native To Southern California, Frank J. Visco, Brian Capon

Aliso: A Journal of Systematic and Floristic Botany

No abstract provided.

Louisiana Agriculture Magazine, Winter 1970-1971, Lsu Agricultural Experiment Station

Louisiana Agriculture

No abstract provided.

Relation Of Canopy Area And Volume To Production Of Three Woody Species, James M. Peek

Aspen Bibliography

No abstract provided.

Some Effects Of Prescribed Burning On Jack Pine Reproduction In Northeastern Minnesota, C.E. Ahlgren

Aspen Bibliography

Prescribed burning has been used for a number of years in the management of jack pine (Pinus Banksiana Lamb.) lands in the United States and Canada.

Natural Regeneration Of White Spruce Under Spruce-Aspen Shelterwood, B-18a Forest Section, Alberta, J. C. Lees

Aspen Bibliography

No abstract provided.

The Lipid Composition Of The Egg Shell Of The Tick Rhipicephalus Sanguineus, Anthony F. Molinari

Master's Theses

No abstract provided.

Some Ecological Relations Of Fairy Shrimps In Alkaline Habitats Of Nebraska, D. B. Mccarraher

Nebraska Game and Parks Commission: Staff Research Publications

Ecological studies on the distribution of fairy shrimps have been made from 246 sites in the sandhills region of Nebraska. New records for Nebraska have been established for Artemia salina, Branchinecta campestris, B. lindahli, B. mackini and Cyzicus mexicanus. Seasonal populations of shrimp have been located in habitats containing permanent fish populations. Water mineralization was the dominant environmental condition related to the distribution of phyllopods with sodium and potassium compounds predominating in the strongly alkaline lakes. Several of the Artemia lakes were classified as hydroxide sites. Many of the alkaline ponds, where B. lindahli and B. campestris flourish, are …

Skull Key To Adult Minnesota Mammals, Carl H. Ernst

Journal of the Minnesota Academy of Science

An artificial key to the skulls of adults of the mammals reported from Minnesota is presented for possible use not only by wildlife and professional biologists, but also by those lay persons interested in identifying skulls they might find in Minnesota.

Man And His Environment: The Ecological Limits Of Optimism, R. S. Miller, G. M. Woodwell, W. R. Burch, P. A. Jordan, R. L. Means

Yale School of the Environment Bulletin Series

No abstract provided.

Natural Variation In Susceptibility Of Pinus To Neodiprion Sawflies As A Basis For The Development Of A Breeding Scheme For Resistant Trees, Walter R. Henson, Louis C. O'Neil, Francois Mergen

Yale School of the Environment Bulletin Series

No abstract provided.

Proceedings Of The Arkansas Academy Of Science - Volume 24 1970, Academy Editors

Journal of the Arkansas Academy of Science

No abstract provided.

Additions To The Arkansas Flora, Edwin B. Smith

Journal of the Arkansas Academy of Science

No abstract provided.

Observation Of Flowering In Arundinaria Gigantea (Walt.) Chapm. In Arkansas, Daniel L. Marsh

Journal of the Arkansas Academy of Science

No abstract provided.