Life Sciences Commons^™

Measurement Of Throughfall At Two Levels In A Young Aspen Stand, J.R. Clements

Aspen Bibliography

The purpose of this report is to compare measurements of the quantity of throughfall at two different heights above ground level in a seven-year-old sucker stand of largetooth aspen (Populus grandidentata Michx.) This comparison defines the influence rain splash from the forest floor has on the quantity of throughfall catch of trough rain gauges placed on the forest floor.

Net Rainfall In A Multi-Storied Aspen Forest Community, J.R. Clements

Aspen Bibliography

This paper presents mathematical equations describing the relationships between the amount of net rain per storm under each crown canopy and the amount of gross rain per storm in a multi-storied forest community. The relationships were curvilinear and accounted for gradual filling of the storage capacity of the vegetation. The rate of increase of net rainfall was successively less for each crown canopy in turn starting with the uppermost canopy in the forest. The equation coefficients varied in respect of the position of the crown canopies in the vegetal profile and also in respect of variations in vegetal structure within …

Problems Of Fertility Measurement, Y. Lal Arora

Journal of the Minnesota Academy of Science

ABSTRACT - All changes in annual fertility rates should not be taken as changes in completed fertility level, as some of the changes in annual rates may be due to the changes in the structures of the population. Annual rates may be affected by intrinsic limitations as well as by limitations due to incomplete coverage and inaccuracy of the relevant data. Problems leading to systematic errors in fertility rates are discussed in some detail.

The Cytogenetics Of The Salivary Gland Chromosomes Of Three Wild Type Strains Of Drosophila Melanogaster, Rosemary Ann Harris

Masters Theses

This investigation involves the cytogenetics of three strains of field-collected, wild-type Illinois Drosophila melanogaster. These three strains were collected from Charleston, Channahon, and Olney, Illinois, in 1967.

The purpose of this study was to compare cytogenetically these three strains and to determine if there exists differences among them. First, the chromosomes themselves were studied for the purpose of identifying the four chromosomes of D. melanogaster by their characteristic banding patterns. Then, the chromosomes of the three strains were examined for chromosomal aberrations, principally inversions. The cytogenetics of the chromosomes of the three strains were then compared and contrasted.

Photographs …

Molecular Weight Determinations Of Some Salmonella Potsdam Bacteriophage Dna's, Winston H. Richards

Loma Linda University Electronic Theses, Dissertations & Projects

Two group A phages, P9c/2 and P4/2, were studied. Their density, sedimentation velocity, and biochemical properties were compared. Their densities were determined by density gradient centrifugation in 38.3% cesium chloride. Sedimentation velocity was used to determine their molecular weights. To accomplish this, the DNA of P9c/2 and P4/2 was labeled with tritium and T₂ DNA, labeled with ³²P, was used as a standard. The DNA of P9c/2 and P4/2 was separately mixed with T₂ DNA and centrifuged in a 0-15% sucrose gradient. The molecular weights were calculated using the formula D₂/D₁= (M_{2 …}

Prime Lamb Production In Western Australia : A Review Of The Development Of The Prime Lamb Industry In Western Australia, R J. Suiter

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

PRIME LAMB production in Western Australia has evolved into an industry based almost entirely on the local market.

This has not always been the case. In the 1930-40 era a substantial proportion of the State's prime lamb production was exported to the United Kingdom.

During this era the industry was equally dependent on exports and local market.

Thirteenth Random Sample Laying Test : 1969-70, Department Of Agriculture, Western Australia

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

POULTRY RESEARCH STATION, WEMBLEY FIFTH PROGRESSIVE REPORT TO 30th AUGUST, 1970

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.

Choosing Your Lambing Time, T Marshall

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

SHEEP, pastures and labour are the major resources of the sheep enterprise but their productivity is greatly affected by the timing of operations associated with them.

This article discusses how the lambing time can be chosen to get maximum use from each resource.

Causes Of Low Lambing Percentages, Department Of Agriculture, Western Australia

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

West Australian Merino flocks average about 70 per cent, lambs marked each year. Reasons for this low percentage are that as many as 30 per cent, of ewes do not lamb, twinning rates are low and from 10 to 25 per cent, of lambs born die.

Among the research projects by the Department of Agriculture's Sheep and Wool Branch have been a number directed at the various stages of reproduction in the ewe. These have given some important leads on the causes of low lambing percentages.

If you have marked less than 60 per cent, lambs in the past several …

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 …

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

Aspen Bibliography

No abstract provided.

The Feasibility Of Avian Karyotypes In Taxonomy, Gerald Francis Shields

All Master's Theses

The purpose of this paper is twofold: first, to evaluate the usefulness of various karyotypic procedures using domesticated and passerine birds and second, to comment on the validity of the application of karyotypic data to taxonomy.

Thirteenth Random Sample Laying Test : 1969-70, Department Of Agriculture, Western Australia

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

FOURTH PROGRESSIVE REPORT TO 31 sr MAY, 1970

Average age of birds 305 days or 43 weeks and 4 days

Thirteenth Random Sample Laying Test : 1969-70, Department Of Agriculture, Western Australia

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

THIRTEENTH RANDOM SAMPLE LAYING TEST, 1969-70

SECOND PROGRESSIVE REPORT TO 1st MARCH, 1970 Average age of birds 215 days or 30 weeks and 5 days

Cytophotometric Determinations Of Dna In Karyotypes From Human Leukocyte Cultures Of Ten Males And Ten Females, Nancy Sue Whittaker

Masters Theses

No abstract provided.

A New Natricine Snake Of The Genus Thamnophis From Northern Mexico, Douglas A. Rossman

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

The Taxonomic Status Of Sturnira Bidens (Chiroptera: Phyllostomidae) With Notes On Its Karyotype And Life History, Alfred L. Gardner, John P. O'Neill

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

A New Species Of Blackbird (Agelaius) From Peru, Lester L. Short

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

Distributional Notes On The Birds Of Peru, Including Twelve Species Previously Unreported From The Republic, John P. O'Neill

Occasional Papers of the Museum of Natural Science, Louisiana State University

No abstract provided.

An Analysis Of Gene-Enzyme Variability In Natural Populations Of Drosophila Melanogaster And D. Simulans, Stephen J. O'Brien, Ross J. Macintyre

Biology Faculty Articles

Nine populations of D. melanogaster and two populations of D. simulans were analyzed for polymorphism in 10 gene-enzyme systems by the technique of gel electrophoresis. In the eight natural populations of D. melanogaster, an average of 54% of the enzymes were polymorphic, and the average heterozygosity was 22.7%. An experimental population of D. melanogaster, which has been maintained in a laboratory cage for 20 years, showed levels of polymorphism equivalent to those of natural populations. The D. simulans populations had much less variability. The possible factors involved in maintaining these polymorphisms are discussed.

Twelfth Random Sample Laying Test : 1968-1969 : Litter, Department Of Agriculture, Western Australia

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

TWELFTH RANDOM SAMPLE LAYING TEST,

1968-69-LITTER

POULTRY RESEARCH STATION, WEMBLEY

THIRD PROGRESSIVE REPORT TO 4th MAY, 1969

Ultrasonic Testing : An Aid To Better Breeding, B M. Goss

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

THE ultrasonic tester was originally developed as a metal flaw-detector for industrial purposes, and its usefulness for making carcass measurements on the live pig was first demonstrated about 10 years ago.

Breeding Better Pigs, B M. Goss

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

IN the past, pig breeders have tended to select animals on physical characteristics, many of which have little or no relevance to economy of production.

Selection techniques now available open up the possibility of improved pig production efficiency.

The Effects Of Some Silvicultural And Soil Treatments On Aspen (Populus Tremuloides Michx.) Reproduction In Northern Utah, Calvin O. Baker

Aspen Bibliography

No abstract provided.

The Effect Of Cattle, Sheep, And Other Factors On Aspen (Populus Tremuloides) Reproduction After Clear-Cut Logging In Southern Utah, Paul A. Lucas

Aspen Bibliography

No abstract provided.

Populus: A Bibliography Of World Literature, 1854-1963, R.E. Farmer Jr., J.S. Mcknight

Aspen Bibliography

No abstract provided.

Eleventh Random Sample Laying Test : 1967-68 Cages, Department Of Agriculture, Western Australia

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

ELEVENTH RANDOM SAMPLE LAYING TEST,

1967-68 - CAGES

POULTRY RESEARCH STATION, WEMBLEY

SIXTH PROGRESSIVE REPORT TO 3rd NOVEMBER, 1968

Twelfth Random Sample Laying Test : 1968-69 : Cages, Department Of Agriculture, Western Australia

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

TWELFTH RANDOM SAMPLE LAYING TEST,

1968-69 - CAGES

POULTRY RESEARCH STATION, WEMBLEY

SECOND PROGRESSIVE REPORT TO 2nd MARCH, 1969