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Genetics and Genomics

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Articles 9211 - 9240 of 9413

Full-Text Articles in Life Sciences

New Cattle Breeds : How Do We Use Them?, J L. Anderson Jan 1973

New Cattle Breeds : How Do We Use Them?, J L. Anderson

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

Traditionally, beef production in Australia has been based on a few of the many breeds that developed in the United Kingdom. Pedigree breeding was used to maintain these breeds and was probably a sound policy, when combined with selection on performance, to maintain and concentrate merit in stud herds.

Emphasis on pure breeding has caused many prejudices against the practices of mixing and selection which were the original bases of breed formation.

Despite the adaptation of British breeds to the various environments in Australia there was, and still is, continuous interest in introducing other breeds of cattle to improve beef …


Subjective Evaluation Of Teat Canal Anatomy, R. D. Appleman Jan 1973

Subjective Evaluation Of Teat Canal Anatomy, R. D. Appleman

Department of Animal Science: Faculty Publications

Since radiographic techniques have shown that streak canals with larger diameters tend to milk-out faster and are more susceptible to new intramammary infections, a practical visual test was sought to provide easier determination of cows with either extremely narrow (slow milking) or extra wide (susceptible to new infections) streak canals.

A subjective teat classification scheme was developed to describe five different teat-end shapes in 159 Holstein and Brown Swiss cows in the University of Nebraska dairy herd. Approximately one-fourth of the cattle had pointed or round teat ends, one-half had fiat or near flat, and one-fourth were either disk or …


The Serlogical Specificity Of The Lectin From Lens Culinaris, Deborah Ward Heritage Jan 1973

The Serlogical Specificity Of The Lectin From Lens Culinaris, Deborah Ward Heritage

Theses and Dissertations

Lens culinaris, the common lentil, contains a lectin which has been shown to be specific for a glycoprotein saliva antigen and a glycolipoprotein serum antigen. Both the saliva and serum precipitin reactions with the lectin are directly inhibited with saccharides, especially those related to D-mannose. Electrophoresis of the serum antigen showed that it migrates as three bands, while appearing as a single band in double diffusion precipitin patterns. Quantitative studies of the saliva antigen levels by hemagglutination inhibition titration indicated a polygenic, quantitative mode of inheritance with a minimum heritability of O. 34. Blood group ABH secretor individuals were found …


N-Methyl-N’-Nitro-N-Nitrosoguanidine Induced Dominant And Recessive Mutations In Zea Mays, Frank Charles Janca Dec 1972

N-Methyl-N’-Nitro-N-Nitrosoguanidine Induced Dominant And Recessive Mutations In Zea Mays, Frank Charles Janca

Masters Theses

No abstract provided.


The Α-Glycerophosphate Cycle In Drosophila Melanogaster. Iii. Relative Viability Of "Null" Mutants At The Α-Glycerophosphate Dehydrogenase-1 Locus, Stephen J. O'Brien, Bruce Wallace, Ross J. Macintyre Nov 1972

The Α-Glycerophosphate Cycle In Drosophila Melanogaster. Iii. Relative Viability Of "Null" Mutants At The Α-Glycerophosphate Dehydrogenase-1 Locus, Stephen J. O'Brien, Bruce Wallace, Ross J. Macintyre

Biology Faculty Articles

No abstract provided.


Spontaneous Mutation Rate In The Dumpy Region Of Drosophila, John B. Jenkins Oct 1972

Spontaneous Mutation Rate In The Dumpy Region Of Drosophila, John B. Jenkins

Biology Faculty Works

No abstract provided.


Notes On The Systemics Of Proechimys (Rodentia: Echimyidae), With Emphasis On Peruvian Forms, James L. Patton, Alfred L. Gardner Sep 1972

Notes On The Systemics Of Proechimys (Rodentia: Echimyidae), With Emphasis On Peruvian Forms, James L. Patton, Alfred L. Gardner

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

No abstract provided.


New Species Of Philander (Marsupialia: Didelphidae) And Mimon (Chiroptera: Phyllostomidae) From Peru, Alfred L. Gardner, James L. Patton Sep 1972

New Species Of Philander (Marsupialia: Didelphidae) And Mimon (Chiroptera: Phyllostomidae) From Peru, Alfred L. Gardner, James L. Patton

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

No abstract provided.


Yields From 18-Year-Old Aspen Via Total Tree Harvesting, M. K. Benson, D. W. Einspahr Jun 1972

Yields From 18-Year-Old Aspen Via Total Tree Harvesting, M. K. Benson, D. W. Einspahr

Aspen Bibliography

Described are the results of harvesting the above-ground parts of an 18-year-old aspen stand and the observations made on the initial suckering of the new stand. The yields for the stand of 17.7 cunits per acre were greater than predicted yields of comparable material for the site at age 35. Suckering on the area the first year after cutting averaged 37,000 aspen stands per acre and 2.6 feet in height.


Natural Succession In North-Central Minnesota, Henry L. Hansen, Vilis Kurmis Jan 1972

Natural Succession In North-Central Minnesota, Henry L. Hansen, Vilis Kurmis

Aspen Bibliography

No abstract provided.


Sheep Meat Production Trial, Department Of Agriculture, Western Australia Jan 1972

Sheep Meat Production Trial, Department Of Agriculture, Western Australia

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

Better understanding of Middle- East, European and Asian market requirements for Australian sheep has influenced the design of a large meat production trial at Avondale Research Station.

The trial will supply basic information on sheep meat production and involves examples of breed types available in Western Australia and capable of supplying young, lean animals all the year round.


Cancer Eye Of Cattle, M R. Gardiner, J. L. Anderson, D. E. Robertson Jan 1972

Cancer Eye Of Cattle, M R. Gardiner, J. L. Anderson, D. E. Robertson

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

Cancer of the eye and eyelids is mainly a disease of cattle, although it occasionally occurs in most species of animals and in man. It is the most common cancer in cattle, especially in certain breeds.


Meat From The Dairy Herd, R A. Bettenay Jan 1972

Meat From The Dairy Herd, R A. Bettenay

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

Beef raising is a profitable sideline for many West Australian dairy farmers and gives their farming operation flexibility and versatility.

With suitable management and feeding the weight gains and consumer acceptance of dairy beef allow it to compete strongly with beef from other sources.

The breeds most common on W.A. dairy farms are well suited to beef production.


An Allometric Model For Bole Biomass Estimates Of Spruce And Aspen In Southwestern Colorado, Thomas D. Landis Jan 1972

An Allometric Model For Bole Biomass Estimates Of Spruce And Aspen In Southwestern Colorado, Thomas D. Landis

Aspen Bibliography

No abstract provided.


Aspen Minnesota's No. 1 Tree, George Rossman, Bob Rossman, Allen Rossman Jan 1972

Aspen Minnesota's No. 1 Tree, George Rossman, Bob Rossman, Allen Rossman

Aspen Bibliography

For thousands of years after the last glaciers disappeared from northern Minnesota, the forces of nature worked to develop a magnificent forest of predominantly white and red pine. Stands of big pines covered more than 5 million acres.


Deer And Aspen, American Box Board Co. Jan 1972

Deer And Aspen, American Box Board Co.

Aspen Bibliography

He's a big eater.


The Gene Frequencies Of Ten Different Alleles In Man As Determined By The Hardy-Weinberg Equilibrium, Elizabeth Suzanne Shaw Jan 1972

The Gene Frequencies Of Ten Different Alleles In Man As Determined By The Hardy-Weinberg Equilibrium, Elizabeth Suzanne Shaw

Masters Theses

No abstract provided.


Economic Operability - Factors Affecting Harvest And Transport Costs, Dennis P. Bradley, Frank E. Biltonen Jan 1972

Economic Operability - Factors Affecting Harvest And Transport Costs, Dennis P. Bradley, Frank E. Biltonen

Aspen Bibliography

No abstract provided.


A New Species Of Sturnira (Chiroptera: Phyllostomidae) From Peru, Alfred L. Gardner, John P. O'Neill Jun 1971

A New Species Of Sturnira (Chiroptera: Phyllostomidae) From Peru, Alfred L. Gardner, John P. O'Neill

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

No abstract provided.


Systemics Of The Neotropical Populations Of Thamnophis Marcianus (Serpentes: Colubridae), Douglas A. Rossman Jun 1971

Systemics Of The Neotropical Populations Of Thamnophis Marcianus (Serpentes: Colubridae), Douglas A. Rossman

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

No abstract provided.


A New Species Of Diploglossus (Sauria: Anguidae) From Hispaniola, Richard Thomas Jun 1971

A New Species Of Diploglossus (Sauria: Anguidae) From Hispaniola, Richard Thomas

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

No abstract provided.


Preliminary Estimates Of Bark Percentages And Chemical Elements In Complete Trees Of Eight Species In Maine, Harold E. Young May 1971

Preliminary Estimates Of Bark Percentages And Chemical Elements In Complete Trees Of Eight Species In Maine, Harold E. Young

Aspen Bibliography

Five tables were prepared to show the relative amount of bark on each of the tree components, the concentration and range of 12 chemical elements in the bark of each tree component, the proportion of each of the chemical elements in the bark of that element in the complete tree, and the proportion of each element in the bark as compared to the wood and bark of the merchantable bole. There is an overall 4:6:1 wood to bark ratio, but due to the higher concentration of the elements in the bark, the proportion of the elements in the bark is …


Methods Of Cattle Identification For The Farmer, R C. Burking Jan 1971

Methods Of Cattle Identification For The Farmer, R C. Burking

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

THE value of management decisions in day-to-day dairy herd management, such as breeding, selection, and culling, depends on accurate identification of individual animals.

A report on tests of some methods of cattle identification available to farmers.

This article is concerned only with methods of identification of cattle on the farm. It is the farmer's responsibility to brand his stock with his registered brand to comply with the requirements of the Brands Act, in addition to any brands or tags applied for his own management purposes.

Any marks other than the registered brand or earmark must be clearly distinguishable from, and …


Thirteenth Random Sample Laying Test : 1969-70, Department Of Agriculture, Western Australia Jan 1971

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

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

SLXTH PROGRESSIVE REPORT TO 1st NOVEMBER, 1970 AVERAGE AGE OF BIRDS 459 DAYS OR 66 WEEKS

POULTRY RESEARCH STATION, WEMBLEY

FINAL REPORT TO 500 DAYS


Elementary Human Genetics, A Help To Teachers, Elizabeth W. Reed Jan 1971

Elementary Human Genetics, A Help To Teachers, Elizabeth W. Reed

Journal of the Minnesota Academy of Science

ABSTRACT - Two pilot courses in human genetics, which were sponsored by the Minnesota Human Genetics League, are described. One was given in Minneapolis and one in Osseo, Minn. Each course consisted of ten two-hour class sessions, carried professional credits and was geared to the level of elementary and high school teachers, principals and special education personnel who made up the class membership.


Fourteenth Random Sample Laying Test : 1970-71, Department Of Agriculture, Western Australia Jan 1971

Fourteenth Random Sample Laying Test : 1970-71, Department Of Agriculture, Western Australia

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

FIFTH PROGRESSIVE REPORT TO 29th AUGUST, 1971 AVERAGE AGE OF BIRDS. 397 DAYS, OR 57 WEEKS


Cattle Breeds For Beef Production In W.A, J L. Anderson Jan 1971

Cattle Breeds For Beef Production In W.A, J L. Anderson

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

BREEDS develop because people select animals for characters which are useful to them in their own environment.


Fourteenth Random Sample Laying Test : 1970-71, Department Of Agriculture, Western Australia Jan 1971

Fourteenth Random Sample Laying Test : 1970-71, Department Of Agriculture, Western Australia

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

THIRD PROGRESSIVE REPORT TO 2nd MAY, 1971 AVERAGE AGE OF BIRDS 278 DAYS OR 39 WEEKS AND 5 DAYS and

FOURTH PROGRESSIVE REPORT TO 30ft MAY, 1971 AVERAGE AGE OF BIRDS 306 DAYS OR 43 WEEKS AND 5 DAYS


Fourteenth Random Sample Laying Test : 1970-71, Department Of Agriculture, Western Australia Jan 1971

Fourteenth Random Sample Laying Test : 1970-71, Department Of Agriculture, Western Australia

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

POULTRY RESEARCH STATION, WEMBLEY REARING RESULTS AT HOUSING (21 WEEKS AND 3 DAYS) and

SECOND PROGRESSIVE REPORT TO 28th FEBRUARY, 1971 AVERAGE AGE OF BIRDS 214 DAYS OR 30 WEEKS AND 4 DAYS


Interception Per Canopy In A Multi-Storied Largetooth Aspem Community, John R. Clements Jan 1971

Interception Per Canopy In A Multi-Storied Largetooth Aspem Community, John R. Clements

Aspen Bibliography

No abstract provided.