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The Sexual Behavior And Systematic Position Of The Hooded Merganser, Paul A. Johnsgard

Papers in Ornithology

It has been over 15 years since Delacour and Mayr (1945) first urged that the mergansers (Mergus)and the goldeneye-Bufflehead group (Bucephala) be merged into a single tribe (Mergini) rather than being maintained in separate subfamilies (Aythyinae and Merginae). Their reasons for this change were several, and included such points as the similarities in the downy young, female color patterns, occurrence of wild hybrids between the two genera, and tracheal structure. Indeed, except for the shape of the bill in these two groups there is no good means of distinguishing the two subfamilies. As Delacour and Mayr pointed out, bill shape …

Family Of Bobwhite Counts Glamours Birds, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Call Of Birds Strong Lure For Watchers, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Purple Martins Move To Trees Near Museum, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Activities Of Young Birds Interesting To Watch, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

America's Charming Bluebird Hard Hit By Population Loss, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Travelers Surprised By Variety Of Birds Seen, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Duck Stamp Purchaser Supports Bird Refugees, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Cardinals Enliven Premises, Excite Concern, Admiration, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Kentucky Warbler (Vol. 37, No. 2), Kentucky Library Research Collections

The Kentucky Warbler

No abstract provided.

A Histological Study Of The Postnatal Development Of The Bovine Testis, R. G. Fossland, A. B. Schultze

Nebraska Agricultural Experiment Station: Historical Research Bulletins

A limited number of detailed studies on the development of the bovine testis from birth to sexual maturity have been reported. Further study of bovine testis development appears desirable to furnish additional observations and to note variations that may occur during the developmental process. Information on the process of spermatogenesis should furnish a basis for experimental work designed to promote increased spermatogenic activity in the postpubertal testis as well as for work directed toward promoting complete spermatogenesis at an earlier than usual age. This report is a study of the histological picture of the testes from 56 bulls varying from …

The Life Cycle And Pathogenicity Of Eimeria Auburnensis, Wayne Norris Clark

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Coccidiosis in cattle is caused by microscopic one-celled sporozoa belonging to the order Coccidia and the genus Eimeria. Coccidiosis is a common disease of young calves that weakens or kills them, but the disease also occurs in older animals. Eleven species have been reported in cattle of the U.S.A.(Davis and Bowman, 1956). Of this number only two species, Eimeria bovis(Hammond et al., 1946) and Eimeria zurnii(Davis and Bowman, 1957) have been proven pathogenic for cattle, but except for Eimeria alabamensis(Davis et al., 1955) no experimental work has been done on other species.

Deviations In Serum Proteins Associated With Eimeria Bovis Infections In Calves And Some Related Immune Reactions, Paul R. Fitzgerald

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Bovine coccidiosis is a serious threat to the economy of the cattle industry in the United States. In 1954 the United States Department of Agriculture reported that over $10,000,000 was lost annually as a result of mortality and morbidity in cattle due to this parasite (1). These losses alone amounted to more than one fourth of the total loss in cattle due to parasitism.

Observations Of Pituitary Hormone Injections And Ripening Of Fish, D. K. Kaushik

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

A dependable source of quality fish spawn is a fundamental prerequisite for fish culture development. This is especially important inasmuch as most of the cultivable species do not breed in confined waters. Also, sport fisheries are gaining greater popularity, and subsequently the fish supply is being taxed. Still another need for fish spawn is in the ever increasing demand for bait minnows. Also, the construction of more and more dams has resulted in insurmountable obstacles for ascending and descending fish, which may ultimately result in complete destruction of some fisheries. Thus some measure of artificial propagation will have to be …

Coloring Is Deceptive In Many Bird Types (Birdname), Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

'Birds Of Tarrant County' Thorough Study, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Rarely Seen Rails Put On Bit Of Domestic Drama, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Many Warblers Seen In Alabama, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Hatchability Of Chicken Eggs As Influenced By Environment And Heredity, The, Walter Landauer

Storrs Agricultural Experiment Station

No abstract provided.

Nebraska Bird Review (April 1961) 29(2), Whole Issue

Nebraska Bird Review

TABLE OF CONTENTS

Wintering Bald Eagles in Nebraska, 1959-1960 ........................26

1956-1960 Nesting Reports ........................31

Dr. George Miksch Sutton ........................35

Dr. Olin Sewell Pettingill, Jr......................... 36

Fall Field Trips and Winter Meeting ........................37

Treasurer's Report ........................38

General Notes ........................39

Letter To The Editor ........................40

Book Reviews........................40

'Altricial' Birds Ugly At Hatching (Bird, Infan Or Culture?), Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Legends And Tales Of Birds Involved In Events Of Easter, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

When Did They Learn? Gulls Following Plow Bring Back Memories (Frank, Cali Gul), Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Robin Pair Meet, Mate, Build, Lay, Hatch, Feed, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

1961 Little International Agricultural Exposition Catalog, Little International Agricultural Exposition South Dakota State University

Little International "Little I" Agricultural Exposition Catalogs

No abstract provided.

Long-Billed Curlew Really Rare Sight, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Instinct Guides Martins Back To Former Homes, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Look At Mockingbirds Civilization's Effect On Birdlife Is Not All Bad, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Meadowlark Tops As 'Official' Bird, Jessie Maye Smith

Jessie Maye Smith Birds and Watchers Columns Collection

No abstract provided.

Kentucky Warbler (Vol. 37, No. 1), Kentucky Library Research Collections

The Kentucky Warbler

No abstract provided.