Life Sciences Commons^™

Relationship Between Measures Of Semen Quality And Fertility In Bulls Mated Under Natural Conditions, J. N. Wiltbank, W. W. Rowden, J. E. Ingalls

Historical Research Bulletins of the Nebraska Agricultural Experiment Station

An evaluation of the relationship between several measures of semen quality and fertility of bulls mated under natural conditions has been conducted over a three-year period. Semen was collected three different times with an electro-ejaculator from bulls used in the fertility tests. Collections were made at weekly intervals. Fertility was evaluated by mating bulls to heifers starting about three days after the last collection. Semen quality refers to the percent abnormals and the percent motility evaluated at the time of collection. Fertility was measured by the proportion of heifers that settled at natural service. Several multiple regression equations were calculated. …

Factors Affecting Nesting Success Of The Canvasback In The Aspen Parklands, Jerome H. Stoudt

USGS Northern Prairie Wildlife Research Center

The Minnedosa study area is located in the southwestern portion of Manitoba just south of the town of Minnedosa. It is 90 square miles in size and roughly square in shape. The Aspen Parkland, in which the study area is located, is characterized by gently rolling terrain and black soils. Mixed farming is the rule with emphasis on small grain production consisting of wheat, barley, and oats. Roughly 50 percent of the water areas in the parkland are ringed with aspen, Populus tremuloides, and large blocks of aspen are interspersed throughout the area. The Minnedosa area differs because of …

Kentucky Warbler (Vol. 41, No. 4), Kentucky Library Research Collections

Kentucky Warbler

No abstract provided.

Nebraska Bird Review (October 1965) 33(4), Whole Issue

Nebraska Bird Review

Table of Contents

1965 (Fortieth) Spring Migration and Occurrence Report ......................54

Two Unusual Birds Reported ......................65

Correction to 1964 Spring Report ......................65

Honorary Member - Harold J. D. Turner ......................66

Excerpts from Letters ...................... 66

M. A. Carriker, Jr. ...................... 68

A Parasitized Prairie Chicken Nest ......................68

Book Reviews ...................... 69

Index of Volume XXXIII ...................... 70

The Elusive Musk Ducks, Paul A. Johnsgard

Papers in Ornithology

If one were to try to choose the most remarkable duck in the world, serious consideration would have to be given the Australian Musk Duck (Biziura lobata) of the family Anatidae. Among its unusual features are the great dimorphism of the sexes (males weigh eight pounds or more and are about three feet from bill to tail; females weigh two to three pounds and measure about two feet), the leathery pendent lobe that is located on the lower mandible, the strong odor of musk that is prominent in males during the breeding season, and the remarkably large eggs (averaging one-half …

Ultrasonic Tracking Of Migratory Fishes With An Internal Tag, Ross M. Horrall, H. F. Henderson, A. D. Hasler

School of Natural Resources: Faculty Publications

First paragraph:

A small ultrasonic tag, 9 mm by 40 mm in size, has been developed by members of the fish orientation group at the University of Wisconsin. The tag emits a continuous signal at approximately 65 kc/sec. The signal is received via a directional hydrophone and a high quality communications receiver. Tracking ranges of up to 1 km have been obtained. The placement of the tag is internal: either into the stomach or into the body cavity of the fish. The tags and tracking equipment have been successfully employed in studies on the open water movements and orientation of …

The Coccidian Parasites (Protozoa, Sporozoa) Of Rodents, Norman D. Levine, Virginia Ivens

Harold W. Manter Laboratory: Library Materials

This monograph summarizes the known information on taxonomy, morphology, life cycle, hosts, location in the host, pathogenicity, geographic distribution, and cross-transmission studies of the 196 named species of coccidia of rodents. These include 176 species of Eimeria, 9 of Isospora, 3 of Wenyonella, 2 each of Cryptosporidium and Klossiella, and 1 each of Dorisiella, Caryospora, Tyzzeria, and Klossia. In addition, similar data are given for those forms for which insufficient information is available to justify assigning them names.

Eimeria, which is the most common genus, has been described from only 15% …

Paternal Half-Sib Correlations Between Pairs In The Same And Different Herds, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Correlations were computed between first lactation milk records expressed as deviations from herd-mate averages of pairs of Holstein paternal half-sibs in the same and in different herds. These were compared to the comparable daughter-dam regressions. After correcting the daughter-dam regression for environmental correlation and change in variance from the dam to the daughter generation, both the daughter- dam and paternal half-sib estimates of heritability were about .34, which suggests that maternal genetic variance is. unimportant. This estimate is, however, higher than the .25 found from the paternal half-sib estimate from an analysis for variance components.

The comparison of the half-sib …

Genetic Covariances Among Relatives For Dairy Lactation Records, L. Dale Van Vleck, G. E. Bradford

Department of Animal Science: Faculty Publications

Trios of first lactation records of a cow, her dam, and her granddam were analyzed in an attempt to distinguish between additive by additive genetic effects and maternal genetic effects as possible explanations of much higher heritability estimates from daughter-dam regression than from paternal half-sib correlations. The results based on first lactation records expressed as deviations from herdmate averages suggest that additive by additive effects, and probably environmental correlation contribute little or nothing to covariance between daughter and dam records. Genetic maternal effects may account for about 20% and direct additive genetic effects for 23% of within-herd variance for first …

Kentucky Warbler (Vol. 41, No. 3), Kentucky Library Research Collections

Kentucky Warbler

No abstract provided.

Mammal Populations And Their Effects On Red Elderberry In The Mud Creek Sheep Allotment, Stawberry Valley, Utah, Howard Duane Smith

Theses and Dissertations

The purpose of this study has been to determine : (1) the mammalian species present in the Mud Creek area; (2) the approximate population density of each trappable species; (3) the species responsible for the damage; (4) the stem density and frequency of Smbucus racemosa; and (5) the approximate extent of damage to the red elderberry stems.

Changes In Milk Production In Relation To Changes In Feeding And Management Practices In Dairy Herd Improvement Association Herds, J. B. Stone, J. D. Burke, H. R. Ainslie, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

All Holstein herds of over 20 cows which had automated data processed dairy herd improvement association (DHIA) records from Cornell laboratory for two consecutive years from 1960 to 1964 were used to determine production, feeding, and management changes. The average number of herds for the four 2-yr comparisons was 2,688, 60% in New York and the remainder in neighboring states. Results in the two locations agreed. The yearly changes and standard deviations of changes per cow for the New York herds were milk production, + 157 ± 400 kg; grain feeding, + 88 ± 241 kg; succulent forage, + 0.13 …

Correlations Among Records Of Unrelated Cows In The Same Herd And The Same And Different Year-Seasons, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Correlations were computed between pairs of first-lactation milk records of unrelated Holstein cows in New York, where the records were made in the same herd and same year-season of freshening, and in the same herd but different year-seasons of freshening. Records were expressed as deviations from herd-mate averages. The average correlation between pairs in the same herd-year-season was .01. The average correlation when the pair of records was made one season apart was .08, and two seasons apart was .06. The pattern of correlations between a pair of records made more than 3 or 2 yr apart appears to be …

Environmental Correlations In Sire Evaluation, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Correlations were computed among averages of first lactation deviations from herdmate averages of groups of artificially sired daughters of the same Holstein bulls. The groups were constructed by specifying the time interval between animals in the different groups. Comparison of the actual correlations with the expected correlations suggests that environmental correlations are small or nil among artificially sired halfsibs in New York. The correlations between initial and later groups of 20 or 40 daughter records at different time intervals are so close to the expected correlations that there is no support for the view that accuracy of prediction in sire …

Change In Variance Components Associated With Milk Records With Time And Increase In Mean Production, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

First-lactation milk records of artificially sired Holstein cows in New York were analyzed by a sire-by-herd variance component analysis separately for each year from 1954 to 1962. The two variables analyzed were 305-day, 2 ×, mature equivalent records and the mature equivalent records expressed as deviations from the average of their herd-mates. The total variance steadily increased with change in time. Most of the increase (r = .97) was accounted for by increase in mean production. The relative increase in the sire component of variance was slightly faster than the increase in residual variance. Thus, heritability estimated from the paternal …

Heritability Estimates Of Milk Production With Different Numbers Of Records Per Sire By Herd Subclass, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

The first-lactation milk records of 20,850 artificially sired Holstein cows and their darns were analyzed by a sire-by-herd, variance components model to determine if unequal numbers of records in the filled subclasses had any effect on the paternal half-sib correlation or the daughter-dam regression. The variance components were estimated with the number per subclass held constant at 1, 2, 3, 4, or 5. The records were also analyzed as deviations from herdmate averages. The analysis of deviations with one observation per subclass gave the highest heritability estimate from daughter-dam regression, .40, and the lowest from paternal half-sib correlation, .23. Analyses …

Nebraska Bird Review (July 1965) 33(3), Whole Issue

Nebraska Bird Review

Table of Contents

1964 (Seventh) Fall Record Report ...........................34

The Sixty-Fourth Annual Meeting ...........................47

Book Review........................... 48

In Memoriam- Miss Mary A. Towne........................... 48

Mississippi Kite Seen in Fontenelle Forest........................... 49

General Notes ...........................49

Excerpts from Letters ...........................50

Treasurer's Report- 1964 ...........................52

Genetic And Maternal Influence On The First Three Lactations Of Holstein Cows, L. Dale Van Vleck, G. E. Bradford

Department of Animal Science: Faculty Publications

Milk records of up to the first three lactations of artificially sired Holstein daughters and their dams were used to estimate heritability from both daughter-dam regression and paternal half-sib correlation. The within-herd estimates from records expressed as deviations from herd-mate averages were .37, .30, and .24 from daughter-dam regression for the first three lactations ; and the corresponding estimates from half-sib correlation were .24, .21, and .23. These results suggest a large maternal effect in the first lactation, a small amount in the second, and little in the third lactation. Analysis of the records not as deviations gave the same …

Linearity Of Heritability Of Holstein First-Lactation Milk Production, L. Dale Van Vleck, C. L. Hart

Department of Animal Science: Faculty Publications

The regression of daughter on dam first-lactation milk deviations from herd-mate averages was found to be linear from an analysis of 47,400 Holstein pairs. The linear equation was y=-25.6 + .210 (x -27.6) and the quadratic equation was y=-25.6 + .208 (x -27.6) + .0000222 (x²-44131.4) with correlation coefficients, .18258 and .18268, respectively. These results suggest that selection response can be predicted adequately even with very large selection differentials.

Kentucky Warbler (Vol. 41, No. 2), Kentucky Library Research Collections

Kentucky Warbler

No abstract provided.

A Comparative Population Study Of Small Vertebrates In The Uranium Areas Of The Upper Colorado River Basin Of Utah, Wilmer W. Tanner

Brigham Young University Science Bulletin, Biological Series

This paper constitutes a terminal report to the United States Atomic Energy Commission for contract AT(11-1)819. It provides not only a faunistic and floristic study of areas having a high and low surface radiation, but also includes a consideration of their general ecology. Major emphasis is placed on the variation of the external characteristics of the small vertebrates of these areas with a statistical analysis of those characters examined in the lizards. The study was conducted in southeastern Utah (Tanner 1963, see map) from October 1959 through 1964, and was conducted as a test of the variation effects of natural …

Front Matter, Vol. 7 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 7 No. 1

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Nebraska Bird Review (April 1965) 33(2), Whole Issue

Nebraska Bird Review

Table of Contents

A Study of Nesting Dickcissels in Nebraska ......................... 22

Honorary Members-Leroy M. Gates ......................... 25

Miss Doris B. Gates ......................... 26

In Memoriam-Frederick Ira Day ......................... 26

Book Reviews ......................... 27

Wintering Sandhill Cranes in Lincoln County ......................... 28

1964 Christmas Count ......................... 29

Comments ......................... 32

Apparatus For Holding The Individual Oysters Under Equal Water Flows, Dexter S. Haven, Reinaldo Morales-Alamo

VIMS Articles

No abstract provided.

1965 Little International Agricultural Exposition Catalog, Little International Agricultural Exposition South Dakota State University

Little International Agricultural Exposition Catalogs

No abstract provided.

Scorpions Of The Nevada Test Site, Willis J. Gertsch, Dorald M. Allred

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Mammals Of The Nevada Test Site, Clive D. Jorgensen, C. Lynn Hayward

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 6 No. 4

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 6 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.