Animal Sciences Commons^™

Levels Of Calcium And Phosphorus For Growing-Finishing Swine, G. W. Libal, E. R. Peo, Jr., R. P. Andrews, P. E. Vipperman, Jr.

Department of Animal Science: Faculty Publications

The calcium and phosphorus requirements of growing-finishing swine have not been satisfactorily resolved. Recently it was suggested that levels of calcium and phosphorus needed in diets of growing-finishing (G-F) swine for optimum growth and feed conversion may be different from those needed for optimum bone development (Miller et al., 1960; Lloyd et al., 1961; Rutledge et al., 1961; Combs et al., 1966). The problem of determining calcium and phosphorus requirements is further magnified by the observation of Chapman et al. (1955) that G-F swine do not utilize plant phosphorus as efficiently as inorganic phosphorus. In …

The Masked Duck In The United States, Paul A. Johnsgard, Dirk Hagemeyer

Papers in Ornithology

Reports on the first-known accounts of masked duck breeding in the United States.

Effects Of Dietary Levels Of Manganese And Magnesium On Performance Of Growing-Finishing Swine Raised In Confinement And On Pasture, A. J. Svajgr, E. R. Peo, Jr., P. E. Vipperman, Jr.

Department of Animal Science: Faculty Publications

Research on the optimum dietary levels of manganese and magnesium for growing swine is limited. Johnson (1940) fed pigs diets containing 0.3 to 100 ppm Mn and observed no difference in growth rate. Similarly, Liebholz, Speer and Hays (1962) found that 0.4 ppm Mn in the diet of baby pigs was sufficient to support maximum growth. A level of 4,000 ppm Mn was not toxic but growth rate of the pigs was reduced.

Growth Of Yorkshire Suckling Pigs, W. F. Gipp, W. G. Pond, L. Dale Van Vleck, P. D. Miller

Department of Animal Science: Faculty Publications

The birth weights and daily liveweights for 87 male and 99 female pigs reared under drylot conditions were obtained over a 3-week period and used to construct a growth curve for the very young male and female pig. Analysis of variance was used to test litter and sex main effects and the litter x sex interaction effect on liveweight. The daily standard deviations of the 186 pig sample were calculated and are presented in graphic form. No significant difference between the growth of male and female pigs of this young age were found. The average birth and first-, second- and …

Sire Evaluation For Economic Merit, J. W. Wilton, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Procedures for selecting sires are compared in terms of making maximum genetic progress in economic merit. A quadratic index, a simplified form of the quadratic index and a linear index to evaluate economic merit, and a restricted index to improve milk as much as possible while holding milk fat percentage constant, all result in nearly equal expected genetic progress in economic merit. Selection for milk production results in less expected genetic progress in economic merit, the extent of the decrease depending on the economic value of milk production at a given base test and on the test differential.

Evaluation of …

Whole Issue Nebraska Bird Review (January 1969) 37(1)

Nebraska Bird Review

Table of Contents

Barnacle Goose Taken in Nebraska.................... 2

Growth and Calculation of Age in the American Goldfinch.................... 3

1968 Fall Field Day ....................15

Albino Screech Owl ....................16

Systematic Status Of The Mastiff Bat, Eumops Perotis Renatae Pirlot, 1965, James D. Smith, Hugh H. Genoways

University of Nebraska State Museum: Mammalogy Papers

The mastiff bat, Eumops perotis renatae, described by Pirlot in 1966 and later elevated to specific status by the same author is herein regarded as junior synonym of Eumops perotis perotis (Schinz, 1821). Earlier reports of large Eumops from South America are reviewed in light of the present understanding of the relationship between Eumops perotis and E. trurnbulli.

Distribution Of The Porcupine, Erethizon Dorsatum, In Mexico, J. Knox Jones Jr., Hugh H. Genoways

University of Nebraska State Museum: Mammalogy Papers

The first Recent record of the porcupine, Erethizon dorsatum, from Mexico comprised fragmentary remains associated with human occupancy from a cave east of Cuatro Cienegas, Coahuila (Gilmore, 1947: 158-159). Later, Benson (1953 : 511-512) reported two specimens from western Sonora from < the lower flood plain of the Rio Sonora, close to the Gulf of California >> (one from 6 miles N Puerto Kino and the other from Rancho Santa Ana, about 45 miles W Hermosillo), and Dickerman (1962: 108) recorded the species from Hda. Las Margaritas in northern Coahuila. No additional reports of Recent porcupines from Mexico have come to our attention, and four specimens of Erethizon dorsatum couesi Mearns, 1897, in the Museum …

Some Observations On Maccoa Duck Behaviour, Paul A. Johnsgard

Paul Johnsgard Collection

The recent comprehensive review of Maccoa Duck Oxyura maccoa biology by Clark (1964) has provlded the first detailed summary of the species' reproductive behaviour patterns and other aspects of breeding in this little-studied stiff-tail. It has been evident that the evolutionary relationships of the Maccoa Duck to the other southern hemisphere stiff-tails and the northern species of Oxyura are still uncertain at best, as evidenced by the varied taxonomic treatment that the Maccoa has received from Delacour and Mayr (1945), who regarded it as a race of O. australis, from Boetticher (1952), who consldered it as a race of O. …

Mourning Dove Status Report, 1967, James L. Ruos, Duncan Mcdonald

United States Fish and Wildlife Service: Publications

Nationwide dove population indexes in the 1967 Mourning Dove Status Report were obtained by essentially the same data gathering and analyzing procedures as in 1966. A refinement was made in the base year index, using the mean of the 1966 and 1967 readings as the base for all States. There was a slight adjustment in physiographic region boundaries.

Notes On Bats From The Mexican State Of Zacatecas, Hugh H. Genoways, J. Knox Jones Jr.

University of Nebraska State Museum: Mammalogy Papers

Much of the Mexican state of Zacatecas lies in the area ascribed to the Mexican Plateau. Along the western border and in the southwest, however, the state encompasses a portion of the Sierra Madre Occidental, and perhaps more importantly, from a zoogeographic view, the Rio Juchipila, a major tributary of the Rio Grande de Santiago, drains the southern "panhandle." The valley of the Juchipila supports tropical vegetation as perhaps do the valleys of several other smaller tributaries of the Rio Grande that barely reach the southern part of the state. The setting of southern Zacatecas suggests, therefore, considerable faunal diversity.

Whole Issue Nebraska Bird Review (Oct 1968) 36(4)

Nebraska Bird Review

TABLE OF CONTENTS

1968 (Forty-third) Spring Migration and Occurrence Report ......................70

Three Apparently New Records for Nebraska ......................76

Book Reviews...................... 78

Notes ......................81

Index of Volume XXXVI ......................85

A Review Of Parental Carrying Of Young By Waterfowl, Paul A. Johnsgard, Janet Kear

Papers in Ornithology

A review of literature reveals that published accounts of parental carrying among waterfowl are numerous and of diverse origins. Parental carrying on the back while swimming has been reliably seen in three species of swans, two sheldgeese, and at least seven species of ducks. Parental carrying of young in flight has also been reported for at least 16 species representing seven of the generally recognized waterfowl tribes. The majority of such accounts have involved carrying the young in the bill, a possibility that is somewhat substantiated by reliable observations of egg or eggshell carrying by females of several species. In …

Measuring Milk Flow Of Dairy Cows, G. H. Schmidt, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Milk flow measurements on 124 cows were analyzed to determine how they are affected by vacuum level, pulsation rate, pulsation ratio of the milking machine, and the breed, age, stage of lactation, and milk yield of the cow. Average rate of flow prior to machine stripping, yield during the first minute, and yield during the first 2 rain of milking were highly correlated with maximum rate of milk flow. These measurements were significantly increased by days in milk, vacuum level, pulsation rate, pulsation ratio, and total yield. Age at calving had a slight effect on yield during the first minute …

Relative Selection Efficiency In Retrospect Of Selected Young Sires, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

The indexes used in retrospect in estimating one-half genetic value (daughter superiority) of progeny of 541 Holstein matings contracted by Eastern Artificial Insemination Cooperative were determined. A set of information on relatives to be complete would include records of paternal sisters, the dam, paternal sisters of the dam, maternal sisters, maternal grandam, and maternal sisters of the dam. The average index of daughter superiority for the 541 progeny was between 406 and 455 kg of milk, depending on which combination of relatives was used. Paternal sisters accounted for 45 to 50% of the total daughter superiority. Records of maternal relatives, …

Whole Issue Nebraska Bird Review (July 1968) 36(3)

Nebraska Bird Review

TABLE OF CONTENTS

Avian Antagonistic Response to Potential Red-headed Woodpecker Predation .......................50

The Sixty-seventh Annual Meeting....................... 52

Additions to Lincoln County Checklist .......................54

Book Reviews....................... 57

1967 (Tenth) Fall Occurrence Report .......................58

Notes .......................67

Correction to 1967 Nebraska Nesting Survey .......................68

The "New" Cover .......................68

Foraging Dives By Surface-Feeding Ducks, Janet Kear, Paul A. Johnsgard

Papers in Ornithology

Recently, R. I. Smith (1966. Wilson Bull., 78:483-484) questioned, among other things, the occurrence of foraging dives by Pintails (Anas acuta). The authors note observations and published accounts of diving behavior of wild Pintails as well as a number of other surface-feeding species.

Improvement Of Beef Cattle Through Breeding Methods. Summary Of Results From Regional Project Nc-1, Larry V. Cundiff, Keith E. Gregory

Nebraska Agricultural Experiment Station: Historical Research Bulletins

This publication is a revision of North Central Regional Publication 120, published by the Nebraska Agricultural Experiment Station (Research Bulletin 196) in July, 1961. It summarizes the more important results from this project during its first 19 years of operation. It is by no means complete and includes only what is considered to be the "highlights" of findings at this time. A bibliography of all publications that provided the basis for this summary statement is included. This publication is in the nature of a progress report on many aspects of beef cattle breeding research. Although it is based on considerably …

Selection Of Dairy Cows For Economic Merit, J. W. Wilton

Department of Animal Science: Faculty Publications

Selection of dairy cows for economic merit requires the use of a model for genetic merit that involves the cross-product of the genetic values for milk and milk fat percentage. A linear and a quadratic index are described as procedures for selection of cows, the linear index being b₁p_m + b₂p_t and the quadratic index being b₁p_m + b₂p_t + b₂p_m² + b₄p_t² + b₅p_mp_t where p_m and p_t are the phenotypic deviations …

Whole Issue Nebraska Bird Review (April 1968) 36(2)

Nebraska Bird Review

TABLE OF CONTENTS

Growth of Nestling Goldfinches Compared to Adult Size and Differential Development Rate of Structures in Relation to their Function ......................22

Winter Meeting......................32

A Golden Eagle Nest in'the Pine Ridge......................33

1967 Nebraska Nesting Survey......................35

1967 Christmas Count......................42

1968 Migratory Bird Stamp......................46

Notes......................46

Treasurer's Report......................48

Distributional Changes And Interaction Between Prairie Chickens And Sharp-Tailed Grouse In The Midwest, Paul A. Johnsgard, Robert E. Wood

Papers in Ornithology

The "prairie grouse" of North America present an interesting example of the effects of human activities on breeding distribution patterns of birds, with resulting changes in geographic distribution and spacial isolation. Thus, the Heath Hen (Tympanuchus cupido cupido) was one of the most familiar birds to the early colonists, who relied heavily on it for food. Ultimately, loss of habitat caused the Heath Hen's extinction. When the vast tall-grass prairies west of the Appalachians were settled, Greater Prairie Chickens (T. c. pinnatus) were probably more plentiful, and greatly increased as woods were cleared and grain crops supplemented native grasses. With …

Variation Of Milk Records Within Paternal-Sib Groups, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Differences between daughter-dam and paternal sib estimates of heritability of first lactation milk yield have not been explained for New York data. Deviations of first lactation records from herdmate means of 155,070 artificially sired Holsteins were analyzed to examine the effect of unequal within group variances on the paternal sib estimate of heritability. The statistical model used to describe the data was y_y = μ + s_i + e_iy with σ ²yi = σ ²_s + = σ²_ei. Estimates of the within sire-group variances, σ₁ ²_ei, were heterogeneous (P …

Influence Of Advance In Season On Nutritive Value Of Forage Consumed By Cattle Grazing Western Nebraska Native Range, C. L. Streeter, D. C. Clanton, O. E. Hoehne

Nebraska Agricultural Experiment Station: Historical Research Bulletins

The purpose of this study was to determine the influence of the advance in season on the nutritive value of forage consumed by cattle grazing western Nebraska summer range. Eleven digestion trials were conducted during the summer grazing season of two consecutive years.

The Evolution Of Duck Courtship, Paul A. Johnsgard

Papers in Ornithology

The courtship of ducks is unusual in several aspects. In temperate zones it generally begins very early, usually on the wintering grounds, so courtship is not a manifestation of territorial proclamation and defense as is the case with many songbirds. Nor, because of its early initiation, is courtship closely correlated with gonad growth and fertilization; rather, pair formation is normally completed prior to the period of maximum gonadal activity. Therefore, reproductive behavior in ducks may be conveniently divided into an early phase of conspicuous displays associated with actual pair formation, followed by the later and less elaborate behavior patterns concerned …

A Brief History Of The Namru-3 Medical Zoology Program, Harry Hoogstraal

United States Naval Medical Research Unit 3: Publications

The NAMRU-3 Medical Zoology program began during Easter week of 1950. We had just closed the NAMRU-3 field station at Torit, in Equatoria Province of soulheastern Sudan, and were heading homeward to the United States. However, the offer to remain in Egypt for a year or two to develop a Medical Zoology department at NAMRU-3 provided an interesting challenge after working for several years in tropical forests and grasslands of Africa and other continents. We shall briefly describe subsequent events under four headings: (1) Medical Zoology in Egypt, (2) Ticks and Tickborne Diseases of the World, (3) Kala Azar in …

The Role Of Adventitious Reinforcement In Operant Discrimination, Alan Kamil, John W. Davenport

Avian Cognition Papers

Rats were trained in 2 S^D-S^Δ discrimination experiments in which the effects of an S^D-postponement contingency during S^Δ and temporal regularity of S^Δ duration were assessed. Experiment I showed that discrimination is markedly facilitated by the presence of an S^D-postponement contingency of either fixed or variable duration. Experiment II showed that variable-duration S^Δ periods in a noncontingent schedule can also greatly enhance formation of an operant discrimination. These effects were attributed to differences in the probability of adventitious reinforcement of S^Δ behavior by S^D events.

Whole Issue Nebraska Bird Review (Jan 1968) 36(1)

Nebraska Bird Review

TABLE OF CONTENTS

1967 (Forty-second) Spring Migration and Occurrence Report ...................2

Notes ...................10

Swans ...................16

1967 Fall Field Day...................19

Pritchard Designs 1968 "Duck" Stamp ...................20

In Memoriam - Leroy M. Gates ...................20

Weight Gain And Carcass Measurements Of Pigs From Gilts Fed Adequate Vs. Protein-Free Diets During Gestation, W. G. Pond, J. A. Dunn, G. H. Wellington, J. R. Stouffer, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

Fifty-two weanling pigs from six litters(Pond et al., 1968) were fed a standard 18% protein corn-soybean meal diet from weaning to slaughter. The six litters were from gilts paired on the basis of parturition date so that one gilt fed the control diet and one fed the “protein-free” diet (0.5% protein) from week 4 of pregnancy to parturition made tip each pair. Each dam was fed the control diet throughout lactation and nursed one-half of her own litter and one-half of a pairmate’s litter resulting from reciprocal transfer of one-half of each litter at birth. Individual bodyweight gains and feed …

Relationships Among The Parameters Of Milk Production, Constituent Production, And Constituent Percentage, J. W. Wilton, L. Dale Van Vleck

Department of Animal Science: Faculty Publications

A method of finding the parameters pertaining to one of the variables of milk production, constituent production, and constituent percentage when the parameters pertaining to the two other variables are known is presented. The method is based on the expectation of products of random variables. This method and the delta approximation method are compared to sampling estimates from simulated data.

Some Putative Mandarin Duck Hybrids, Paul A. Johnsgard

Paul Johnsgard Collection

Prestwich (1960) and Gray (1958) have concluded, mirroring Delacour and Mayr (1945) and Seth-Smith (1922), that the Mandarin Duck is unable to hybridize, even with its nearest living relative the Wood Duck. After reviewing the literature, however, I listed (1960) the Mandarin Duck as having probably hybridized with the Wood Duck, and also mentioned the possibility of hybridization with one or more species of Anas. Since then I have been hopeful that actual specimens of Mandarin Duck hybrids might be located to substantiate this vulnerable position, and it is now possible to report on some probable hybrids.