Thesis (Ph. D.)--Cornell University, 1912.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1939. / Typescript. Includes abstract and vita. With this is bound 2 articles from Poultry Science, vol. XVII: The relationship between blood calcium and blood phosphorus and the effect of variations in the calcium content of the ration on ovulation and blood calcium changes in the laying pullet / by H.J. Deobald, J.B. Christiansen, E.B. Hart and J.G. Halpin. No. 2 (Mar. 1938), p. 114-119 -- The effect of partial or total oviduct removal on the calcium content of the blood of pullets / by H.J. Deobald, J.B. Christiansen, E.B. Hart and J.G. Halpin. No. 1 (Jan. 1938), p. 94-96. Includes bibliographies: leaves 12, 74-75.

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 81-84.

Thesis (Ph. D.)--University of Wisconsin, 1965. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Typescript, etc.

[No abstract available] / Land and Food Systems, Faculty of / Graduate

Farmers are confronted continually with the necessity of revising and reorganizing their production plans in order to maximize the net returns from the available resources. This need arises from the dynamics of price and yield fluctuations, which can only be estimated within a range. If future changes in prices and yields could be predicted with absolute certainty, a single plan could be formulated which would specify the resource combination at each point in time, for each change in techniques, and for each price situation. The present study involves an investigation of the resources employed by commercial market egg producers in the Lower Fraser Valley and Vancouver Island areas during the period of 1949 to 1951 to determine (1) the deviation of the actual resource combinations employed during each year from the theoretically optimum combination required for maximum net returns and (2) the effectiveness of alterations to the resource combination made by producers in attempting to adjust their operations to variations in the input-output price relationships. The production function method of analysis was used because it recognized the basic functional relationships in the production process and provided a quantitative analytical technique founded on general economic principles. The analysis was based on input- output data compiled from detailed records of 66, 57 and 45 commercial market egg enterprises for the respective years 1949, 1950 and 1951 ending on September 30. For the purpose of this analysis, the numerous individual resources employed in the production of market eggs were aggregated into the categories of (1) land, buildings and equipment, (2) laying flock, (3) labor, (4) feed, and (5) other cash expenses. A Cobb-Douglas production function was derived for each year by the least-squares method of fitting a linear multiple regression equation. The marginal value products of the resource categories, with all inputs fixed at their geometric means, were estimated by partial differentiation of the production function with respect to each input variable. As indicated by the coefficient of multiple determination, about 95 per cent of the variance in total output (gross income) from the market egg enterprises during each year was explained by the five input categories. According to the t-test, coefficients of the following input categories were statistically different from zero at the five per cent significance level: laying flock and feed in 1949; feed and other cash expenses in 1950; and laying flock and feed in 1951. All coefficients had a value less than 1.0, indicating diminishing marginal returns to all input categories. Returns to scale, as measured by the sum of the coefficients, were constant for each year. In each year, the marginal value products were larger for the input categories of laying flock and feed than for the other inputs. In view of this persistent inequality, it was apparent (1) that the theoretically optimum combination of resources for these egg enterprises was not attained in any of the three years and (2) that the adjustments in resource inputs from year to year did hot constitute a major improvement in the resource combination. The marginal value products of the various resources revealed the (average) results of the decisions taken by producers in using the resources at their disposal for the production of market eggs. The failure to achieve the most profitable combination of these resources was attributed to restrictions imposed by (1) production techniques and practices that prevented quick and precise adjustments to the input of certain resources, (2) inflexibility and indivisibility of resources, and (3) imperfect knowledge of output and prices in the future. Some of these restrictions may preclude the possibility of effective improvement in resource use in the short run. / Land and Food Systems, Faculty of / Graduate

The very low density lipoproteins (VLDL (MF)) from the granules of hen's egg yolk were isolated by a combination of preparative ultracentrifugation and agarose gel filtration. Ultracentrifugal, electrophoretic and chromatographic analyses were performed to characterize and assess the purity of the VLDL (MF) and apoVLDL. The Beckman Prep UV Scanner accessory to the ultracentrifuge was used in conjunction with an on-line data acquisition system for the determination of flotation/sedimentation coefficients. The software that was developed to permit rapid data analysis using this system is described. An agarose disc gel electrophoretic system was developed which, in combination with the use of sudan black B prestained lipoproteins, allowed for rapid electrophoretic analysis of large VLDL (MF) particles. Flotation velocity analysis of VLDL (MF) indicated a heterogeneous preparation with two major floating boundaries (Sf 75 and 207S). Alkylation of VLDL (MF) with iodoacetamide to prevent aggregation due to oxidation of sulfhydryl groups decreased the flotation rates of the macromolecules to Sf 41 and 108S. It is possible that the VLDL (MF) particles exist in a partially aggregated state in fresh egg yolk. Concanavalin A affinity chromatography of VLDL (MF) produced a retained and an unretained fraction. The retained fraction contained twice as much total carbohydrate as the unfractionated VLDL (MF), while the unretained VLDL (MF) contained half as much carbohydrate. All fractions were glycoproteins containing hexose, hexosamine and sialic acid sugar residues. VLDL (MF) was partially delipidated with n-heptane which preferentially extracted the neutral lipids and preserved the solubility of the phospholipid-protein residues. Two fractions were isolated by gel filtration and characterized by analytical ultracentrifugation and by their phospholipid/protein ratios. VLDL (MF) was delipidated using sodium deoxycholate (NaDOC) and ethanol-ether procedures. Removal of lipids by both methods produced aggregated apoprotein, but the NaDOC apoprotein remained soluble. That obtained from ethanol-ether was precipitated, but could be solubilized in sodium dodecylsulfate (SDS) or urea. Tetramethylurea (TMU) was used to delipidate VLDL (MF) and dissociate the apoprotein. Electrophoretic analysis indicated the presence of three apoprotein subunits, one of which was an aggregate of the other two. SDS electrophoresis of the proteins extracted from the TMU gels demonstrated that each band was heterogeneous, containing many polypeptides. ApoVLDL was dissociated into 22 polypeptides (MW ranging from 9,600-136,000 daltons) in the presence of urea, SDS and 2-mercapto-ethanol (BME). Fourteen of these bands were glycoprotein in nature, staining positively with Schiff reagent. In the absence of BME, only 18 bands were resolved, most of which contained higher molecular weight aggregates not present in the reduced samples. The apoVLDL was fractionated on 6% agarose columns containing 8M urea or 2mM SDS. Two apoprotein fractions were eluted from the SDS column, and three from the-urea column. The protein from the void volume of the urea column was an aggregate of the other two proteins. A correlation was found between the fractions eluted from the SDS column and the proteins extracted from the TMU gels. The molecular weights of the two apoproteins from the SDS column were analyzed by sedimentation equilibrium techniques. As plots of 1n c vs. r² were nonlinear, weight average molecular weights were calculated for each measured radial distance from the meniscus to the bottom of the cell. The high molecular weight component ranged from 33,000 to 166,000 daltons and the low molecular weight component ranged from 6,000 to 28,000. These values corresponded well with the molecular weight ranges of the polypeptides characterized by SDS gel electrophoresis. / Land and Food Systems, Faculty of / Unknown

No description available.