Digitized by Kansas Correctional Industries

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1940. / Typescript. Includes abstract and vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 67-68).

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In the first of three experiments, four Holstein multiparous dairy cows, equipped with ruminal and duodenal cannulas, were used to determine the impact of different methods of treating soybean meal (SBM) on ruminal degradability and intestinal digestibility of CP and amino acids (AA). Solvent extracted SBM (SE), expeller SBM (EP), lignosulfonate SBM (LS) and heat and soy hulls SBM (HS) were incubated in the rumen, in nylon bags, for various intervals up to 48h. Additional samples incubated for 16 h were pre-treated with pepsin HCI, and then used for determination of intestinal digestibility either in situ (mobile bag technique) or in vitro. Treatment of SBM (EP, LS, HS) increased rumen undegradable protein (RUP), and AA availability in 30%. Estimates of intestinal digestibility of AA and CP were lower when measured in vitro than in situ. Among the treated SBM products, four EAA (Ile, Leu, Phe and Val) showed differences in availability, with values consistently lower for HS than for LS. The second experiment involved a comparative assessment of the availability of lysine in SE and rumen protected SBM products (EP and LS). Lysine availability was assessed either by the increment in plasma flux of 15N lysine, the increment in intestinally digestible lysine (using chromic oxide as a digesta marker) or by the use of a "plasma lysine response curve" designed to predict intestinally available lysine. The plasma Lys flux was not different between the different SBM products. However, SE + 70 g.d-1 omasal infusion of Lys (SE70) increased Lys flux by exactly 70 g.d -1 above the SE treatment. No differences were observed on duodenal Lys flow, post-ruminal digestion and digestible Lys between the SBM diets (SE, EP, LS). Irrespective of the method of assessment, lysine availability was not altered by the method of treating SBM. The third study evaluated the relative impact of supplying rumen-undegraded protein (RUP) versus altering the carbohydrate source on milk yield and efficiency N usage for milk production. Protein supplementation (SE and EP) increased DMI, whereas the inclusion of beet pulp (BP) replacing 50% of high moisture shelled corn decreased DMI. The results of this research suggest that, under normal conditions of feeding, supplying rumen protected SBM to enhance the supply of intestinally available essential AA does not improve lactation performance; providing beet pulp as a source of readily fermentable fibre also failed to affect milk yield or efficiency of N usage for milk production by dairy cattle.

This thesis examines the pricing efficiency of the Quebec corn and soybean meal markets to answer a hypothesis on the part of the local livestock industry as to the existence of pricing inefficiency in the feed input industry. In evaluating the pricing efficiency of the markets, this research used two approaches: an analysis of market and an analysis using econometric models, focusing on price information structure accuracy and rapidity. The weekly data series of corn and soybean meal price are from selected cities in Canada and the US cover the crop years of 1990--1996. / The accuracy is addressed by applying Faminow's model for testing the pricing systems and Houck's model for testing price transmission symmetry. The results showed that the Quebec corn market is accurate based on the evidence of (i) a relatively unconcentrated market structure; (ii) evidence of an FOB pricing system; and (iii) symmetric price adjustments. Even though the soybean meal market is also based on an FOB pricing system, it is not accurate because the price adjustments are asymmetric and its market structure is highly concentrated. / The rapidity is addressed by applying Vector Error Correction (VEC) models in three ways: (i) by investigating the cointegration relationships, (ii) by assessing the strength of the relationships, and (iii) by measuring dynamic price response. The results showed that the strength of the relationships and the speed of Quebec corn price adjustment in response to external shocks are less than those found in Ontario and Southeastern US markets, while soybean meal is comparable to those markets. / Thus, by means of an assessment of market structure, marketing margin, price information transmission accuracy and rapidity, this research concludes that the corn market in Quebec is relatively pricing efficient while the soybean meal market is not.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1944. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographies: leaves 22-24, 70-73.

Thesis (Ph. D.)--Ohio State University, 2005. / Title from first page of PDF file. Document formatted into pages; contains xvi, 105 p.; also includes graphics (some col.) Includes bibliographical references (p. 95-105). Available online via OhioLINK's ETD Center

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