No description available.

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Thesis (Ed.D.)--Teachers College, Columbia University, 1967. / Typescript; issued also on microfilm. Includes tables (part. folded). Sponsor: Walter E. Sindlinger. Dissertation Committee: Kenneth D. Wann. Includes bibliographical references.

Thesis (M.A.S.A.)--Ohio State University, 1950. / Available online via OhioLINK's ETD Center

Thesis (Ph. D.)--Aristoteleio Panepistēmio Thessalonikēs, 1987. / Summary in English. Includes bibliographical references (p. [199]-208).

Master of Science / Department of Animal Sciences and Industry / Cassandra Jones / Three experiments were conducted to analyze the average mycotoxin concentration that may be reduced by cleaning corn, and to determine how removing broken kernels may affect nursery pig growth performance. A fourth and fifth experiment evaluated pellet processing parameters and their effects on gelatinized starch, phytase stability, pellet quality, and nursery pig growth performance. In Exp. 1 and 2, corn was divided into twenty 150 kg runs then cleaned by mechanical sieving. Run were randomly assigned to 1 of 4 experimental treatments: 1) no screen 2) 12.7 mm screen, 3) 4.8 mm screen, and 4) 12.7 + 4.8-mm screen. Across both experiments, cleaning reduced (P < 0.05) aflatoxin and fumonisin concentration by an average of 26% and 42.5%, respectively, compared to the original uncleaned corn level. In Exp. 3, 360 nursery pigs were evaluated to determine the impact of cleaning or pelleting on growth performance. Treatments were arranged in a 2 × 3 factorial with corn type (uncleaned vs. cleaned) and feed form (mash vs. pelleted from either mill A or B). Neither cleaning corn nor pellet mill type affected (P > 0.19) nursery pig growth performance. Pelleting improved (P < 0.0001) G:F by 7.6% compared to mash diets. This improvement in G:F is consistent when pelleting diets, however pellet processing parameters can influence this improvement percentage. For these reasons, Exp. 4 was a 3 × 4 factorial design with 3 pellet mills (model 3016-4, 1000 HD, or CL-5, California Pellet Mill Co., Crawfordsville, IN), that produced samples collected at 4 locations (initial, post-conditioner, post-die, or post-cooler). Across each pellet mill, the greatest gelatinized starch increase (P < 0.05) was found post-pellet die, while phytase stability decreased (P < 0.05) by 70% after conditioning feed to 85˚C. This decrease led to substituting phytase in the diet for other sources of phosphorus for Exp. 5, which was a 2 × 3 factorial design plus a control, with pellet diameter (4.0 or 5.2 mm), conditioning temperature (low, medium, or high), and mash, created seven experimental treatments. Overall, neither the pellet diameter × conditioning temperature interaction, nor the main effects, affected (P > 0.06) nursery pig growth performance, even though pellet quality improved (P < 0.0001) when increasing conditioning temperature. These data suggest that cleaning is an effective method to legally reduce aflatoxin and fumonisin concentration, and that increasing conditioning temperature improves pellet quality, but neither impacts nursery pig growth performance.

Made available in DSpace on 2014-06-11T19:30:20Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-01-25Bitstream added on 2014-06-13T20:20:44Z : No. of bitstreams: 1 ciavatta_sf_me_botfca.pdf: 3454572 bytes, checksum: f31729f851b589b38098fc17eb7c2832 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Este estudo teve por objetivo verificar a influência do fracionamento da adubação na produção e qualidade de mudas de Eucalyptus spp. nos períodos de inverno e verão. O experimento foi conduzido no Viveiro do Departamento de Recursos Naturais / Setor de Ciências Florestais, na Fazenda Experimental Lageado, pertencente à Faculdade de Ciências Agronômicas (FCA) da UNESP, no município de Botucatu - SP. As espécies estudadas foram: no inverno, o Eucalyptus grandis Hill. Ex. Maiden e no verão o Eucalyptus grandis Hill. Ex. Maiden, o Eucalyptus urophylla S.T. Blake e o híbrido Eucalyptus grandis vs. Eucalyptus urophylla (Eucalyptus urograndis). O substrato usado foi o produto comercial denominado Mec Plant® - Florestal 3. O delineamento estatístico foi inteiramente casualizado, composto por 4 tratamentos caracterizados pelas freqüências de adubações, sendo T1 a T4 respectivamente, mudas fertirrigadas semanalmente, duas e três vezes na semana e diariamente. Os tratamentos foram constituídos por 5 repetições de 48 plantas cada, sendo as 24 e 12 centrais, respectivamente, para o experimento de inverno e verão, as consideradas úteis para as avaliações. Foram avaliadas as seguintes características nas mudas: altura da parte aérea (H); diâmetro de coleto (DC); massas de matéria seca da parte aérea (MSA), das raízes (MSR) e total (MST); estruturação das raízes; transpiração; teores e acúmulos de macro e micronutrientes da parte aérea e radicular. Concluiu-se que, para o período de inverno, a adubação mais freqüente, conseqüentemente a mais diluída, proporcionou um melhor desenvolvimento e qualidade da muda, embora a transpiração tenha sido superior para esse tratamento. Para o período de verão, o híbrido E. urograndis não teve seu desenvolvimento e qualidade influenciados... / The present study had for object to verify the influence of fertilization fraction in the production and quality of Eucalyptus spp. seedlings in winter and summer periods. The experiment was conducted in the nursery of the Natural Resources Department/ Forest Science Section, in Lageado Experimental Farm, belonging to the Faculdade de Ciências Agronômicas (FCA) of UNESP, localized in Botucatu - SP. The studied species were: Eucalyptus grandis Hill. Ex. Maiden (in winter and summer periods), Eucalyptus urophylla S.T. Blake (in summer periods) and the hybrid Eucalyptus grandis vs. Eucalyptus urophylla (Eucalyptus urograndis) (in summer periods). It was used the commercial product Mec Plant® - Forest 3 as growing medium. The experiment was completely randomized compounded by 4 treatments, characterized by the frequencies of fertilizations, being T1 to T4 respectively, seedlings fertirrigated weekly, two times in the week, three times in the week and daily. The treatments were made by 5 repetitions of 48 plants each, being 24 and 12 centers, respectively, for the experiment of winter and summer, considered useful for the evaluations. The seedlings were evaluated as: aerial part height (H); diameter of collect (DC); aerial part dry mass matter (MSA), roots dry mass matter (MSR) and total dry mass matter (MST); roots structuring; transpiration; tenor and accumulation of macro and micro nutrients of aerial and root parts. It was concluded that the more frequent fertilization, consequently, more dilute solution, provided a better development and seedlings quality, although the superior transpiration for this treatment. For the summer period, the hybrid E. urograndis did not have is quality and development influenced by the fractionating of the fertilization. For E. grandis and E. urophylla species the... (Complete abstract click electronic access below)

Master of Science / Department of Animal Sciences and Industry / Joel M. DeRouchey / Five experiments using a total of 4,470 pigs were used to determine the effects of dietary Cu and Zn source and finishing pig space allowance. Experiment 1 evaluated increasing dietary Zn from Zn hydroxychloride or ZnSO₄ for finishing pigs. Increasing dietary Zn up to 100 mg/kg Zn maximized ADG and HCW with the greatest response observed during the last 37 d period when ractopamine was included in the diet. Pigs fed diets with Zn hydroxychloride had greater HCW compared to those fed ZnSO₄. Experiment 2 evaluated increasing dietary Cu from either CuSO₄ or a 50:50 blend of CuSO₄:Cu-AA for finishing pigs. Pigs fed Cu from CuSO₄ alone consumed more feed and tended to have poorer feed efficiency than those fed a 50:50 blend of Cu from CuSO4:Cu-AA. Pigs fed a 50:50 blend of CuSO4:Cu-AA had improved HCW G:F but ADG was unchanged on a live and HCW basis. Experiments 3 and 4 evaluated increasing dietary Cu from tri-basic copper chloride or a Cu-chelate for nursery pigs. In Exp. 3, increasing Cu from Cu-chelate to 150 mg/kg Cu increased ADG and ending BW. Increasing Cu to 150 mg/kg Cu increased ADFI and improved G:F. Pigs fed Cu from Cu-chelate had greater ADG, ADFI and ending BW than those fed Cu from tri-basic copper chloride. In Exp. 4, increasing Cu to 225 mg/kg Cu increased ADG and ending BW. Because ADFI was unchanged, G:F tended to be improved as Cu level increased. There were no differences detected between Cu sources for growth performance. Experiment 5 was conducted to determine the effects of increasing space allowance by pig removal or gate adjustment during the finishing period. Pigs provided 0.91 m² had increased ADG compared with those allowed 0.63 m² with pigs from pens provided increased space intermediate. Pigs provided 0.91 m² had increased ADFI compared with pigs allowed 0.63 m² and those where a pig was removed; however, pigs from pens where the gate was adjusted were intermediate. As pigs grew to the minimum predicted space requirement and were subsequently allowed more space, performance was greater than those initially provided 0.61 m² but less than those allowed 0.91 m².

No abstract available. / Dissertation (MInstAgrar)--University of Pretoria, 2011. / Microbiology and Plant Pathology / unrestricted