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Modeling Resource Use Responses to Macroeconomic Changes: Water in the US Southern Great Plains

Natural Resources 2013年第1期4卷 8-19页

作者： Justin Weinheimer erin wheeler-cook Don Ethridge Darren Hudson Department of Agricultural and Applied Economics Texas Tech University Lubbock USA

This study addressed the impacts of the 2008 US recession on water extraction rates from the Ogallala Aquifer in the Southern High Plains of Texas by examining the differences in projected macroeconomic variables and how they impact agricultural production and irrigation water use. The approach used pre- and post-recession FAPRI-based projections of commodity markets and an economic optimization model formulated for the Ogallala Aquifer to simulate water use adjustments. Results indicate that, based on the projections used, the 2008 recession decreased, then increased water use slightly in the representative counties, ceteris paribus, with minimal cumulative effect, and water use responsiveness to economic forces within the region was variable. This analysis also demonstrates that relating policy and economic changes to resource use changes is possible.

关键词： Macroeconomic Impacts Ogallala Aquifer Optimization Recession

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Preliminary Study of Effects of Centrifugation of Stallion Semen on Motility and Pro-AKAP4 Concentration over 72 Hours Post-collection

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Journal of Agricultural Science and Technology(A) 2022年第2期12卷 65-72页

作者： Mikaila Zi Yue Smith Anna Dilger erin Bryan Giana Bytnar Suhna Choi Kelly cook Kevin Kline Department of Animal Sciences University of Illinois at Urbana Champaign1207 West Gregory DriveUrbanaIL 61801USA

The study aimed to investigate the effects of centrifugation of stallion semen on progressive sperm motility over a 72-hour period;and determine if the protein marker,precursor of A-kinase anchor protein 4(pro-AKAP4),may be maintained at a higher level over time when compared to non-centrifuged ***-AKAP4 has been studied for its function in stabilizing the structure of spermatozoa and its use as a marker for fertilizing capacity of *** collections were obtained from four fertile,commercially used Standardbred stallions collected three times *** samples were diluted to a final concentration of 50 million total cells per *** extended aliquot of semen from each collection was used for the non-centrifuged treatment,and one extended aliquot of semen was centrifuged at 750×g for 10 *** supernatant from the centrifuged sample was then removed with a 10 mL plastic transfer pipette,and the spermatozoa cell pellet was suspended in fresh extender to a final concentration of 50 million total cells per *** centrifuged and non-centrifuged samples from each collection were stored in Equine Express II stallion semen shipping containers for 72 h and fresh ice packs were added to each container every 24 *** progressive sperm motility and levels of pro-AKAP4 were determined at times 0,12,24,48 and 72 h after *** were found between stallions,times and treatments with the main finding being that pro-AKAP4 concentration in centrifuged samples was maintained at a much higher level over the 72-hour period studied.

关键词： Centrifuged extender pro-AKAP4 spermatozoa stallion.

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