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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"fertilization rate"”.
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Interactive effects of n fertilization rate, cultivars and planting date under climate change on maize (zea mays l.) yield using crop simulation and statistical downscaling of climate models
… (CC) and variability (CV) on PD, N fertilizer rate (N), cultivar, maize growth, and yield is not well documented in Zambia. The impact of climate change and extreme climate indices on maize yield in AERII are carried out at large spatial scales, missing out on local-scale impacts, mitigation …
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Lowered reproduction efficiency as a correlated response to selection for increased post-weaning gain in laboratory mice
… were charted by vaginal smears and plugging rate, litter rate, and litter sizes recorded; (2) Ovulation rate was obtained by counting CL's at 3½ and 7 days after mating; (3) Fertilization rate was obtained at 3½ days after mating; (4) Pre- and early post-implantation losses were obtained at 7 …
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The economic and environmental implications of feedlot manure utilization in the Texas High Plains
… for each cropping activity, alternative fertilization rate, and soil types predominant in the THP. Expected crop yields, water requirements, and residual nitrogen and phosphorous levels were estimated with the Erosion-Productivity Impact Calculator (EPIC) biological crop/growth simulation …
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Oxytocin-induced cervical dilation in sheep: mechanism of action and potential use for nonsurgical artificial insemination
… movement of sperm to the oviducts (Exp. 3) or fertilization rate (Exp. 9). Oxytocin probably binds to uterine and cervical receptors (Exp. 6) and stimulates uterine tetany (Exp. 2) and prostaglandin release (Exp. 5). Because of the irregular arrangement of smooth muscle in the sheep cervix …
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Nutrition and Plant Growth Regulator Rates for High Quality Growth of Containerized Spiderwort (Tradescantia virginiana L.)
… purpose was to determine fertilizer and PGR rates for high quality growth of Spiderwort in a greenhouse production setting. The first experiment screened three plant growth regulators (PGRs) at ascending rates on three T. virginiana cultivars. The most effective rates for height suppression …
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Nitrogen Rate and Source Effects on Biomass Yield of Teff Grown for Livestock Feed in the Mid-Atlantic Region
… and 2010 to determine the effect of nitrogen (N) fertilization rate and source on the yield, nutritive value, and nitrate content of teff. Nitrogen (N) was applied at 0, 45, 90, and 135 kg plant available N ha-1 as a single application of either ammonium nitrate (AN) or broiler litter (BL) at …
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Long-term storage of liquid boar spermatozoa
… properties of boar spermatozoa important to fertilization. The least-squares means for the percentage of normal apical ridge acrosomes were significantly affected by ejaculate within boar (P< .001), boar x extender (P< .05), boar x storage temperature (P< .01), extender x storage temperature …
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Effect of different culture media and incubation methods on culturing murine embryos in vitro using a semen straw as an alternative receptacle
… design and the student t-test was used to separate the mean and they showed that there was no statistica! difference (p > 0.05) between the media, receptacles and incubators. The overall fertilization rate was 94 % to 99 %. The semen straw with Ham's F10 incubated in the bi-gas incubator had …
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Analysis of Human Sperm Chromatin Integrity
… to overcome the motility barrier required for fertilization. Spermatozoa rendered immotile by cryodamage were directly microinjected into the perivitelline space of hamster oocytes in order to obtain fertilization and possible chromosomal development.</p> <p>The swim-up-selected spermatozoa …
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Reproductive Manipulation and Larval Rearing Techniques of Yellow Perch (Perca flavescens)
… of eggs from manipulated females was 26.5%. The fertilization rate was significantly greater among strip-spawned females than tank spawned females (p < 0.05). The time to ovulation after injection showed a negative correlation (r2 = 0.505) with the mean oocyte diameter of manipulated females. …
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The quantification and characterization of soil carbon pools in biofuel agriculture.
… carbon cycling. Agricultural land management strategies such as fertilization, tillage, and crop selection affect soil organic carbon (SOC) storage through the quantity and quality of soil organic matter (SOM) fractions. A small perturbation in the SOC pool due to climate or land use change has …
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In vitro maturation and fertilization of porcine oocytes and evaluation of male fertility
… for in vitro porcine maturation and for in vitro fertilization (IVF), and utilizing these in vitro matured oocytes and in vitro fertilization techniques to determine the difference of sperm fertility from different boars. In the study of in vitro oocyte maturation, the oocyte maturation process …
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Pre- and Postharvest Practices for Optimizing the Postharvest Quality of Cut Sunflower, Dahlia, and Delphinium
… Experiments investigated the effects of nitrogen fertilization rate on delphinium 'Guardian Mix' and the effects of deficit irrigation on delphinium 'Guardian Blue.' 'Guardian Mix' plants produced marketable cut stems at nitrogen rates as low as 50 mg/L. Deficit irrigation did not change vase …
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Impacts of Landscape Position and Nitrogen Fertilizer on Soils, Carbon and Nitrogen Leaching, and Greenhouse Gas Fluxes from Switchgrass Production in South Dakota
… were to (i) evaluate the impacts of nitrogen fertilization rate (N rate) and landscape position on soil pH, soil organic carbon (SOC), total nitrogen (TN), bulk density (ρb), and phosphorus (P) in switchgrass field; (ii) assess the impacts of the N rate and landscape position on dissolved …
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Soil nitrogen pools, forms, and losses in mature miscanthus x giganteus under nitrogen fertilization treatments
Miscanthus x giganteus is temperate climate dedicated energy crop with high biomass yield potential cultivated in the United States and Europe. Previous studies in young stands of Miscanthus x giganteus have shown little effect of nitrogen (N) fertilizer on yield production but have shown increased …
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Nitrogen Management in No-till Winter Wheat Production Systems
Determining optimum N fertilization rate and timing is critical to improve yields and economic sustainability for no-till winter wheat (Triticum aestivum L.) in the Virginia Coastal Plain. Little data are available evaluating N management strategies, optimum N rate prediction methods, or potential …
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Διέγερση των ωοθηκών σε γυναίκες για εξωσωματική γονιμοποίηση και ενδοσαλπιγγική μεταφορά γαμετών
… is usually low. Also, the success of in vitro fertilization-embryo transfer (IVF/ET) is greatly enhanced by the number of oocytes retrieved. Therefore, most IVF centres use various ovarian stimulation protocols in order to maximize the development of multiple oocytes in a given cycle, thus …
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Genetic parameters and genomic analysis of semen quality and fertility traits in pigs
… pig production. Because of the low to moderate heritabilities for these traits, it is important to identify all factors influencing them and to include these factors in the genetic evaluation models. The service sire (boar which ejaculate dose was used to inseminate the sow) and ejaculate …
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Characterization of pregnancy-associated glycoproteins and progesterone as a predictor of twins and conceptus loss in high-risk pregnancy Holstein cows
… in dairy operations. Despite the high oocyte fertilization rate in dairy cows, only 28 % of those maintain a pregnancy to term. Pregnancy loss is estimated to cost U$600.00 per case. Identification of cows losing the pregnancy as early as possible can be helpful in providing timely …
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Quantifying Crop Yield, Bioenergy Production And Greenhouse Gas Emissions From Cropland And Marginal Land Using A Model-Data Fusion Approach
… Model for these ecosystems. The model incorporated biogeochemical and ecophysiological processes including crop phenology, biomass allocation, nitrification and denitrification as well as agronomic management of irrigation and fertilization. It was used to estimate crop yield, biomass, net …
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