Global ETD Search
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 90 for “"egg laying"”.
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Genetic and behavioral studies of the egg-laying system in Caenorhabditis elegans
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1983.
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Energy Requirements for Egg-Laying and Incubation in the Zebra Finch, Poephila Guttata
Made available in DSpace on 2014-12-10T18:13:25Z (GMT). No. of bitstreams: 1 6511776.pdf: 1589202 bytes, checksum: 7b4a9444612637fe6ff185f12f291945 (MD5) Previous issue date: 1965
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Correlation Between the Egg Laying Ability of Pullets and Certain Hormonally Controlled Characteristics of Their Full Brothers
Made available in DSpace on 2014-12-05T17:47:19Z (GMT). No. of bitstreams: 1 0009119.pdf: 3621882 bytes, checksum: 0d06ae65e49a0affd5769d62b7572f6b (MD5) Previous issue date: 1952
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Long-term effects of insecticides on environmental health: How does exposure of a female egg-laying insect to an insecticide affect subsequent generations?
… pyrethroid and neonicotinoid insecticides in an egg-laying butterfly; not only to her directly, but also the offspring’s development, survival, and host plant detection ability. In Bicyclus anynana (a popular butterfly model system), we have shown that LC50 doses varied greatly depending on the …
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Eggs, incubation and hatching asynchrony in gulls
… the effect of incubation behaviour during egg-laying and early incubation on hatching patterns due to difficulties to determine onset of incubation during egg-laying. I investigated whether incubation behaviour during egg-laying and early incubation affects hatching patterns in gulls using …
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Regulation of C. elegans behavior and physiology by the hypoxia-response pathway
… discovered the egl-9 gene from studies of egg-laying behavior. egl-9 loss-of-function mutants, in which HIF is constitutively active, are egg-laying defective; the mechanism regulating egg laying downstream of HIF has been unknown. From a screen for suppressors of the egl-9(lf) egg-laying …
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Toxic effects of dietary methylmercury on immune system structure, function, and development in the American kestrel (Falco sparverius)
… male kestrels, female kestrels during egg laying, and nestling kestrels. Immunological endpoints included cell-mediated immunity (CMI) using the phytohemagglutinin (PHA) skin-swelling assay and antibody-mediated immune function using the sheep red blood cell (SRBC) hemagglutination …
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Issues in the Care of Farm Animals: Current History of the Movement in Selected States
… crates for veal calves, and battery cages for egg-laying hens are being banned in some states in the United States. While appearing to be a modern phenomenon, animal rights/animal welfare issues actually can be found throughout history. The purpose of the study was to trace the history of the …
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The Effect of Selection on Egg Production in Single Comb White Leghorn Fowl
The practical value of any system of breeding for egg production must be demonstrated first to be appreciated by the average poultryman. High egg yield has been found by several workers to be due to the combined influences of early sexual maturity, non-winter pause, high intensity, non-broodiness …
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Drosophila Melanogaster Oviposition and Toxicity Studies on a Chip
Oviposition or egg-laying is an important behaviour used to assess the biological processes in Drosophila melanogaster. This behaviour is affected by physical and chemical properties of the substrate, which have not been investigated precisely and parametrically with existing manual approaches. …
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Characterization of Pituitary Protein Expression Patterns During Stages in the Reproductive Cycle of Turkey Hens
… The ability to maintain turkey hens in the egg-laying (LAY) stage and produce one additional egg per hen a year is estimated to save the turkey industry approximately $1.5 million dollars per year. Overall protein expression generated by tissues of the hypothalamic-hypophyseal complex, …
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Reproductive Resilience of Aedes Aegypti Mosquitoes
… hosts that provide blood proteins required for egg development, conspecific males that provide sperm required for fertilization, and freshwater in natural or manmade containers that serves as an egg-laying substrate suitable for offspring survival during larval and pupal stages. As global …
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The role of the C. elegans transcription factor LIN-11 in cell fate specification
… for a lin-11 mutation are rarely able to lay eggs, suggesting that there are other defects in the egg-laying apparatus in addition to the vulval precursor cells.</p> <p>To ensure that the ablated animals did not form a functional vulva and fail to lay eggs due to defects in the neurons …
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Microfluidic Devices for Neural and Behavioral Screening of C.Elegans using Electric Field
… on-demand EF-evoked behaviour, termed electric egg-laying, in a simple to use microfluidic device that enabled trapping and exposure of individual worms to controlled EF conditions. Interestingly, we found that egg-laying is EF polarity dependent with a significant increase in the egg-count for …
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Analysis and suppression of mutant sel-12 in Caenorhabditis elegans
… in C. elegans leads to a highly penetrant egg-laying defect (Egl) which resembles the Egl defect present in lin-12 hypomorphic alleles. The inability of sel-12 mutant animals to lay eggs is shown here to be caused by two defects: (i) a cell specification defect which results in a blockage …
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The breeding biology and ecology of the White-necked Picathartes <i>Picathartes gymnocephalus</i> temminck 1825, in Sierra Leone
… passerines. In most cases, one clutch of two eggs was laid between June and December, immediately followed by moult between January and May (the dry season). Peaks in egg laying occurred 1-2 months after the maximum monthly rainfall. Both parents cared for the young and fed nestlings …
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Nesting Ecology Of Red-Headed Woodpeckers (Melanerpes Erythrocephalus) In Central Minnesota
… candidate models. Of nests found during the egg laying stage, 100% experienced some amount of brood reduction. On average, nest contents were reduced by 48.1% between egg laying and fledging with reduction occurring at all points in the nesting cycle. I documented the ages at which nestlings …
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The effects of dietary probiotic inclusion on skeletal health of poultry and its possible mechanisms
… of probiotic supplementation on bone health of egg-laying and meat-type chickens. Dietary supplementation of a multi-species based probiotic reduced the percentage of shell-less eggs beginning at 4 wk following treatment and increased tibial and femoral bone mineral density in egg-laying hens at …
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Breeding behavior of captive emperor penguins (Aptenodytes forsteri)
… April 1981. Emphasis was on displays, courtship, egg-laying, incubation, and care of chicks.</p> <p>I observed the trumpet display most often between birds of opposite sexes and I interpret it as a signal of sexual identity. I interpreted the sideways stare display as a signal of sexual identity …
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Ecological Relationships of Breeding Blue-winged Teal to Prairie Potholes
… congregated on larger wetlands. With onset of egg-laying, pairs dispersed into ponds throughout the wetland complex to establish breeding home ranges. Other factors that influenced changes in habitat use included: 1) pond type and size, 2) availability of wet ponds, 3) breeding cycle phenology, …
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