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Showing 1 to 20 of 212 for “"Hen"”.
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Comparative histology and histochemistry of the vascular system in the White Plymouth Rock hen and the pit fowl hen
… and iliac arteries, of 8 White Plymouth Rock hens and 8 pit fowl hens were examined histochemically. The purpose being to (1) determine whether arterial anatomical differences exist; (2) compare the vessels of both groups histochemically; (3) uncover differences in predisposition to …
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Adrenal control of blood calcium in the hen
Call number: LD2668 .T4 1943 T3
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Neuroendocrine regulation of broodiness in the domestic hen
Broodiness in the domestic hen is characterized by incubation of eggs and subsequent care of the young. Incubation behaviour is initiated by increased plasma progesterone and oestrogen from maturing ovarian follicles that induce nesting behaviour. This is subsequently transformed into incubation …
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Regulation of Estrogen Biosynthesis in the Domestic Hen
… during follicular maturation in the domestic hen. Theca and granulosa layers from the largest (F(,1)), second largest (F(,2)), and third largest (F(,3)) follicles were collected 24, 18, 12, 6 and 2 h before ovulation and isolated cells prepared. Five experiments were done: (1) characterization …
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Effects of Dieldrin on Reproduction of Penned Hen Pheasants
… the effects of dieldrin on reproduction of the hen pheasant were conducted for two breeding seasons, Hen pheasants were caged individually and administered encapsulated dieldrin at weekly intervals. The first season, treatment levels were 0, 2 or 4 mg of dieldrin per hen per week. Hens receiving …
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Systematic evaluation of laying hen exposure to atmospheric ammonia
… ammonia (NH3) concentrations in laying hen housing is a well-known challenge and recently has become the center of legislation for animal housing. In the winter months, poultry farm managers have to balance indoor temperature and environment (including atmospheric ammonia (NH3) …
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Movements and Habitat Use By Hen Pheasants During Brood Rearing
… and random field observations. Kozicky and Hendrickson (1951) carried out studies of the type of cover used by broods in Iowa. Hammer (1965) in Nebraska established random transects in various cover types to determine cover utilization by pheasant broods. Linde and Agee (1965) also studied …
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Study of the Neurogenic Mechanism of Lh Release in the Hen
Made available in DSpace on 2014-12-05T17:47:17Z (GMT). No. of bitstreams: 1 0006990.pdf: 3195562 bytes, checksum: d14f3d6280ee6b14894939d5e54533d6 (MD5) Previous issue date: 1953
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Evidence of Climatic Influence on Subsistence Strategies at Sage Hen Springs, Nevada
… Here, I present data collected from the Sage Hen Springs site in northwestern Nevada during a Phase II testing project conducted by the BLM and an analysis of these data focusing on patterns of subsistence and mobility strategies throughout the Archaic. Results of this analysis support …
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The Role of Gonadotropic Hormones in Follicular Maturation of the Domestic Hen
… development and ovulation in the domestic hen, Gallus domesticus. These investigations focused on a role for methylation in the regulation of adenlyly cyclase (AC) activity and progesterone (P) secretion in granulosa cells as well as the role of follicle-stimulating hormone (FSH) receptors …
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The Role(s) of Prostaglandins in The Reproductive Physiology of The Hen
Made available in DSpace on 2014-12-14T16:11:09Z (GMT). No. of bitstreams: 1 7624065.pdf: 2914966 bytes, checksum: a7e6f8e25d38f013afbfd50902a199fd (MD5) Previous issue date: 1976
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Comparative evolution of mipafox-induced delayed neuropathy in the rat and hen
… we chose to employ in our studies. Although the hen is the primary experimental model in the safety assessment of organophosphates, current research has suggested that the rat may have some validity as an experimental model. We examined the sequential neuropathic effects of a single dose of …
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Effects of Dieldrin on Reproduction of Penned Hen Pheasants in the Second Generation
<p>Effects of dieldrin on penned hen pheasants (Phasianus colchicus) which were the offspring of hens receiving encapsulated dieldrin the previous year were measured. Hens produced by the previous year's control group received 0, 6, 8, or 12 mg of dieldrin per week for 14 weeks. Hens from treated …
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Effects of Chick Stimuli and Dieldrin on Adoptive Behavior of Penned Hen Pheasants
… and dieldrin on adoptive behavior of penned hen pheasants were conducted in 1969 and 1970. Results indicated that whether caged hens saw or heard chicks had no effect on adoption or killing of chicks. Hens receiving sound stimuli and sight-and-sound stimuli from chicks responded similarly to …
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Improving aviary designs by observing laying hen locomotor development and determining navigational preferences
… activity patterns of four strains of laying hens in a complex three-dimensional system. Video observations of chicks (1-9 weeks of age) showed that chicks performed more locomotor events on the ground than on elevated surfaces and performed more locomotive and perching events on leveled …
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Regulation of Estradiol-17beta Synthesis by Small Follicles of the Domestic Hen Ovary
… are essential for successful reproduction of the hen because they are the source of follicles recruited into the hierarchy and the major source of estrogen. Estrogen is essential for yolk synthesis, egg shell formation, and other reproductive functions in the domestic hen. Although steroidogenesis …
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Regulation of ovarian progesterone biosynthesis by androgens and estrogen in the domestic hen
The hen lays eggs on successive days and then skips a day. The laying of these eggs, hence ovulation, occurs every 26 hour. The mechanism controlling this unique ovulatory cycle has not been defined. One level of control of this unique cycle resides in the ovary, specifically the ability of the …
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Histology and histochemistry of atherosclerotic lesions in the pit fowl hen vascular system
Iliac complexes from pit fowl hens, in 3 groups of 8 animals each having mean ages of 1.0, 2.5, and 4.4 years, were examined histologically and histochemically for spontaneous atherosclerotic plaques. The purpose being (1) clarification of the role of specific arterial components in elaboration of …
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