Showing papers in "Domestic Animal Endocrinology in 2005"

TL;DR: The results suggest that leptin could be a link between nutritional history and physiological regulations, which integrates the animal's requirements, predictable food availability and potential for survival, and how husbandry strategies could integrate the adaptative capacities of ruminants to their environment.

TL;DR: Mechanisms through which undernutrition hypersensitize the hypothalamic-gonadotropic axis to leptin may involve up-regulation of the LR; however, an increase in LR mRNA expression is not a requisite feature of heightened adenohypophyseal responses in fasted cattle.

TL;DR: It has been indicated that suckling or milking activates a vagal reflex, which may link the milk production to the endocrine system of the GI-tract, which has been raised whether the mammary gland is a supporting or consuming organ.

TL;DR: Dietary supplementation of oligosaccharides such as COS and GMOS may improve growth and feed conversion efficiency by increasing plasma GH and IGF-I levels, in the early-weaned piglets.

TL;DR: It is shown for the first time that an acute increase in luteal BF occurs in the peripheral vasculature of the mature CL together with increases in eNOS expression and ET-1 and Ang II secretion in the CL during the early stages of luteolysis in the cow.

TL;DR: Important steps of ovarian regulation during follicle development, ovulation and the life span of corpus luteum (CL) in ruminants are highlighted to highlight the importance of growth factors especially of insulin-like growth factor, vascular endothelial growth factor and fibroblast growth factor for development and completion of a dense network of capillaries during follicles growth and CL formation.

TL;DR: The TR-FIA was sensitive, accurate, and precise for all three species of fishes, and provided a low-cost, and non-radioisotopic method for quantifying plasma IGF-I levels in fed and fasted channel catfish.

TL;DR: FSH appears to be involved in the maintenance of a pool of medium follicles that can be selected by LH to mature and ovulate, and suppression of FSH for 3 days or unilateral ovariectomy after 3 days of the follicular phase prevents full ovulatory compensation.

TL;DR: It can be concluded that the tissue and time dependent regulation of the balance between TH activating and inactivating enzymes plays an essential role in the control of local T3 availability and hence in TH activity.

TL;DR: The changes in basal steroidogenesis and in responses to gonadotropins suggest that follicular cells begin to luteinize at elevated temperatures in vitro, which may be responsible for the reduced fertility of dairy cattle under heat-stressed conditions.

TL;DR: Data indicate that feeding cortisol for 4 weeks reduces weight gain, feed intake, and plasma levels of IGF-I and induces a approximately 20-kDa IGFBP.

TL;DR: The non-tumorous form of primaryhyperaldosteronism in cats has many similarities with "idiopathic" primary hyperaldoster onism in humans, which may in part be due to the often incompletely suppressed plasma renin activity.

TL;DR: While the majority of data relate to the pituitary, ovary, uterus/placenta and testis, consideration is also given to emerging roles in inflammatory processes and in non-reproductive tissues or systems.

TL;DR: Satotropin, responsible for maintenance of lactation in ruminants, has been shown to positively influence innate immunity and a more rapid recovery in milk production of severely affected animals and PRL, concomitantly known as a lactogenic hormone and an immunoregulatory cytokine, has also been associated with modulation of the immune system.

TL;DR: In this paper, the authors found that reproduction in female pigs is resistant to the effects of acute or repeated acute stress or acute and repeated acute elevation of cortisol even if these occur during the series of endocrine events that induce estrus and ovulation.

TL;DR: Although the results identify leptin as a putative signal that links metabolic status and neuroendocrine control of reproduction, other adipocyte protein products may play an important role in regulating the reproductive axis in the pig.

TL;DR: It is found that a disturbed milk ejection is due to a reduced release or complete absence of oxytocin from the pituitary, and severity of disturbed milk ejectedion and coping capacity towards novel milking environment was inversely related to the cortisol release in response to ACTH.

TL;DR: This study was performed to get insight into the function of leptin during the periparturient period and to perform an association study between polymorphisms in the bovine leptin gene and leptin receptor gene and fertility as well as production traits.

TL;DR: The above findings indicate that TNFalpha and NO play crucial roles in functional and structural luteolysis in cattle.

TL;DR: Based on the results tissues participating in production have an autoregulative mechanism through which tissues can be relatively independent of the plasma leptin levels in order to maintain the desired function.

TL;DR: There is now increasing evidence that the physiological role of the mammalian UCP3 and UCP2 is rather related to lipid oxidation and/or prevention of reactive oxygen species accumulation than to heat production by uncoupling.

TL;DR: The combination of severe dexamethasone-resistant pituitary-resistant hyperadrenocorticism with elevated circulating ACTH levels, and an abdominal neuroendocrine tumor allowed the diagnosis of ectopic ACTH secretion.

TL;DR: The intention of this paper is to review current knowledge concerning the endocrine aspects of normal and stress-influenced ovarian function in pigs.

TL;DR: No differences were observed between both species for the seasonal pattern of prolactin secretion and mean amplitude of melatonin, and wide differences in reproductive patterns between wild and domestic types of rams do not appear to be attributed to seasonal changes in Prolactin and melatonin.

TL;DR: No significant difference was found in phagocytosis, oxidative burst and circulating lymphocyte subsets at anestrus and at either phase of the estrous cycle, suggesting that the immune status of the mare was not influenced by the seasonal changes in ovarian activity.

TL;DR: The results demonstrate favorable effects of PC on regulatory cytokines relative to inflammatory cytokines that might contribute to reduction of intestinal inflammation.

TL;DR: GHRH is an effective inducer of GH release in growing calves, and the relative importance of ghrelin in contributing to the rise in plasma GH increases in early lactating cows is suggested.

TL;DR: Data demonstrate that embryonic EDC exposure interferes with sexual differentiation of neural systems that direct reproduction in quail, and differential sensitivity to EDCs exists across species.

TL;DR: This is the first report showing the cellular site of oestrogen biosynthesis not only in the testis but also in the epididymis and prostate of sexually mature stallion and a single, adult cryptorchid.

TL;DR: The results indicated that IGF-I effectively maintained the survival of oocytes and promoted their growth and the supplementation of IGF-1 and EGF to the culture medium is recommended in the culture of goat preantral follicles.