Banca de DEFESA: MAYRA DIAS SILVEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MAYRA DIAS SILVEIRA
DATA : 30/08/2019
HORA: 09:00
LOCAL: Sala 01 - PQ
TÍTULO:

Behavioral Evaluation of Water Intake and Neuroendocrine Mechanisms Involved in Hydroelectrolytic Balance Control in Japanese Quails (Coturnix coturnix japonica).

PALAVRAS-CHAVES:

Ingestive Behavior, Osmoregulation, Neuroendocrine Control

PÁGINAS: 42
GRANDE ÁREA: Ciências Biológicas
ÁREA: Fisiologia
SUBÁREA: Fisiologia Geral
RESUMO:

The decrease of the body fluids can be caused by water deprivation and, therefore, control and regulation mechanisms are activated in order to ensure the maintenance of hydroelectrolytic balance, among them the secretion of neurohypophyseal hormones. Water deprivation in birds is an important stress stimulus that causes an increase in the activity of NPV and NSO neurons, called magnocellular cells, and consequently an increase in water intake behavior in birds. Thus, water deprivation becomes a convenient experimental model for studies of vasotocinergic and mesotocinergic activity, as well as studies of the interaction of these peptides with their respective receptors and their central and systemic action. Thus, the present study investigated the possible correlations between vasotocinergic and mesotocinergic activity in birds with behavioral changes between thirst mechanism and water intake, through an experimental model developed with Japanese quails (Coturnix coturnix japonica), submitting the experimental groups an water deprivation. Male quails of approximately 50 days were used, maintained at a controlled temperature of 26 ± 2ºC, under a photoperiod of 12/12 hours, subdivided into 3 distinct groups (n = 6): Control Group (CTRL), Water Deprivation for 36 hours (PvH) and Water Deprivation for 36 hours with 2 hours of water presentation (IH-2h). We found that water deprivation was able to increase the water intake of the IH-2h group for all observed time intervals when compared to the CTRL group and the IH-2 group before deprivation (IH-2h after deprivation vs CTRL, p IH-2h after deprivation vs IH-2h before deprivation, p <0.0001). The PvH group showed a statistically significant difference when compared to the CTRL group in basal water intake at 120 minutes (PvH 3.56 ± 3.32 vs CTRL 0.79 ± 0.70; p = 0.002). There was a significant reduction in body weight in the PvH and IH-2h groups when considering the variation in weight gain before and after deprivation (PvH after deprivation vs CTRL, p <0.0001 and IH-2h after deprivation vs CTRL, p <0.0001). Thus, the present study was able to demonstrate positive results regarding water ingestive behavior and its possible influences on species body weight gain after water deprivation. Although the results of the plasma parameters evaluated in this study do not allow us to confirm that the vasotocinergic and mesotocinergic neuroendocrine control mechanisms are involved in water deprivation, but we suggest that the action of the hormones AVT and MT is extremely important in the body fluids control. Further studies are needed to elucidate the role of these and other hormones involved in the osmoregulation of Japanese quails.

MEMBROS DA BANCA:
Interno - 387295 - LUIS CARLOS REIS
Externo à Instituição - PEDRO LEONARDO CEDRAZ MERCEZ - UES
Interno - 386960 - WELLINGTON DA SILVA CORTES