Plains viscacha were established in the laboratory to Spanish by Llanos & Crespo (), and some details of reproduction were given. Llanos, A. and J. Crespo. Ecología de la vizcacha (Lagostomus maximus maximus Blainv.) en el nordeste de la provincia de Entre Ríos. Rev. Llanos, A. C. and J. A. Crespo. Ecología de la vizcacha (Lagostomus maximus maximus Blainv.) en el nordeste de la Provincia de Entre Ríos. Revista de.

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Log In Sign Up. The viscachas were quickly sacrificed by intracardiac injection of Euthanyle 0.

IUCN Red List of Threatened Species

Acknowledgments The authors wish to vizcaca Mrs. Ivzcacha each section, 10 microscopic fields were randomly selected throughout the pineal gland. This index was calcula- ted with the availability in Plains. Regarding the number of pigment cells in each stage, females in mid pregnancy exhibited a higher number of pigmented cells, followed by females in late creso and early pregnancy.

This fact does not agree with the optimal foraging theory, and may reflect a forced selectivity induced by the low quality of available resources for vizcachas in La Payunia.

Each field contained between 90 and cells. We found that, although the expression of pituitary PRL increased steadily during pregnancy, its ovarian receptor PRLR reached its maximum in midpregnancy and drastically decreased at term pregnancy.

The objectives of this paper are to analyze the diet composition and habitat prefe- rences of vizcacha, and their changes in relation to food availability in a Northern Pata- gonia environment. Dietary preferences The association between diet and plant availability was significant for all the microhabitats, except for Huayquerfas Coloradas rocky elevations Table 2and the significance levels were generally higher for plains than for rocky elevations.


Canadian Journal of Biochemistry and Physiology. Androgen receptors expression in pituitary of male viscacha in relation to growth and reproductive cycle. Biological Series of the Organization of American States, pp. Revista Argentina de Producci6n Animal, 6: Vizzcacha brains were exposed, and the pineal gland was immediately crexpo and used for light and electron microscopy. Diet of the vizcacha Lagostomus maximus Rodentia, Chinchillidaehabitat preferences and food availability in Northern Patagonia, Argentina.

International Journal of Endocrinology

Melanin pigments in human pineal gland. Skip to main content.

Fundacion Miguel Lillo, edit. In dog [ 17 ], cat [ 18 ], sheep [ 1920 ], bat [ 16 ], and bovine [ 12 ], significant differences were not reported. Support Center Support Center. The broadening of vizcacha’s food niche when plant diversity increases could be explained as an adaptation to arid conditions Miller and Gaud Fernando Lange for their assistance during the anesthesia and surgical procedures; to Dr.

The perpendicular distance between the transect and each observed vizcachera was measured. Probable local modulatory action of melatonin. The groups were analysed using the Kruskal-Wallis test. Rocky elevations of La Payunia are the shelter of Lagidium viscacia. Sergio Ferraris and MVDr. A forced dietary selectivity was also detected in guanacos of La Payunia Puig et at.

The irregular distribu- tion of volcanic stone outcrops has been pointed out as a determinant factor of spatial differences in vegetation and soil characteristics Mendez ; Gonzalez Diaz Endocrinology and Metabolismvol.

Within the plains, Poa availability was significantly higher in Escoriales and lower in Huayquerfas Coloradas, while Zaino and Guadalosos showed the highest Pan i- cum availability Fig. PRLR immunoreactivity was weak at the beginning of pregnancy; it became markedly stronger at midgestation and decreased again near parturition time. Number of pigmented cells: Presence of melanin in the cat pineal gland. Omission of the primary antibody did not reveal any staining in all examined sections.


Differences in the amount of pigmented cells were found between pregnant and nonpregnant viscachas.

Gonzalez del Solar for his editorial suggestions. Author information Article notes Copyright and License information Disclaimer. La Payunia mosaic of plains and rocky elevations allowed to test this prefe- rence.

Some authors have indicated the presence of a few retinal antigens in the pinealocytes [ 40 — 43 ]. Enter the email address you signed up with and we’ll email you a reset link. Vzicacha of qPCR data showed a 4-fold rise when transitioning from early pregnancy to midpregnancy and a marked decline at the end of gestationper group Figure 2 a.

The CL synthesizes large amounts of progesterone P4which has an important role in the modulation of the estrous cycle and in the maintenance of pregnancy as well as an intermediary role in the synthesis vizcachs corticosteroids and androgens [ 1 — 3 ] for a review.

Maximum P4 and LH blood levels were recorded at midpregnancy as well. Intra- and interassay coefficients of variation were 7. GAPDH was used as housekeeping gene. In order to eliminate any emission crosstalk between the fluorophores, sequential line scanning lambda strobing mode was used when acquiring the images.