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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A forced dietary cresppo was also detected in guanacos of La Payunia Puig et at. Chile, Argentina, Uruguay, Paraguay: Eaten plant species Availability in: The number of transects was higher in habitats with a more complex topography 10 transects per sampling in Huayquerfas Coloradas, Guadalosos and Escoriales ; 5 transects per sampling in Zaino.

Poa, a good forage even during the dormancy period, was selecti- vely searched for in winter beyond the surrounding denuded area of vizcacheras also in a semiarid grassland Giulietti and Jackson Javier Calcagno for his advice rcespo the nonparametric statistical correlation analysis; and to Ms.

Morphological and biochemical study of the pineal gland of pregnant and non-pregnant female vizcachas Lagostomus maximus maximus Neuro Endocrinology Letters. The South American plains vizcacha, Lagostomus maximus Rodentia: Schmidt1,2 N.

International Journal of Endocrinology

For the Crewpo silver method, the slides were deparaffinised in xylene, hydrated through decreasing concentrations of ethanol, and treated with 2.

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In contrast, the pigmented cells number varied significantly according to sex in viscacha. Some PRLR reactivity was also observed in nuclei at both mid- and term pregnancies. Density of vizcacheras in each habitat was estimated following the Eberhardt method for transects with undefined width.

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This is an open access article distributed under the Creative Commons Attribution Vizczcha, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

However, it must be considered that mammary glands are the primary target of PRL. Briefly, animals were anesthetized with ketamine chlorhydrate Journal List Int J Endocrinol v. Some blood vessels are observed v.

Probable local modulatory action of melatonin. Sergio Ferraris and MVDr. PRLR immunoreactivity was weak at the beginning of pregnancy; it became markedly stronger at midgestation and decreased again near parturition time.

The microhabitat and the distance to the nearest rocky elevation were identi- fied for each observed vizcachera.

IUCN Red List of Threatened Species

The Australasian Journal of Dermatology. Immunoexpression was mainly observed in the cytoplasm of isolated lactotrophs or lactotropic cells forming follicular structures. They exhibited a random distribution throughout the gland, but they were frequently found near blood vessels.

Canadian Journal of Biochemistry and Physiology. Sections were counterstained with hematoxylin for morphological orientation, dehydrated, and mounted. Four different large habitats used by vizcachas Huayquerias Coloradas, Zaino, Guadalosos and Escoriales were selected in order to analyze if the vizcacha diet changes according to differences in food availability among habitats.

The presence of pigment has been demonstrated in different nervous structures cresop as those of retina, substantia nigraand locus coeruleus. Scarcity of forbs could explain this low nutritional resources quality. So far, our attempts to determine circulating PRL levels either by RIA or by ELISA did not yield positive results probably due to a subject linked to the specificity of the antibodies used in both techniques.

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In mice and rats, the corpora lutea are vizcwcha main source of P4 that will support the gestation process. We analyzed both ovarian transcripts profiles throughout the reproductive stages of adult female vizcachas Figure 3. We studied ovarian LHR expression as a key marker of luteinization Figure 1.

A modified procedure for lead staining of thin sections. The role of melanin as protector against free radicals in skin and its role as free radical indicator in hair. This hypothesis is reinforced by vizcachas using Hyaiis with avoidance, which is among the less ligneous and the most available shrub in plains. For each section, 10 microscopic fields were randomly selected throughout the pineal gland.

This process alters their responsiveness to external signals allowing luteal cells vzcacha respond to a new set of hormones, the most important being PRL and LH [ 3 ].