Development of the mammary gland

Knight, Chris; Peaker, M.

doi:10.1530/jrf.0.0650521

Cited by 139 publications

(77 citation statements)

References 54 publications

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“…Essas mudanças começam durante a vida fetal e continuam até que a glândula atinja a maturidade, mediante ação de ondas hormonais durante os sucessivos ciclos reprodutivos. 10 O tecido mamário continua a crescer após o parto e alcança o máximo crescimento durante o pico de lactação, sofrendo regressão após esse período. A quantidade de secreção de leite depende do crescimento do tecido epitelial túbulo-alveolar da glândula mamária, processo que está sob controle hormonal.…”

Section: Introductionunclassified

Glândula mamária do mocó (Kerodon rupestris - Wied Neuwied, 1820): aspectos morfológicos

Lima

Bonatelli

Oliveira³

et al. 2008

Braz. J. Vet. Res. Anim. Sci.

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ResumoProcurando colaborar com a exploração zootécnica racional dos mocós (Kerodon rupestris) foi descrita a morfologia da glândula mamária destes roedores, que por sua vez podem tornar-se uma fonte de alimento para população nordestina. Foram utilizados cinco animais cedidos pelo Centro de Multiplicação de Animais Silvestres (CEMAS) da pela Escola Superior de Agricultura de Mossoró (ESAM) registrado junto ao IBAMA como criadouro científico sob o número 12.492-0004. As glândulas mamárias foram retiradas através de dissecação e foram fotografadas. Cada animal apresentou duas glândulas mamárias localizadas na região inguinal. Histologicamente a glândula mamária era composta por uma grande quantidade de lóbulos, repletos de glândulas túbulos-alveolares com epitélio simples cúbico. Na papila mamária fibras musculares apresentaram-se dispostas de modo circular, o que possivelmente auxilia na contração para excreção do leite. Palavras-Chave:Mocó. Kerodon rupestris. Glândula mamária. IntroduçãoA problemática em torno da biodiversidade do planeta tem levado pesquisadores a desenvolver trabalhos no campo da ecologia animal, abordando aspectos de interesses ecológicos a fim de preservar àquelas espécies ameaçadas de extinção. Dentro deste contexto, os animais silvestres diferem daqueles domesticados pelo homem, que vem modificando de forma gradativa e progressiva o comportamento, a fisiologia, a anatomia e as características genéticas. A biologia comportamental, a fisiologia e a anatomia têm assumido papéis de elevada importância, uma vez que, propiciam formas de conhecimentos que permitem ao homem entender como interagem determinados grupos de animais em ambiente natural ou mesmo em regime de cativeiro.Estes estudos muitas vezes levam em consideração caracteres reprodutivos, alimentares, ritmos biológicos, comportamento social, características fisiológicas e morfológicas que, na grande maioria das vezes, são realizados em função da importância ecológica que a espécie apresenta. Neste último caso enquadram-se os roedores, como as cutias, as capivaras, as pacas e em especial os mocós, dado aos maiores riscos de extinção que a espécie tem apresentado.Os roedores são animais que oferecem extraordinária variedade de adaptações ecológicas, suportando os mais variados tipos de climas e altitudes, podendo manifestar diversas formas de adaptações

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Section: Introductionunclassified

Glândula mamária do mocó (Kerodon rupestris - Wied Neuwied, 1820): aspectos morfológicos

Lima

Bonatelli

Oliveira³

et al. 2008

Braz. J. Vet. Res. Anim. Sci.

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“…Although the majority of mammary gland growth and structural development occurs during pregnancy, the degree to which this process is complete at the time of parturition varies substantially among species (Cowie et al, 1980;Knight and Peaker, 1982). The observed increase in alveolar size between early and peak lactation in multiparous grey seal females (Table3) indicates that alveolar development is not complete at parturition and that it continues at least over the early part of lactation in multiparous grey seals.…”

Section: Discussionmentioning

confidence: 99%

“…Prior to first conception, the mammary gland consists of a system of ducts branching through the mammary fat pad with no true secretory tissue present (Cowie et al, 1980;Knight and Peaker, 1982). Following first conception, there is an increase in ductal growth and a rapid proliferation of secretory cells to form the first lobulo-alveolar tissues (Knight and Peaker, 1982).…”

Section: Introductionmentioning

confidence: 99%

“…Following first conception, there is an increase in ductal growth and a rapid proliferation of secretory cells to form the first lobulo-alveolar tissues (Knight and Peaker, 1982). This massive proliferation of cells continues throughout gestation and, in some species, into the initial stages of lactation (Knight and Peaker, 1982). Immediately prior to parturition, mammary epithelial cells are converted from a non-secretory to a secretory state, with a gradual increase in the secretory activity of these cells occurring through the early stages of lactation up until peak lactation (Knight and Peaker, 1984;Shipman et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

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Primiparous and multiparous females differ in mammary gland alveolar development: implications for milk production

Lang

Iverson

Bowen

2012

Journal of Experimental Biology

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SUMMARYMammary gland capacity is influenced by the number of secretory cells in the gland, the activity of those cells and the size and arrangement of the alveoli that they form. Although reproductive experience has been shown to affect the total number of secretory cells in the gland, its potential effect on the structural development of lobulo-alveolar tissues has not been directly investigated. To examine whether reproductive experience affects lobulo-alveolar development, we took mammary gland biopsies at early and peak lactation from primiparous and multiparous grey seal (Halichoerus grypus) females and used histological techniques to compare cell density, alveolar density and alveolar size within secretory lobules. Primiparous females had a significantly higher cell density compared with multiparous females throughout lactation, suggesting that primiparous females have smaller, less-developed secretory cells. Primiparous females had a significantly smaller average alveolar size compared with multiparous females throughout lactation. Although alveolar density was higher in primiparous females compared with multiparous females at early lactation, there was no significant difference between the groups at peak lactation. These results suggest that the mammary gland of primiparous females may have both a lower secretory capacity and a lower storage capacity on a relative basis than those of multiparous females and demonstrate, for the first time, that reproductive experience has a significant effect on both the rate and pattern of mammary gland alveolar development and, potentially, on a femaleʼs capacity for milk production.

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“…The wide-ranging functions of prolactin (McNeiUy, 1980;Knight & Peaker, 1982;McNeiUy et al, 1982;Bartlet, 1985;Gromdzka-Ostrowska et al, 1985) makes the interpretation of the sig¬ nificance of elevated prolactin values during winter difficult, although prolactin is implicated in induced ovulation (Saboureau & Castaing, 1985) in hedgehogs. Correlations between prolactin and photoperiod and ambient temperature suggest that prolactin is involved in the environmental regulation of metabolic and reproductive cycles of the hedgehog.…”

Section: Discussionmentioning

confidence: 99%

Seasonal endocrine cycles in the European hedgehog, Erinaceus europaeus

Fowler

1988

Reproduction

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Development of the mammary gland

Abstract: IntroductionThe first obvious statement is that the mammary gland is an intriguing structure, and that its development is one of the most fascinating aspects. During the lifetime of the animal the mammary gland probably undergoes more and greater changes in size, structure

Cited by 139 publications

References 54 publications

Glândula mamária do mocó (Kerodon rupestris - Wied Neuwied, 1820): aspectos morfológicos

Glândula mamária do mocó (Kerodon rupestris - Wied Neuwied, 1820): aspectos morfológicos

Primiparous and multiparous females differ in mammary gland alveolar development: implications for milk production

Seasonal endocrine cycles in the European hedgehog, Erinaceus europaeus

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