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Rück- und Anbildung der Milchdrüse bei Ziegen. Histologisch-Histochemische Untersuchungen nach einer Melkzeit von 8-10 Monaten


Geyer, H; Augsburger, H (1991). Rück- und Anbildung der Milchdrüse bei Ziegen. Histologisch-Histochemische Untersuchungen nach einer Melkzeit von 8-10 Monaten. Schweizer Archiv für Tierheilkunde, 133(5):229-242.

Abstract

7 chamois-coloured mountain goats were used to investigate histologically and histochemically the processes of involution and redevelopment of the mammary gland after a lactation period of 8 to 10 months. Tissue specimens were obtained by incision biopsy at drying-off two months prepartum and afterwards in intervals of 8-16 days up to parturition. The findings of this investigation were compared with results of two former investigations, in which involution and proliferation of the gland were studied separately, thus precluding an overlapping of the two processes. At drying-off, after an 8 to 10 month-lactation, sections indicative of active lactation occurred concomitantly with sections at various stages of involution, as well as early stages of redeveloping alveoli. At 16 days post drying-off, the sections indicating lactation at first examination were in a stage of maximum involution and transformation. Thus, the time required for involution was reduced by half compared to drying-off at peak lactation. At 32 days post drying-off, stages of proliferation predominated with only a few involuting glands. Specimens obtained thereafter contained only redeveloping glands. The histological and histochemical differentiation between areas of involution and those of proliferation may present difficulties during the mid-portion of the dry period. There appears to be an association between the length of the time interval from drying-off to parturition and the rate of tissue transformation in the caprine mammary gland; the rate is increased when the duration of the dry period is reduced.

Abstract

7 chamois-coloured mountain goats were used to investigate histologically and histochemically the processes of involution and redevelopment of the mammary gland after a lactation period of 8 to 10 months. Tissue specimens were obtained by incision biopsy at drying-off two months prepartum and afterwards in intervals of 8-16 days up to parturition. The findings of this investigation were compared with results of two former investigations, in which involution and proliferation of the gland were studied separately, thus precluding an overlapping of the two processes. At drying-off, after an 8 to 10 month-lactation, sections indicative of active lactation occurred concomitantly with sections at various stages of involution, as well as early stages of redeveloping alveoli. At 16 days post drying-off, the sections indicating lactation at first examination were in a stage of maximum involution and transformation. Thus, the time required for involution was reduced by half compared to drying-off at peak lactation. At 32 days post drying-off, stages of proliferation predominated with only a few involuting glands. Specimens obtained thereafter contained only redeveloping glands. The histological and histochemical differentiation between areas of involution and those of proliferation may present difficulties during the mid-portion of the dry period. There appears to be an association between the length of the time interval from drying-off to parturition and the rate of tissue transformation in the caprine mammary gland; the rate is increased when the duration of the dry period is reduced.

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Additional indexing

Other titles:Involution and redevelopment of the mammary gland in goats. Histological-histochemical studies after a lactation time of 8-10 months
Item Type:Journal Article, refereed, original work
Communities & Collections:05 Vetsuisse Faculty > Institute of Veterinary Anatomy
Dewey Decimal Classification:570 Life sciences; biology
Language:German
Date:1991
Deposited On:06 Oct 2015 11:56
Last Modified:08 Dec 2017 14:19
Publisher:Hans Huber
ISSN:0036-7281
PubMed ID:1896838

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