Mammary cell turnover: relevance to lactation persistency and dry period management

A.V. Capuco; E. Annen; A.C. Fitzgerald; S.E. Ellis; R.J. Collier

Mammary cell turnover: relevance to lactation persistency and dry period management

in Ruminant physiology

Autor:innen:

A.V. Capuco

A.V. Capuco ¹USDA-ARS, Bovine Functional Genomics Laboratory, Bldg 200, Beltsville Agricultural Research Center, Beltsville, MD 20705, USA

Search for other papers by A.V. Capuco in
Current site
Google Scholar
PubMed

E. Annen

E. Annen ²University of Arizona, Dept. of Animal Sciences, 217 Shantz Building, P.O. Box 210038, Tucson, AZ 85721, USA

Search for other papers by E. Annen in
Current site
Google Scholar
PubMed

A.C. Fitzgerald

A.C. Fitzgerald ²University of Arizona, Dept. of Animal Sciences, 217 Shantz Building, P.O. Box 210038, Tucson, AZ 85721, USA

Search for other papers by A.C. Fitzgerald in
Current site
Google Scholar
PubMed

S.E. Ellis

S.E. Ellis ³Clemson University, Animal and Veterinary Science Department, 124 Poole Agricultural Center, Clemson, SC 29634, USA

Search for other papers by S.E. Ellis in
Current site
Google Scholar
PubMed

, und

R.J. Collier

R.J. Collier ²University of Arizona, Dept. of Animal Sciences, 217 Shantz Building, P.O. Box 210038, Tucson, AZ 85721, USA

Search for other papers by R.J. Collier in
Current site
Google Scholar
PubMed

Art:: Kapitel

Seiten:: 336–387

DOI:: https://doi.org/10.3920/9789086865666_015

Über Institut einloggen

Sofortzugang erwerben (PDF-Download und unbegrenzter Online-Zugang):

42,00 €35,00 € excl. VAT

Add to Cart

Token einlösen

Milk production is a function of the number of mammary secretory cells and the activity per cell. Declining milk yield with advancing lactation is due to a decline in the number of secretory cells, although a decline in activity per cell occurs during late gestation. By replacing older cells with younger cells, cell turnover is a mechanism whereby persistency of lactation can be enhanced. Management practices such as bovine somatotropin (bST) supplementation, photoperiod manipulation and increased milking frequency may enhance lactation persistency. Mastitis, stressors, concomitant pregnancy, and decreased milking frequency may decrease persistency by increasing apoptosis. Mammary epithelial cells with lightly staining cytoplasm appear to be the progenitor cells responsible for proliferation within the mammary gland. Renewal of these cells and senescent secretory cells prior to the next lactation may be critical events responsible for the impact of dry period length on milk yield in the next lactation. Data indicate that there is extensive cell renewal in conjunction with net proliferation during the dry period. Although the 60-d dry period is the current management standard, continued advances in genetic potential and dairy management indicate that a reassessment is in order. Recent studies have shown that multiparous dairy cows treated with bST can be milked continuously without significant milk loss in the next lactation. Indeed, total milk yields (pre plus postpartum yields) were increased. However, lactating heifers require a dry period of sufficient length for optimal milk yield in the next lactation. Neither bST nor increased milking frequency reversed the negative impact of an inadequate dry period on milk production by dairy heifers. However, these studies have provided additional insights and areas for future investigation.

Zitierungsangaben

Save
Cite
Inhalt per Mail versenden

Link teilen

Sie können einen Link zu dieser Seite per E-Mail senden:
Inhalt per Mail versenden
oder den Link direkt kopieren:

https://brill.edhh.ma/abstract/book/9789086865666/BP000015.xml
Der Link wurde nicht kopiert. Ihr aktueller Browser unterstützt das Kopieren über diese Schaltfläche möglicherweise nicht.

Link wurde kopiert

Reduzieren
Erweitern
Nach oben

Ruminant physiology

Digestion, metabolism and impact of nutrition on gene expression, immunology and stress

ISBN:: 9789086865666

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 24 Oct 2006

Fachgebiete
- Biowissenschaften
  - Allgemein
  - Tiere und Veterinärmedizin

Kennzahlen

	Insgesamt	Letzte 365 Tage	In den letzten 30 Tagen
Aufrufe von Kurzbeschreibungen	184	52	6
Gesamttextansichten	3	1	0
PDF-Downloads	8	1	0

Afrikanistik	Internationale Beziehungen	Nahost- und Islamwissenschaften
Altorientalistik und Ägyptologie	Internationales Recht	Pädagogik
Amerikanistik	Judaistik	Philosophie
Asienwissenschaften	Klassische Altertumswissenschaft	Religionswissenschaft
Bibelauslegung	Kunstgeschichte	Slawistik und Eurasienkunde
Biologie	Literatur- und Kulturwissenschaften	Sozialwissenschaften
Biowissenschaften	Medienwissenschaft	Sprachen und Linguistik
Buchgeschichte und Kartographie	Menschenrechte und humanitäres Völkerrecht	Theologie und Christentum
Geschichte	Musikwissenschaft

Fachgebiete

Autor:innen

Open Access

Produkt-Informationen

Über uns

Kontakt

Mammary cell turnover: relevance to lactation persistency and dry period management

Zitierungsangaben

Link teilen

Ruminant physiology

Digestion, metabolism and impact of nutrition on gene expression, immunology and stress

Inhaltsverzeichnis

Kennzahlen

Kennzahlen