Changes in the microscopic anatomy of the bovine teat canal during mammary involution.

M. P. Comalli, R. J. Eberhart, Lester C. Griel, Jr., H. Rothenbacher

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Changes in the microscopic anatomy of the bovine teat canal were examined during mammary involution. Morphometric analyses revealed a significant (P less than 0.05), temporary dilatation of the teat canal lumen on day 7 of the nonlactating period. Additionally, the teat canal epithelium physiologically atrophied as evidenced by decreased cross-sectional area and thickness during the first 30 days of the nonlactating period, significantly so (P less than 0.05) between days 0 and 7. This physiologic atrophy was due mainly to a reduction in area and thickness of the stratum granulosum and may have resulted from continuing keratinization, a process that led to increased thickness of the keratin layer and formation of a functional plug during later stages of involution. Changes in cells of the stratum granulosum indicated a decrease in the rate of epithelial cell maturation during involution. The mitotic index (percentage of basal cells in mitosis) of the teat canal epithelium decreased significantly (P less than 0.05) between days 0 and 7 of the nonlactating period. Bacteria, observed in histologic sections, appeared to colonize only certain regions of the keratin layer. Seemingly, changes in the teat canal during mammary involution may be important factors in changing susceptibility to new intramammary infection during the early and mid-nonlactating periods.

Original languageEnglish (US)
Pages (from-to)2236-2242
Number of pages7
JournalAmerican Journal of Veterinary Research
Volume45
Issue number11
StatePublished - Nov 1 1984

Fingerprint

mammary involution
teats
Keratins
Anatomy
Breast
Epithelium
Mitotic Index
Granulosa Cells
cattle
Mitosis
keratin
Atrophy
Dilatation
Epithelial Cells
Bacteria
epithelium
keratinization
Infection
atrophy
mitosis

All Science Journal Classification (ASJC) codes

  • veterinary(all)

Cite this

Comalli, M. P., Eberhart, R. J., Griel, Jr., L. C., & Rothenbacher, H. (1984). Changes in the microscopic anatomy of the bovine teat canal during mammary involution. American Journal of Veterinary Research, 45(11), 2236-2242.
Comalli, M. P. ; Eberhart, R. J. ; Griel, Jr., Lester C. ; Rothenbacher, H. / Changes in the microscopic anatomy of the bovine teat canal during mammary involution. In: American Journal of Veterinary Research. 1984 ; Vol. 45, No. 11. pp. 2236-2242.
@article{f37644251f4e44f7abfe087a179dfcbd,
title = "Changes in the microscopic anatomy of the bovine teat canal during mammary involution.",
abstract = "Changes in the microscopic anatomy of the bovine teat canal were examined during mammary involution. Morphometric analyses revealed a significant (P less than 0.05), temporary dilatation of the teat canal lumen on day 7 of the nonlactating period. Additionally, the teat canal epithelium physiologically atrophied as evidenced by decreased cross-sectional area and thickness during the first 30 days of the nonlactating period, significantly so (P less than 0.05) between days 0 and 7. This physiologic atrophy was due mainly to a reduction in area and thickness of the stratum granulosum and may have resulted from continuing keratinization, a process that led to increased thickness of the keratin layer and formation of a functional plug during later stages of involution. Changes in cells of the stratum granulosum indicated a decrease in the rate of epithelial cell maturation during involution. The mitotic index (percentage of basal cells in mitosis) of the teat canal epithelium decreased significantly (P less than 0.05) between days 0 and 7 of the nonlactating period. Bacteria, observed in histologic sections, appeared to colonize only certain regions of the keratin layer. Seemingly, changes in the teat canal during mammary involution may be important factors in changing susceptibility to new intramammary infection during the early and mid-nonlactating periods.",
author = "Comalli, {M. P.} and Eberhart, {R. J.} and {Griel, Jr.}, {Lester C.} and H. Rothenbacher",
year = "1984",
month = "11",
day = "1",
language = "English (US)",
volume = "45",
pages = "2236--2242",
journal = "American Journal of Veterinary Research",
issn = "0002-9645",
publisher = "American Veterinary Medical Association",
number = "11",

}

Comalli, MP, Eberhart, RJ, Griel, Jr., LC & Rothenbacher, H 1984, 'Changes in the microscopic anatomy of the bovine teat canal during mammary involution.', American Journal of Veterinary Research, vol. 45, no. 11, pp. 2236-2242.

Changes in the microscopic anatomy of the bovine teat canal during mammary involution. / Comalli, M. P.; Eberhart, R. J.; Griel, Jr., Lester C.; Rothenbacher, H.

In: American Journal of Veterinary Research, Vol. 45, No. 11, 01.11.1984, p. 2236-2242.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Changes in the microscopic anatomy of the bovine teat canal during mammary involution.

AU - Comalli, M. P.

AU - Eberhart, R. J.

AU - Griel, Jr., Lester C.

AU - Rothenbacher, H.

PY - 1984/11/1

Y1 - 1984/11/1

N2 - Changes in the microscopic anatomy of the bovine teat canal were examined during mammary involution. Morphometric analyses revealed a significant (P less than 0.05), temporary dilatation of the teat canal lumen on day 7 of the nonlactating period. Additionally, the teat canal epithelium physiologically atrophied as evidenced by decreased cross-sectional area and thickness during the first 30 days of the nonlactating period, significantly so (P less than 0.05) between days 0 and 7. This physiologic atrophy was due mainly to a reduction in area and thickness of the stratum granulosum and may have resulted from continuing keratinization, a process that led to increased thickness of the keratin layer and formation of a functional plug during later stages of involution. Changes in cells of the stratum granulosum indicated a decrease in the rate of epithelial cell maturation during involution. The mitotic index (percentage of basal cells in mitosis) of the teat canal epithelium decreased significantly (P less than 0.05) between days 0 and 7 of the nonlactating period. Bacteria, observed in histologic sections, appeared to colonize only certain regions of the keratin layer. Seemingly, changes in the teat canal during mammary involution may be important factors in changing susceptibility to new intramammary infection during the early and mid-nonlactating periods.

AB - Changes in the microscopic anatomy of the bovine teat canal were examined during mammary involution. Morphometric analyses revealed a significant (P less than 0.05), temporary dilatation of the teat canal lumen on day 7 of the nonlactating period. Additionally, the teat canal epithelium physiologically atrophied as evidenced by decreased cross-sectional area and thickness during the first 30 days of the nonlactating period, significantly so (P less than 0.05) between days 0 and 7. This physiologic atrophy was due mainly to a reduction in area and thickness of the stratum granulosum and may have resulted from continuing keratinization, a process that led to increased thickness of the keratin layer and formation of a functional plug during later stages of involution. Changes in cells of the stratum granulosum indicated a decrease in the rate of epithelial cell maturation during involution. The mitotic index (percentage of basal cells in mitosis) of the teat canal epithelium decreased significantly (P less than 0.05) between days 0 and 7 of the nonlactating period. Bacteria, observed in histologic sections, appeared to colonize only certain regions of the keratin layer. Seemingly, changes in the teat canal during mammary involution may be important factors in changing susceptibility to new intramammary infection during the early and mid-nonlactating periods.

UR - http://www.scopus.com/inward/record.url?scp=0021530913&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0021530913&partnerID=8YFLogxK

M3 - Article

VL - 45

SP - 2236

EP - 2242

JO - American Journal of Veterinary Research

JF - American Journal of Veterinary Research

SN - 0002-9645

IS - 11

ER -

Comalli MP, Eberhart RJ, Griel, Jr. LC, Rothenbacher H. Changes in the microscopic anatomy of the bovine teat canal during mammary involution. American Journal of Veterinary Research. 1984 Nov 1;45(11):2236-2242.