The effect of an extended milking interval on mammary blood flow and
tight junctions between mammary cells in goats
K. Stelwagen, S.R. Davis, V.C. Farr, C.G. Prosser, R.A Sherlock
Dairying Research Corporation, Ruakura Agricultural Centre, Private
Bag, Hamilton, New Zealand
Proceedings of the New Zealand Society of Animal Production. 1993,
53: 159-162
The timing of changes in mammary epithelium cell tight junction
integrity and mammary blood flow during a 36-h milk accumulation was
studied in six lactating (2208 ± 216 g milk/d) Saanen goats. Tight junctions
became disrupted following 21 h of milk accumulation, and mammary blood
flow started to decline at 21 hr. The time both events occurred was not
significantly different (P>0.10) from the time milk secretion began to decline
(19 h). The decline in MBF may be the result of a negative feed-back
response to a reduced demand for metabolites due to a reduced rate of milk
secretion. The fact that mammary tight junctions became disrupted when
milk secretion declined, suggests that impairment of mammary tight junction
integrity is associated with a decrease in milk secretion during an extended
milking interval.
Keywords: NZSAPAB;
Goat; milking interval; plasma lactose; tight junction; blood- milk
potential difference.
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Last Updated 25-01-1997
