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Related Experiment Videos

Milk accumulation and secretion in the rabbit.

D T Calvert, C H Knight, M Peaker

    Quarterly Journal of Experimental Physiology (Cambridge, England)
    |July 1, 1985
    PubMed
    Summary

    Rabbit mammary glands maintain milk secretion for 24 hours between suckling. Beyond this, milk accumulation, not hormonal levels, reduces secretion rate, suggesting distension is the cause.

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    Area of Science:

    • Reproductive Biology
    • Mammalian Physiology
    • Lactation Biology

    Background:

    • Understanding milk secretion dynamics is crucial for reproductive success in mammals.
    • Rabbit mammary glands exhibit unique adaptations for milk storage and release.

    Purpose of the Study:

    • To investigate the rate of milk secretion and accumulation in rabbit mammary glands over a 24-hour period post-suckling.
    • To determine the factors influencing the decline in milk secretion after prolonged absence of suckling.

    Main Methods:

    • Monitoring mammary gland weight changes over 24 hours to assess milk accumulation.
    • Analyzing milk composition (ions, lactose) during periods of declining secretion.
    • Administering ovine prolactin and allowing suckling of sealed teats to test hormonal and mechanical influences.

    Main Results:

    • Mammary gland weight increased linearly for 24 hours, indicating sustained milk secretion.
    • After 24 hours without suckling, milk accumulation rate declined sharply.
    • Milk composition changed with increased sodium and chloride, and decreased potassium and lactose during secretion decline.
    • Ovine prolactin and suckling of sealed teats did not prevent the decline in secretion rate.

    Conclusions:

    • Rabbit mammary glands are adapted for efficient milk storage over extended periods between suckling.
    • The decline in milk secretion after 24 hours is likely due to mammary distension, not a lack of hormonal stimulation.
    • Mammary distension is proposed as the primary mechanism limiting milk secretion rate in rabbits.

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