Milk-Production Curves of Four Strains in Mice

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  • INO TAKAYOAHI
    <I>First Research Division, National Institute of Animal Health</I>
  • YOSHIKAWA SAKIO
    <I>First Research Division, National Institute of Animal Health</I>
  • YAMAUCHI MINORU
    <I>Laboratory of Animal Physiology, College of Agriculture and Veterinary Medecine, Nihon University</I>
  • SAKUMA YUJI
    <I>Laboratory of Animal Physiology, College of Agriculture and Veterinary Medecine, Nihon University</I>

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Other Title
  • マウスの系統間における乳量曲線の比較
  • マウス ノ ケイトウ カン ニ オケル ニュウリョウ キョクセン ノ ヒカク

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Description

This experiment was carried out to confirm the differences of the milk-production curves of four strains in mice.<BR>The mice used in this experiment were C57BL /6, C3H/He, SS and NC strains maintained in the research colony of our laboratory. The femal mice in each strain were mated at 60 days of age and these females were delivered about 80 days of age. After partutrition the number of young of each mother was kept six.<BR>The amount of milk secreted by lactating mice was estimated by the difference of the weight of 6 young before and after 1-hour-suckling regimen following 8 hour's separation of the young from the mother. The measurement was made every other day from the 4th to the 20th day after parturition.<BR>The average weight of young, the average gain in weight of young and the average growth rate of young on the 12th day after birth was measured. The average weight of young was showed by the average of total weight of 6 young on the birth day (W1) and the 12th day (W2) after birth. The average gain in weight of young was calculated by the equation, (W2-W1) . The growth rate of young was calculated by the equation, { (W2-W1) /W1} x100.<BR>The results obtained were as follows:<BR>1. The milk-production curves showed the different patterns among the strains of mice. The total yield of milk obtained every other day from the 4th day to the 20th day after parturition was larger in SS and C3H/He strains than in C57BL/6 and NC strains.<BR>2. Although the peak period of lactation varied from strain to strain, the pattern of the milkproduction curves was similar in the strains used. The amount of milk-production increased from the low levels at parturition and reached to a peak at about 14-16days. The amount, then, declined to the low level at weaning.<BR>3. The average weight of young and the average gain in weight of young on the 12th day after birth in SS and C3H/He strains showing the higher value in total yieled of milk were better than those of C57BL/6 and NC strains.

Journal

  • EXPERIMENTAL ANIMALS

    EXPERIMENTAL ANIMALS 18 (4), 159-164, 1969

    Japanese Association for Laboratory Animal Science

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