若雌豚の背脂肪層の厚さと繁殖性の関係

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  • Relationship of Backfat Thickness to Reproductive Performance of Gilts
  • ワカメス ブタ ノ ハイシボウソウ ノ アツサ ト ハンショクセイ ノ カンケ

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Data from sixty-seven Landrace gilts which had their first litters in the spring of 1972 and 1973 were used to investigate the relationship of backfat thickness to litter size and average pig weight at birth and at two weeks of age. Backfat thickness was measured by ultrasonics as described in the previous pape4) at 90kg, breeding and farrowing. The correlations of backfat thickness with body weight were 0.503 and 0.527 at breeding and farrowing, respectively. Breeding weight and farrowing weight were not significantly correlated with those reproductive traits. Weight gain of gilts during pregnancy was correlated with average birth weight (r=0.264), but not significantly correlated with litter size and average two weeks weight of piglets. Backfat thickness at 90kg and at breeding was not associated with litter size and average pig weight at birth and at two weeks of age. Howewer, backfat thickness per body weight at breeding was found to be negatively correlated with litter size at birth(r=-0.255) and at two weeks (r=-0.248). The relationship between the rate of backfat deposition in relation to body weight from 90kg to breeding and litter size at birth was not linear. There was a tendency for litter size at birth to decrease when the backfat gain in the period was greater than 0.2mm per body weight gain (kg). It was also found that backfat thickness per body weight at farrowing was correlated with litter size at birth (r=-0.357) and at two weeks (r=-0.259), and with average birth weight (r=0.285) while backfat thickness at farrowing was correlated only with average birth weight (r=0.338).

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