
67頭のランドレース種若雌隊の超音波で測定した背脂肪層の厚さと生時,2週時の1腹子豚数および平均子豚体重との関係を調べた.交配時および量娩時の体重と背脂肪層の厚さの間には,それぞれ0.503と0.527の相関が見られたが,若雌豚の体重と繁殖性との間では,妊娠中の体重増加量と生時の子豚体重との間に0.264の相関が認められた以外に統計的に有意な相関は見られなかった.交配時の背脂肪層の厚さ自体は,いずれの繁殖形質とも有意な相関は示さなかったが,体重あたりの厚さは生時,2週時の子豚数とそれぞれ-0.255,-0.248の相関を示した.90kgから交配時までの体重あたりの背脂肪層の増加率と生時の子豚数との関係は直線的でなく,体重1kgあたり0.2mm以上の増加をした個体は子豚数が少なくなる傾向を示した。分娩時の背脂肪層の厚さは,性時の平均子豚体重と0.338の相関を示し,体重あたりの厚さは生時,2週時の子豚数および生時の平均子豚体重と,それぞれ-0.357,-0.259,0285の相関を示した.
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