肉豚と同様の飼養管理下における一代雑種雌豚の性成熟と生殖器の大きさ  [in Japanese] The Growth of Genital Organ in Both Prepubertal and Postpubertal First-Cross Gilts under the Same Rearing Condition as Fattening Pigs  [in Japanese]

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Abstract

ランドレースと大ヨークシャーの一代雑種雌豚165頭を用い, 肉豚と同様の飼養管理下における性成熟の到達状況を調査した。同時に, 到達以前と以後で生殖器の大きさがどのように異なるかを検討した。供試豚は体重25kg前後からと殺時まで, 一部すのこ状コンクリート床の肥育用豚舎で6~10頭群飼し (飼育密度約1m<sup>2</sup>/頭), 旧豚産肉能力検定用飼料 (可消化養分総量70.1%, 可消化粗蛋白12.7%) を不断給餌した。性成熟に到達した雌豚の割合は, 体重82~137kg, 日齢152~260日の範囲で全体の20%であった。それらの生殖器は, 総重量のほか, 各部位 (卵巣, 卵管, 子宮角, 子宮体, 子宮頸および膣) の重量あるいは長さでも性成熟前の豚を大きく上回った (膣長のみP<0.05, 他はいずれもP<0.01)。性成熟前の豚では, 生殖器総重量は日齢の進んだほど大きく (P<0.01), 性成熟後の豚では日齢のいかんにかかわらず体重が重いほど大きい (P<0.05) 傾向たあった。

One hundred and sixty-five Landrace×Large White gilts from 51 litters were randomly slaughtered between 152 and 260 days of age (liveweight of 82 to 137kg) to study the growth of genital organs before and after the attainment of puberty. They were housed in groups of six to ten per pen (about 1m<sup>2</sup> per pig) and had an ad libitum access to 70.1% total digestible nutrient and 12.7% digestible crude protein diet from approximately 25kg live weight to slaughter, which was almost the same rearing condition as fattening pigs in our experiment station. The rate of gilts already attained puberty was just twenty percent of all. The genital organs of these pigs were significantly larger (P<0.01) than those of prepubertal ones. In prepubertal gilts, the genital organs grew with advance of age (P<0.01), whereas those of postpubertal gilts grew according to increase in the body weight (P<0.05).

Journal

  • Nihon Yoton Gakkaishi

    Nihon Yoton Gakkaishi 35(1), 18-24, 1998-03-10

    The Japanese Society of Swine Science

References:  22

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008284931
  • NII NACSIS-CAT ID (NCID)
    AN10202971
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0913882X
  • NDL Article ID
    4425472
  • NDL Source Classification
    ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z18-1082
  • Data Source
    CJP  CJPref  NDL  J-STAGE  JASI 
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