性成熟前から5産次まで異なる飼養方式を継続した雌豚の繁殖成績

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タイトル別名
  • Swine Reproductive Traits under Different Housing Systems through Pre-puberty to Fifth Parity
  • セイ セイジュク マエ カラ 5サンジ マデ コトナル シヨウ ホウシキ オ

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Twelve F1 female littermates (Landrace×Large White) were compared for reproductive performances under two different housing systems, individual stall and group pen (three/group), through pre-puberty (>60kg in body weight) to fifth parity. They were randomly assigned to two groups across litters and fed the same feeding regime. Estrus was checked once a day with the aid of a boar and twice servicing was performed per estrus either by artificial insemination or natural service. Reproductive criteria recorded were age at first estrus, dates of first service, conception and farrowing, body weight at first estrus, at conception and at farrowing, litter size at birth and at weaning, piglet weight at birth and at weaning, percentage of weaned piglets against live born litter size, along with date of returning to estrus after first parity weaning and subsequent parities. Gilts in group pens reached puberty at an average of 24.5 days earlier than gilts in the individual stalls. Average length of the estrous cycle from the first heat to the second heat was significantly shorter (P<0.05) in group pen gilts than the individual stall gilts, 22.2 vs. 26.0 days. Average body weight at first service was significantly higher (P<0.05) in individual stall gilts than in the group pen gilts, 137.2 vs. 123.8kg. Litter size at birth and at weaning through all parities averaged 9.6 and 8.7, and 11.0 and 9.4 for sows kept in the group pens and in the individual stalls, respectively. Average piglet weight at birth was significantly higher (P<0.01), through all parities, in group pen sows than individual stall sows, 1.55 vs. 1.32kg. Average piglet weight at weaning was significantly higher (P<0.01) in group pen sows compared to individual stall sows through all parities, 7.43 vs. 6.37kg. Average percentage of weaned piglets against live born litter size through all parities was significantly higher (P<0.05) in group pen sows than individual stall sows, 96 vs. 88%. Average interval from weaning to mating through all parities was significantly shorter (P<0.01) in sows kept in the group pens compared to sows in the individual stalls, 10.8 vs. 41.0 days. Individual cases of both locomotive defects and abortion were encountered in solitarily confined sows.

収録刊行物

  • 日本畜産学会報

    日本畜産学会報 64 (10), 964-970, 1993

    公益社団法人 日本畜産学会

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