By-Parity Nonproductive Days and Mating and Culling Measurements of Female Pigs in Commercial Breeding Herds(Theriogenology)

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概要

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• The objectives of this study were to determine by-parity nonproductive female days (NPD or NPDs) and mating and culling measurements, to determine correlations between by-parity NPDs, mating and culling measurements and herd productivity measurements, and to compare by-parity NPDs between three herd groups (105 herds) with differing reproductive productivities. NPD was defined as the number of days when mated females were neither gestating nor lactating. Correlation analysis and mixed-effects models were performed. On the basis of the 25th and 75th percentiles of pigs weaned per mated female per year, three herd groups were formed: high-, intermediate-, and low-performing herds. The mean NPD of 105 breeding herds (mean±SEM) was 52.7±1.6 days. The NPDs in parities 1, 6 and ≥7 were higher than those in parities 0, 2, 3 and 4 (P<0.05). High-performing herds had a higher farrowing percentage and lower percentage of reserviced females than low-performing herds (P<0.05). Lower by-parity NPDs were correlated with lower percentages of reserviced females, higher farrowing percentages and lower culling rates from parities 1 to 5 (P<0.05). High-performing herds had NPDs that were >25 days lower in parities 0 to 3 than low-performing herds (P<0.05). High-performing herds had lower culling rates in parities 2 to 5 and higher culling rates in parities 6 and ≥7 than low-performing herds (P<0.05). The present study indicates that monitoring the by-parity NPD and mating and culling measurements is a good tool for improvement of herd productivity.

• 社団法人日本獣医学会の論文
• 2009-03-25

著者

• Sasaki Yosuke

  School Of Agriculture Meiji University

• Koketsu Yuzo

  School Of Agriculture Meiji University

• Koketsu Yuzo

  School Of Agriculture Meiji Univ.

関連論文

• Factors Associated with a Single-Mating Occurrence in First-Serviced and Reserviced Female Pigs on Commercial Farms
• An Evaluation of the Impact of Increased Lactation Length on the Reproductive Efficiency of Sows in Commercial Herds(Theriogenology)
• Double and Triple Matings Associated with Reproductive Performance in First-Serviced and Reserviced Female Pigs in Commercial Herds
• Associations between Age of Gilts at First Mating and Lifetime Performance or Culling Risk in Commercial Herds
• Swine Herds Achieve High Performance by Culling Low Lifetime Efficiency Sows in Early Parity
• By-Parity Nonproductive Days and Mating and Culling Measurements of Female Pigs in Commercial Breeding Herds(Theriogenology)
• A High Percentage of Pigs Born Dead in Litters in High-, Intermediate- and Low-Performing Herds

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