An Evaluation of the Impact of Increased Lactation Length on the Reproductive Efficiency of Sows in Commercial Herds(Theriogenology)

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概要

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• The objective of this study was to evaluate the impact of increased lactation length (LL) on the reproductive efficiency of sows in herds that were performing differently. The present study used 69,314 parity records for 38,532 sows in 114 herds. Two herd groups, high-performing herds and other herds, were formed on the basis of the upper 25th percentile of pigs weaned per mated female per year. Reproductive efficiency was measured as the estimated number of pigs born alive per farrowed sow per year (PBASY) and was calculated as actual subsequent pigs born alive (PBA) multiplied by estimated litters per farrowed sow per year (LSY) for each farrowed sow. The estimated LSY was calculated as 365 days divided by the actual farrowing interval. Multilevel linear mixed-effects models were used. In our evaluation, an interaction between LL and the herd groups was found for the estimated PBASY (P<0.05). The estimated PBASY of high-performing herds did not decrease as LL increased (P>0.10), although the estimated PBASY of the other herds decreased by 0.04 pigs as LL increased by 1 day (P<0.05). As LL increased from 14 to 28 days, the estimated LSY decreased by 0.19 in the two herd groups (P<0.05). Furthermore, as LL increased by 1 day, subsequent PBA increased by 0.08 pigs in high-performing herds and increased by 0.04 pigs in the other herds (P<0.05). Increased LL may not decrease the performance of sows in high-performing herds, but it may decrease the performance in other herds.

• 2009-03-25

著者

• Hoshino Yuko

  School Of Agriculture Meiji University

• KOKETSU Yuzo

  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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