Associations between Age of Gilts at First Mating and Lifetime Performance or Culling Risk in Commercial Herds

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概要

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• Age of gilts at first mating (AFM) is a factor associated with reproductive performance of female pigs. The objectives of the present study were to compare AFM and reproductive performance across parity between three herd groups based on a productivity measurement, and to determine lifetime performance by AFM and the herd groups. The female data included 38,212 mated gilts entered between 2001 and 2003, and herd data included mean measurements from 2001 to 2006 in 101 herds. Average female inventory of the 101 herds was 370.2 females. Females were categorized into five groups: AFM 188–208, 209–229, 230–250, 251–271 or 272–365 days. Three herd groups were formed on the basis of the upper and lower 25th percentiles of pigs weaned per mated female over six years: high-, intermediate- and low-performing herds. Multilevel mixed-effects models were performed to analyze comparisons. The AFM (± SEM) in high-, intermediate- and low-performing herds were 239.5 ± 0.22, 247.4 ± 0.21 and 256.7 ± 0.35 days, respectively. As the AFM increased from 209–229 to 272–365 days, annualized lifetime pigs born alive (PBA) decreased from 18.2 to 15.3 pigs and the number of parity at removal decreased from 4.8 to 4.1 (P<0.05). In parity 1, females with AFM 209–229 days had fewer PBA, but had lower culling risk and shorter weaning-to-first mating interval than those with AFM 251–271 days (P<0.05). In conclusion, we recommend practicing management such as boar exposure to hasten puberty in gilts and decrease AFM.

著者

• Sasaki Yosuke

  School Of Agriculture Meiji University

• Koketsu Yuzo

  School Of Agriculture Meiji Univ.

• Sasaki Yosuke

  School of Agriculture, Meiji University

• SAITO Hikari

  School of Agriculture, Meiji University

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
• 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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