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Age and weight at first mating affects plasma leptin concentration but no effects on reproductive performance of gilts

  • Lee, SuHyup (Department of Swine Science, Korea National College of Agriculture and Fisheries) ;
  • Hosseindoust, Abdolreza (College of Animal Life Sciences, Kangwon National University) ;
  • Choi, YoHan (Swine Division, National Institute of Animal Science, Rural Development Administration) ;
  • Kim, MinJu (College of Animal Life Sciences, Kangwon National University) ;
  • Kim, KwangYeol (College of Animal Life Sciences, Kangwon National University) ;
  • Lee, JunHyung (College of Animal Life Sciences, Kangwon National University) ;
  • Kim, YoungHwa (Swine Division, National Institute of Animal Science, Rural Development Administration) ;
  • Chae, ByungJo (College of Animal Life Sciences, Kangwon National University)
  • Received : 2019.07.22
  • Accepted : 2019.09.09
  • Published : 2019.09.30

Abstract

The objective of this study was to verify the best mating age of gilts at the first parity. Gilts (n = 86) were divided into nine groups in a factorial arrangement with three Ages (AG1, ${\leq}220d$; AG2, 220 to 240 d; AG3, $240{\leq}d$), and three weights (WT1 ${\leq}140kg$; WT2, 140 to 149 kg; WT3, $150{\leq}kg$). A higher body weight gain in AG2 sows during gestation. Sows in AG2 group showed a higher body weight gain at first parity and backfat gain in the parity 2 and 3 during gestation. A greater insulin-like growth factor-1 (IGF-1) was observed in AG1 sows compared with AG3 sows at weaning in the second parity. Sows in WT1 group showed a significant positive effect on the plasma IGF-1 at breeding and weaning time in parity 2. Sows in AG3 group showed a higher plasma leptin at breeding, farrowing, and weaning in the parity 1, and at farrowing in parity 2. Sows in WT3 group showed a higher plasma leptin at breeding, farrowing, and weaning in the parities 1 and 2. Considering the insignificant longevity results, the most efficient time for gilts insemination can be at 220 d when their body weight is 140 kg or lower.

Keywords

Gilts;Mating;Longevity;Backfat;Litter performance;Leptin

Acknowledgement

Supported by : Rural Development Administration

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