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

• Main Authors: SuHyup Lee, Abdolreza Hosseindoust, YoHan Choi, MinJu Kim, KwangYeol Kim, JunHyung Lee, YoungHwa Kim, ByungJo Chae
• Format: Article
• Language: English
• Published: Korean Society of Animal Sciences and Technology 2019-09-01
• Series: Journal of Animal Science and Technology
• Subjects: gilts; mating; longevity; backfat; litter performance; leptin
• Online Access: http://www.ejast.org/archive/view_article?pid=jast-61-5-285

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, ≤ 220 d; AG2, 220 to 240 d; AG3, 240 ≤ d), and three weights (WT1 ≤ 140 kg; WT2, 140 to 149 kg; WT3, 150 ≤ 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.