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KMID : 1025520190610050285
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Journal of Animal Science and Technology
2019 Volume.61 No. 5 p.285 ~ p.293
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Age and weight at first mating affects plasma leptin concentration but no effects on reproductive performance of gilts
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Lee Su-Hyup
Hosseindoust Abdolreza
Choi Yo-Han
Kim Min-Ju
Kim Kwang-Yeol
Lee Jun-Hyung
Kim Young-Hwa
Chae Byung-Jo
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Abstract
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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.
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KEYWORD
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Gilts, Mating, Longevity, Backfat, Litter performance, Leptin
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