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• W4220665712 abstract "Abstract Energy demands during lactation greatly influence sow body condition and piglet performance. We hypothesized that primiparous sows or sows with reduced body condition would produce piglets with reduced growth and delayed sexual maturation. Eight weekly farrowing seasons were used to evaluate sow body condition (post-farrowing, PF and weaning, WN) and piglet growth from 157 dams. Body condition was measured at PF and WN using sow calipers (last rib and hip) and 10th rib ultrasound. Sows were categorized as thin, moderate, or fat by caliper (PF or WN). Individual pig weights were recorded on approximately 1, 10, WN, 45, 100, and 145 d of age. At 100 and 145 d of age, 10th-rib backfat and loin eye area were measured on 567 pigs and first estrus was monitored in 176 gilts reserved for breeding selection beginning at approximately 170 d of age. Sows had similar (P &gt; 0.10) PF last rib caliper measurements but at WN, first parity sows had the smallest caliper measurements compared to other parities (P &lt; 0.05). Parities 1, 2, and 3 sows had similar (P &gt; 0.10) loin eye area at PF; however, at WN first parity sows had the smallest loin eye area (P &lt; 0.05; 38.2 ± 0.63 cm2). Parity 1 sows had the greatest (P &lt; 0.05) reduction of backfat and loin eye area over the lactation period (−2.9 ± 0.31 mm and −2.6 ± 0.49 cm2, respectively). At 1 d of age and WN, piglets from first parity sows weighed the least (P &lt; 0.05) but were the heaviest (P &lt; 0.05) at 100 and 145 d of age. Pigs from first parity litters had larger (P &lt; 0.05) loin eye area at 100 and 145 d of age and greater backfat (P &lt; 0.05) at 145 d of age. Fat sows at WN (last rib or hip) had the lightest (P &lt; 0.05) piglets at 10 d of age and WN. However, at 45 d of age, piglets from fat sows (last rib or hip) were heavier (P &lt; 0.05) than piglets from moderate and thin sows. Tenth rib backfat at 100 and 145 d of age tended (P &lt; 0.10) to be less in pigs reared by thin sows (PF and WN hip). Tenth rib loin eye area was similar among pigs reared by fat, moderate, or thin sows. Gilts developed in litters from fourth parity sows had (P &lt; 0.05) delayed age at puberty in contrast to gilts from first or third parity sows (200.9 ± 4.96 d vs. 189.0 ± 2.29 d and 187.5 ± 2.84 d, respectively). Although progeny body weights were typically less from first parity dams through 45 d of age, these progeny were similar or heavier at 100 and 145 d of age in contrast to progeny from other parities. Furthermore, gilt progeny from first parity dams did not have delayed pubertal attainment." @default.
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• W4220665712 date "2022-04-01" @default.
• W4220665712 modified "2023-10-18" @default.
• W4220665712 title "Dam parity structure and body condition during lactation influence piglet growth and gilt sexual maturation through pre-finishing" @default.
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• W4220665712 doi "https://doi.org/10.1093/jas/skac031" @default.
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