Determining the impact of increasing standardized ileal digestible lysine for primiparous and multiparous sows during lactation1,2

Abstract

Two experiments were conducted to evaluate the effects of increasing dietary SID Lys in lactation on sow and litter performance. In Exp. 1, a total of 111 primiparous sows (Line 241; DNA Genetics, Columbus, NE) were allotted to 1 of 4 dietary treatments on d 110 of gestation. Dietary treatments included increasing dietary standardized ileal digestible (SID) Lys (0.80, 0.95, 1.10, and 1.25%). During lactation, there were no differences in ADFI or sow BW at weaning (d 21), resulting in no differences in BW loss. However, backfat loss during lactation decreased (linear, P = 0.046) as SID Lys increased. There were no differences in litter weaning weight, litter gain from d 2 to weaning, percentage of females bred by d 7 after weaning, d 30 conception rate, farrowing rate or subsequent litter characteristics. In Exp. 2, a total of 710 mixed parity sows (Line 241; DNA Genetics) were allotted to 1 of 4 dietary treatments at d 112 of gestation. Dietary treatments included increasing SID Lys (0.75, 0.90, 1.05, and 1.20%). Sow BW at weaning increased (quadratic, P = 0.046), and sow BW loss from post-farrow to weaning or d 112 to weaning decreased (quadratic, P ≤ 0.01) as SID Lys increased. Sow backfat loss increased (linear, P = 0.028) as SID Lys increased. Conversely, longissimus muscle depth loss decreased (linear, P = 0.002) as SID Lys increased. Percentage of females bred by d 7 after weaning increased (linear, P = 0.047) as SID Lys increased in parity 1 sows, with no difference in parity 2 or 3+ sows. Litter weight at d 17 and litter gain from d 2 to 17 increased (quadratic, P = 0.01) up to 1.05% SID Lys with no improvement thereafter. For subsequent litter characteristics, there were no differences in total born, percentage born alive, stillborn, or mummies. In conclusion, our results suggest that increasing dietary SID Lys can reduce sow protein loss in lactation. The optimal level of dietary SID Lys required by the sow may vary based on response criteria and parity.

Optimal lysine in diets for high-yielding lactating sows1

“…Lysine is considered the first-limiting amino acid in cerealsoybean meal-based diets fed to lactating sows (Danielsen, 1992). Previous estimates of dietary standardized ileal digestible (SID) Lys requirements for lactating sows vary considerably from 27 to 70 g/d or 4.9 to 10.5 g/kg diet (NRC, 2012;Xue et al, 2012;Gourley et al, 2017). However, most of the research investigating the dietary Lys requirement was conducted with sows weaning <10 piglets per litter and with litter growth rates of 1.4 to 2.3 kg/d (NRC, 2012), whereas Gourley et al (2017) reported that sows required 70 g/d of SID Lys for a litter growth rate of 2.9 kg/d.…”

“…Several studies have estimated the dietary Lys requirement of lactating sows when supplied via intact protein sources (King et al, 1993;Yang et al, 2000;Gourley et al, 2017). However, very few studies have used the approach of increasing dietary Lys while keeping all other amino acids and nutrients constant (Chen et al, 1978;Knabe et al, 1996;Xue et al, 2012) and none of these had litter growth rates above 2.5 kg/d.…”

“…This is much greater than what we estimated in the current study. In the new regression from Tokach et al (2019), however, results from Xue et al (2012) and Gourley et al (2017) were included and they concluded that mixed parity sows require approximately 55 g/d of SID Lys for a litter growth of 2.40 and approximately 70 g/d of SID Lys for a litter growth of 2.9 kg/d, respectively. Different from this study was that great amounts of corn (approximately 64%) were included in their experimental diets as the primary source of starch.…”

Capsaicin and 1,25-Dihydroxyvitamin D3 Glycoside: Effects on the Reproductive Performance of Hyper-Prolific Sows

“…This finding can be attributed to the effect of tolerance to endogenous heat sensation by the sow, which this alkaloid provides from the desensitization of TRPV receptors responsible for the sensation of pain and heat in the body [27]. A higher feed intake during lactation or attenuation of catabolism during this phase improves reproductive performance in the subsequent cycle [28].…”

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“…O número de leitões determina a quantidade de lisina e aminoácidos necessários, e em casos de deficiências nutricionais, as fêmeas mobilizam gordura corporal e proteína para apoiar o crescimento da leitegada (THEIL, 2015). A oferta de aminoácidos dietéticos e proteínas próximo das exigências pode beneficiar a produção de proteína no leite e diminuir a mobilização de proteína muscular em porcas lactantes (GOURLEY et al, 2017;.…”