Effects of dietary energy levels and β-mannanase supplementation in a high mannan-based diet during lactation on reproductive performance, apparent total tract digestibility and milk composition in multiparous sows

초록

Two experiments were conducted to investigate the effects of dietary supplementation of beta-mannanase and energy level on reproductive performance of multiparous sows during lactation. In Exp. 1, 30 multiparous sows were randomly allotted to three treatments (0400 and 800 units beta-mannanase). In Exp. 2, 60 multiparous sows were fed diets containing 3250 or 3350 kcal ME/kg diet and 0 or 400 units of beta-mannanase in a 2 x 2 factorial arrangement. A linear reduction in sow body weight (BW) loss during lactation was observed with increasing levels of beta-mannanase. The BW change during lactation was significantly lower in sows fed high-energy diets or dietary beta-mannanase. beta-mannanase supplementation increased the apparent total tract digestibility of dry matter, gross energy and mannose. Diets supplemented with beta-mannanase or high-energy diet increased milk fat level. Furthermore, high-energy diet increased lactose level in milk. Collectively, our data indicate that dietary inclusion of beta-mannanase has the potential to improve digestibility of nutrients and reduce sow BW loss during lactation.

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