栄養・飼養Ⅰ

[II-19-04] Effects of seaweed (Laminaria longissima) and alginic acid on feacal IgA and serum antioxidant status in nursing calves

*Yadanar Chit Mya¹, Nobuyuki KUSABA¹, Tomas Javier Acosta¹, Takehiro NISHIDA¹, Naoki FUKUMA¹, Masaaki HANADA¹ (1. Obihiro University of Agriculture and Veterinary Medicine)

It has been reported that brown algae have immunomodulatory and antioxidant effects in pigs and weaned calves. Laminaria longissima (LL) is one of the brown algae that grows along the coast of Hokkaido. This study aimed to investigate the effects of LL and alginic acid (AA), a typical polysaccharide contained in LL, on immunity and antioxidant capacity in nursing calves. Twenty four Holstein calves were divided into three groups and kept till 42 days of age individually. Calves in CON group were fed 6L/d of milk replacer, SEA group were fed 6L/d of milk replacer with 7.2 g of LL, and ALG group were fed 6L/d of milk replacer with 1.8 g of AA. IgA and total antioxidant capacity (TAOC) were measured through fecal and blood samples on days 1, 14, 28, and 42. Daily gain were similar among the groups, averaging 0.67 kg/d. Fecal IgA and serum TAOC did not differ among the groups. Fecal IgA decreased from 6.14 mg/g DM at day 1 to 3.18 mg/g DM at day 14 without significant changes on days 28 and 42. Lower serum TAOC were observed at d 14 and 28 (0.17 μM) when compared to d 1 (0.21 μM). Seaweed and alginic acid did not affect significantly immune system and antioxidative status in calves at the given doses.