China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (6): 2074-2081.doi: 10.16431/j.cnki.1671-7236.2021.06.020

• Animal Nutrition and Feed Science • Previous Articles     Next Articles

Effect of Dietary DHA-rich Microalgae on Growth Performance and Serum Antioxidant Indices of Qaidamford Cattle

XU Chenchen1, LI Hui2, ZHANG Shou2, ZHANG Songshan1, HU Ri2, MA Yulin3, SUN Baozhong1, XIE Peng1, LU Fushan2   

  1. 1. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. College of Agriculture and Animal Husbandry, Qinghai University, Xining 810016, China;
    3. Agriculture and Animal Husbandry Bureau of Haixi Prefecture, Delingha 817099, China
  • Received:2020-11-30 Online:2021-06-20 Published:2021-06-18

Abstract: The purpose of this study was to investigate the effects of adding different levels of DHA-rich microalgae to the diet on the growth performance,body measurement index,slaughter performance,and serum antioxidant indices of Qaidamford cattle.A total of 24 healthy 24-month-old Qaidamford bulls were randomly assigned to three groups with 8 cattle per group.GroupⅠ was taken as a control group and fed with basal diets.Groups Ⅱ and Ⅲ were supplemented with 100 and 200 g/d DHA-rich microalgae powder in the basic diet,respectively.The pre-experimental period lasted for 10 days,and the experimental period lasted for 42 days.Growth performance,body size indicators,slaughter performance related indicators,and total antioxidant capacity (T-AOC), superoxide dismutase (SOD),glutathione peroxidase (GSH-Px) activities and malondialdehyde (MDA) content in serum were determined.The results showed that,①Compared with the control group,the average daily gain of groupⅡ was significantly higher (P<0.05),the feed-to-weight ratio were significantly lower of groups Ⅱ and Ⅲ (P<0.05).The body size and slaughter performance had no significantly change among three groups (P>0.05) ②Serum T-AOC and SOD activitie were significantly increased (P<0.05),and the content of MDA (P<0.05) was significantly reduced by adding DHA-rich microalgae to the diet.The GSH-Px activity of group Ⅲ was significantly higher than that of the control group (P<0.05).In conclusion,adding 100 g/d of DHA-rich microalgae to the diet significantly improved the feed conversion rate and serum antioxidant capacity of Qaidamford cattle under the experimental conditions.

Key words: Qaidamford cattle; DHA-rich microalgae; growth performance; serum antioxidant index

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