精料中维生素A添加水平对生茸期马鹿日粮营养物质消化、血液生化指标及鹿茸产量的影响

doi:10.16431/j.cnki.1671-7236.2020.08.013

Abstract

Abstract: This experiment was conducted to study the effects of vitamin A levels of concentrate supplement on the digestion of dietary nutrients,blood biochemical indexes and antler yield of red deer.Eighteen Altai red deers,aged 5 to 7 years old with similar weight and good health were selected and randomly divided into 3 groups,with 6 replicates per group.And they were fed experimental concentrate supplements containing different vitamin A levels,which were 12 800 IU/kg (group Ⅰ),18 800 IU/kg (group Ⅱ) and 24 800 IU/kg (group Ⅲ) respectively.The deers were fed with roughage composed of alfalfa hay and straw freely.And the preliminary feeding period was 15 d and the trial period was 66 d.The results showed that:① The intake of dry matter (DM),organic matter (OM),calcium (Ca) and phosphorus (P) in group Ⅰ were extremely significantly higher than that in the group Ⅱ (P<0.01),and the intake of crude protein (CP) and crude fat (EE) were significantly higher than that in group Ⅱ (P<0.05).CP and P intake in group Ⅲ were significantly higher than that in group Ⅱ (P<0.05).② The digestibility of P in group Ⅰ was significantly higher than that in groups Ⅱ and Ⅲ (P<0.05),while there was no significant difference in the digestibility of other nutrients among the groups (P>0.05).③ The addition of vitamin A in concentrate had no significant effect on protein metabolism and glucose and lipid metabolism in Altai red deer (P>0.05).However,total blood protein (TP) and blood glucose (GLU) increased with the increase of vitamin A,while total cholesterol (TC) and UREA nitrogen decreased.④ AST,ALT and ALP decreased with the increase of vitamin A level,among which the activity of ALP in groups Ⅱ and Ⅲ was significantly lower than that in group Ⅰ (P<0.05).⑤ The blood immunoglobulin content increased with the increase of vitamin A level,among which the immunoglobulin G (IgG) content in group Ⅲ was significantly higher than that in groups Ⅰ and Ⅱ (P<0.01).⑥Malondialdehyde (MDA) content in group Ⅲ was significantly lower than that in group Ⅰ (P<0.05) and glutathione-peroxidase (GSH-PX) activity was significantly higher than that in group Ⅰ (P<0.01).Superoxide dismutase (SOD) activity and total antioxidant capacity (T-AOC) in the three groups increased significantly with the increase of vitamin A level (P<0.01).⑦ Blood growth hormone (GH) contents of groups Ⅲ and Ⅱ were significantly higher than that of group Ⅰ (P<0.01),insulin-like growth factor 1 (IGF-1) and vitamin A contents of group Ⅲ were significantly higher than that of group Ⅰ (P<0.01),blood estradiol (E₂) level rises with concentrate vitamin A level (P<0.01).The blood testosterone (T) and 25-hydroxyvitamin D₃ (25-OH-VD₃) levels increased (P>0.05).⑧ There was no significant difference in velvet antler yield among the groups (P>0.05),with the highest antler yield in group Ⅰ and the lowest in group Ⅲ.To sum up,under the conditions of this experiment,Altai red deer had higher feed intake and antler yield when the vitamin A content of concentration was 12 800 IU/kg,while Altai red deer had stronger immune and antioxidant functions when the vitamin A content of concentration was 24 800 IU/kg.Comprehensive production benefits,recommended concentrate vitamin A level of 12 800 IU/kg was better.

Key words: Altai red deer; concentrate supplement; vitamin A; digestion; blood biochemical indexes

CLC Number:

S825

CAO Ying, KUERBAN·Tulake, YANG Kailun, HE Heqian, HUA Xingyao, LI Lu, JIN Dazhi, YANG Wei, LI Yanlin. Effects of Supplemental Vitamin A Levels of Concentrate Supplement on Nutrient Digestion,Blood Biochemical Indexes and Antler Yield of Red Deer at Antler Growing Stage[J]. China Animal Husbandry and Veterinary Medicine, 2020, 47(8): 2454-2463.

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Effects of Supplemental Vitamin A Levels of Concentrate Supplement on Nutrient Digestion,Blood Biochemical Indexes and Antler Yield of Red Deer at Antler Growing Stage

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