Effects of Carrot Tassel Silage Replacing Whole Corn Silage on Performance,Milk Quality,Nutrient Apparent Digestibility,Antioxidant Capacity and Immune Function of Wendeng Dairy Goats during Lactation Period
The aim of this study was to investigate the effects of carrot tassel silage replacing whole corn silage on performance,milk quality,nutrient apparent digestibility,antioxidant capacity and immune function of Wendeng dairy goats during lactation period.Sixty-four healthy Wendeng dairy goats with body weight of(48.34±1.86)kg and milk yield of(1.29±0.46)kg/d,3 parities and in lactation 150 d were selected and di-vided into 4 groups,with 4 replicates per group and 4 goats per replicate.The control group was fed a basal di-et,and in experimental groups 1,2 and 3,20％,30％ and 40％ of whole corn silage in the basal diet were re-placed by carrot tassel silage,respectively.The experiment period was 67 days,including 7 days of pre-test and 60 days of formal test.The results showed as follows:1)compared with the control group,the average daily milk yield in the experimental groups 1 and 3 was significantly increased(P＜0.05);the feed/milk ratio in the experimental group 1 was significantly decreased(P＜0.05),and the 4％ fat corrected milk(FCM)yield was significantly increased(P＜0.05);the average daily feed intake in the experimental group 3 was sig-nificantly increased(P＜0.05).2)Compared with the control group,the content of β-carotene in the milk in the experimental group 3 was extremely significantly increased(P＜0.01),and it in the experimental group 2 was extremely significantly increased(P＜0.05);the contents of vitamin A and sodium copper chlorophyll in the milk in the experimental groups 2 and 3 were extremely significantly increased(P＜0.01).No pesticide res-idue was detected in the milk of each group.3)Compared with the control group,the apparent digestibility of crude protein in the three experimental groups was extremely significantly increased(P＜0.01),and the appar-ent digestibility of dry matter in the experimental groups 1 and 3,the apparent digestibility of crude fat in the experimental group 1,and the apparent digestibility of neutral detergent fiber in the experimental group 3 were significantly increased(P＜0.05).4)Compared with the control group,the content of serum immunoglobulin G(IgG)in the experimental group was significantly increased(P＜0.05),and the activities of superoxide dis-mutase(SOD)and glutathione peroxidase(GSH-Px)were extremely significantly increased(P＜0.01);the contents of serum total protein(TP)and globulin(GLB)in the experimental group 1 were significantly in-creased(P＜0.05),the contents of urea nitrogen(UN)and malondialdehyde(MDA)were significantly de-creased(P＜0.05),and the total antioxidant capacity(T-AOC)was extremely significantly increased(P＜0.01).In conclusion,using carrot tassel silage equivalently to replace 20％whole corn silage in the diet can improve the milk performance,milk quality,nutrient apparent digestibility,antioxidant capacity and immune function of Wendeng dairy goats during lactation period.[Chinese Journal of Animal Nutrition,2024,36(1):438-450]
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