JIA-2018-09

2086 TIAN Xing-zhou et al. Journal of Integrative Agriculture 2018, 17(9): 2082–2095 Table 2 Comparison of chemical composition according to ensiling period of sticky corn stover silage ( SSS) and anthocyanin-rich purple corn stover silage ( PSS) (DM basis) Item 1) Type 2) Ensiling time (d) 3) Mean1 4) SEM P -value 5) 0 7 14 21 42 63 84 105 Silage Time S×T DM (%) SSS 23.3 25.4 26.5 26.7 25.9 27.0 27.7 28.4 26.4 B 1.18 0.0042 0.193 0.970 PSS 26.4 28.6 28.5 28.4 28.7 28.9 29.0 29.0 28.4 A 1.48 Mean2 24.8 27.0 27.5 27.6 27.3 28.0 28.3 28.7 SEM 1.43 1.05 1.16 2.09 2.03 0.842 0.762 1.02 Ash (%) SSS 6.37 6.59 6.72 6.49 6.50 6.83 6.73 6.92 6.64 0.400 0.565 0.832 0.671 PSS 6.91 6.98 7.37 6.96 6.39 6.37 6.35 6.71 6.75 0.360 Mean2 6.64 6.78 7.04 6.73 6.44 6.60 6.54 6.81 SEM 0.143 0.146 0.127 0.146 0.523 0.116 0.897 0.0966 OM (%) SSS 93.6 93.4 93.3 93.5 93.5 93.2 93.3 93.1 93.4 0.400 0.565 0.832 0.671 PSS 93.1 93.0 92.6 93.0 93.6 93.6 93.7 93.3 93.3 0.360 Mean2 93.4 93.2 93.0 93.3 93.6 93.4 93.5 93.2 SEM 0.143 0.146 0.127 0.146 0.523 0.116 0.897 0.0966 GE (kcal g –1 ) SSS 3.93 3.76 4.04 4.06 4.00 4.00 4.04 4.04 3.98 0.0850 0.788 0.145 0.509 PSS 3.93 3.95 3.96 3.99 4.00 4.00 4.00 3.99 3.98 0.0122 Mean2 3.93 3.85 4.00 4.03 4.00 4.00 4.02 4.02 SEM 0.008 0.167 0.0295 0.017 0.012 0.009 0.033 0.010 CP (%) SSS 6.57 6.59 6.87 6.83 6.96 6.98 7.01 7.05 6.86 B 0.135 <0.0001 0.123 0.811 PSS 7.24 7.24 7.29 7.38 7.37 7.40 7.40 7.37 7.34 A 0.113 Mean2 6.91 6.92 7.08 7.11 7.17 7.19 7.20 7.21 SEM 0.0694 0.179 0.106 0.149 0.0591 0.155 0.152 0.0535 NDF (%) SSS 57.7 59.4 60.5 64.4 62.2 62.2 64.8 64.4 62.0 2.78 0.787 0.152 0.986 PSS 56.2 60.5 63.1 63.8 63.7 64.1 64.0 63.2 62.3 2.51 Mean2 57.0 60.0 61.8 64.1 63.0 63.1 64.4 63.8 SEM 1.21 2.52 0.900 0.684 4.59 4.43 1.67 1.86 ADF (%) SSS 19.9 23.9 25.5 26.5 25.3 24.3 25.4 26.2 24.6 1.25 0.294 0.0085 0.240 PSS 24.0 24.3 26.0 25.1 25.9 24.4 25.8 25.6 25.1 0.462 Mean2 22.0 b 24.1 a 25.8 a 25.8 a 25.6 a 24.4 a 25.6 a 25.9 a SEM 0.579 0.627 0.567 0.418 0.369 2.35 0.355 0.323 Hemicellulose (%) SSS 37.9 35.6 34.9 37.9 37.0 37.9 39.4 38.2 37.3 3.63 0.875 0.926 0.940 PSS 32.2 36.2 37.1 38.7 37.8 39.6 38.3 37.6 37.2 2.60 Mean2 35.0 35.9 36.0 38.3 37.4 38.8 38.8 37.9 SEM 1.78 2.54 0.971 0.909 4.92 6.14 1.95 1.58 WSC (%) SSS 6.40 a 3.17 c 2.55 de 2.49 de 2.34 defgh 2.00 fgh 1.88 h 1.94 gh 2.85 0.153 0.0004 <0.0001 <0.0001 PSS 4.65 b 2.72 d 2.42 def 2.28 defgh 2.01 fgh 2.15 efgh 2.00 fgh 2.37 def 2.57 0.132 Mean2 5.52 2.94 2.49 2.38 2.17 2.07 1.94 2.16 SEM 0.0729 0.160 0.122 0.183 0.196 0.117 0.0973 0.149 1) DM, dry matter; OM, organic matter; GE, gross energy; CP, crude protein; NDF, neutral detergent fiber; ADF, acid detergent fiber; WSC, water soluble carbohydrates. 2) Mean2, values represent the means of 6 replicates ( n =6); SEM, standard error of the mean. 3)  Values represent the means of 3 replicates ( n =3). 4)  Mean1, values represent the means of 24 replicates ( n =24). 5) Silage, effect of silage; Time, effect of storage day; S×T, effect of silage and storage day interactions. Means with different lowercase letters are significantly different ( P <0.05); means with different uppercase letters within the same column are significantly different ( P <0.05).