Molecular Nutrition

Fermentation Quality and in Vitro Digestibility of Italian Ryegrass and Alfalfa Mixed Silage

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  • 1. College of Animal Husbandry Engineering, Henan Vocational College of Agriculture, Zhengzhou 451450, China;
    2. College of Animal Science and Technology, Henan Institute of Animal Husbandry and Economics, Zhengzhou 450046, China;
    3. Henan Animal Husbandry Bureau, Zhengzhou 450002, China;
    4. Animal Husbandry and Veterinary Institute, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China

Received date: 2018-09-06

  Online published: 2019-04-16

Abstract

The objective of this study was to evaluate the effects of ensiling different ratios of Italian ryegrass to alfalfa on the fermentation quality and in vitro digestibility of mixed silage, and to select more suitable mixed silage ratio. This experiment was conducted to 4 groups according to completely random design. The ratios of Italian ryegrass to alfalfa (fresh weight basis) were 100:0 (control group), 85:15 (A1 group), 70:30 (A2 group), 55:45 (A3 group), respectively. After 42 d formation, the fermentation quality and in vitro digestibility of mixed silage were detected. The results showed as follows:1) with the increasing ratio of alfalfa, dry matter recovery increased, A3 group was significantly higher than control group and A1 group (P<0.05); pH in A2 and A3 groups was significantly higher than that in control group and A1 group (P<0.05); with the increasing ratio of alfalfa, lactic acid content decreased, A3 group was significantly lower than control group (P<0.05); ammoniacal nitrogen/total nitrogen in A2 and A3 groups was significantly lower than that in control group (P<0.05); V-score of each group was higher (>90), the mixed silage had higher quality fermentation quality. 2) Crude protein content in A1, A2, A3 groups was significantly higher than that in control group (P<0.05); ash content in A1, A2 groups was significantly higher than that A1 group and control group. Compared with control group, the in vitro digestibility of crude protein, dry matter and neutral detergent fiber in A3 group significantly increased (P<0.05). Our findings suggest that replacement of Italian ryegrass with alfalfa had no unfavourable effects on the fermentation quality, and can improve nutrient values and in vitro digestibility. Comprehensive consideration, it is suggested that more suitable ratio of Italian ryegrass to alfalfa is 55:45.

Cite this article

ZHANG Dinghua, WANG Yanfeng, LIU Jian, WANG Shuli, CHEN Fuying . Fermentation Quality and in Vitro Digestibility of Italian Ryegrass and Alfalfa Mixed Silage[J]. Chinese Journal of Animal Nutrition, 2019 , 31(4) : 1725 -1732 . DOI: 10.3969/j.issn.1006-267x.2019.04.030

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