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Acta Prataculturae Sinica ›› 2021, Vol. 30 ›› Issue (7): 122-132.DOI: 10.11686/cyxb2020256

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Effects of silage additives on quality and in vitro rumen fermentation characteristics of first season ratoon rice whole silage

Shi-yu ZOU1(), Si-kui CHEN1, Qi-yuan TANG2, Dong CHEN1(), Yuan-wei CHEN2, Pan DENG1, Xu-lai HUANG1, Fu-qiang LI3   

  1. 1.College of Animal Science and Technology,Hunan Agriculture University,Changsha 410128,China
    2.College of Agronomy,Hunan Agriculture University,Changsha 410128,China
    3.Hunan Tianhua Industrial Co. ,LTD,Loudi 417000,China
  • Received:2020-06-02 Revised:2020-11-23 Online:2021-07-20 Published:2021-06-03
  • Contact: Dong CHEN

Abstract:

This experiment was conducted to investigate effects of silage additives on quality and in vitro rumen fermentation characteristics of first season ratoon rice whole-crop silage. The experiment compared three fermentation-enhancing preparations of bacterial and enzyme additives, added at 500 g·t-1 fresh weight when ensiling whole crop ratoon rice, and a control (CK, 500 g·t-1 water). The additive treatments were: N1Lactobacillus plantarum (60%)+cellulase (30%)+xylanase (10%); N2L. plantarum (70%)+Enterococcus faecalis (20%)+cellulase (5%)+hemicellulase (5%); N3,L. plantarum (30%)+E. faecalis (60%)+cellulase(5%)+hemicellulase (5%). The silages were sampled after 45 d after ensiling, and the silage quality and in vitro rumen fermentation characteristics analyzed. The results were as follows: 1) After ensiling, the gross energy, total digestible fiber, and acetate values of the N1, N2 and N3 silages were significantly higher than those of CK group (P<0.05), while the contents of neutral and acid detergent fiber and ammoniacal nitrogen∶total nitrogen of the N1, N2 and N3 groups were significantly lower than those of the CK group (P<0.05). Among treated silages, the neutral detergent fiber level of the N2 group was significantly lower than that of N1 and N3 groups (P<0.05). 2) After 24 h in vitro fermentation, the 24 h cumulative gas production, the gas production of rapid degradation and the potential gas production of the N2 group were significantly higher than for the N1, N3 and CK groups (P<0.05), and the potential gas production of the N1 group was significantly higher than for the CK group (P<0.05). The N1 and N2 groups had lower pH than the N3 and CK groups (P<0.05), and the contents of acetate and ammonia of N2 group were significantly higher than those of the N1, N3 and CK groups (P<0.05). The propionate contents of the N1 and N2 groups were significantly higher than those of N3 and CK groups (P<0.05); the acetate∶propionate ratio of the N2 group was significantly lower than that of N3 and CK groups (P<0.05); the degradation rates of dry matter and crude protein of N2 and N3 groups were significantly higher than those of N1 and CK groups (P<0.05); the degradation rates of organic matter, neutral detergent fiber and acid detergent fiber values of the N2 group were significantly higher than for N1, N3 and CK groups (P<0.05). In conclusion, it is suggested that silage additives should be supplemented with E. faecalis, cellulase and hemicellulaseunder the premise that L. plantarum is the main agent required to produce first season ratoon rice whole silage with improved nutritional value in actual production.

Key words: first season ratoon rice, silage additives, silage quality, in vitro rumen fermentation characteristics