›› 2018, Vol. 45 ›› Issue (10): 2752-2760.doi: 10.16431/j.cnki.1671-7236.2018.10.012

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Effects of Different Molasses Levels on in vitro Ruminal Fermentation Characteristics and Nutrient Degradation of Whole “Zhang Hybrid Millet” Silage

WU Jincai1, LIU Tingting1, YUE Chunwang1, GUO Jinshuang1, ZHAO Zhihai2, FAN Guangyu2, HAO Fengyong3, KONG Xianghao1, SUN Maohong1   

  1. 1. College of Animal Science and Technology, Hebei North University, Zhangjiakou 075131, China;
    2. Zhangjiakou Academy of Agricutural Science, Zhangjiakou 075000, China;
    3. Animal Husbandry and Veterinary of Hebei Province, Shijiazhuang 050000, China
  • Received:2018-02-23 Online:2018-10-20 Published:2018-10-20

Abstract:

The study was aimed to explore the effects of different molasses levels on in vitro ruminal fermentation characteristics and nutrient degradation of whole "Zhang Hybrid Millet" silage.Three Holstein dairy cows with permanent rumen fistula and similar body condition were chosen and the rumen fluid was collected.0(control group),2%,4% and 6% molasses were added to whole "Zhang Hybrid Millet" silage for 60 d fermentation at indoors temperature.After that the quality of whole "Zhang Hybrid Millet" silage were valued.The results showed that:① The DM of 4% molasses group was significantly higher than that of 2% and 6% molasses groups (P < 0.05),which was not significantly different with control group (P > 0.05).There was no significant difference of CP content among the groups (P > 0.05);The content of NDF of 4% molasses group was significantly lower than that of control group and 2% molasses group (P < 0.05),while the ADF was significantly lower than other group (P < 0.05).② After adding 4% molasses,DMD was significantly higher than that in control group and 2% molasses group (P < 0.05).The CPD and NDFD of 4% molasses group was significantly higher than that of control group and 6% molasses group (P < 0.05),while the ADFD was significantly higher than that in control group (P < 0.05).③Compared with the control group,ME,NEL and GP72 h of molasses adding groups were increased (P > 0.05).And the C value of 4% molasses group was significantly lower than that of control group (P < 0.05) when the gas production volume reached the theoretical maximum yield of 1/2.④There was no significant difference of pH,NH3-N,MCP,TVFA,NGR,acetic acid,propionic acid,butyric acid,valeric acid and branched-chain fatty acid between molasses adding groups and control group (P > 0.05),while the fermentation parameters of 4% molasses group were better.Under the condition of this study, the optimum level of molasses was 4%.

Key words: molasses; whole “Zhang Hybrid Millet” silage; in vitro rumen fermentation; kinetic parameters of gas production

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