Chinese Journal of Animal Nutrition >

2021 , Vol. 33 >Issue 4: 2321 - 2334

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.04.050

Effects of Earthworm Powder and Yucca Extract on Growth Performance, Nutrient Digestion and Metabolism, and Emissions of Repugnant Substances and Harmful Gases during Fermentation of Fecal-Urine Mixture for Growing Pigs

  • PU Shihua ,
  • LONG Dingbiao ,
  • LIU Zuohua ,
  • ZHU Jiaming ,
  • JIAN Yue ,
  • ZENG Yaqiong ,
  • WANG Ying
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  • 1. Chongqing Academy of Animal Science, Chongqing 402460, China;
    2. Scientific Observation and Experiment Station of Livestock Equipment Engineering in Southwest, Ministry of Agriculture, Chongqing 402460, China;
    3. College of Animal Sciences, Southwest University, Chongqing 402460, China

Received date: 2020-06-19

  Online published: 2021-04-15

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Abstract

This experiment was conducted to investigate the effects of earthworm powder and yucca extract on growth performance, nutrient digestion and metabolism, and emissions of repugnant substances and harmful gases during fermentation of fecal-urine mixture for growing pigs. A double-factor design was adopted in this experiment. Fifty-six healthy Duroc×Landrace×Yorkshire (DLY) pigs with the body weight of 30 to 35 kg were selected and allocated to 4 groups with 14 replicates per group and 1 pig per replicate according to the principle of similar weight and consistent gender. A basal diet was the diet of control group, and the diet of earthworm powder group, yucca extract group, and earthworm powder+yucca extract group was adding 0.500% earthworm powder, 0.012% yucca extract and 0.500% earthworm powder+0.012% yucca extract into the basal diet, respectively. The experiment lasted for 80 days. The results showed as follows:1) compared with the control group, the feed/gain of growing pigs was significantly reduced by individually adding yucca extract (P<0.05), and the apparent digestibility of crude protein and the apparent metabolic rate of crude protein were significantly improved by simultaneously adding earthworm and yucca extract into the diets (P<0.05). 2) In the anaerobic fermentation process, individually adding yucca extract could significantly increase the organic matter content in fecal-urine mixture, and improve the carbon/nitrogen (C/N) to 16 in the fecal-urine mixture, and promote the gas production of feces. 3) Compared with the control group, individually adding earthworm powder and yucca extract could significantly reduce the concentration of 3-methyindole, ammonia and hydrogen sulfide (P<0.05). When those two additives combined used that had a synergistic promoting effect on reducing the production of volatile fatty acids, repugnant substances and odorous gases in the fecal-urine mixture during fermentation. In conclusion, yucca extract and earthworm powder combined used in the diet can promote the digestion and absorption of protein, and reduce the emissions of volatile fatty acids, repugnant substances and harmful gases during fermentation of fecal-urine mixture for growing pigs, which can be used as feed additives to reduce the emission of fecal pollutants from the source, the discharge of fecal pollutants at the source, and is of great significance to strengthen the management of livestock environment and relieve the pressure of livestock manure resource treatment.

Key words： earthworm powder; yucca extract; growth performance; volatile fatty acids; anaerobic fermentation

Cite this article

PU Shihua , LONG Dingbiao , LIU Zuohua , ZHU Jiaming , JIAN Yue , ZENG Yaqiong , WANG Ying . Effects of Earthworm Powder and Yucca Extract on Growth Performance, Nutrient Digestion and Metabolism, and Emissions of Repugnant Substances and Harmful Gases during Fermentation of Fecal-Urine Mixture for Growing Pigs[J]. Chinese Journal of Animal Nutrition, 2021 , 33(4) : 2321 -2334 . DOI: 10.3969/j.issn.1006-267x.2021.04.050

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