Acta Veterinaria et Zootechnica Sinica ›› 2020, Vol. 51 ›› Issue (3): 524-533.doi: 10.11843/j.issn.0366-6964.2020.03.012

• ANIMAL NUTRITION AND FEEDS • Previous Articles     Next Articles

Evaluation of Nutritional Value of Fermented Rapeseed Meal in Growing-finishing Pigs

ZHOU Xiaorong1, SUN Peipei2, LIU Zhiyun1, ZHONG Xiaoxia1, LIU Zuohua1, YANG Feiyun1*   

  1. 1. Chongqing Academy of Animal Sciences, Chongqing Key Laboratory of Pig Industry Sciences, Chongqing 402460, China;
    2. College of Animal Science and Technology, Southwest University, Chongqing 400715, China
  • Received:2019-08-30 Online:2020-03-25 Published:2020-03-20

Abstract: The aim of this study was to assess the nutritional value of solid-state fermentation rapeseed meal(FRSM) by metabolic test in growing-finishing pigs. Sixteen healthy Duroc×Landrace×Yorkshire crossbred barrows with initial body weight of (71.25±1.23) kg were randomly assigned to 4 dietary treatments,with 4 replicates per treatment and 1 pig per repeat. The 4 diets were corn-soybean meal basal diet, rapeseed meal (RSM) diet, fermented rapeseed meal (FRSM) diet (35% nitrogen(N) of basal diet were substituted by RSM or FRSM) and N-free diet. In order to evaluate the nutritional value of fermented rapeseed meal, the metabolic trial lasted for 7 days, the adaptation period was 3 days and the formal period was 4 days.All feces and urine were collected during formal period in order to determine the digestibility of nutrients. Results showed that:1)The pH of fermented rapeseed meal mixture decreased by 1.68 after fermentation, and the contents of crude protein(CP), water-soluble protein(WSP), acid-soluble protein(ASP) and crude fat(EE) increased by 1.91%, 52.88%, 44.40% and 24.27%, respectively; The contents of 17 amino acids were increased. The neutral detergent fiber(NDF) of FRSM decreased by 5.21%; Isothiocyanate(ITC) degradation rate was 92.20%, oxazolidinone(OZT) degradation rate was 100.00%; Tannin and phytic acid decreased by 35.81% and 24.22%, respectively. 2) The apparent digestibility of dry matter of FRSM was 75.28%, which was significantly higher than that of RSM (P<0.05);Digestible energy, nitrogen apparent (true) digestibility and nitrogen apparent (true) availability of FRSM were 13.84 MJ·kg-1, 70.89% (72.84%) and 68.12% (71.12%), respectively, which were all extremely significantly higher than those of RSM(P<0.01). The apparent digestibility of calcium, phosphorus and crude ash were not significant different between FRSM and RSM (P>0.05). 3) All amino acids (except cysteine) apparent (true) digestibility of FRSM were significantly or extremely significantly higher than those of RSM (P<0.05 or P<0.01). In summary, by solid state fermentation of RSM with two bacteria, the content of anti-nutritional factors were reduced, the nutrient digestibility and utilization rate of rapeseed meal were increased, and the feeding value of rapeseed meal was effectively improved in growing-finishing pigs.

Key words: fermented rapeseed meal, growing-finishing pigs, nutrient digestibility, nitrogen availability

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