China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (2): 559-568.doi: 10.16431/j.cnki.1671-7236.2022.02.017

• Nutrition and Feed • Previous Articles     Next Articles

Effects of Fermented Mixed Meal Replacing Soybean Meal in Diets on Growth Performance, Nutrient Apparent Digestibility and Serum Biochemical Indices of Beef Cattle

ZENG Yu1, LIU Yao1, LI Youying2, PENG Zhongli1, WU Huazhuo1   

  1. 1. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Conservation and Utilization, College of Animal & Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China;
    2. Institute of Animal Husbandry of Ganzi Autonomous Prefecture of Sichuan Province, Kangding 626000, China
  • Received:2021-07-27 Published:2022-01-27

Abstract: 【Objective】 This experiment was conducted to investigate the effects of different proportion of fermented mixed meal replacing soybean meal in diets on growth performance, nutrient apparent digestibility, serum biochemical indexes of beef cattle, in order to provide a reference data for applying fermented mixed meal in beef cattle production.【Method】 35 healthy Simmental crossbred cattle with an initial body weight of (480.71±45.65) kg were randomly divided into 5 groups, and were fed total mixed rations (TMR) which used fermented mixed meal replacing 0 (group Ⅰ), 25% (group Ⅱ), 50% (group Ⅲ), 75% (group Ⅳ), and 100% (group Ⅴ) soybean meal, respectively.The experiment lasted for 74 days, the first 14 days were the adaptation period, and the last 60 days were the trial period.Growth performance was detected at the end of experiment.Diet and fecal samples were collected for nutrient apparent digestibility determination at last 3 days of the experiment.20 mL blood samples were collected from the vein of five beef cattle in each group at the end of experiment, and the serum biochemical indices were tested by veterinary automatic biochemical analyzer.【Result】 ①With the increase of the ratio of fermented mixed meal replacing soybean meal, the ADG first increased and then decreased (P=0.096), the F/G of group Ⅲ and Ⅳ was significantly higher than that of group Ⅱ (P < 0.05), and group Ⅳ had the highest ADG and the lowest F/G.②As the replacement ratio of fermented mixed meal increasing, crude protein (CP), neutral detergent fiber (NDF), and acid detergent fiber (ADF) digestibility showed quadratic variation (P < 0.05).Compared with group Ⅰ-Ⅳ, the organic matter (OM) digestibility in group Ⅴ was significantly decreased (P < 0.05), and there was no significant difference in phosphorus (P) and calcium (Ca) digestibility among the five groups (P > 0.05).③The contents of urea nitrogen (UN) and the activity of alkaline phosphatase (ALP) in serum decreased linearly with the increase of the ratio of fermented mixed meal replacing soybean meal (P < 0.05), and the content of total cholesterol (TC) showed a tendency decreased linearly (P=0.098).④The unit price of feed in group Ⅰ-Ⅴ were 1.85, 1.84, 1.82, 1.81 and 1.80 yuan, respectively.The weight gain cost per kilogram of beef cattle was 7.09, 17.88, 15.32, 14.86 and 16.13 yuan, respectively.the gross profit per beef cattle in the whole experiment period was 702.07, 623.42, 954.21, 1 011.48 and 778.89 yuan, respectively.【Conclusion】 Under the conditions of this experiment, fermented mixed meal could completely replace soybean meal in diets and had no significant negative impact on growth performance and nutrient apparent digestibility of beef cattle, and 75% substitution in diets had the best effect on growth performance and economic benefits of beef cattle.

Key words: fermented mixed meals; soybean meal; beef cattle; growth performance; nutrient apparent digestibility; serum biochemical indices

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