›› 2018, Vol. 45 ›› Issue (5): 1219-1225.doi: 10.16431/j.cnki.1671-7236.2018.05.012

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Effects of Concentrates with Different Energy Levels on Growth Performance and Plasma Biochemical Indices in Wagyu and Leiqiong Crossbreed Cattle

LI Yishu1, HOU Guanyu1, LIU Cheng2, ZHOU Xiong1, SHI Liguang1, ZHOU Hanlin1   

  1. 1. Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China;
    2. Experimental Farm of Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China
  • Received:2017-10-30 Online:2018-05-20 Published:2018-05-19

Abstract:

The objective of this study was to investigate the effect of concentrates with different energy levels on the growth performance and plasma biochemical indices in Wagyu×Leiqiong crossbreed cattle,and determine the optimized dietary component.42 15-month-old Wagyu×Leiqiong crossbreed bull were chosen and divided randomly into 3 groups,and cattle in groups Ⅰ,Ⅱ and Ⅲ were fed concentrates with different energy levels,of which the total net energy (NEmf) were 6.43,6.90 and 7.50 MJ/kg,respectively.The experiment lasted for 90 days, the body weight was measured every 30 d,and blood samples were collected and plasma biochemical indices were determined at the beginning and ending of the experiment.The results showed that:①The total weight gain of groups Ⅰ,Ⅱ and Ⅲ were 77.43,93.71 and 84.29 kg during the experimental period,respectively,and that of group Ⅱ was significant higher than group Ⅰ (P<0.05).The average daily gains (ADG) were 0.86,1.04 and 0.94 kg/d,the ADG of group Ⅱ was 20.9% (P<0.05),10.6%(P>0.05) higher than that of groups Ⅰ and Ⅲ,and there was no significant between groups Ⅲ and Ⅰ (P>0.05).②At the ending of the experiment,the contents of UREA,TP,ALB,LDH and ALP of 3 groups were not significantly different (P>0.05),but they all increased compared with those at the beginning.③The daily feeding cost was 13.440,14.000 and 14.685 yuan for each cattle of groups Ⅰ,Ⅱ and Ⅲ,and the cost of unit live weight gain was 15.63,13.46 and 15.68 yuan,respectively.The above results suggested that the optimized concentrates with 6.90 MJ/kg NEmf(group Ⅱ) obtained better effect on body gain and fattening benefits.

Key words: Wagyu crossbreed cattle; concentrate's energy level; fattening; growth performance; plasma biochemical indices

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