ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2014, Vol. 45 ›› Issue (9): 1549-1554.doi: 10.11843/j.issn.0366-6964.2014.09.024

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Study on Energy Metabolic Rule of Chinese Holstein Heifer with 300-350 kg BW

GAO Yan-xia1,2,3，YU Zhi1，CAO Yu-feng1,2,3，LI Qiu-feng1,2,3，LI Jian-guo1,2,3*   

  1. (1.College of Animal Science and Technology，Agricultural University of Hebei，Baoding 071001，China;2.Research Center of Embryo Engineering Technology in Cattle and Sheep of Hebei，Baoding 071001，China;3.Cattle Science Institute，Agricultural University of Hebei，Baoding 071001，China)
  • Received:2014-01-20 Online:2014-09-23 Published:2014-09-23

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Abstract:

The objective of this study was to evaluate the effect of nutritional level of ration on the growth performance of Chinese Holstein heifer with body weight of 300-350 kg，to reveal metabolic rule of energy requirement.Twenty-one 10-month-old heifers ((307.67±2.99)kg of BW) were divided into 3 groups(A，B and C) in a randomized experiment design，each group was fed different diet consisted of concentrate，corn silage and Leymus chinensis.The DE and CP of group A,B and C were 10.98 MJ•kg-1 and 10.06%，11.43 MJ•kg-1 and 11.04%，11.90 MJ•kg-1 and 12.04%(DM basis)，respectively.The ADG of heifers in 3 groups reached 620.09，820.30 and 887.30 g•d-1，respectively.The apparent and metabolic digestibility of gross energy(GE) were 67.86% and 57.94%,respectively.Average digestibility for DE was 85.35%.The study showed models of DER and MER requirement of heifers were：DER（MJ•d-1）=0.730 14W0.75+44.38△W，MER（MJ•d-1）=0.616 90 W0.75+39.50△W，W is BW of heifers(kg)，△W is ADG(kg•d-1).

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