ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2013, Vol. 44 ›› Issue (10): 1609-1615.doi: 10.11843/j.issn.0366-6964.2013.10.014

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Effects of Different Dietary Protein and Fat Sources on Nutrient Digestibility and Nitrogen Metabolism of Female Blue Foxes during Fur Development Period

GENG Ye-ye1,2, GAO Zhi-guang1, YANG Fu-he3, LI Guang-yu3, GAO Xiu-hua2*   

  1. （1. Beihua University, Jilin 132013， China; 2. Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China； 3. Institute of Wild Economic Animal and Plant, Chinese Academy of Agricultural Sciences, Jilin 130112, China）
  • Received:2013-01-14 Online:2013-10-23 Published:2013-10-23

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Abstract:

The trial was conducted to evaluate the effects of different dietary protein and fat sources on nutrient digestibility and nitrogen metabolism of female blue foxes during fur development period. The animals were randomly assigned to four treatment groups with 10 females in each group. The randomization was based on age and initial body weight. The method of double-factor design is adopted. Two dietary protein sources were plant protein and animal protein (P plant and P animal ), two dietary fat sources were bean oil and lard (F plant and F animal), in four kinds of experimental diets. The trials of metabolism and nitrogen balance were used to analyse the digestibility of protein，digestibility of fat，nitrogen retention and protein biological value. The results showed as follows: digestibility coefficients of protein, ether extract, energy(P<0.01) and dry mass(P<0.05) in P plant group were significantly higher than that in P animal group, but nitrogen retention, net protein utilization and biological value of protein in P plant group were extremely significantly lower than that in P animal group(P<0.01); digestibility coefficients of protein, fat and energy in F animal group (lard group) were lower than that in F plant group (bean oil group), but lard could materially improve biological value of protein and materially reduce urinary nitrogen (P<0.01). In conclusion, nutrient digestibility of dietary plant protein source is higher, but biological value of protein is significantly lower than that of animal protein source. If feeding blue fox with plant protein mainly in practical production, it is should be considered the balance of amino acids. Fat digestibility of bean oil is higher, but lard can improve nitrogen metabolism and nitrogen retention. So the effect of production will be better when using mixed fat.

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