ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (12): 2430-2440.doi: 10.11843/j.issn.0366-6964.2016.12.013

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Distributions of Cu, Fe, Mn, Zn and the Net Requirements for Maintenance and Growth of Dorper × Jinzhong Crossbred Ram Lambs at 35-50 kg

JIN Ya-qian, LIU Wen-zhong, REN You-she, ZHANG Chun-xiang, ZHAO Jun-xing, MA Xue-hao, ZHANG Jian-xin*   

  1. (College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu 030801,China)
  • Received:2016-07-11 Online:2016-12-23 Published:2016-12-23

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Abstract:

This experiment was conducted to estimate distributions of Cu, Fe, Mn, Zn and the net requirements for maintenance and growth of Dorper × Jinzhong crossbred ram lambs at 35-50 kg. A total of 30 ram lambs were used in this experiment. A comparative slaughter trial was carried out, and 6 lambs were randomly chosen and slaughtered at approximately 35 kg BW as the baseline group for measuring initial body composition. Another 6 lambs were also randomly chosen and offered a pelleted mixed diet for ad libitum intake and slaughtered at approximately 43 kg BW. The remaining 18 lambs were equally assigned to 3 groups in a randomised design according to the level of dry matter intake (ad libitum or 65% or 40% of ad libitum intake of the same diet), the 3 groups were slaughtered when the sheep fed ad libitum reached approximately 50 kg BW. The contents of Cu, Fe, Mn and Zn in different tissues, including muscle, adipose, bone, blood+visceral, leather and wool, were measured; mathematical model for analyzing distributions of trace element in tissues and predicting trace element requirements for maintenance and growth were established. The results showed that the growth rate of bone, muscle and fat decreased, decreased and increased, respectively. Cu, Fe Mn were mainly stored in viscera, accounting for 86.34%, 49.12%, 68.65% of the total contents in body, while Zn was mainly stored in muscle and bone, accounting for 42.17%, 24.19% of the total contents in body. The net requirements for maintenance of Cu, Fe, Mn, Zn expressed as empty body weight (EBW) were 0.016, 0.281, 0.007 and 0.085 mg•kg-1 EBW•d-1, and expressed as body weight (BW) were 0.013, 0.228, 0.006 and 0.069 mg•kg-1 BW•d-1, respectively. Net requirements for growth expressed as empty body weight (EBW) were 12.61-15.62, 77.82-82.55, 2.74-3.45 and 25.36-23.98 mg•kg-1 EBW, and expressed as body weight (BW) were 10.17-12.75, 62.76-67.39, 2.21-2.82 and 20.45-19.57 mg•kg-1 BW, respectively. The net requirements for maintenance of trace element in this study were higher than that recommended by NRC, excepted for Zn; net requirements for growth of Fe and Zn were similar with the recommendation of NRC, while requirements of Cu and Mn were higher than the recommendation.

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