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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0390    [Accepted] Published online December 24, 2019.
Net micromineral requirements for maintenance and growth of ewe lambs at the latter fattening period
Ya Qian Jin1,2  , Na Ding1  , Xiao Gao Diao1  , Sheng Chen Yu1  , Jun Xing Zhao3,*  , Jian Xin Zhang1,* 
1College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi, 030801, China
2College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu, 225009, China
3Collaborative Innovation Center for Efficient and Safe Production of Livestock, Shanxi Agricultural University, Taigu, Shanxi, 030801, China
Correspondence:  Jun Xing Zhao,Email: tgzjx2018@126.com
Jian Xin Zhang, Tel: +86-18252713403, Fax: +86-0514-87971865, Email: 18252713403@163.com
Received: 6 May 2019   • Revised: 30 September 2019   • Accepted: 25 November 2019
The objective of this study was to investigate the net micromineral (Cu, Fe, Mn, Zn) requirements for maintenance and growth of Dorper × Jinzhong crossbred ewe lambs at their latter fattening period.
Thirty 1/2 Dorper × 1/2 Jinzhong crossed F1 ewe lambs (35 ± 0.5 kg of body weight, BW) were used and divided into five groups in a randomized design for a comparative slaughter trial. At the beginning of the experiment, six lambs were randomly selected and slaughtered at 35 kg BW to determine their initial body composition. When their BWs reached 43 kg, another six lambs fed ad libitum were slaughtered to serve as an intermediate slaughter group. The retained eighteen lambs were randomly distributed into three groups and offered one type of feed at 100%, 65% and 40% of the ad libitum intake. When the lambs fed ad libitum reached a BW of 50 kg, the three groups were slaughtered. The body composition (muscle, fat, bone, blood with viscera, skin, and wool) were weighted, ground, mixed, and subsampled for mineral content analysis.
The net maintenance requirements of Cu, Fe, Mn, and Zn were 0.017, 0.160, 0.004, and 0.067 mg/kg BW/d, respectively, and the net growth requirements per 100 grams of ADG (average daily gain) ranged from 0.48 to 0.51 mg of Cu, 2.63 to 2.17 mg of Fe, 0.12 to 0.15 mg of Mn, and 2.07 to 2.00 mg of Zn, respectively, for Dorper × Jinzhong crossed ewes from 35 to 50 kg BW.
Our results suggest that the micromineral requirements for both maintenance and growth of Dorper × Jinzhong crossbred ewe lambs were quite different from the recommendations of NRC (2007), except for Zn.
Keywords: Sheep; Micromineral Requirements; Maintenance; Growth; Comparative Slaughter

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