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The Net Mineral Requirement for Maintenance and Growth of Dorper x Hu Ewe Lambs

The Net Mineral Requirement for Maintenance and Growth of Dorper x Hu Ewe Lambs

Hao Zhang,1,2,3,* Hai Tao Nie,3 Tie Wei Ma,3 Zi Yu Wang3 and Feng Wang3

1Laboratory of Metabolic Manipulation of Herbivorous Animal Nutrition, College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, P.R. China
2Joint International Research Laboratory of Agriculture and Agri-product Safety, Yangzhou University, Yangzhou 225009, P.R. China
3Jiangsu Engineering Technology Research Center of Mutton Sheep and Goat Industry, Nanjing Agricultural University, Nanjing 210095, P.R. China

*      Corresponding author: zhanghao_850220@126.com

 

ABSTRACT

A comparative slaughter trial was conducted to estimate the mineral concentrations and distributions in the main body tissues and the net requirements for maintenance and growth of F1Dorper × Hu ewe lambs. Thirty-five ewe lambs averaging 33.52±0.56 kg body weight (BW) were used. Seven ewe lambs were randomly chosen and slaughtered at 34.93 ± 0.37 kg BW as the baseline group for measuring initial body composition. Another seven lambs were also randomly chosen and offered a pelleted mixed diet (approximately concentrate : roughage = 60 : 40, DM basis) for ad libitum intake and slaughtered at 41.73 ± 0.53 kg BW. The remaining lambs (n = 21) were allocated randomly on d 0 to 3 treatment intake levels (treatments were ad libitum or restricted to 70 or 40% of the ad libitum intake) within 7 slaughter groups. A slaughter group contained 1 lamb from each treatment, and lambs were slaughtered when the ad libitum treatment lamb reached approximately 50 kg BW. Non-carcass components (head + feet, hide, internal organs + blood) and empty bodies of the lambs were weighed, ground, mixed, and subsampled for chemical analyses. The Ca, P, Na, and Mg were mainly distributed in bone, except for K, which was mainly distributed in the muscle tissues. The net macromineral requirements for maintenance were 20.20 mg Ca, 13.50 mg P, 3.80 mg Na, 7.91 mg K, and 1.10 mg Mg/kg empty body weight (EBW) for ewes. The net requirements for growth ranged from 11.79 to 12.06 g Ca, 6.04 to 6.16 g P, 1.66 to 1.74 g K, 0.40 to 0.42 g Mg, and 0.98 to 0.95 g Na /kg of EBW gain (EBWG) for ewes from 35 to 50 kg BW. These results for the mineral requirements may help to formulate more balanced diets for F1 Dorper × Hu ewe lambs in the growth phase of 35 to 50 kg BW.
 

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Pakistan Journal of Zoology

June

Vol. 50, Iss. 3, Pages 799-1198

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