Scientia Agricultura Sinica ›› 2015, Vol. 48 ›› Issue (24): 4979-4988.doi: 10.3864/j.issn.0578-1752.2015.24.012

• ANIMAL SCIENCE·VETERINARY SCIENCERE·SOURCE INSECT • Previous Articles     Next Articles

Effects of Weaning Stress on Growth Performance, Organ Development and Serological Parameters in Lambs

CHAI Jian-min1, WANG Hai-chao1, DIAO Qi-yu1, QI Min-li1, GUO Feng1,2, WANG Hai-chao3, ZHANG Nai-feng1   

  1. 1Feed Research Institute, Chinese Academy of Agricultural Sciences / Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Beijing 100081
    2College of Animal Science, Xinjiang Agricultural University, Urumqi 830052
    3 Jiaonan Dacun Animal Health and Product Quality Inspection Station, Qingdao 266400, Shandong
  • Received:2014-07-29 Online:2015-12-16 Published:2015-12-16

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Abstract: 【Objective】To investigate the effects of weaning time on growth performance, nutrient digestibility, organ development and serum parameters in Hu sheep lambs for confirming best weaning age, seventy-two lambs of Hu sheep were divided into four groups with similar birthday and birth weight with 16 lambs in each experimental group and 24 lambs in the control group（ER group. 【Method】The lambs in experimental groups were weaned at 10, 20 or 30 days of age (EW10, EW20, EW30 groups) by feeding milk replacer, and the lambs in control group were ewe-reared. The digestion trial was carried out within 10 days after the weaning day, and the growth performance, organs development, serum parameters were determined on 10th day after weaning day. At the same time, lambs in ER group were disposed uniformly. 【Result】 The statistical findings were as follows: (1) body weight and average daily gain in EW10 and EW30 but not EW20 were significantly lower than that in ER (P＜0.05; (2) the starter dry matter intake in EW10 and EW20 but not EW30 were significantly higher than that in ER (P＜0.05; (3) during the 10 days after weaning, nutrient digestibility of dry matter (DM) and organic matter (OM) in EW10 group showed no significant difference with ER group (P＞0.05), whereas nutrient digestibility of nitrogen (N), gross energy (GE), ether extract (EE), calcium (Ca) and phosphorus (P) in EW10 group was lower than that in ER group (P＜0.05); (4) in addition, the nutrient digestibility included DM, OM, N, GE, EE, Ca and P in EW20 and EW30 groups were significantly lower than ER (P＜0.05); (5) the ratio of organs to body weight between groups showed no significant differences except in the ratio of rumen weight to body weight between EW10 and ER (P＜0.05); (6) serum parameters showed no significant difference at day of weaning (P＞0.05). However, on the 10th day post-weaning, EW10 and EW30 had a significantly lower TP and ALB and a higher CORT than ER (P＜0.05), and (7) the TNF-α in EW10 were higher than ER. 【Conclusion】 Weaning at 20 days of age showed minimum weaning stress according to the performance of weaned lambs.

Key words: lambs, early-weaning ages, milk replacer, apparent digestibility, organs development, serological parameters

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