ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (6): 1170-1179.doi: 10.11843/j.issn.0366-6964.2016.06.012

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Effects of Protein Levels on Nutrient Digestion and Metabolism and Serum Parameters of Early-weaned Male Hu Twin Lambs

WANG Bo,CHAI Jian-min,WANG Hai-chao,CUI Kai,QI Min-li,ZHANG Nai-feng,TU Yan,DIAO Qi-yu*   

  1. (Key Laboratory of Feed Biotechnology of the Ministry of Agriculture,Feed Research Institute,Chinese Academy of Agricultural Sciences,Beijing 100081,China)
  • Received:2015-06-29 Online:2016-06-23 Published:2016-06-23

Abstract:

This study aimed to investigate the effects of low protein level and protein compensation on growth performance,nutrients apparent digestibility and metabolism and serum indices of male Hu twin lamb.Sixteen pairs of male Hu twin lambs weaned at day 15 after birth were selected and randomly divided into 2 treatments by paired design.One group was fed normal protein level milk replacer (CP:25%) and starter (CP:21%) as normal protein(NP) group,the other group were fed equal energy but lower protein milk replacer (CP:19%) and starter (CP:15%) as low protein(LP) level group.Milk replacer and starter were fed from wean to day 60.NP and LP groups were fed starter with 21% protein from day 60 to 90.The results showed as follows:body weight of lambs in LP group was significantly lower than that in NP group from day 30 to 90 (P<0.05).Crude protein apparent digestibility and retain nitrogen in LP group were significantly lower than that in NP group (P<0.05),but nitrogen metabolism rate was higher than that in NP group (P<0.05) from day 50 to 60.Crude fat apparent digestibility and nitrogen metabolism rate of LP group were obviously higher than NP group (P<0.05) from day 80 to 90.At the day of 60,blood urea nitrogen (BUN) concentration and insulin growth factor-Ⅰ in LP group were lower than that in NP group (P<0.05),but the activity of alkaline phosphatase (ALP) and glutamic-pyruvic transaminase (ALT) were much higher than that in NP group (P<0.05).At 90 days,ALP and ALT activity and growth hormone (GH) level were higher in LP group than that in NP group (P<0.05).In conclusion,during the lactation period,low protein level ration reduced the body weight of lambs,decreased the level of BUN and IGF-Ⅰand apparent digestibility of CP,whereas the N metabolism rate increased.And the body weight of lambs in LP group can not reach the normal weight after 30 days protein compensation.

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