ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (2): 327-337.doi: 10.11843/j.issn.0366-6964.2018.02.012

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Effects of Dietary Fat Levels on Growth Performance and Serum Parameters of Early-weaned Male Twin Hu Lambs

LI Wen-juan, TAO Hui, ZHANG Rong, ZHANG Fan, XIE Biao, ZHANG Nai-feng, 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:2017-08-14 Online:2018-02-23 Published:2018-02-23

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Abstract:

This study aimed to investigate the effects of dietary fat levels on growth, body size, preweaning diarrhea and serum parameters of early-weaned male twin Hu lambs. Thirty pairs of heathy male twin Hu lambs weaned at 7 days of age were selected and randomly allotted to two groups according to the paired design. One group was fed normal fat level (NF) diet with milk replacer (EE:15%) and starter (EE:2.8%), and another group was fed high fat level (HF) diet with milk replacer (EE:27%) and starter (EE:5%). Milk replacer and starter were fed to lambs from weaning to 60 days of age. Then lambs in NF and HF groups were fed unified starter (US) from 60 to 120 days of age. Body weight of all lambs was measured before morning feeding, daily feed intake and diarrhea status were recorded; At 60, 90 and 120 days old, blood samples were collected from jugular vein before morning feeding, and the blood routine indices were determined.The results showed that:1) Body weight of lambs in HF group was significantly higher than that in NF group on 30,50, 90 and 120 days of age (P<0.05). The weaning BW of the lambs in the HF group tended to be higher than that in the NF group (0.05 < P < 0.10). From 7 to 60 days of age, average intake of milk replacer in HF group was significantly higher than that in NF group (P<0.05), but intake of starter, average daily gain and feed conversion ratio were not significant (P>0.05) between the two groups. From 60 to 90 days of age, the ADG and intake of starter of lambs in HF group were significantly higher than that in NF group (P<0.05). Feed conversion ratio of lambs in HF group was significantly lower than that in NF group(P<0.05). From 90 to 120 days of age, intake of starter of lambs in HF group was significantly higher than that in NF group (P<0.05), the feed conversion ratio of the lambs in the HF group tended to be higher than that in the NF group (0.05 < P < 0.10). During the whole experiment period, milk replacer and starter intake of lambs in HF group were significantly higher than that in NF group (P<0.05), but the ADG and feed conversation ratio were not significantly different (P>0.05) between the two groups. 2) The diarrhea rate before weaning in HF group tended to be lower than that in NF group (0.05 < P < 0.10). There was no significant difference in body size indices between the two groups(P>0.05). High fat diet can improve the growth performance of male twin Hu lambs before and after weaning. The high fat diet can reduce the diarrhea rate before weaning, and in the present experimental condition, high fat diet have less effect on serum parameters of male twin Hu lambs, which are all within permissible values by their autoregulation.

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