China Animal Husbandry and Veterinary Medicine ›› 2024, Vol. 51 ›› Issue (4): 1448-1455.doi: 10.16431/j.cnki.1671-7236.2024.04.013

• Nutrition and Feed • Previous Articles    

Effect of High Concentrated of Rumen Protected Fat on Glucose and Insulin Tolerance in Sheep

XU Tiantian1,2, HU Fan2, WANG Xue3, WU Zhiwu2, YE Bingsen2, WEI Lingyun1, HE Zhixiong2, TAN Zhiliang2   

  1. 1. School of Environmental Ecology and Biological Engineering, Wuhan Institute of Technology, Wuhan 430205, China;
    2. Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
    3. School of Life Science and Engineering, Shenyang Institute of Technology, Shenyang 113122, China
  • Received:2023-09-01 Published:2024-03-27

Abstract: 【Objective】 The purpose of this study was to explore the effects of high dose of rumen protected fat (RPF) on the growth performance, glucose dynamics and insulin resistance of sheep,so as to provide a scientific basis for the efficient utilization in ruminant nutrition.【Method】 A total of 160 3-months Hulunbuir sheep were selected and divided into 2 groups with 4 pens per group and 20 sheep per pen,which were named HF (23.65% RPF,16.34% corn) and CON (without RPF,36.95% corn) groups.The pre-feeding period of the feeding experiment was 14 days,and the experimental period was 42 days.The feed intake were recorded daily and the body weight of the sheep were measured every 21 days, and the average daily feed intake (ADFI), average daily gain (ADG) anf feed to gain ratio (F/G) were calculated. At the last day of the feeding period,4 sheep were randomly selected from different pens in each group,and they were subjected to intravenous glucose tolerance test (IVGTT),according to 0.25 g/kg BW,50% glucose solution was injected into the jugular vein.The serum from jugular vein blood was collected to measure the concentration of blood glucose and insulin,and the area under curve,maximum concentration,maximum concentration variation,insulin resistance index (HOMA-IR and Matsuda index) were calculated.【Result】 The ADFI and F/G of sheep in the HF group were significantly lower than those in CON group (P<0.05).During the IVGTT,the serum glucose concentration of sheep in HF group at 2,10,30 min,and area under curve of glucose during the test were significantly lower than those in CON group (P<0.05).The highest glucose concentration of sheep in HF group was obviously lower than that in CON group (P<0.05).The insulin concentration at 10 and 30 min,and area under curve of insulin at 60 min in HF group were significantly lower than those in CON group (P<0.05).The Matsuda index of HF group was obviously higher than that of CON group (P<0.05).【Conclusion】 Adding high-concentration of RPF in the diet of growing sheep would not affect the growth performance of sheep, while could decrease the serum glucose concertration, and improve insulin sensitivity.

Key words: Hulunbuir sheep; rumen protected fat; glucose tolerance; insulin resistance

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