饲粮能量和蛋白质水平对21～60日龄湖羊生长、消化性能及血清指标的影响

doi:10.11843/j.issn.0366-6964.2019.01.013

摘要/Abstract

摘要：

旨在研究饲粮能量和蛋白质水平对21~60日龄湖羊羔羊生长、消化性能和血清指标的影响。本研究采用两因素两水平试验设计，选取64只17日龄体重相近、健康的湖羊羔羊，随机分为高能高蛋白（HE-HP）、高能低蛋白（HE-LP）、低能高蛋白（LE-HP）、低能低蛋白（LE-LP）4组，每组4个重复，每重复4只羊。试验预试期3 d，21日龄起所有羔羊断母乳，饲喂代乳粉、补饲开食料。正试期40 d。每天记录羔羊采食量，每隔20 d晨饲前称重、颈静脉采血测定血清指标；31~40和51~60日龄期间采用全收粪法进行消化试验。结果表明：1）饲粮能量与蛋白水平对羔羊生长性能无显著交互作用（P>0.05），但羔羊日增重与饲料转化效率均随饲粮能量或蛋白质水平的降低而显著降低（P<0.05）。2）饲粮能量和蛋白质水平对羔羊31~40日龄干物质和总能消化率存在显著交互作用（P<0.05），表现为饲喂高能量饲粮时羔羊对饲粮干物质和和总能消化率随蛋白质水平的降低而显著降低（P<0.05）。3）40日龄羔羊血清葡萄糖含量随能量水平降低而显著降低（P<0.05）；60日龄时，降低蛋白质水平显著降低了羔羊血清尿素氮含量（P<0.05）、提高了血清生长激素含量（P<0.05），降低饲粮能量水平显著提高了血清尿素氮和三酰甘油含量（P<0.05）。综上所述，能量和蛋白质水平对21~60日龄羔羊生长性能有显著影响，适当的能量和蛋白水平能够改善羔羊生长和消化性能。

Abstract:

The aim of this research was to assess the effects of dietary protein and energy levels on the growth, digestion performance and serum biochemical indexes of 21-60 days old Hu sheep lambs. In a 2×2 factorial design arrangement, sixty-four healthy Hu sheep lambs with similar body weight and birth date were assigned to 4 groups, including high energy-high protein (HE-HP), high energy-low protein (HE-LP), low energy-high protein (LE-HP) and low energy-low protein (LE-LP) groups. Each group had 4 replicates with 4 lambs in each replicate. After a three-day adaptation period, all lambs were weaned and fed with milk replacer and starter. The trial lasted for 40 days. The feed intake of lambs were recorded every day. The body weight was measured and blood samples were collected before morning feeding every 20 days. The digestibility tests were carried out from 31 to 40 and 51 to 60 days of age. The results showed that:1) There was no significant interaction between energy and protein levels on growth performance of lambs (P>0.05), but the ADG and feed conversion efficiency significantly decreased with the decrease of dietary protein or energy levels (P<0.05). 2) There was an significant interaction between energy and protein levels on the digestibility of DM and total energy in lambs from 31 to 40 days of age(P<0.05). Specifically, fed with the high energy diet, the digestibility of DM and total energy of lambs significantly decreased with the decrease of protein levels (P<0.05). 3) The serum glucose concentration significantly decreased with the decrease of dietary energy level for 40 days old lambs (P<0.05). At 60 day, decreased the protein levels significantly decreased the serum urea nitrogen content(P<0.05) and significantly increased the serum GH content (P<0.05), decreased the energy levels significantly increased the serum urea nitrogen content (P<0.05) and triglyceride content(P<0.05). In summary, dietary energy and protein levels can affect the growth performance of lambs from 21 to 60 days old, appropriate dietary energy and protein levels should be provided to guarantee the digestion and growth of lambs.

中图分类号:

S826.5

黄文琴, 祁敏丽, 吕小康, 崔凯, 王世琴, 刁其玉, 张乃锋. 饲粮能量和蛋白质水平对21～60日龄湖羊生长、消化性能及血清指标的影响[J]. 畜牧兽医学报, 2019, 50(1): 105-114.

HUANG Wenqin, QI Minli, Lü Xiaokang, CUI Kai, WANG Shiqin, DIAO Qiyu, ZHANG Naifeng. Effects of Dietary Energy and Protein Levels on the Growth, Digestion Performance and Serum Indexes of 21-60 Days Old Hu Sheep Lambs[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2019, 50(1): 105-114.

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