蛋白水平及Lys/Met配比对早期断奶藏羔羊肌肉组织学形态的影响  

DIETARY PROTEIN LEVEL AND LYS /MET AFFECT MORPHOLOGY OF MUSCLE TISSUE OF EARLY- WEANER TIBETAN LAMBS

作　　者：侯生珍[1] 吕凯[1] 王志有[1] 郭远玉[1] 梁晓兵[1] 

机构地区：[1]青海大学农牧学院,西宁810016

出　　处：《山东农业大学学报（自然科学版）》2013年第4期543-549,共7页Journal of Shandong Agricultural University：Natural Science Edition

基　　金：2012年国家科技部项目(2012GB2G200471);青海省2010年省校科技合作项目(2010-395-1)

摘　　要：本试验旨在研究不同蛋白质水平（高蛋白21．03％、中蛋白18．02％、低蛋白15．01％）和同一蛋白质水平下3个Lys／Met配比对早期断奶藏羔羊肌肉组织学形态的影响。试验选取55±2日龄断奶（体重10．85±0．65kg）藏羔羊98只，随机分为7组，每组14只，公母各半。分别饲喂不同蛋白水平和Lys／Met配比的羔羊早期断奶料，试验期20d。结果表明：藏羔羊早期断奶料蛋白质水平在15％-21％范围内，随蛋白水平提高，藏羔羊日增重增加，肌纤维直径和面积增大，肌纤维密度减小；18％和15％蛋白蛋白质水平下，适宜Lys／Met配比处理组的藏羔羊日增重均增加，肌纤维直径和面积增大，肌纤维密度减小，断奶料营养水平和日增重均与肌纤维直径和面积呈正相关，与肌纤维密度成负相关。结果提示：早期断奶料营养水平显著影响其肌纤维直径、面积和密度，高营养水平导致不同部位肌纤维直径和横截面积增大，而肌纤维密度下降，综合研究结果，藏羔羊早期断奶料蛋白水平为18％，Lys／Met配比为3．1：1较适宜。This experiment was conducted to study the effects of CP levels （high protein 21.03%, middle protein 18.02%, low protein 15.01% ）and 3 ratios of Lys/Met with same protein level on development of complex stomach in early - weaned Tibetan Iambs. A total of 98 early - weaned Tibetan Iambs [ （55 ±2） days old, （ 10.85 ± 0.65 ） kg] were randomly allocated into 7 groups with 14 lambs（ half males and half females）in each group, early -weaned Tibetan Iambs in each group were fed basal diets which CP levels and Lys/Met were different, the experiment lasted for 20 days. The results showed as follows： Dietary CP levels from 15% to21%, with the increasing of the CP levels, the daily gain, muscle fiber diameter and areas increased, the muscle fiber density decreased. Reasonable ratio of Lys/Met with the CP level was 18% and 15%, the daily gain, muscle fiber diameter and areas increased, but the muscle fiber density decreased, the nutrition level and daily gain were positively correlated with muscle fiber diameter and areas, and negatively correlated with muscle fiber density. It is conclu- ded that the nutrition levels of diets can influence the muscle fiber diameter, areas and density, high nutrition level can increase the the muscle fiber diameter and areas, decrease the muscle fiber density. Taking a wide view of the whole experiment, 18% protein with Lys/Met = 3.1：1 is the most reasonable nutrition level for early -weaned Tibetan Iambs.

关 键 词：营养水平 早期断奶 藏羔羊 肌纤维直径 肌纤维面积 肌纤维密度 

分 类 号：S826[农业科学—畜牧学]