共查询到20条相似文献,搜索用时 109 毫秒
1.
2.
3.
4.
羔羊早期断奶是利用羔羊代乳料代替母乳,人为缩短母乳哺乳时间。通过实施早期断奶,可促进羔羊生长,提高母羊生产力,获得更高的生产效益。文章就羔羊早期断奶时间、羔羊代乳料的研究现状、早期断奶应注意的问题几方面进行综述,以期为日后羔羊早期断奶技术的研究和生产实践提供参考。 相似文献
5.
张万明 《青海畜牧兽医杂志》2013,43(2):60
传统的羔羊断奶时间一般为4月龄。据试验报道,羔羊60日龄和90日龄断奶。断奶后在同样的饲养管理条件下进行育肥至6月龄,二者的平均体重和日增重基本接近,差异不显著。这说明羔羊早期2月龄断奶切实可行。羔羊早期断奶育肥,有利于母羊抓 相似文献
6.
7.
8.
9.
<正>羔羊超早期断奶技术,是指将羔羊传统断奶时间由2月龄提前到3~7日龄,成功与否取决于人工哺乳技术水平。羔羊超早期断奶是肉羊集约化生产的一项新技术,目前多限于全舍饲条件下 相似文献
10.
11.
[目的] 研究早期断奶对藏西北绒山羊背最长肌中氨基酸和脂肪酸含量的影响。[方法] 将18只健康羔羊按照体重相近原则随机分为试验组和对照组,试验组在28日龄(D28)实施早期断奶,对照组在60日龄(D60)自然断奶,羔羊断奶后饲喂相同的代乳料至75日龄;从两组随机选取5只羔羊进行屠宰采样,对其背最长肌中氨基酸和脂肪酸指标进行测定分析。[结果] 在藏西北绒山羊背最长肌中检测出17种氨基酸,包括赖氨酸、亮氨酸等7种必需氨基酸,天冬氨酸、精氨酸等10种非必需氨基酸。两组断奶羔羊肉中总氨基酸含量、必需氨基酸含量、非必需氨基酸含量均无显著差异(P>0.05),28日龄断奶组羔羊肉中EAA/TAA、EAA/NEAA比值显著(P<0.05)高于60日龄断奶羔羊。共检测出29种饱和脂肪酸、不饱和脂肪酸,以棕榈酸和油酸含量最高,早期断奶对羔羊肉中饱和脂肪酸含量、单不饱和脂肪酸含量以及多不饱和脂肪酸含量影响不显著(P>0.05)。[结论] 藏西北绒山羊羔羊肉中所含氨基酸和脂肪酸种类多、含量丰富,实施早期断奶、及早补充颗粒料对肉中脂肪酸和氨基酸含量无影响,且可提高EAA/TAA、EAA/NEAA比值,使其更符合FAO/WHO氨基酸评分模式;该试验可为藏西北绒山羊羔羊实施早期断奶、提高母羊的繁殖率提供参考。 相似文献
12.
选择巴音布鲁克羊健康羔羊20只,分别在40和60日龄实施早期断奶,同时饲喂2种不同粗蛋白质水平(20%、22%)的代乳料,测定血清中生长类激素水平,研究早期断奶对羔羊生长的影响。试验分为4个试验组(A、B、C、D组,2种断奶日龄分别对应2种粗蛋白质水平代乳料)和1个对照组(哺乳羔羊)。结果表明:①平均日增重,试验组羔羊均高于对照组,其中饲喂22%CP代乳料的2种断奶日龄组显著高于对照组(P0.05);22%CP的2组平均日增重显著高于20%CP的2组(P0.05);同一营养水平的代乳料,2种断奶日龄间平均日增重无显著差异。②血清中4种生长类激素的水平,试验组羔羊血清中IGF-Ⅰ、INS水平均高于对照组,其中B组(40日龄断奶,22%CP)IGF-Ⅰ显著高于对照组(P0.05);B、D组(22%CP)INS显著高于对照组(P0.05);B组IGF-Ⅰ显著高于A、C、D组(P0.05)。试验组羔羊血清中T3、T4浓度与对照组无显著差异(P0.05)。因此,本试验条件下,巴音布鲁克羊羔羊40和60日龄断奶可行,且以饲喂粗蛋白质水平为22%的代乳料效果较好。 相似文献
13.
介绍了鄂尔多斯细毛羊妊娠母羊的饲养管理技术、接羔保育技术和羔羊的断奶技术。通过上述各项技术措施的应用和实施,不但提高了羔羊的日增重,又大大降低了羔羊的死亡率和鄂尔多斯细毛羊的不合格率,同时也提高了鄂尔多斯细毛羊母羊的繁殖率,既保证了鄂尔多斯细毛羊产业的生产水平和鄂尔多斯细毛羊的繁育,又使鄂尔多斯细毛羊的生长繁殖能完整准确地体现出遗传基因的表型性状,以便于选育提高,为做大做强鄂尔多斯细毛羊产业奠定了坚实的基础。 相似文献
14.
15.
酶制剂在早期断奶仔猪日粮中的应用进展 总被引:1,自引:0,他引:1
本文根据早期断奶仔猪的消化生理特点,综述了日粮中添加酶制剂对早期断奶仔猪日增重、腹泻率和饲料转化率等生产性能的影响及使用中应注意的问题,为生产中顺利实施早期断奶计划,不断提高养猪业经济效益提供有益的参考资料。 相似文献
16.
17.
The 4 yr productivity of 25% (QF; n = 533) and 50% (HF; n = 531) Finnsheep ewes exposed to either Suffolk or Columbia rams in one of three production systems was monitored to test the effects of system, terminal sire breed, maternal line, and their interactions on annual market lamb production. Ewe lambs and yearlings were randomly assigned to either a high-input accelerated lambing system (HIGH), a high-input annual system (MED), or a low-input annual system (LOW). Nursery facilities were available for weak lambs or those born in triplet or more births for the HIGH and MED but not for the LOW systems. Accelerated lambing protocol required early weaning. Sex-adjusted lamb weaning weights were corrected to within-system mean ages of 42 d for HIGH and 70 d for MED and LOW. The HIGH ewes weaned 1.55 lambs per year compared with 1.46 for MED and 1.18 for LOW (P less than .01). However, because of early weaning, HIGH yielded the lowest weight of weaned lamb per year. The MED ewes weaned 5.9 and 11.1 more kilograms of lamb per year than the LOW and HIGH ewes, respectively (P less than .01). The HIGH system may be economically feasible if young lambs could be inexpensively grown to feeder or market lamb weight. The HIGH ewes did not, however, increase lamb numbers in proportion to increased exposures compared with the annual systems. Breed-group effects for ewe productivity (kilogram of lamb weaned per ewe per year) were consistent across management systems, although some interactions among breed group and system were present for components of productivity. Suffolk rams yielded an advantage of 1.6 kg of weaned lamb per exposure over Columbia rams (P less than .05) due to a 3% better lamb survival (P less than .01) and heavier weaning weight, especially in the LOW system. The HF ewes weaned .1 more lambs per exposure than QF ewes (P less than .01); .06 of the lambs were nursery-reared. However, lambs from HF ewes had a 2% lower survival rate (P less than .05) and were 1.4 kg lighter at weaning (P less than .01), so overall productivity among HF and QF ewes was similar. 相似文献
18.
GUO Jiang-peng WANG Jun LI Fa-di LI Hai-jing MA Teng QI Zhi-guo HAO Zheng-li CHEN Jing-yuan 《中国畜牧兽医》2017,44(9):2603-2612
The objective of this study was to determine the effects of different weaning ages on pH and the main digestive enzymes activities in the small intestinal contents of lamb. Fifty-five male lambs of Gansu modern breeding sheep group with(3.43±1.15)kg initial body weight were divided into 3 treatments randomly that were control group (sucking,25 lambs), group Ⅰ (weaning at 28 days old, 15 lambs), and group Ⅱ(weaning at 42 days old,15 lambs).5 lambs from each group were slaughtered at 12 h,7 d and 14 d after weaning,respectively,and the the change of pH and activities of α-amylase,trypsin,chympotrypsin and lipase were measured in the small intestinal contents. The results showed that the effects of pH and the main digestive enzymes activities could be expressed sensitively in the contents of duodenum. From duodenum to ileum,the effects of weaning turned weakening gradually,and it did not show a high-impact on pH,trypsin and lipase activities. There was no significant influence in the recovery time to the normal levels of the main digestive enzymes activities in the small intestinal contents by different weaning ages,the recovery time of α-amylase in group Ⅰ was shorter than group Ⅱ. In this trail condition,it was feasible to wean at 28 days of age,and it had no significant difference in the recovery ability of main digestive enzymes in the small intestinal contents weaning at 28 and 42 days old. 相似文献
19.
为研究早期断奶日龄对羔羊小肠各段pH及主要消化酶活性的影响,选用55只初生重为(3.43±1.15)kg的甘肃现代肉羊育种群哺乳公羔,按同质原则分成3组,即对照组(正常吮乳组,25只)、Ⅰ组(28日龄断奶组,15只)和Ⅱ组(42日龄断奶组,15只)。在断奶12 h、7 d和14 d后从每个处理中随机抽取5只羔羊屠宰,测定小肠各段pH、α-淀粉酶、胰蛋白酶、糜蛋白酶和脂肪酶活性变化。结果显示,十二指肠食糜能够更为敏感地表达断奶对小肠pH及主要消化酶活性的影响。从小肠近端至远端,断奶对各肠段内容物pH及主要消化酶活性的影响逐渐减弱;断奶对小肠内容物pH、胰蛋白酶活性和脂肪酶活性影响较小;断奶日龄对羔羊小肠主要消化酶活性恢复所需要的时间影响不大,28日龄断奶组小肠α-淀粉酶活性恢复时间较42日龄断奶组短。本试验条件下,对羔羊实施28日龄断奶可行,且羔羊小肠主要消化酶活性恢复能力不逊于42日龄断奶羔羊。 相似文献
20.
本研究基于Meta分析评估早期断奶对羔羊生长性能的影响。采用计算机检索数据库辅助手动搜索文献,按文献排除标准共纳入30篇文献,试验组为994头早期断奶羔羊,对照组为539头随母哺乳羔羊,以肉羊60日龄体重和胸围作为生长性能指标,分别收集了1413只肉羊体重数据和1011只肉羊胸围数据,通过回归分析后亚组分析解释异质性来源,敏感性分析评价合并效应量后结果稳定性,漏斗图评估文献发表偏倚。Meta分析结果表明:早期断奶对羔羊60日龄体重无不良影响(P=0.225),回归分析发现,早期断奶对羔羊60日龄体重的影响与断奶日龄有关,与随母哺乳羔羊相比,羔羊30~40日龄断奶补饲能显著提高60日龄体重(P<0.001)。早期断奶对羔羊60日龄胸围无显著影响(P=0.282)。敏感性分析显示分析结果稳定可信,漏斗图显示纳入的文献存在一定的发表偏倚。 相似文献