生长兔的基因型对生产性能的影响，特别关注高温下的剩余采食量。
Effect of genotype of growing rabbits on productive performance with special reference to residual feed intake at hot temperature.
作者信息
Fathi Moataz, Abdelsalam Magdy, Al-Homidan Ibrahim, Abou-Emera Osama, Rayan Gamal
机构信息
Department of Animal Production and Breeding, College of Agriculture and Veterinary Medicine, Qassim University, Buraydah, Al-Qassim 51452, Saudi Arabia.
Department of Poultry Production, Faculty of Agriculture, Ain Shams University, Hadayek Shoubra 11241, Cairo, Egypt.
出版信息
Anim Biosci. 2023 Jul;36(7):1067-1074. doi: 10.5713/ab.22.0355. Epub 2023 Feb 27.
OBJECTIVE
Better feed efficiency can be achieved by selecting rabbit genotypes with lower residual feed intake (RFI) under high ambient temperatures.
METHODS
Two genotypes of rabbits (Jabali, Saudi local breed and imported, Spanish V-line) were used to derive RFI and to investigate the relationship between RFI and productive traits. In total, 250 animals (125 each) were housed in individual wire mesh cages in a semi-closed rabbitry. Growth performance, feed criteria, carcass evaluation, biochemical blood analysis, and immune responses were determined.
RESULTS
Superiority in growth performance, feed efficiency, carcass characteristics, and cellular immunity was recorded in the Jabali breed compared to the V-line genotype. According to regression analysis, a significant effect of daily body weight gain was found, upon computing the expected feed intake in both genotypes. Moreover, mid-body weight0.75 had a significant effect only in the Jabali breed. Positive correlation coefficients between RFI and dry matter feed intake or feed conversion ratio were found. The same trend in this relationship between RFI and productive traits was observed in some cases for both genotypes. An opposite trend in correlations was observed in the studied genotypes for some traits.
CONCLUSION
The results suggest that the relationship between RFI and productive traits must be taken into consideration in rabbit breeding programs under the prevailing environment. However, further studies are required to investigate the effect of rabbit genotype and environmental factors on computing RFI.
目的
在高温环境下，通过选择残余采食量（RFI）较低的兔基因型可实现更好的饲料效率。
方法
使用两种基因型的兔子（Jabali，沙特本地品种和进口的西班牙V系）来计算RFI，并研究RFI与生产性状之间的关系。总共250只动物（每种125只）被饲养在半封闭兔舍的单个金属丝网笼中。测定生长性能、饲料标准、胴体评估、生化血液分析和免疫反应。
结果
与V系基因型相比，Jabali品种在生长性能、饲料效率、胴体特征和细胞免疫方面表现更优。根据回归分析，在计算两种基因型的预期采食量时，发现日体重增加有显著影响。此外，胴体中部体重0.75仅在Jabali品种中有显著影响。发现RFI与干物质采食量或饲料转化率之间存在正相关系数。在某些情况下，两种基因型在RFI与生产性状之间的这种关系上呈现相同趋势。在研究的基因型中，某些性状的相关性呈现相反趋势。
结论
结果表明，在当前环境下的兔子育种计划中，必须考虑RFI与生产性状之间的关系。然而，需要进一步研究来调查兔基因型和环境因素对计算RFI的影响。
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