摘要
The aim of this study was to evaluate the selection response on intramuscular fat (IMF) content of LM after 3 generations of divergent selection. Heritability and genetic means for IMF content were also analyzed. Selection was based on the phenotypic value of IMF content measured in 2 full sibs of the first parity. Selection pressure on females was 13% in the base generation and 26% for the next generations. Males were selected within sire families to reduce inbreeding. Line size was 13 males and 83 females in the base population and approximately 8 males and 40 females for high (High) and low (Low)lines in the next generations. A total of 668 records were used to estimate the selection response on IMF. The pedigree file used to estimate heritability and genetic means contained 1,332 animals. Data were analyzed using Bayesian methodology. Differences between lines for IMF were 0.08, 0.10, and 0.09 g/100 g muscle in the first, second, and third generation, respectively. These differences represent a direct and cumulative selection response of 9% of the mean, of which 6.8% was obtained in the first generation. Heritability of IMF content was moderate to high (0.37) with a probability of 97% of being greater than 0.20. The response to selection estimated using an animal model was 0.033, 0.052 and 0.054 g/100 g muscle in line High and –0.032, –0.046, and –0.051 g/100 g muscle in line Low in the first, second, and third generation, respectively. Results of the present experiment confirmed that IMF content can be improved through selection in rabbits.
摘要译文
本研究的目的是评估3代不同选择后LM肌内脂肪（IMF）含量的选择反应。还分析了IMF含量的遗传力和遗传方法。选择是基于在第一胎的2个完整同胞中测量的IMF含量的表型值。女性的选择压力在基础代中为13％，下一代为26％。在陛下家庭中选择男性以减少近亲繁殖。在下一代中，基线群体中的行数为13名男性和83名女性，大约8名男性和40名女性为高（高）和低（低）行。共有668条记录用于估计国际货币基金组织的选择反应。用于估计遗传力和遗传手段的谱系文件包含1,332只动物。使用贝叶斯方法分析数据。 IMF的线之间的差异分别为第一代，第二代和第三代中0.08,0.10和0.09g / 100g肌肉。这些差异代表了平均9％的直接累积选择反应，其中6.8％是在第一代获得的。 IMF含量的遗传度中等至高（0。37）概率为97％大于0.20。使用动物模型估计的对选择的响应是高线为0.033,0.052和0.054g / 100g肌肉，-0.032，-0.046和-0。在第一代，第二代和第三代分别为051克/ 100克肌肉低。本实验结果证实，通过兔子选择可以提高IMF含量。
C. Zomeño;P. Hernández;A. Blasco. Divergent selection for intramuscular fat content in rabbits. I. Direct response to selection[J]. Journal of Animal Science, 2013,91(9): 4526–4531