Department of Animal and Dairy Science, University of Georgia, Athens, GA 30602-2771, USA.
J Anim Breed Genet. 2010 Jun;127(3):230-4. doi: 10.1111/j.1439-0388.2009.00833.x.
Genetic parameters for daily feed intake (DFI, g/day) and daily gain (DG, g/day) were estimated using records of 1916 Duroc boars from electronic feeder stations. Management was limited and resulted in varied ranges of age and weight on test. Boars were housed in 102 pens, each equipped with one feeder, and allowed ad libitum feeding. Weekly averages of DFI and DG were used due to large variation in daily records. Six traits were defined as DFI and DG during 85-106 (period 1), 107-128 (period 2) and 129-150 days of age (period 3). A six-trait model included age as a linear and a quadratic covariate for DFI and a linear covariate for DG with a fixed effect of year-week-pen and random effects of litter, additive genetic animal and permanent environmental animal. Variance components were estimated by a Bayesian approach using Gibbs sampling algorithm. Estimates of heritability for respective periods were 18%, 12% and 10% for DFI and 21%, 11% and 10% for DG. Genetic correlations between DFI and DG in the same period were 0.70, 0.73 and 0.32 for the respective periods. DFI and DG obtained from automatic feeders can be analysed to reveal variation across testing periods by using weekly averages when many monthly averages are incomplete.
利用来自电子饲料站的 1916 头杜洛克公猪的数据，估计了每日采食量（DFI，g/天）和日增重（DG，g/天）的遗传参数。管理受到限制，导致测试时体重和年龄的范围不同。公猪被安置在 102 个猪圈中，每个猪圈配备一个饲料器，并允许自由采食。由于每日记录的差异很大，因此使用每周平均 DFI 和 DG。定义了 6 个性状，即 85-106 天（第 1 期）、107-128 天（第 2 期）和 129-150 天（第 3 期）期间的 DFI 和 DG。六性状模型包括年龄作为 DFI 的线性和二次协变量，以及 DG 的线性协变量，具有年份-周-圈的固定效应和窝、加性遗传动物和永久环境动物的随机效应。方差分量通过贝叶斯方法使用 Gibbs 抽样算法进行估计。各个时期的遗传力估计值分别为 DFI 的 18%、12%和 10%，DG 的 21%、11%和 10%。同一时期 DFI 和 DG 之间的遗传相关性分别为 0.70、0.73 和 0.32。当许多月度平均值不完整时，使用每周平均值可以从自动饲料器中分析 DFI 和 DG，以揭示不同测试期间的变化。
