College of Animal Science and Technology, Gansu Agricultural University, Lanzhou, Gansu, China.
The State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu, China.
Anim Biotechnol. 2023 Dec;34(7):2805-2816. doi: 10.1080/10495398.2022.2119405. Epub 2022 Sep 8.
Increased body growth and feed efficiency are important for breeding due to expensive feed costs. This study estimated the genetic parameters for two feed efficiency traits [the feed conversion ratio (FCR) and the residual feed intake (RFI)] and other important economic traits in male Hu sheep using 1642 male Hu lambs. The heritability of the RFI was estimated at 0.31 (±0.10)-0.54 (±0.1) and the heritability of the FCR was 0.05 (±0.07)-0.77 (±0.12). There was a negative genetic correlation between rib-eye muscle area traits and RFI. A positive genetic correlation was found between fat deposition traits and feed efficiency traits. The digestive tract weight decreased with the direction of RFI: however, the FCR showed the opposite: A low FCR was accompanied by a high digestive tract weight. The genetic correlation between feed efficiency (RFI and FCR) and rumen weight was negative. Heritability estimates for feed efficiency generate fluctuations with different experimental intervals. The weight of other traits should be reasonably allocated to avoid losses in production and feed efficiency in the selection of feed efficiency traits. The present study added to our understanding of the genetic parameters of sheep under the condition of house feeding.
由于饲料成本高昂，增加体生长和饲料效率对繁殖很重要。本研究使用 1642 只雄性湖羊估计了两个饲料效率性状（饲料转化率（FCR）和剩余饲料摄入量（RFI））和其他重要经济性状的遗传参数。RFI 的遗传力估计值为 0.31（±0.10）-0.54（±0.1），FCR 的遗传力为 0.05（±0.07）-0.77（±0.12）。肋眼肌面积性状与 RFI 之间存在负遗传相关，脂肪沉积性状与饲料效率性状之间存在正遗传相关。消化道重量随 RFI 方向减少：然而，FCR 则相反：低 FCR 伴随着高消化道重量。饲料效率（RFI 和 FCR）与瘤胃重量之间的遗传相关性为负。饲料效率遗传力估计值随不同的实验间隔而波动。在选择饲料效率性状时，其他性状的权重应合理分配，以避免生产和饲料效率的损失。本研究增加了我们对舍饲条件下绵羊遗传参数的理解。
