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杜洛克猪个体皮下背脂层与背最长肌肌内脂肪百分比之间的遗传和表型关系。

Genetic and phenotypic relationships between individual subcutaneous backfat layers and percentage of longissimus intramuscular fat in Duroc swine.

作者信息

Newcom D W, Baas T J, Schwab C R, Stalder K J

机构信息

Dept. of Animal Science, Iowa State University, Ames 50011, USA.

出版信息

J Anim Sci. 2005 Feb;83(2):316-23. doi: 10.2527/2005.832316x.

Abstract

Progeny (n = 589) of randomly mated Duroc pigs were used to determine the genetic and phenotypic relationships between individual s.c. backfat layers and i.m. fat percent (IMF) of the longissimus. Five days before slaughter, cross-sectional ultrasound images were collected at the 10th rib by a National Swine Improvement Federation-certified ultrasound technician using an ultrasound machine (Aloka 500 SSD) fitted with a 12-cm linear array transducer. Off-midline backfat (SBF) and loin muscle area (SLMA) were measured. Individual s.c. backfat layers were measured at the same location: outer (OBF), middle (MBF), and inner (IBF). Off-midline backfat (CBF) and loin muscle area (CLMA) were measured on the carcass 24 h postmortem. A slice from the 10th rib of the loin muscle was obtained for determination of IMF. Heritability estimates and genetic correlations were calculated fitting all possible two-trait animal models in MATVEC (Wang et al., 2003). The heritabilities for OBF, MBF, IBF, CBF, SBF, and IMF were 0.63, 0.45, 0.53, 0.48, 0.44, and 0.69, respectively. The genetic correlations of OBF, MBF, and IBF with IMF were 0.36, 0.16, and 0.28, respectively, and the genetic correlations of CBF and SBF with IMF were 0.25 and 0.27, respectively. Genetic correlations between OBF and MBF, OBF and IBF, and MBF and IBF were 0.43, 0.45, and 0.67, respectively. Results demonstrate that individual backfat layers are highly heritable, of similar magnitude to total backfat, and have similar genetic correlations with IMF. Individual backfat layers could become candidate traits for implementation into a multiple-trait genetic evaluation to improve IMF, while minimizing the detrimental effect on total backfat depth.

摘要

随机交配的杜洛克猪的后代(n = 589)用于确定个体皮下背膘层与背最长肌肌内脂肪百分比(IMF)之间的遗传和表型关系。屠宰前5天,由美国国家种猪改良联合会认证的超声技术人员使用配备12厘米线性阵列换能器的超声仪(Aloka 500 SSD)在第10肋处采集横断面超声图像。测量离中线背膘(SBF)和腰肌面积(SLMA)。在同一位置测量个体皮下背膘层:外层(OBF)、中层(MBF)和内层(IBF)。在宰后24小时测量胴体的离中线背膘(CBF)和腰肌面积(CLMA)。从第10肋处的腰肌获取一片用于测定IMF。在MATVEC中拟合所有可能的双性状动物模型计算遗传力估计值和遗传相关性(Wang等人,2003)。OBF、MBF、IBF、CBF、SBF和IMF的遗传力分别为0.63、0.45、0.53、0.48、0.44和0.69。OBF、MBF和IBF与IMF的遗传相关性分别为0.36、0.16和0.28,CBF和SBF与IMF的遗传相关性分别为0.25和0.27。OBF与MBF、OBF与IBF以及MBF与IBF之间的遗传相关性分别为0.43、0.45和0.67。结果表明,个体背膘层具有高度遗传性,与总背膘的程度相似,并且与IMF具有相似的遗传相关性。个体背膘层可以成为用于多性状遗传评估以改善IMF同时最小化对总背膘深度不利影响的候选性状。

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