利用雏鸡血液生化指标对蛋鸡进行早期选种的研究

本研究分别测定了246只8周龄、270只12周龄S220母雏6项血液生化指标,估测其遗传力及其与产蛋性能间的表型相关和遗传相关。结果表明,8周龄血清白蛋白百分含量遗传力为0.54,300日龄产蛋量遗传力为0.23,两者间的遗传相关为0.7945。利用8周龄血清白蛋白百分含量作为辅助性状对300日龄产蛋量进行间接选择,其间接选择效率为个体选择的1.2174倍,为家系选择的1.4460倍,为合并选择的1.0826倍。因此,8周龄血清白蛋白百分含量可作为蛋鸡早期选种血液生化指标之一。

STUDY ON EARLY SELECTION FOR LAYER BY BLOOD BIOCHEMICAL INDEXES OF CHICKS

The six blood biochemical indexes of 246 at age of 8 -weeks and 270 of 12-weeks White Leghorn Line S220 chicks were tested in this paper. The phenotypic and genetic correlations between these indexes and egg layjng performances as well as heritabilities of these indexes were estimated. The results showed that the heritabilities both of percentage content of serum albumin at 8 -weeks ( 8 -SAW ) and of egg production at 330-days ( 300-EPD ) and their genetic correlation were 0.54, 0.23 and 0.7945, respectively. The efficiency of indirect selection of 300-EPD by 8-SAW as the secondary trait was 1.2174, 1.4460 and 1.0826 times as large as individual selection, family selection and combination selection, respectively. Hence, 8-SAW can be regarded as one of blood biochemical indexes of layer for early selection.