蛋鸡早期选种血液生化指标的研究

STUDY ON BLOOD BIOCHEMICAL INDICES OF EARLY SELECTION FOR LAYER

测定了8、12周龄S220母雏9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与300日龄产蛋量间的遗传相关为0.7945。8周龄血清碱性磷酸酶(AKP)活性与300日龄产蛋量间的遗传相关为0.8245。利用8周龄血清白蛋白百分含量和AKP活性作为辅助性状对300日龄产蛋量进行间接选择,其间接选择效率分别为个体选择的1.2174和1.4519倍,为家系选择的1.4460和1.4837倍,为合并选择的1.0826和1.1887倍。因此,8周龄血清白蛋白百分含量和AKP活性可作为蛋鸡早期选种的血液生化指标。

Nine blood biochemical indices of White Leghorn Line S220 chicks at age of 8 and 12 weeks were tested. The phenotypic and genetic correlations between these indices and egg laying performance as well as heritabilities of these indexes were estimated. The results showed that the heritabilities of both percentage content of serum albumin at 8-weeks (8-SAW) and of egg production at 300-days (300-EPD) and their genetic correlation were 0.54, 0.23 and 0.7945, respectively. The heritabilities of both serum AKP activity at 8-wk (8-SAAW) and of egg production at 300 -days(300-EPD)and their genetic correlation were 0.62, 0.20 and 0.8245, respectively. The efficiency of indirect selection to 300—EPD by 8—SAW and 8-SAAW as the secondary trait was 1.2174 and 1.4519, 1.4460 and 1.4873, 1.0826 and 1.1887 times as large as individual selection, family selection and combination selection, respectively. Hence, percentage content of 8-SAW and 8-SAAW can be regarded as blood biochemical indexes of layer for early selection.