ENDOGENOUS VIRAL GENES - ASSOCIATION WITH REDUCED EGG-PRODUCTION RATE AND EGG SIZE IN WHITE LEGHORNS

被引:51
作者
GAVORA, JS
KUHNLEIN, U
CRITTENDEN, LB
SPENCER, JL
SABOUR, MP
机构
[1] MCGILL UNIV,MACDONALD COLL,DEPT ANIM SCI,ST ANNE BELLEVUE H9X 1C0,QUEBEC,CANADA
[2] USDA ARS,REG POULTRY RES LAB,E LANSING,MI 48823
[3] AGR CANADA,ANIM DIS RES INST,NEPEAN K2H 8P9,ONTARIO,CANADA
关键词
ENDOGENOUS PROVIRUSES; CHICKENS; EGG PRODUCTION; EGG SIZE; BLOOD SPOTS;
D O I
10.3382/ps.0700618
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Endogenous viral (ev) genes are DNA sequences residing permanently in the genome of most chickens that have a high degree of homology to avian leukosis viruses (ALV). Association of ev genes with production trait differences was studied in White Leghorns free of exogenous ALV. The Cornell Strain K and S chickens used in Experiment 1 had multiple ev genes. In each of four lines of chickens in Experiment 2, there was a 1:1 segregation of full-sibs free of ev genes and those carrying one ev gene: ev-12 that produces the complete endogenous virus, ev-3 or ev-6 that express certain viral antigens, or ev-1, a silent gene. In Experiment 1, the presence of genes ev-10 or ev-19, known to produce the complete virus, was associated with a 9% reduction in the annual egg production rate (P < .05) in Strain S. Similarly, the presence of the virus-producing ev-12 in Experiment 2 was associated with an 8% reduction of annual egg production rate (P < .05), a 2.2-g reduction in egg weight (P < .01), and a .003 reduction in egg specific gravity (P < .01). No significant effects of ev genes on age at first egg, Haugh unit score, percentage of eggs with blood spots, and body weight of hens were observed. It was concluded that ev genes producing complete endogenous virus are associated with production trait differences similar to those associated with subclinical infections with exogenous ALV.
引用
收藏
页码:618 / 623
页数:6
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