famine
发表于 2025-3-30 12:08:57
Pathology,ral agent of the disease was isolated, during the 1960’s. Since then the main pathological events that occur during the development of MD have been elucidated (3), usually from studies on young genetically-susceptible chickens infected experimentally with pathogenic strains of MD virus (MDV). These events are described in this Chapter.
散布
发表于 2025-3-30 16:17:18
Book 1985 which killed one chicken in five, and which defied efforts to understand and control it for !lOre than 50 years, and one can begin to appreciate the interest Marek‘s disease has received. Canpound these characteristics with the finding of the causal herpesvirus, its recog nition as the neoplasm fi
Ige326
发表于 2025-3-30 20:16:27
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闯入
发表于 2025-3-31 00:33:13
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腼腆
发表于 2025-3-31 03:44:11
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Arb853
发表于 2025-3-31 06:57:26
Genetic Resistance, successful selection for important production traits (5). Other workers reported similar success in selection for resistance (7,8), and these early studies prompted some poultry breeders to develop their own resistant strains (9).
遗留之物
发表于 2025-3-31 10:40:08
,Spread of Marek’s Disease, and mortality may reach 80% of a flock. However, it is a characteristic of the disease that its incidence varies greatly in infected flocks, and between houses and pens within a house on a single site (6). These variations can be greater than 10-fold.