Disease profile in pure line layers in an organised farm

S.R. Sharma, G. Shyam Sunder and R.P. Sharma
Project Directorate on Poultry Rajendranagar, Hyderabad - 500 030

The post-mortem data from 1233 pure line layers, of all age groups, was analyzed for the disease profile in Anand, IWH, IWI and IWK strains. In all layer strains, a total of 30 different causes of death were recorded. The overall incidence of major causes/diseases/disease conditions viz. weakling/emaciation/stunting, Marek’s disease, heat-prostration, visceral gout/dehydration, cold exposure/pneumonia/sacculitis, colibacillosis, hepatitis, peritonitis, cannibalism, lameness and smothering/heart rupture was 28.1, 9.3, 8.7, 8.6, 7.6, 5.9, 3.9, 3.5, 3.4, 3.1 and 3.1%, respectively. Ascites, cloacal prolapse, lameness, lymphoid leukosis and yolk peritonitis were also recorded in all layer strains. Strain-wise analysis revealed 25 diseases/disease conditions in Anand and major causes of death were weakling/emaciation/stunting (28.3%), cold exposure/pneumonia/sacculitis (10.1%), Marek’s disease (9.3%), visceral gout/dehydration (8.5%), colibacillosis (7.4%), heat prostration (4.7%), yolk peritonitis (3.9%) and necrotic dermatitis (1.9%). Cannibalism, in Anand, with incidence of 6.6% was highest among all layer strains. In IWH strain, an incidence of heat prostration (10.5%) and Marek’s disease (13.7%) was highest among all layer strains indicating more susceptibility of the strain to these conditions. Other major causes of death were weakling/emaciation/stunting (29.6%), visceral gout/dehydration (10.8%), colibacillosis (5.4%), and cold exposure/pneumonia/sacculitis (4.5%). About 25% deaths were due to 18 other diseases/disease conditions.

In IWI strain, weakling/emaciation/stunting (32%) and omphalitis (3.5%) caused more than 1/3 rd of deaths and had highest incidence among different layer strains. Remaining 2/3 rd of deaths were due to 24 different causes and significant one were cold exposure/pneumonia/sacculitis (10.8%), heat prostration (10%), Marek’s disease (6.6%), visceral gout/dehydration (6.2%), hepatitis (4.6%), yolk peritonitis (3.5%), colibacillosis (3.5%) and smothering/heart rupture (3.5%). In IWK strain, of 24 causes attributed for death, incidence of weakling/emaciation/stunting, colibacillosis, cloacal prolapse, smothering/heart rupture and fatty liver/fatty liver hemorrhagic syndrome was 32, 9.6, 6.4, 5.6 and 3.2%, respectively. These incidences were highest among all layer strains indicating increased susceptibility of IWK for these diseases/disease conditions. Other significant causes of death were cannibalism (5.6%), respiratory tract infections (4.8%), visceral gout/dehydration (6.4%), heat prostration (10%), hepatitis (4%), necrotic dermatitis (6.4%), yolk peritonitis (4%) and lymphoid leukosis (1.6%). The findings will be useful in adapting the appropriate health strategies and management, thereby, reducing the mortality in layers and increasing their production.

Source : IPSACON-2005

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