Development and survival of Ascaris suum eggs in deep litter of pigs
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Development and survival of Ascaris suum eggs in deep litter of pigs. / Katakam, Kiran Kumar; Thamsborg, Stig Milan; Kyvsgaard, Niels Christian; Dalsgaard, Anders; Mejer, Helena.
I: Parasitology, Bind 141, Nr. 12, 2014, s. 1646-1656.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Development and survival of Ascaris suum eggs in deep litter of pigs
AU - Katakam, Kiran Kumar
AU - Thamsborg, Stig Milan
AU - Kyvsgaard, Niels Christian
AU - Dalsgaard, Anders
AU - Mejer, Helena
PY - 2014
Y1 - 2014
N2 - SUMMARY Indoor transmission of Ascaris suum partly depends on the physico-chemical conditions in bedding material. Temperature, pH, aqueous ammonia, moisture, occurrence and development of A. suum eggs were therefore compared in different areas (resting, intermediate and latrine) of two deep litter pens on an organic farm in four seasons. There was some variation, but mean ammonia levels were generally very low (1·0-2·6 mm) and pH levels were moderate (8·04-8·88) in all three areas. Relatively, resting areas were characterized by overall moderate moisture (36%) and moderately high temperature (35·7 °C) levels. The area contained few eggs (50 eggs g-1 DM) of which 17% were viable, and though only 4% were larvated and 0·7% appeared infective, it was more than in the other areas. Intermediate areas had moderate moisture (43%) and high temperature (43·6 °C) levels. There were many eggs (523 eggs g-1 DM), but overall viability was very low (5%) and few eggs were larvated (0·004%) or even infective (0·002%). Latrines typically had high moisture (79%) and moderate temperature (30 °C) levels. The concentration of eggs was very high (1444 egg g-1 DM) and though 32% were viable, none had developed larval stages. The large majority of A. suum eggs appear to die and only few become infective while in the deep litter. However, a large fraction of eggs may remain viable for some time and could thus contaminate agricultural land and develop to infectivity, if the manure is not composted appropriately.
AB - SUMMARY Indoor transmission of Ascaris suum partly depends on the physico-chemical conditions in bedding material. Temperature, pH, aqueous ammonia, moisture, occurrence and development of A. suum eggs were therefore compared in different areas (resting, intermediate and latrine) of two deep litter pens on an organic farm in four seasons. There was some variation, but mean ammonia levels were generally very low (1·0-2·6 mm) and pH levels were moderate (8·04-8·88) in all three areas. Relatively, resting areas were characterized by overall moderate moisture (36%) and moderately high temperature (35·7 °C) levels. The area contained few eggs (50 eggs g-1 DM) of which 17% were viable, and though only 4% were larvated and 0·7% appeared infective, it was more than in the other areas. Intermediate areas had moderate moisture (43%) and high temperature (43·6 °C) levels. There were many eggs (523 eggs g-1 DM), but overall viability was very low (5%) and few eggs were larvated (0·004%) or even infective (0·002%). Latrines typically had high moisture (79%) and moderate temperature (30 °C) levels. The concentration of eggs was very high (1444 egg g-1 DM) and though 32% were viable, none had developed larval stages. The large majority of A. suum eggs appear to die and only few become infective while in the deep litter. However, a large fraction of eggs may remain viable for some time and could thus contaminate agricultural land and develop to infectivity, if the manure is not composted appropriately.
KW - Faculty of Health and Medical Sciences
KW - deep litter
KW - bedding material
KW - Ascaris suum eggs
KW - development
KW - viability
KW - temperature
KW - ammonia
KW - pH
KW - moisture
U2 - 10.1017/S0031182014000912
DO - 10.1017/S0031182014000912
M3 - Journal article
C2 - 25017881
VL - 141
SP - 1646
EP - 1656
JO - Parasitology
JF - Parasitology
SN - 0031-1820
IS - 12
ER -
ID: 123675353