Sainfoin, sula and wormwood effects on Haemonchus contortus infection in lambs | Efecto de la esparceta, zulla y artemisia en el desarrollo de la infección de corderos con Haemonchus contortus
2009
Valderrábano, J., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España) | Gómez Rincón, C., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España) | Calvete, C., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España) | Uriarte, J., Centro de Investigación y Tecnología Agroalimentaria de Aragón, Zaragoza (España)
The effect of sula, sainfoin, wormwood and lucerne dried forages consumption on pathophysiology and larval development in faeces of growing lambs infected with Haemonchus contortus was explored. Twenty-four lambs, 4 months old, were allocated to 1 of 4 treatment groups (n=6) that were offered either sula (Z; CT=3.03%), sainfoin (E; CT=2.65%), wormwood (A; CT=0.34%) and Lucerne (L; CT=0.3%) dried forages and infected with 7000 L3 H. contortus larvae in one dose. Voluntary intake was similar for all treatments but liveweight gains were affected (P< 0.05) by diet showing L lambs the lowest growth rate. Total worm and faecal egg counts for Z, E and A were 8, 13 and 49% and 22, 54 and 73% respectively lower than for L lambs 30 days after infection. No effect was found of CT content of diets on faecal egg count but worm fecundity appeared inversely related with lambs growth rate (r2= 0.858). Egg hatching in faecal cultures of Z (46%) and E (63%) were significantly lower (P<0.01) than of L (90.5%) lambs, while larval development test showed an increase in L3 recovered from faeces of lambs fed on Z (22%) and E (9.86%) respect of those from L (6.84%) and A (6.8%) diets. Results obtained suggest that dietary factors could notably affect larval development in faeces altering the tendencies of risk of infection derived from faecal egg excretion.
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