Interactions between parasitic infections and reproductive efficiency in sheep.

摘要: This review article summarises the many reports in literature, confirming that, sheep, parasitic infections can adversely affect reproductive efficiency; examples, which refer to all parts of cycle are as follows: trichostrongylosis ewe-lambs (which lead delayed attainment puberty), myiosis prepuce cause impediment mating), chorioptic mange or trypanosomosis rams testicular degeneration azoospermia, respectively), sarcoptic pre-conceptual ewes poor conception rates reduced number ovulations, toxoplasmosis neosporosis pregnant causes abortion), trematode lactating reduction milk yield and be a risk factor for mastitis, cryptosporidiosis newborn lambs deaths), coccidiosis growing pre-weaned suboptimal growth rate). In other cases, status animal influence infection; examples increase faecal output during peri-parturient period (as consequence relaxation immunity), heavier trichostrongylid twin compared from single parities developmental origin issues lambs). All above support idea presence interactions between efficiency sheep.