<i>Satureja hortensis</i> L. and <i>Calendula officinalis</i> L., Two Romanian Plants, with In Vivo Antiparasitic Potential against Digestive Parasites of Swine

Internal parasitic diseases of swine constitute a major welfare and health concern in low-input livestock farming. Due to an increase in chemical resistance, phytotherapeutic remedies have become an alternative for the prophylaxis and therapy of digestive parasitosis, albeit few remedies have been subjected to scientific validation. Low-input swine farming in Romania has adopted the traditional use of phytotherapy for controlling pathogens in livestock. The current study aimed to assess the antiparasitic potential of <i>Calendula officinalis</i> and <i>Satureja hortensis</i> against digestive parasites of swine in two low-input farms. The fecal samples were collected from sows, fatteners, and weaners, and were tested using the following coproparasitological methods: centrifugal sedimentation, flotation (Willis, McMaster egg counting technique), Ziehl–Neelsen stain modified by Henricksen, modified Blagg method, and in vitro nematode larvae/protozoan oocyst cultures. Six species of digestive parasites were diagnosed, namely <i>Ascaris suum</i>, <i>Trichuris suis</i>, <i>Oesophagostomum</i> spp., <i>Balantioides coli</i>, <i>Eimeria</i> spp., and <i>Cryptosporidium</i> spp., in various combinations, dependent on the swine category. A dose of 140 mg/kg bw/day of <i>C. officinalis</i> and 100 mg/kg bw/day of <i>S. hortensis</i> powders administered for 10 consecutive days revealed a strong antiprotozoal and anthelmintic activity on the aforementioned parasites. The curative efficacy can be attributed to the presence of polyphenols, sterols, tocopherols, and methoxylated flavones. In conclusion, our results indicate that <i>S. hortensis</i> and <i>C. officinalis</i> are promising alternatives to the commercially available antiparasitics, enabling their use as natural antiparasitic products against gastrointestinal parasites in pigs.