Graduate Thesis Or Dissertation
 

Effects of Dried Chicory Root on Parasite Loads and Complete Blood Count of Sheep

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/c247f150j

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  • Growing concerns over the rise of anthelmintic resistant populations of gastrointestinal nematodes (GINs) have led producers to look for alternative means of treatment. These sentiments have been echoed by organic producers, who are restricted from the use of synthetically derived anthelmintics in the US. Chicory has emerged as a potential source of alternative treatment methods for GINs in livestock. This is due to the presence of secondary compounds within chicory such as sesquiterpene lactones and condensed tannins that hold antimicrobial, anti-parasitic, and anti-inflammatory properties. This study focused on the inclusion of ground, dried chicory roots into the diets of finishing lambs in a confined feeding system. Chicory root was included in the diet in three concentrations: control (0% chicory root), low chicory (5% chicory root), and high chicory (10% chicory root). Seven-month-old, mixed sex, Polypay lambs (44.1 kg ± 4.3) were fed treatment diets for 30 days following an 11-day adaptation period, during which dry matter intake (DMI), liveweight gain (LWG), and fecal egg counts (FEC) were monitored. Previous to chicory introduction in the diet all lambs were inoculated with 10,000 epg of L3 stage Haemonchus contortus. Blood samples were also collected to determine if the inclusion of chicory root resulted in changes in the complete blood count (CBC). Dry matter intake and liveweight gains of animals were not affected (P = 0.28 and P = 0.48, respectively) by treatment groups. Similarly, inclusion of chicory roots in the diets of lambs did not have any effect on mean egg counts (epg) and mean oocyst counts (opg) (P = 0.77 and P = 0.21, respectively). No difference was observed (all P > 0.05) for any measured CBC parameters except for lymphocytes (103 cells/µ), mean corpuscular volume (MCV), mean platelet volume (MPV), and platelet distribution width (PDW). Lymphocyte (10³ cells/µ) were greater (P = <0.05) in lambs fed control diets than those fed with chicory. A dose × time interaction was detected for MCV, MPV, and PDW (fL) (P < 0.05, P < 0.01, and P < 0.05, respectively). The control diet increased values for all three parameters as the experiment progressed, while both chicory diets remained steady throughout the trial except for high chicory which had a fluctuating pattern for PDW values. In conclusion, while the inclusion of chicory root in the diet does elicit some changes in blood parameters, it did not have any efficacy for treating lambs with GIN infections at the 5% and 10% inclusion rates. However, chicory root can safely be included in the diets of lambs without a reduction in dry matter intake and liveweight gains, two important parameters for monitoring livestock production.
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file details KirschtenHaleyM2023.pdf 2023-03-21 Público Baixar