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A Pilot Study of Tissue Factor-Tissue Factor Pathway Inhibitor Axis and Other Selected Coagulation Parameters in Broiler Chickens Administered in Ovo with Selected Prebiotics*.
The tissue factor (TF) - tissue factor pathway inhibitor (TFPI) axis plays a major role in hemostasis. Disorders of the coagulation system are commonly diagnosed with the help of screening tests such as prothrombin time (PT), activated partial thromboplastin time (aPTT), and plasma fibrinogen concentration (PFC). However, the effect of prebiotics on the hemostasis system has not been characterized in poultry yet. This study was designed to determine the effect of in ovo administration ofprebiotics on blood coagulation parameters of broiler chickens depending on their age. The study was conducted with 180 broiler chick embryos, the air cells of which were injected on day 12 of incubation with prebiotics (experimental groups: Bi2tos, DiNovoo and RFO) or physiological saline solution (control group). At 1, 21 and 42 days of rearing, blood was sampled from 15 broiler chickens from each group. An enzyme immunoassay was performed to determine plasma TF and TFPI levels, and PT, aPTT and PFC were determined in the chicken blood. We demonstrated that: 1) total TF levels increased with age in the experimental groups, 2) prebiotics had no significant effect on TF levels between the groups at a particular age, 3) total TFPI levels differed between both the type of in ovo injected substance and the broiler chicken age, 4) in the control group, PT and aPTT were found to increase with age whilst fibrinogen concentration decreased. The main conclusion from this pilot study is that total TF and TFPI levels change with age, however no clear patterns regarding TFPI were detected yet. The levels of PT, aPTT and PFC varied with the prebiotics administered in ovo as well as with the age of broiler chickens.
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