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Vetrabutine clorhydrate use in dystocic farrowings minimizes hemodynamic sequels in piglets

González-Lozano, M., Trujillo-Ortega, M.E., Alonso-Spilsbury, M., Rosales, A.M., Ramírez-Necoechea, R., González-Maciel, A., Martínez-Rodríguez, R., Becerril-Herrera, M., Mota-Rojas, D.
Theriogenology 2012 v.78 no.2 pp. 455-461
blood, blood pH, body weight, calcium, drugs, farrowing, piglets, sows, umbilical cord
The objective was to measure the effects of VC (a uterotonic drug with vasodilator effects) in eutocic and dystocic sows, on the acid–base balance and some vitality traits of piglets at birth. Farrowing was induced with prostaglandin F2α. Four groups of sows (20 sows/group) were monitored; Groups 1 and 2 were eutocic sows, whereas Groups 3 and 4 were dam-fetal dystocic sows. Groups 1 and 3 (control) were given saline, whereas Groups 2 and 4 were given VC im (1.66 mg/kg of body weight) after the first piglet was born. Piglets' physio-metabolic performance was monitored peripartum. Treatment with VC reduced (P < 0.0001) the percentage of intrapartum stillbirths in sows either with eutocic (5.2 vs. 10.0%) and dystocic (7.6 vs. 16.7%) farrowings and increased (P < 0.0001) the number of pigs born alive without any evidence of AFS (89.9 vs. 79.9%, eutocic and 81.6 vs. 65.2%, dystocic). In addition, for the group of pigs with no acute fetal suffering (AFS), VC treatment enhanced survival responses with a half point grater vitality score in Group 4; it also reduced the latency to first teat contact by 6 min (P < 0.05) in both treated groups compared to controls; and it improved the condition of the pigs' umbilical cord, with more adhered (98 vs. 86% in eutocic and 88 vs. 80% in dystocic; P < 0.05) and less ruptured cords. Moreover, VC reduced the severity of adverse physio-metabolic indicators and the acid–base balance of piglets with AFS at birth by lowering blood lactate (89.8 vs. 93.5 mmol/L in eutocic groups and 94.6 vs. 100.2 mmol/L in dystocic groups; P < 0.05), Pₐco₂ and Ca²⁺, and by increasing blood pH, HCO₃ and Pₐo₂ levels (P < 0.05).