Abstract
The aim of this study was to evaluate the synchronization rate, ease to parturition, calves viability and retained placenta rate for Nellore recipients treated with triancinolone (TRI) + dexametasone (DEXA) + PGF2α (d-CLO). Hundred-ninety-four crossbred recipients (½ Nellore/ ½ Caracu) were divided into two groups (TRI, n = 97; Control, n = 97) and observed from 285 to 292 days of pregnancy. On Day 285, animals from Group TRI received 1mg/60 Kg of BW/IM of triancinolone (Retardoesteróide®, Hertape Calier Saúde Animal S/A) followed of association of 25mg of dexametasone (Caliercortin®, Hertape Calier Saúde Animal S/A) and 150μg of D-cloprostenol (Veteglan®, Hertape Calier Saúde Animal S/A) on Day 292. Animals from Control received injections of saline solution in same days. TRI had higher synchronization of parturition than Control (79.4% vs. 19.5, respectively; P < 0.05), as well TRI had lower assistance of parturition. No differences were observed for assistance of parturition comparing the born weight and gender of calves. TRI had lesser placenta retained than Control (11.4% vs. 25.8%, respectively; P < 0.05). In short, this strategy of induction resulted in better conditions of assistance and quality of parturition, decreasing the placenta retained in Nellore recipients implanted with embryos produced in vitro.
Highlights
Strategies aimed at increasing the productivity of cattle have been the focus of several studies in recent years, mainly related to timing of reproductive events and genetic gains in greater speed and range (Christenseng, 1991; Church and Shea, 1977; Hasler, 1995; Lohius, 1995; Ruane and Thompson, 1991; Bergmann and Penna, 1999)
The use of long-acting corticosteroids may result in a lower rate of retained placenta (Barth, 2006), as reported by Nasser et al (1994) that observed 13% of retained placenta with association of TRI + DEXA + d-CLO
BÓ et al (1992) reported that injection of opticortenol (OPT) seven days before induction with DEXA + d-CLO had lower placenta retained than group that receive only DEXA + CLO
Summary
Strategies aimed at increasing the productivity of cattle have been the focus of several studies in recent years, mainly related to timing of reproductive events and genetic gains in greater speed and range (Christenseng, 1991; Church and Shea, 1977; Hasler, 1995; Lohius, 1995; Ruane and Thompson, 1991; Bergmann and Penna, 1999). Barth et al (1981) and Lewing et al (1985) reported that the association of short-acting glucocorticoids and PGF2α resulted in high rates of retained placenta when compared to spontaneous birth. By another hand, the use of long-acting corticosteroids may result in a lower rate of retained placenta (Barth, 2006), as reported by Nasser et al (1994) that observed 13% of retained placenta with association of TRI + DEXA + d-CLO. In another study evaluating different doses (1mg/60kg of BW or 1mg/100Kg of BW) and time of injections (280 or 285 days) of TRI during pre-induction of parturition, Rezende et al (2009) observed similar results in all treatments. BÓ et al (1992) reported that injection of opticortenol (OPT) seven days before induction with DEXA + d-CLO had lower placenta retained than group that receive only DEXA + CLO
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