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BRAGA, F. A. Use of an intravaginal device for releasing progesterone-based TAI program in Nelore cows (Bos taurus indicus). [Emprego de um dispositivo intravaginal para liberação de progesterona em programa de IATF em vacas Nelore (Bos taurus indicus)]. 2008. 102 f. Dissertação (Mestrado em Medicina Veterinária) – Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, 2008. The artificial insemination (AI) is a biotechnique that causes the fastest genetic improvement of a herd and, therefore should be essential in the modern livestock. Heat detection inefficiency and low ovarian ciclicity in the postpartum period establish a great obstacle on applicability of AI programs. In front of these difficulties, the use of timed artificial insemination (TAI) improves the results, because eliminates the heat detection and induces the ciclicity of cows in anestrous postpartum. In TAI protocols is fundamental the use of intravaginal devices for releasing progesterone (P4). In the current market, these devices are imported and made of silicone, a biocompatible polymer, but not biodegradable. Recently intravaginal progesterone devices made of PHB, a biodegradable polymer, have been studied. The aim of this study was to compare the efficiency, in TAI program, of a new intravaginal device (Progestar), on pregnancy rate, in Nelore cows, with a device made of silicone DIB, currently available in the brazilian market. Were used 240 Nelore cows, in a generalized randomized block design, divided in two groups (control – DIB and treatment – Progestar, used in the synchronization protocols and TAI). Two experiments were done: the first experiment used new intravaginal devices (n=136), while the second experiment utilized used intravaginal devices (n=104). The pregnancy rates, of TAI (TAIPR) and breeding season (BSPR) (dependent variables), were compared by analysis of variance, separating the treatment, blocks and interactions effect. In experiment 1: there was no interaction between variables and treatment; there was no effect of treatment on TAIPR (DIB 66,7% and Progestar 65,8%) and on BSPR (DIB – 95% and Progestar – 94,7%); there was an interaction between postpartum period (PPP) and body condition score (BCS), in which animals in PPP1 (45 to 70 days) and BCS4 showed inferior results on TAIPR related to animals BCS5 and 6; there was also an interaction between PPP and ovary condition score (OCS), in which animals in PPP2 (71 to 90 days) not cyclic

Emprego de um novo dispositivo intravaginal para liberação de progesterona em programa de IATF em vacas Nelore (Bos taurus indicus)