Resumo:Comparou-se a taxa de concepção de vacas leiteiras (22,4±5,58L) submetidas à IATF, usando dispositivo intravaginal com diferentes doses de progesterona (P4). As vacas foram implantados aleatoriamente com dispositivo de 1,0g (n= 43) ou 1,3g de P4 (n = 48) em seguida foi administrado 2 mg de benzoato de estradiol (BE, IM). No D3 foi coletado sangue para análise da concentração de P4. No D8 retirou-se o implante e administrou-se 0,15 mg de D-Cloprostenol (IM). No D9, foi injetado 1 mg de BE (IM) e aproximadamente 56 h após a retirada do implante realizou-se IATF. Foi coletada temperatura ambiente nos 50 dias que antecederam a inseminação. O diagnóstico de gestação foi realizado com ultrassom após 30 dias da IATF. A taxa de prenhez foi de 19,8%, sendo oito vacas com 1,0g e dez com 1,3g de P4. Não houve diferença na taxa de prenhez entre os grupos de P4 e a presença ou ausência de CL (teste 2). A temperatura ambiente máxima nos 50 dias antes da IATF foi maior (ANOVA) no subgrupo não prenhe com 1,3g de P4 em relação às não prenhes com 1,0g e às prenhes com 1,0 ou 1,3g de P4. Para cada aumento de 1ºC na média da temperatura ambiente dos 50 dias pré IA a taxa de prenhez diminui 42,1% (análise de regressão logística). Conclui-se que suplementar vaca em lactação (22L) com mais P4 intravaginal (1 ou 1,3 g) não modificou a taxa de concepção com o protocolo de IATF utilizado sob estas condições ambientais / Abstract:We compared the conception rate of dairy cows (22.4 ± 5,58L) submitted to TAI, using intravaginal device with different doses of progesterone (P4). The cows were randomly implanted with a device of 1.0g (n = 43) or 1.3 g P4 (n = 48) was then given 2 mg of estradiol benzoate (EB, MI). In D3 blood was collected for analysis of P4 concentration. In D8 was removed and the implant was administered 0.15 mg of D-cloprostenol (IM). At D9, was injected 1 mg of EB (MI) and about 56 h after implant removal was performed TAI. Ambient temperature was collected in the 50 days prior to insemination. Pregnancy diagnosis was performed with ultrasound after 30 days of TAI. The pregnancy rate was 19.8%, eight cows with 1.0g and ten with 1.3 g of P4. There was no difference in pregnancy rates between P4 groups and the presence or absence of CL (2 test). The maximum ambient temperature in the 50 days before IATF was higher (ANOVA) in patients not pregnant with 1.3 g of P4 in relation to non-pregnant with 1.0g and pregnant with 1.0 or 1.3 g of P4. For each increase of 1°C in average ambient temperature of 50 days pre AI pregnancy rate decreases 42.1% (logistic regression analysis). It was concluded that further lactating cow (22L) over intravaginal P4 (1 or 1.3 g) did not change the design rate with artificial insemination protocol used under these environmental conditions / Orientador:Guilherme de Paula Nogueira / Banca:Daniel de Jesus Cardoso de Oliveira / Banca:Claudia Maria Bertan Membrive / Mestre

Made available in DSpace on 2016-09-27T13:40:06Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-01-19. Added 1 bitstream(s) on 2016-09-27T13:45:18Z : No. of bitstreams: 1 000870638.pdf: 975473 bytes, checksum: 098ce51567505d382abc919825c10877 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / We compared the conception rate of dairy cows (22.4 ± 5,58L) submitted to TAI, using intravaginal device with different doses of progesterone (P4). The cows were randomly implanted with a device of 1.0g (n = 43) or 1.3 g P4 (n = 48) was then given 2 mg of estradiol benzoate (EB, MI). In D3 blood was collected for analysis of P4 concentration. In D8 was removed and the implant was administered 0.15 mg of D-cloprostenol (IM). At D9, was injected 1 mg of EB (MI) and about 56 h after implant removal was performed TAI. Ambient temperature was collected in the 50 days prior to insemination. Pregnancy diagnosis was performed with ultrasound after 30 days of TAI. The pregnancy rate was 19.8%, eight cows with 1.0g and ten with 1.3 g of P4. There was no difference in pregnancy rates between P4 groups and the presence or absence of CL (2 test). The maximum ambient temperature in the 50 days before IATF was higher (ANOVA) in patients not pregnant with 1.3 g of P4 in relation to non-pregnant with 1.0g and pregnant with 1.0 or 1.3 g of P4. For each increase of 1°C in average ambient temperature of 50 days pre AI pregnancy rate decreases 42.1% (logistic regression analysis). It was concluded that further lactating cow (22L) over intravaginal P4 (1 or 1.3 g) did not change the design rate with artificial insemination protocol used under these environmental conditions