24 research outputs found

    Comparaci贸n de dos protocolos para sincronizar ovulaci贸n e implementar inseminaci贸n artificial en vaquillonas

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    Se efectuaron dos experimentos (EI y EII) en vaquillonas Bos taurus de 20-24 meses de edad y 3-3,5 de condici贸n corporal (escala 1 a 5). El objetivo fue comparar dos protocolos de sincronizaci贸n de la ovulaci贸n (PSO), utilizando dispositivos intravaginales con progesterona (DISP) combinados con cipionato de estradiol (CPE) administrado al momento de retirar el DISP o benzoato de estradiol (BE) 24 h m谩s tarde. En el d铆a 0, las vaquillonas (EI, n=16; EII, n=173) recibieron un DISP (1 g de progesterona) m谩s 2 mg BE; en el d铆a 8 se retir贸 el DISP, se administraron 0,150 mg de D-Cloprostenol y se aplic贸, a sendos PSO, una inyecci贸n de 1 mg de CPE en dicho momento o 1 mg de BE 24 h m谩s tarde. En EI, se efectuaron ecograf铆as (d铆as 0, 8 y 9 y desde este 煤ltimo momento cada 12 h hasta el d铆a 11) y muestreos sangu铆neos para determinar progesterona plasm谩tica (P4; d铆as 8, 9, 10, 11 y 21); se determin贸 porcentaje de vaquillonas con cuerpo l煤teo (d铆as 0 y 8), los di谩metros de los fol铆culos dominante (FD, d铆a 8) y ovulatorio. En EII, se realiz贸 IATF (d铆a 10) y se determin贸 pre帽ez (d铆a 35). Los an谩lisis estad铆sticos se realizaron por SAS. Los di谩metros del FD (13,1卤2,4 mm) y ovulatorio (15,4卤2,2 mm) y el intervalo retiro DISP-ovulaci贸n (65,3卤5,3 h) no difirieron entre PSO (p>0,05); se observ贸 un efecto del d铆a sobre el nivel de P4 (p0,05), el nivel de P4 al d铆a 8 (4,6卤4,4 ng/ml) disminuy贸 a valores 0,05). Se concluye que en vaquillonas Bos taurus, ambos PSO generan similares cambios ov谩ricos, variaciones en el nivel de P4 y porcentajes de pre帽ez

    Efecto de la sal de estradiol, estatus ov谩rico y condici贸n corporal sobre el porcentaje de pre帽ez en vacas con cr铆a IATF

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    Armendano, J.I.; Gonz谩lez Chaves, S.; Uslenghi, G.; Cabodevila, J.; Callejas, S.S.: Efecto de la sal de estradiol, estatus ov谩rico y condici贸n corporal sobre el porcentaje de pre帽ez en vacas con cr铆a IATF. Rev. vet. 26: 2, 108-112, 2015

    Electropermeabilization of endocytotic vesicles in B16 F1 mouse melanoma cells

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    It has been reported previously that electric pulses of sufficiently high voltage and short duration can permeabilize the membranes of various organelles inside living cells. In this article, we describe electropermeabilization of endocytotic vesicles in B16 F1 mouse melanoma cells. The cells were exposed to short, high-voltage electric pulses (from 1 to 20 pulses, 60聽ns, 50聽kV/cm, repetition frequency 1聽kHz). We observed that 10 and 20 such pulses induced permeabilization of membranes of endocytotic vesicles, detected by release of lucifer yellow from the vesicles into the cytosol. Simultaneously, we detected uptake of propidium iodide through plasma membrane in the same cells. With higher number of pulses permeabilization of the membranes of endocytotic vesicles by pulses of given parameters is accompanied by permeabilization of plasma membrane. However, with lower number of pulses only permeabilization of the plasma membrane was detected

    Efecto del cipionato de estradiol y la GnRH sobre la sincronizaci贸n de ovulaciones y la tasa de pre帽ez a la IATF en vacas de cr铆a sin ternero al pie

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    Two experiments were conducted to evaluate the effect of estradiol cypionate (ECP), Gonadotropin realizing hormone (GnRH) and the combination of both on synchronization of ovulations and pregnancy rate at fixed-timed artificial insemination (FTAI). In Experiment 1, forty cows were randomly assigned to received different ovulation inducers (n=10/group): 1 mg of ECP; 1 mg of estradiol benzoate (EB); 10.5 碌g of buserelin acetate (GnRH); 1 mg of ECP plus 10.5 碌g of GnRH. Ovarian ultrasonography examinations were performed every 12 h from intravaginal device removal to ovulation, to detect the dominant follicle and ovulation. In Experiment 2, cows received the same treatments: Group ECP: n=71; Group EB: n=70; Group GnRH: n=67; Group ECP-GnRH: n=70, and FTAI 48-50 h after intravaginal device removal. Pregnancy rate was determined on day 35 by ultrasonography. Variables were analyzed by SAS. There was no effect of treatments on follicular dynamics, and on the mean interval to ovulation (P>0.05); however, GnRH treated cows had scattered distribution of ovulations (P0.05) between treatments (P>0.05; ECP: 46.3%, EB: 54.3%, GnRH: 47.9% y ECP+GnRH: 60.0%). In conclusion, GnRH administration in cows that receive ECP at PID removal tended to improve the distribution of ovulations, but did not enhance pregnancy rate at FTAI.Fil: Uslenghi, G. CONICET. Centro de Investigaci贸n Veterinaria de Tandil (CIVETAN). Tandil, ArgentinaFil: Cabodevila, J. CONICET. Centro de Investigaci贸n Veterinaria de Tandil (CIVETAN). Tandil, ArgentinaFil: Callejas, S.S. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Veterinarias. 脕rea de Reproducci贸n, FISFARVET. Tandil, ArgentinaFil: Callejas, S.S. CONICET. Centro de Investigaci贸n Veterinaria de Tandil (CIVETAN). Tandil, ArgentinaSe evalu贸 el efecto del cipionato de estradiol (CPE), de la Hormona Liberadora de Gonadotrofina (GnRH) y la combinaci贸n de ambos sobre la sincronizaci贸n de ovulaciones y la tasa de pre帽ez post inseminaci贸n artificial a tiempo fijo (IATF) en vacas de cr铆a sin ternero al pie. En el Experimento 1, se utilizaron 40 vacas secas, las cuales se dividieron aleatoriamente para recibir cuatro inductores de la ovulaci贸n (n=10/grupo): 1 mg de CPE; 1 mg de benzoato de estradiol (BE), 10,5 碌g de GnRH, o la combinaci贸n de CPE+GnRH. Se realizaron ecograf铆as cada 12 horas para determinar el momento de ovulaci贸n. En el Experimento 2, las vacas recibieron los mismos tratamientos: Grupo CPE: n=71; Grupo BE: n=70; Grupo GnRH: n=67; Grupo CPE+GnRH: n=70. El D铆a 10 las vacas fueron IATF, el diagn贸stico de gestaci贸n se realiz贸 por ultrasonograf铆a a los 35 d铆as posteriores. Los datos se analizaron mediante el programa SAS. No hubo efecto del tratamiento sobre la din谩mica folicular ni sobre la hora promedio de ovulaci贸n (P>0,05); sin embargo, las vacas tratadas con GnRH tuvieron mayor dispersi贸n de ovulaciones (P0,05; CPE: 46,3%, BE: 54,3%, GnRH: 47,9% y CPE+GnRH: 60,0%). En conclusi贸n, la administraci贸n de GnRH en vacas que recibieron CPE tiende a mejorar la distribuci贸n de ovulaciones, pero no incrementa la tasa de pre帽ez a la IATF

    Effects of permanence time of intravaginal device with progesterone upon reproductive efficiency of Holstein Heifers

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    The objective of the present work was to evaluate the effect of the presence of progesterone (0.558 g) intravaginal devices for 7 or 8 days on reproductive efficiency. A total of 53 Holstein heifers (20-27 month-old; 3.9卤0.2 body condition score) were used. Heifers were assigned to 2 treatment: 1) M24 7d: Day 0, insertion of intravaginal device (0,558 g progesterone) + 2 4 7d: mg of estradiol benzoate (EB); day 7, device removal and administration of 150 mg of DCloprostenol; day 8, 1 mg EB; day 9, (Fixed Timed Artificial Insemination (FTAI); 2) M24 8d: Similar to M24 7d, but the permanence of the device was of 8 days. Seventeen to 25 days after FTAI, heifers returning to estrus were inseminated. Pregnancy diagnosis was done by ultrasonography 28 days after FTAI (FTAI pregnancy) and by transrectal palpation at 60 day after return to estrus (estrus return pregnancy). There was no effect of treatments on pregnancy rate at FTAI (63.0 vs. 73.1%), pregnancy rate to detected heat (57.1 vs. 50.0%), general pregnancy rate (77.8 vs. 84.6%), and heat detection rate (70.0 vs. 85.7%) (P>0.05). In conclusion, the device with 0.558 g of progesterone can remain in the vagina for 7 or 8 days without affecting reproductive efficiency of Holstein heifers.Fil: Callejas, S. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Veterinarias. 脕rea de Reproducci贸n, FISFARVET. Tandil, ArgentinaFil: Gonz谩lez Chaves, S. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Veterinarias. 脕rea de Reproducci贸n, FISFARVET. Tandil, ArgentinaFil: Gonz谩lez Chaves, S. Comisi贸n Investigaciones Cient铆ficas de la Provincia de Buenos Aires (CIC). Buenos Aires, ArgentinaFil: Cabodevila, J. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Veterinarias. 脕rea de Reproducci贸n, FISFARVET. Tandil, ArgentinaFil: Cledou, G. Biog茅nesis - Bag贸. Buenos Aires, ArgentinaSe utilizaron 53 vaquillonas Holando Argentino (edad: 20?27 meses; condici贸n corporal: 3,9卤0,2) para evaluar si dispositivos intravaginales (DIV) con 0,558 g de progesterona (Cronipres M-24, Biog茅nesis Bag贸) pueden permanecer en vagina durante 7 u 8 d铆as sin afectar la eficiencia reproductiva. Se distribuyeron a dos tratamientos: 1) M24 7d: El d0 se coloc贸 un DIV (0,558 g de progesterona) y se administr贸 2 mg de Benzoato de Estradiol (BE, Bioestrogen, Biog茅nesis Bag贸), el d7 se retir贸 el DIV y se administr贸 150 mg de DCloprostenol (PGF, Enzaprost, Biog茅nesis Bag贸), el d8 se inyect贸 1 mg de BE y el d9 se realiz贸 Inseminaci贸n Artificial a Tiempo Fijo (IATF). 2) M24 8d: Similar M24 7d, pero el DIV permaneci贸 por 8 d铆as. Diecisiete a 25 d铆as post IATF se reinsemin贸 toda vaquillona en celo. El diagn贸stico de gestaci贸n se realiz贸 por ultrasonograf铆a (pre帽ez IATF) y palpaci贸n transrectal (pre帽ez del retorno). No se observ贸 efecto del tratamiento sobre los porcentajes de pre帽ez a la IATF (63,0 vs. 73,1%), retorno (57,1 vs. 50,0%) y final (77,8 vs. 84,6%), ni sobre el porcentaje de retorno (70,0 vs. 85,7%; M24 7d vs. M24 8d; P>0,05). En conclusi贸n, el DIV con 0,558 g de progesterona puede permanecer colocado por 7 u 8 d铆as, en vaquillonas Holando Argentino, sin afectar la eficiencia reproductiva

    Pain and efficiency in neonatal blood sample screenings, New devices for reducing pain and improving blood sample quality

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    International audienceNeonatal blood sample screening is recognised as a difficult gesture and painful to the newborns. The number of detected diseases is still relatively low and depends on the country where it is performed. There is a real need for new techniques that reduce pain, facilitate the blood sampling, increase the quantity of sampled blood and improve the collection of blood of the cardboard blotter actually used. In this paper, we present systems that are currently developed in Besan莽on (France) in collaboration between the FEMTO-ST Institute and the University Hospital. They mainly concern micro-needles arrays and pressure free blood sampling devices. The choice of these systems has been dictated by a study of the pain that newborns feel during the gesture. The ulterior motive of this work is to improve neonatal blood sample screenings and therefore, to increase the number of screened diseases and try to generalise this technique to places where it is not yet done
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