A discrete Schrodinger spectral problem and associated evolution equations

A recently proposed discrete version of the Schrodinger spectral problem is considered. The whole hierarchy of differential-difference nonlinear evolution equations associated to this spectral problem is derived. It is shown that a discrete version of the KdV, sine-Gordon and Liouville equations are included and that the so called `inverse' class in the hierarchy is local. The whole class of related Darboux and Backlund transformations is also exhibited.Comment: 14 pages, LaTeX2

Indução de estro em cabras da raça Toggenburg com dois diferentes dispositivos intravaginais.

Doze cabras nuliparas da raça Toggenburg foram distribuidas em dois tratamentos (Tl e T2) para induçao do estro. 0 T1 (n=6) consistiu na inserçao da esponja imnpregnada com 60mg de acetato de medroxiprogesterona, associado a aplicaçao de 50mg do analogo sintetico d-cloprostenol (PGF). No quarto dia, foram aplicadas 250UI de gonadotropina corionica equina (eCG) e, no quinto, a esponja foi retirada. 0 T2 (n=6) diferiu somente quanto ao dispositivo empregado, que foi 0 CIDR-G@. Seis cabras do Tl e seis do T2 entraram em estro depois da retirada dos dispositivos, sendo que 83,3 (5/6) e 33,3% (2/6) ficaram gestantes em Tl e T2, respectivamente. 0 intervalo da retirada do dispositivo ao inicio do estro nao diferiu entre tratamentos (P>O,O5). As caracteristicas ovulatorias nao foram influenciadas pelos tratamentos. 0 intervalo da retirada do dispositivo a ovulaçao, para ambos os protocolos de induçao do estro, nao diferiu (P>O,O5) entre tratamentos. Ambos os dispositivos foram eficientes em induzir O estro. [Estrous induction in Toggenburg goats using intravaginal devices]. Abstract: Twelve Toggenburg breed nuliparous female goats were randomly assigned to two treatments intended to induce estrus. On day zero, animals on T1 (n=6) were treated with an intravaginal sponge impregnated with 60mg of medroxyprogesterone acetate plus 50µg of PGF analogue. The T1 goats received eCG (250IU) on day 4, and on day 5 the sponge was removed. The T2 goats (n=6) received CIDR-G® as intravaginal sponge plus 50mg of PGF analogue. All goats expressed behavioral estrus, and the pregnancy rates were 83.3 (5/6) and 33.3% (2/6) for T1 and T2, respectively. The interval from withdrawal of the device to onset of estrus did not differ between treatments (P>0.05). Ovulatory traits also were not affected by treatments. The interval between CIDR-G® removal and ovulation for T1 and T2 goats were similar (P>0.05). Both sponge and CIDR-G were equally efficient in inducing the estrus behavior in goats

Progesterona plasmática e fertilidade de fêmeas caprinas submetidas à sincronização do estro com prostaglandina F2?.

Resumo: Avaliou-se a resposta ao protocolo de sincronização do estro com duas doses de prostaglandina F2 (22,5µg) intervaladas de 10 dias, por meio da mensuração da concentração de progesterona plasmática, bem como a taxa de concepção das cabras após a inseminação artificial, de acordo com as diferentes respostas obtidas. Utilizaram-se 23 fêmeas e dois reprodutores da raça Toggenburg. A mensuração da progesterona plasmática foi realizada no dia da primeira aplicação de PGF2? (D0), no D5, no dia da segunda aplicação de PGF2? (D10), no D15, no D20 e no D33. A resposta positiva à PGF2? foi determinada pela queda da concentração de progesterona a valores abaixo de 1,5ng/mL, mensurada nos dias cinco e 15. As fêmeas foram distribuídas em três grupos. O grupo I foi composto por fêmeas que responderam às duas aplicações; o grupo II por fêmeas que não responderam à primeira aplicação e responderam à segunda aplicação; e o grupo III por fêmeas que responderam à primeira aplicação e não responderam à segunda aplicação, foram inseminadas e não conceberam. A presença de um corpo lúteo funcional, no momento das aplicações, determinou a resposta ao protocolo. As diferentes respostas das fêmeas ao protocolo, grupo I e II, não influenciaram as taxas de concepção. Plasmatic progesterone and fertility of goats submitted at estrus synchronization with Prostaglandin F2?. Abstract: Plasmatic progesterone concentrations were evaluated during the synchronization protocol with two doses of 22.5µg of Prostaglandin F2?, 10-day interval, and the conception rate of females in accordance to the reply to the protocol. Twenty-three female goats and two sexually mature Toggenburg bucks were used. Blood was sampled on day 0 (1st PGF2? injection), and on the following days 5, 10 (2nd PGF2? injection), 15, 20, and 33. The positive reply to the PGF2? was determined when the progesterone concentrations fell to values below 1.5ng/mL at days 5 and 15. The females were divided in three groups: Group I: females that responded to the two PGF2? applications; Group II: females that responded only to the second application; Group III: females that responded the first application, did not respond to the second application, were inseminated but did not conceive. The presence of a functional corpus luteum at the moment of the applications determined the reply to the protocol. There was no difference in the conception rates between females that responded to the two PGF2? applications or responded only to the second application

Induction of synchronized estrus in dairy goats with different gonadotrophins.

The objective of this study was to evaluate lhe efficiency of two gonadotrophins in induction of estrus in dairy goats. A total of 47 dairy goats were randomly divided according to breed into two treatments (T1 and T2). In both treatments, goats received intravaginal sponges containing 60 mg medroxy-progesterone acetate for six days and sub- vulvar administration of 22.5 mg of d-cloprostenol at the time of sponge insertion. In TI (n=23) and T2 (n=24), animaIs received intramuscuIar administration of 200 lU and 250 lU of eCG and hCG, respectively. After sponge removal, goats were monitored twice daily (06:00 a.m. and 18:00 p.m.) with bucks. Animals were bred at lhe start of estrus and at each 12 hours interval until lhe end of estrus. Pregnancy was checked by ultrasonography 63 days after breeding. Percentage of animals in estrus did not differ (P>0.05) between TI (95.6%) and T2 (78.3%). There was no effect (P>0.05) of treatment on interval from sponge removal to lhe Start of estrus (IE) and duration of estrus (DE). The" average IE was 48.0 + 9.4h and 46.2+ 8.4h for eCG and hCG, respectively. The average DE was 20.7 + 11.9h and 18.8 + 9.0h for eCG and hCG, respectively. Pregnancy cate did not differ (P>0.05) between eCG (77.3%) and hCG (61.1%). Results of this study showed that estrus can be efficiently induced in female goats outside lhe breeding season with both eCG and hCG

Estro e ovulação em cabras Saanen em anestro estacional submetidas a protocolos curtos de indução de estro.

Edição dos anais da 21o. Reunião Anual da Sociedade Brasileira de Tecnologia de Embriões - SBTE, Salvador, 2007

Superovulação de cabras utilizando a primeira onda folicular do ciclo estral.

Edição dos resumos da 20. Reunião Anual da Sociedade Brasileira de Tecnologia de Embriões, Araxá, MG, agosto 2006