RESUMO.As éguas são animais reprodutivos estacionais, sendo influenciadas pelas mudanças na relação diária de luminosidade durante o ano, apresentando uma maior dificuldade no controle do ciclo estral, quando comparado aos bovinos. A utilização de indutores de ovulação pode melhorar a eficiência reprodutiva, sincronizando o momento das ovulações e reduzindo o período do estro. Os objetivos deste estudo foi avaliar o uso de indução do estro estimulado por implante de progesterona e o tempo de ovulação em fêmeas equinas utilizando o acetato de deslorelina como indutor de ovulação. Foram utilizadas cinco éguas em idade reprodutiva, que tiveram seu estro induzido por duas vezes cada uma. Em uma das vezes nas mesmas foi administrada com 750mg de acetato de deslorelina. Para indução do estro foi aplicado uma dose de 5mg via IM de prostaglandina F2 no D0 e inserido um dispositivo intra-vaginal que foi removido no D8, sendo concomitante a remoção aplicado uma dose de prostaglandina. Após a remoção dos dispositivos vaginais avaliou-se o crescimento folicular em intervalos de 12/12h até a ovulação. Todos os animais demonstraram comportamento de estro. Éguas tratadas com acetato de deslorelina tiveram o tempo de ovulação em média de 43,2h ±6,57 enquanto o grupo não tratado foi de 84h ±14,70, apresentando diferença significativa. Podendo-se concluir que o uso dispositivo intra-vaginal para bovinos induz a manifestação do estro em éguas; a administração de acetato de deslorelina antecipa o tempo de ovulação contribuindo para um melhor manejo reprodutivo em éguas. Palavras chave: cio, equina, ovário, reprodução Deslorelin acetate to induce ovulation in maresABSTRACT. The mares are seasonal reproductive animals, being influenced by the changes in the daily relation of luminosity during the year, presenting a greater difficulty in the control of the estrous cycle when compared to the cattle. The use of ovulation inducers can improve reproductive efficiency by synchronizing the time of ovulation and reducing the period of estrus. The objectives of this paper were to evaluate the use of progesterone-device for cow estrous induction and ovulation time in mares using deslorelin acetate as an ovulation inducer. Five mares of reproductive age were used, which had their estrus induced twice each. In one of them it was administered with 750 mg of deslorelin acetate. For estrous induction, a 5mg dose was administered via IM of prostaglandin F2alpha at the D0 and an intravaginal device was inserted, which was removed at D8, and a dose of prostaglandin was administered concomitantly. After removal of the vaginal devices follicular growth was evaluated at 12 / 12h intervals until ovulation. All animals showed estrus behavior. Mares treated with deslorelin acetate had a mean ovulation time of 43.2 ± 6.57 while the untreated group was 84.0 ± 14.70, with a significant difference. It

The objective was to evaluate the feeding behavior, physiological responses, and rumen heat emission of lambs fed with safflower grains. Eighteen lambs were randomly distributed in a completely randomized design. Safflower grain was added to the diets in the proportions of 0.0; 7.5 and 15%. The safflower grain did not change the patterns of eating, leisure, or rumination; however, it improved the efficiency of NDF ingestion, by 26%. The head temperature decreased by 1.5 ° C to include 7.5% safflower; and the rectal temperature decreased quadratically with the addition of safflower (39.5 and. 39.08 ° C). There was a linear trend of decreasing head temperature as the inclusion of safflower increased. The temperature of the eyeball decreased by 1.1 ° C when 7.5% of safflower DM was added to the diet and increased by 0.6 ° C when a 15% safflower was added. The ruminal temperature increased linearly for the addition of safflower (1.8 ° C). Safflower improves the efficiency of the use of NDF and the inclusion of 15% safflower can be used without effects on ingestive behavior. The head, eye, and left flank areas can be used; however, the left flank appears to be the best region for this type of study. Infrared thermography can be useful as a non-invasive assessment of lambs' diets.

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