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Search Results: 1 - 10 of 77322 matches for " Ciro Alexandre Alves;Silva "
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Peso para recupera??o da atividade ovariana luteal cíclica em vacas leiteiras mesti?as em anestro
Ferreira, Ademir de Moraes;Torres, Ciro Alexandre Alves;Silva, José Fernando Coelho da;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000300021
Abstract: a study was carried out to determine the weight gain and the minimal weight needed to reestablish the ovarian luteal cyclic activity (olca) in dry crossbred holstein-zebu cows, thin and with the ovaries inactive, an overall condition of anestrus caused by prolonged period of feed restriction. eighteen animals were allocated into two groups: 1) six animals, with average body weight of 322.0 ± 27.0 kg, receiving maintenance diet specific for the low body weight (group i); 2) twelve animals with average body weight of 315.0 ± 29.4 kg, being fed for weight gain until olca reestablishment (group ii). blood for progesterone ria and body weight were taken weekly. the olca was evaluated by the progesterone level, rectal examination of the ovaries at 12-day intervals and by visual observation three times a day. an averaged body weight of 392.7 ± 29.4 kg was needed for the reestablishment of the olca. the total mean weight gain was 77.7 ± 11.2 kg, corresponding to 24.7 ± 4.5% of the anestrus animal's weight, or 37.7% of 206.2 kg lost in the restricted phase in order to undergo anestrus. six animals of control group (1) were in anestrus. the results showed the influence of feed level on the luteal ovarian function and the need of weight gain in order to reestablish the estrus cycle in dry cross bred dairy cows, thin and in anestrus.
Estrus behavior in Guzera (Bos taurus indicus) breed cows
Alves, Nadja Gomes;Pires, Maria de Fátima ávila;Silva Filho, José Monteiro da;Saturnino, Helton Mattana;Sá, Wanderlei Ferreira de;Torres, Ciro Alexandre Alves;
Ciência e Agrotecnologia , 2009, DOI: 10.1590/S1413-70542009000500032
Abstract: the estrus behavior was evaluated during an induced and natural subsequent estrus in twelve guzera breed cows, in the winter and summer seasons in two consecutive years. the proportion of cows that responded to estrus synchronization was 84.8%. the effect of the interaction season x year of experiment on estrous cycle length was observed. pro-estrus was longer in the summer (57.69±4.72h) and in the natural estrus (74.23±4.41h) than in the winter (38.95±4.02h) and in the induced estrus (22.40±4.36h). estrus length was similar in the winter (11.48±0.70h) and in the summer seasons (13.40±0.82h) as well as among cows with induced (12.47±0.75h) and natural estrus (12.41±0.76h). the number of mounts accepted during estrus and the number of mounts accepted/ hour in estrus were similar in winter (29.17±2.86 and 2.59±0.22, respectively) and summer (31.45±3.36 and 2.42±0.26, respectively) as well as between induced (30.23±3.10 and 2.54±0.24, respectively) and natural estrus (30.40±3.14 and 2.47±0.24, respectively). the length and intensity of estrus were not influenced by synchronization or season of the year. longer period of pro-estrus in summer may favor the identification of sexually active animals in this season.
Effect of urea in the diet on ovarian follicular dynamics and plasma progesterone concentration in Alpine goats
Alves, Nadja Gomes;Torres, Ciro Alexandre Alves;Guimar?es, José Domingos;Moraes, Elenice Andrade;Rodrigues, Marcelo Teixeira;Cecon, Paulo Roberto;Bitencourt, Luciene Lignani;Amorim, Lincoln da Silva;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000700016
Abstract: to evaluate the effect of using urea in the diet on ovarian follicular dynamics and plasma urea and progesterone concentration, an experiment was carried out with 29 alpine goats randomly distributed into four diets, each one containing 0%; 0.73%; 1.46% or 2.24% of urea on total dry matter. the follicular dynamics was monitored daily by ultrasonography. the estrous cycles were characterized by occurrence of two, three, four or five follicular waves. the emergence day of the first follicular wave in cycles with two waves, the length of the third wave and the maximum diameter of the largest follicle of the third wave in cycles with three waves presented a quadratic behavior according to the percentage of urea in the diets. in cycles with four waves, the urea intake did not influence the follicular dynamics. the interestrus and interovulatory periods and the luteal and follicular phases length did not differ among treatments. the plasma urea concentration did not differ among diets neither among collection weeks. plasma progesterone concentration on the estrus day and on the 11th day after estrus presented quadratic behavior, and on the 15th day after estrus, it linearly reduced acording to the percentage of urea in the diets. the supply of urea in diets at levels up to 2.24% in dietary dry matter did not influence the dry matter intake and the urea plasma concentration. for goats, the emergence day and the length of the waves, the follicular diameter and the plasma progesterone concentration on the estrus day and in the latter stages of diestrus were altered when there was supply of urea in the diet.
Uso de dimetil-formamida associada ou n?o ao glicerol na criopreserva??o de sêmen caprino
Silva, Alessandra Ferreira da;Costa, Eduardo Paulino da;Oliveira, Fabrício Albani;Torres, Ciro Alexandre Alves;Hass, Giorgia Thaís da Silva;Nascimento, Vinício Araújo;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000200016
Abstract: the objective of this trial was to evaluate the efficiency of dimethylformamide on cryopreservation of goat semen using semen physical analyses and complementary tests. alpine and saanen bucks from the dairy goat experimental station- dzo were used. semen samples were frozen with a yolk-skimmed milk diluent and cryoprotectors with different concentrations as follows: 7% glycerol (t1), 3.5% glycerol plus 3.5% dimethylformamide (t2) or 5% dimethylformamide (t3). semen was centrifuged, diluted, and bottled in 0.5 ml straws followed by cooling for 40 minutes until reach 5.0°c and kept at this temperature for additional 80 minutes. samples were then exposed to liquid nitrogen vapor for 15 minutes and finally frozen. thawing was done in a waterbath at 37°c for 50 seconds. the following variables were evaluated in vitro: sperm progressive motility and vigor, acrosomal integrity and reaction, and plasmatic membrane integrity. the cryopreservation procedures reduced 30.0% of the initial motility and 19% of plasmatic membrane integrity that was evaluated using the hyposmotic swelling test (host). it was observed an increaseof 3% in acrosomal lesions when samples were submitted to a slow thermoresistance test (trt). no significant differences in sperm motility were observed among treatments at 0, 5, and 60 minutes of trt as well as in sperm vigor at all trt times. however, at 120 minutes of trt a significant difference in sperm motility was found comparing t1 and t2 while t3 was intermediate. there were no significant differences on plasmatic membrane integrity, acrosomal integrity, and post-thawing acrossomal reaction across treatments. it can be concluded that dimethylformamide can be a viable alternative for goat semen cryopreservation used alone or in association with glycerol.
Rela??o da taxa de gesta??o com sêmen bovino congelado e testes de avalia??o espermática in vitro
Siqueira, Jeanne Broch;Guimar?es, José Domingos;Costa, Eduardo Paulino da;Henry, Marc;Torres, Ciro Alexandre Alves;Silva, Marcos Vinícius Gualberto Barbosa da;Silveira, Thiago da Silva;
Revista Brasileira de Zootecnia , 2007, DOI: 10.1590/S1516-35982007000200016
Abstract: the objective of this study was to evaluate the relationship between complementary (hiposmotic, thermo-resistance and acrosome reaction tests) and conventional evaluations (physical and morphologic aspects) of bovine frozen/thawed semen and conception rates. average values for spermatic motility evaluated by thermo-resistance test were of 53.48% (post-thawed), 43.69% (60 minutes), 35.88% (120 minutes) and 33.04% (180 minutes). the percentage of reactive cells observed for the hiposmotic test was 37.89%. average intensity was observed for post-thawing spermatic motility, positively correlated to hiposmotic test (0.21). however, correlation between motility in the 180 minutes and hiposmotic test was high (0.64). the percentage of cells presenting post-thawing acrosome reaction was 9.85%, which was negative correlated to post-thawing (-0.25) and after three hours of incubation (-0.46) spermatic motility. no correlation was observed for complementary tests and post-thawed motility and the conception rate. no one of the parameters evaluated in this study was individually able to indicate the fertilizing capacity of the frozen/thawed semen.
Vitrifica??o de ovócitos desnudados ou n?o e previamente maturados in vitro
Fagundes, Letícia Martins;Costa, Eduardo Paulino da;Torres, Ciro Alexandre Alves;Amaral Filha, Wald'ma Sobrinho;Silva, Trícia Osório da;Gioso, Marilú Martins;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000500004
Abstract: this study aimed at the evaluation of the effects from cryopreservation of bovine oocytes in vitro matured, by using ethylene glycol (eg) associated to trehalose and polyvinylpyrrolidone (pvp), of ovary oocytes of slaughtered cows, randomly assigned to three treatments. treatment 0 (t0 - control): oocytes that were desnuded and not vitrified. treatment 1 (t1): cryopreservation of in vitro matured oocytes with cumulus oophorus. tratamento 2 (t2): cryopreservation of in vitro matured desnuded oocytes. the percentage of recovered oocytes after cryopreservation and with normal morphology was different for vitrified oocytes (94.7 and 76.8%; 69.5 and 48.85% for t1 and t2, respectively). the main changes ultrastructural in vitrificated oocytes were prematurely released of cortical granules. later, all normal oocytes were fecundated and cultivated at 38.5oc in atmosphere with 5% co2 for seven days. the fecundation and cleavage rates for treatments were different (56.2, 41.7 and 12.5%; 36.3, 0.0 and 0.0%, for t0, t1 and t2, respectively). morulas and blastocysts were obtained only in t0 (34.5%). these results indicate that, the used protocols, for vitrification procedure is not indicated for cryopreservation of matured bovine oocytes.
Embryo development and follicular status of Toggenburg does fed urea diet
Amorim, Lincoln da Silva;Torres, Ciro Alexandre Alves;Siqueira, Luiz Gustavo Bruno;Fonseca, Jeferson Ferreira da;Guimar?es, José Domingos;Carvalho, Giovanni Ribeiro de;Alves, Nadja Gomes;Oliveira, Margarida Maria Nascimento Figueiredo de;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000200007
Abstract: the effects of feeding urea on embryo production, quality and developmental stages and follicular status at the beginning of a superovulatory treatment of toggenburg does fed urea diet were investigated in this study. eighteen females were randomly allocated to receive diets with: no urea (control, n=8), and 2.4% urea dietary dry matter (n=10) udm. the embryo recovery was performed at day 7 or 8 of estrus cycle by transcervical technique and classified according to quality and developmental stage. the follicular status was determined by transrectal ultrasonography at the first day of fsh injection. the number and quality of embryos were not affected by dietary urea concentration. embryos from does treated with 2.4% udm were recovered at advanced stage. urea concentration (2.4%) decreases the number of follicles with less than 5 mm diameter. this follicle class is positively correlated to the number of recovered embryos and to the number and percentage of excellent and good embryos.
Exigências de energia e composi??o da carca?a de galos reprodutores pesados em fun??o do consumo energético na fase de reprodu??o
Borges, Carlos Augusto Quadro;Rostagno, Horacio Santiago;Silva, José Humberto Vilar da;Albino, Luiz Fernando Teixeira;Torres, Ciro Alexandre Alves;Jord?o Filho, José;Ribeiro, Marcelo Luís Gomes;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000700014
Abstract: two trials were carried out to estimate the nutritional requirement and carcass composition of male broiler breeders according to five levels of metabolizable energy (me) ingestion. four hundred and fifty females and 75 males of cobb-500 strain were selected to evaluate body weight, semen volume, spermatic concentration, motility, vigor and fertility of spermatozoa. thirty males were used for evaluation of carcass chemical composition (dm, cp and crude fat [cf]) as a function of energy intake. the experiment was analyzed as a completely randomized design with five treatments (290, 310, 330, 350 and 370 kcal of me/rooster/day). in the first trial (reproductive performance), each treatment was represented by 15 replicates of one rooster and six females. in the second trial (carcass evaluation), each treatment consisted of two replicates of three roosters (three slaughtered at 45 weeks and three at 61 weeks of age). treatment quadract effect on motility, vigor and the fertility of spermatozoa was observed. body weight and contents of fat and cp in the carcass increased linearly as me intake increased. based on the estimates of mobility, vigor and fertility, the 347 kcal of me/rooter/day level is recommended to meet the requirements of male broiler breeders from 26 to 61 weeks of age.
Exigência de proteína e composi??o da carca?a de galos reprodutores de 27 a 61 semanas de idade
Borges, Carlos Augusto Quadro;Rostagno, Horacio Santiago;Silva, José Humberto Vilar da;Albino, Luiz Fernando Teixeira;Torres, Ciro Alexandre Alves;Jord?o Filho, José;Ribeiro, Marcelo Luís Gomes;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000700013
Abstract: two trials were carried to estimate the protein requirements and carcass composition of male broiler breeders from 27 to 61 weeks of age. four hundred and fifty females and 75 males of cobb-500 strain were selected to evaluate the body weight, semen volume, spermatic concentration, mobility, vigor and fertility of spermatozoa. thirty males were used for evaluation of carcass chemical composition (dm, cp and crude fat [cf]) as a function of protein intake. the experiment was analyzed as a complete randomized design with five treatments (12.0, 14.2, 16.4, 18.6, and 20.8 g cp/bird/day). in the first trial (reproductive performance evaluation), each treatment was composed by 15 replicates of one rooster and in the second trial (carcass evaluation), each treatment consisted of two replicates of three roosters (three were slaughtered at 45 weeks and three at 61 weeks of age). quadract effect of cp intake on semen volume, spermatic concentration, motility, spermatozoa vigor and fertility was observed. only body weight and dm percentage were not affected by treatments. however, at extreme levels (deficiency or excess) of protein intake, cf percentage in the carcass increased and the reproductive performance decreased. therefore, the intake of 16.9 g of cp/rooster/day is recommended to meet cp requirements of male broiler breeders from 27 to 61 weeks of age.
Avalia??o espermática e da concentra??o de proteínas solúveis no plasma seminal de bodes da ra?a Alpina em regime de monta controlada
Martins, Leonardo Franco;Pereira, Maria Cristina Baracat;Guimar?es, José Domingos;Costa, Eduardo Paulino da;Silveira, Thiago da Silva;Torres, Ciro Alexandre Alves;Rodrigues, Marcelo Teixeira;Braz, Vandberg Barbosa;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000600011
Abstract: the relationships among soluble proteins of the seminal plasma, the hypoosmotic test, the physical and morphologic analyses of semen and the reproductive performance of male goats of the alpine breed under controlled mating were studied using forty samples of semen from four adult male goats collected twice a week between february and april of 2001. differences among male goats were observed for soluble protein concentration of the seminal plasma, but not for the hypoosmotic test and the pregnancy rate. these results suggest the hypoosmotic test may be used for the evaluation of goat semen, but the protein concentration of the seminal plasma can not be used as a parameter to predict the seminal quality and fertility of male goats of the alpine breed.
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