|
|
|
| Registros recuperados: 155 | |
|
|
| Lange, Daniel de. |
| Im Jahre 1917 ist in den Anatomischen Heften die bekannte und schöne Arbeit Sobotta’s erschienen über das Vorkommen und die Bedeutung der Ovarialtasche bei den Säugetieren ¹). Das Hauptergebniss dieser Arbeit ist, dass bei alien Säugetieren (vielleicht mit Ausnahne der Primaten und des Menschen) die Ovulation in einer geschlossenen Ovarialtasche stattfinde; dass das Ei im Anfang durch eine Erweiterung der Ampulle aufgesogen und mittels der Peristaltik der Tubamuskulatur durch den isthmischen Teil weiter nach dem Uterus befördert werde. Die Flimmerung des Tubar- und Infundibularepithels scheine gar keine oder eine sehr geringe Rolle bei dem Eitransport zu spielen. Schon aus den Untersuchungen von ZUCKERKANDL (1897) und... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1922 |
URL: http://www.repository.naturalis.nl/record/504079 |
| |
|
|
| Slijper, E.J.. |
| 1. A review is given of some phenomena concerning pregnancy and parturition of the Cetacea, depending on data in literature and on observations made in Antarctic Blue and Fin Whales on board the f.f. “Willem Barendsz” (1946—1947). 2. In Mystacoceti the frequency of twins appears to be less than in man and the big domestic animals. The majority of twins is born by females that are longer than the average female in the period of greatest sexual activity. This does not mean, however, that just as in man most twins are born at an elder age than that corresponding with the maximum of sexual activity. It may also be possible that, just as in the big domestic animals, the ages correspond, but that twins are mostly produced by the physically stronger developed... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1949 |
URL: http://www.repository.naturalis.nl/record/503926 |
| |
|
|
| Utrecht, W.L. van. |
| 1. In Whales variations in the thickness of the baleen plates are supposed to give an insight into certain cyclical processes in the life of the animal. To a certain extent, by means of these variations, it is possible to reach conclusions about the age of the animal and/or about its recent period of life. In order to get a better insight in the significance of the variations in thickness of the baleen plate, researches are made in the histogenesis of the baleen plate of Fin Whales and Blue Whales, caught in the Antarctic waters. The variations in thickness are caused by variations in thickness of the cortex of the baleen plate. 2. The “root” of the baleen plate consists of the following parts: the corium wall, the epithelium that covers the corium wall,... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1965 |
URL: http://www.repository.naturalis.nl/record/504105 |
| |
|
|
| Utrecht-Cock, C.N. van. |
| 1. From Antarctic female Fin Whales, Balaenoptera physalus, a collection, consisting of baleen plates and the parts of these plates embedded in the gum, ovaries, and a number of earplugs was examined, in order to determine the age of these animals and to get a better insight in some characteristics of their reproduction. Data concerning pregnancy and lactation were also recorded. The material was sampled from animals worked up on board the f.f. “Willem Barendsz” during the Antarctic seasons 1953/1954 to 1959/1960 inclusive. The possibilities and values of age determination for this species were considered, based on the results of the analyses of the above material. 2. In most seasons the length distribution of the female Fin Whales, from which the material... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1965 |
URL: http://www.repository.naturalis.nl/record/504146 |
| |
|
|
| Gaisler, Jiří. |
| The present paper gathers the results of a morphological study on 149 specimens of Rhinolophus hipposideros, and of ecological investigations on additional material, incl. some 5,000 banded individuals of the same species. Brief description of the reproductive organs of both sexes is given. The reproductive organs of the sexually mature (adult) and the sexually immature grown-up (subadult) individuals are illustrated and comments are made on their changes during the year. In adult males, the spermatogenesis commences in spring, after the change from winter torpidity to active life, and culminates towards the end of July and in August. During the winter months (December to April), the seminiferous epithelium of the tubules of testes is resting. On the... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1966 |
URL: http://www.repository.naturalis.nl/record/504658 |
| |
|
|
| Utrecht, W.L. van; Utrecht-Cock, C.N. van. |
| 1. From 54 female fin whales chosen at random from a greater number of animals from which data and material were collected during the Antarctic whaling season 1962/1963, records have been made of the baleen plates and the ear plugs. For the records the complete baleen plates including the part of the plates embedded in the gum are used. All ear plugs used for this study were complete and undamaged. 2. According to their ovaries and baleen records 50 animals were sexually mature, 4 animals were sexually immature. 3. In each individual the record of the complete baleen plate is entirely comparable to the record of the ear plug, in its general trend and in the sequence of peaks and hollows. Also the regular cyclic repetition found in the records of the baleen... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1969 |
URL: http://www.repository.naturalis.nl/record/504679 |
| |
|
|
| Hartnoll, R.G.. |
| Corystes cassivelaunus (Brachyura, Corystidae), a crab which burrows in clean sublittoral sand, was investigated at several inshore locations around the Isle of Man. It usually buries itself so as to leave little or no external sign of its presence. Immature crabs remain buried by day throughout the year, as also do mature crabs except during the breeding season from April to June. It is probable that Corystes emerges nocturnally to forage over the surface of the sand. The morphology of the respiratory system, and the respiratory behavior patterns, are both modified on account of the burrowing habit. The food consists almost entirely of burrowing invertebrates, predominantly lamellibranchs, polychaetes and amphipods. There is a puberty-moult in each sex,... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/504521 |
| |
|
|
| Delor, Anne. |
| Désirant acquérir les techniques piscicoles nécessaires pour aborder les problèmes que pose l'élevage des poissons marins, nous avons effectué un stage de formation aux U.S.A. et avons choisi comme sujet d'étude le bar rayé américain (Roccus saxatilis WALB, 1972) dont l'élevage semi-intensif est en plein essor (l). En premier lieu, nous rappellerons quelques données biologiques. C'est un Perciforme de la famille des Serranidés, très abondant sur la côte atlantique des Etats-Unis. On le rencontre depuis le Canada jusqu'au nord de la Floride, ce qui traduit une importante eurythermie. C'est en outre un poisson extrêmement euryhalin: il vit soit en mer, le long des côtes, soit en eau saumâtre, dans les baies et les estuaires et peut remonter très haut... |
| Tipo: Text |
|
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-6672.pdf |
| |
|
|
| Hogendoorn, H.. |
| Poursuivant les travaux en cours sur l'élevage de Clarias lazera (C. et V.) il a été tenté d'accroître l'efficacité de l'alevinage par la reproduction artificielle. L'induction de l'ovulation par une hypophysation, suivie de massages abdominaux et d'une fécondation artificielle, a donné des résultats prometteurs. Mis en incubation, les oeufs ont éclos dans de bonnes conditions, et il a été possible d'entamer une étude sur i'êlevage des alevins. Bien qu'il reste encore un important travail à réaliser, il semble y avoir de bonnes chances de parvenir à résoudre par ce moyen le'problème de l'approvisionnement en juvéniles dans l'élevage de Clarias lazera. |
| Tipo: Text |
|
| Ano: 1977 |
URL: http://archimer.ifremer.fr/doc/00305/41614/40823.pdf |
| |
|
|
| Zohar, Y.; Billard, R.. |
| Some recent findings concerning hormonal treatments inducing or accelerating final stages of gametogenesis in some teleost fish are reviewed. In the rainbow trout and northern pike detailed research using in vivo and in vitro techniques led to a better understanding of the endocrine control of final stages of oogenesis. As a result, exogenous hormonal treatments, composed of a piscine gonadotropin administered alone or followed by 17a-hydroxy-20?-dihydroprogesterone injection were found to be effective inducers of precocious oocyte maturation and ovulation in the carq trout and pike. In all species fertilization rates of ovulated oocytes were high (more than 75 %). In the males of the trout, the pike and the goldfish,... |
| Tipo: Text |
Palavras-chave: Histoire Ifremer. |
| Ano: 1978 |
URL: http://archimer.ifremer.fr/doc/1978/publication-6026.pdf |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Fauvel, Christian; Omnes, Marie-helene; Suquet, Marc; Normant, Yvon. |
| In production operations the application of daily examination of each female of broodstock should be a determinant progress in hatchery management in terms of fry output. The eggs expelled shortly after ovulation by means of a systematic fivefold a week stripping attempt of females, presented a high viability rate (72%) compared to that of eggs collected twice a week (46%) whereas the treatments did not have any effect on female fecundity. Increase of the stripping rhythm brought the hatching rates and broodstock fertilities respectively from 11% to 35% and from 20,000 to 65,000 larvae/kg of spawning female. The enhancement of egg quality and of the resulting larva production is discussed. |
| Tipo: Text |
|
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00170/28129/26346.pdf |
| |
|
|
| Omnes, Marie-helene; Normant, Yvon; Suquet, Marc; Fauvel, Christian. |
| Egg production data from individual hand stripped female turbot were collected and analysed over several consecutive spawning seasons, on natural or shifted conditions. Egg quantity, egg viability and number of spawns were examined from one spawning season to the other, and inside the spawning season. These parameters seemed to increase from a year to the next one, except for the oldest fishes. Spawns were spread over a three-month period and occurred at the same time in the period in successive seasons for most females. Egg production seemed related to the feeding level and the earliness of spawning season appeared depended on the growth rate. Without sand substrate in tanks, injuries could increase therefore no significant differences were observed in... |
| Tipo: Text |
|
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00199/31018/29423.pdf |
| |
|
| |
|
| |
|
|
| PAPA,Frederico Ozanam; LOPES,Maria Denise; ALVARENGA,Marco Antonio; MEIRA,Cezinande de; LUVIZOTTO,Maria Cecília Rui; LANGONI,Hélio; RIBEIRO,Erley Felix; AZEDO,Antonio Esteves; BOMFIM,Antonio Carlos de Miranda. |
| The present study aimed to diagnose early embryonic death in 128 mares. Blood samples were collected at the 4th, 7th, 10th, 13th, 16th, 19th, 21st and 30th day after ovulation and the diameter of the corpus luteum was measured. The diameter and characteristics of the embryonic vesicle were evaluated by ultrasonography. Microbiology, cytology and histopathology were carried out in mares with embryonic death. Plasma oestrogen and progesterone concentration were measured by radioimmunoassay. From 128 mares, 17 (13.28%) showed early embryonic death. The embryonic losses took place at 19 days of pregnancy in 47.05% and at 21 days of pregnancy in 29.4% of the mares. The diameter of the corpus luteum in the mares that maintained... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Embryo mortality; Progesterone; Estrogen; Histopathology; Equine. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961998000400005 |
| |
| Registros recuperados: 155 | |
|
|
|
