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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Role of endothelin 1 in follicular and luteal function in the sheep

Perea-Ganchou, Fernando P. January 2009 (has links)
Thesis (Ph. D.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains x, 158 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 126-158).
42

Mechanisms of reduced luteal sensitivity to PGF₂[alpha] in ruminants

Costine, Beth Alyson, January 2004 (has links)
Thesis (Ph. D.)--West Virginia University, 2004. / Title from document title page. Document formatted into pages; contains xiii, 119 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 95-118).
43

Effects of the oxytocin receptor blocker, atosiban, on function of ovine corpora lutea and responses to prostaglandin F₂ alpha

Mankey, Julie E. January 2009 (has links)
Thesis (M.S.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains viii, 61 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 39-52).
44

Evidence for a systemic embryotoxic effect of early luteal regression in the ewe

Costine, Beth Alyson, January 2000 (has links)
Thesis (M.S.)--West Virginia University, 2000. / Title from document title page. Document formatted into pages; contains viii, 58 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 42-56).
45

The effect and mechanism of action of volatile fatty acids on the catabolism of progesterone

Smith, Darron Louis, January 2005 (has links)
Thesis (Ph. D.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains x, 88 p. : ill. Vita. Includes abstract. Includes bibliographical references.
46

Parâmetros quali-quantitativos na seleção de receptoras em programas de transferência de embriões ovinos /

Oliveira, Thiago Matos de. January 2009 (has links)
Resumo: Objetivou-se avaliar parâmetros quali-quantitativos relacionados à receptora e ao embrião inovulado e a relação destes com as taxas de sobrevivência embrionária ovina. Os parâmetros utilizados foram idade, peso, índice de massa corpórea, escore de condição corporal, número de corpos lúteos no momento da inovulação, aspecto dos corpos lúteos, concentração de progesterona plasmática, intervalo entre o fim do tratamento hormonal e início dos sinais de estro e a duração do estro das receptoras. Os embriões foram avaliados quanto ao estadio de desenvolvimento, qualidade, número de embriões inovulados e estado, congelado ou fresco. Foram utilizados 90 embriões das raças Santa Inês e Dorper, inovulados em receptoras sincronizadas com esponja impregnada com 60 mg acetato de medroxiprogesterona por 14 dias, somado à administração 400 UI de gonadotrofina coriônica equina (eCG) no momento da retirada da esponja. Receptoras com maior índice de condição corporal e maior concentração de progesterona plasmática apresentaram melhor taxa de sobrevivência embrionária e entre esses dois fatores há uma correlação positiva. As demais variáveis relacionadas às receptoras não influenciaram de maneira significativa a taxa de sobrevivência embrionária. O estadio de desenvolvimento embrionário exerceu influência sobre a taxa de sobrevivência embrionária, a taxa de prenhez das receptoras não diferiu em relação à qualidade dos embriões (graus 1 e 2) e aqueles transferidos à fresco resultaram em taxas de sobrevivência superiores quando comparados aos transferidos após serem congelados-descongelados / Abstract: The objective was to evaluate qualitative and quantitative parameters related to recipient and ovulated embryo and their relationship with the rates of embryo survival. The parameters used were: age, weight, body mass index, body condition score, number of corpus luteum at the time of embryo transfer, an aspect of corpus luteum, plasma progesterone concentration, interval between the end of the treatment and early signs of estrus and estrus length of the recipient. The embryos were evaluated for stage of development, quality, number of embryos ovulated and state, frozen or fresh. Were used 90 embryos of Santa Inês and Dorper, ovulated on recipeint synchronized with sponge impregnated with 60 mg medroxyprogesterone acetate for 14 days, added to an administration of 400 IU of equine chorionic gonadotropin (eCG) at the time of sponge removal. Recipient with higher level of body condition score and higher plasma progesterone concentration showed better embryo survival rate and between these two factors is a positive correlation. The other variables related to the recipient did not influence significantly the embryo survival rate. The stage of embryonic development influence upon the embryo survival rate, however, embryos of grades 1 and 2 did not differ in these rates. The fresh embryos had higher survival rates when compared to frozen-thawed embryos / Orientador: Eunice oba / Coorientador: Sony Dimas Bicudo / Banca: Gilson Toniollo / Banca: Maria Inês Souza / Mestre
47

Efeitos do propofol associado ou não ao midazolam, fentanil ou xilazina, na anestesia em ovelhas pré-medicadas com acepromazina /

Horr, Mônica. January 2019 (has links)
Orientador: Newton Nunes / Banca: Patricia Cristina Ferro Lopes / Banca: Paula Ferreira da Costa / Banca: Paulo Aléscio Canola / Banca: Bruno Watanabe Minto / Resumo: Objetivou-se comparar os efeitos do propofol isolado ou associado ao midazolam, fentanil ou xilazina, na indução da anestesia em ovelhas pré-medicadas com acepromazina. Foram utilizados oito animais (n=8) que compuseram quatro grupos, denominados GP, GMP, GFP e GXP, os quais diferenciaram-se de acordo com o protocolo experimental recebido, como segue: propofol isolado, propofol e midazolam (0,2 mg/kg), propofol e fentanil (5 g/kg) ou propofol e xilazina (0,1 mg/kg), pela via intravenosa, respectivamente. O propofol foi admnistrado posteriormente ao bolus, quando presente, e a dose foi calculada pelo volume infundido. As ovelhas participaram de todos os grupos, respeitando um intervalo de sete dias entre os tratamentos. Foram mensurados parâmetros hemogasométricos e cardiorrespiratórios. Tais dados foram coletados antes da sedação sem qualquer utilização de fármacos, definido como momento basal (Mbasal), 15 minutos após a administração de acepromazina (M15), imediatamente após a indução anestésica, onde realizou-se a intubação (Mint0), 5 minutos após (Mint5), imediatamente após a extubação (Mext0), 10, 20 e 30 minutos após a extubação (Mext10, Mext20 e Mext30), respectivamente. Adicionalmente foram dosados os valores de lactato e glicemia nos momentos Mbasal, M15, Mint0, Mext0 e Mext30. Complementarmente, foram avaliados o período de recuperação e escores de qualidade de intubação e recuperação. A dose do propofol necessária para a intubação orotraqueal foi mensurada em todos... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The aim of the present study was to compare the effects of popofol alone or in association with midazolam, fentanyl or xylazine for induction anesthesic in sheep pre-medicated with acepromazine. Eight animals (n = 8) were distribuited in four groups: GP, GMP, GFP and GXP, according to the experimental protocol, as follows: propofol, propofol and midazolam (0.2mg/kg), propofol and fentanyl (5 g/kg) or propofol and xylazine (0.1mg/kg), intravenously, respectively. Propofol was administered post bolus, when present, and the dose was calculated by volume infused. The sheeps participated in all groups, respecting a seven-day interval between treatments. Blood gas and cardiorespiratory parameters were measured. These data were collected before sedation and defined as baseline (Mbasal), 15 minutes after acepromazine (M15), immediately after anesthetic induction, where an intubation was performed (Mint0), 5 minutes after (Mint5), immediately after extubation (Mext0), 10, 20 and 30 minutes after extubation (Mext10, Mext20 and Mext30), respectively. In addition, lactate and glucose values were measured at Mbasal, M15, Mint0, Mext0 and Mext30. Recovery period and intubation and recovery quality scores were evaluated. The dose of propofol required for orotracheal intubation was recorded. Data with Gaussian distribution were analyzed statistically by analysis of variance (Two-way ANOVA) followed by the Tukey test. For the evaluation of non-parametric data, the results were analyzed by Kr... (Complete abstract click electronic access below) / Doutor
48

Ovine pituitary responsiveness to gonadotropin releasing hormone during lactational anestrus /

Knipe, Richard Kee January 1980 (has links)
No description available.
49

A study of factors affecting embryonic, fetal and lamb survival in high fecundity merino ewes

Kleemann, D. O. January 1994 (has links) (PDF)
Bibliography : leaves 120-133. Defines the sources of reproductive wastage in FecB FecÊ Booroola Merino x South Australian Merino ewes and examines factors associated with the survival of embryos, fetuses and lambs with the aim of improving net reproduction efficiency. Experiments were conducted to define the problem; to examine factors affecting embryonic and fetal loss; and, to investigate factors influencing wastage at lambing.
50

Short-term nutrition and its effect on ovulation in the ewe

Nottle, Mark Brenton. January 1988 (has links) (PDF)
Includes bibliographical references (leaves 143-165) Reports on studies undertaken to examine the physiological basis of the known ability of lupin grain to increase ovulation rate in the ewe.

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