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Search Results: 1 - 10 of 14807 matches for " Santiago ángel; Uribe-Velásquez "
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Parámetros metabólicos séricos y condición corporal durante el pre y posparto en vacas Brahman: Serum Metabolic Parameters and Body Condition During Pre and Postpartum in Brahman Cows
Giraldo Salazar,Luis Fernando; Loaiza Echeverri,Ana María; Botero,Santiago ángel; Uribe-Velásquez,Luis Fernando;
Revista Científica , 2009,
Abstract: to describe the changes in the energy metabolism from one month prior to calving up and one month postpartum and its relation with possible body condition changes, twenty brahman cows were selected from magdalena medio, in colombia. venous blood samples (10 ml) using vacutainer? system were taken four weeks prior to calving and four weeks postpartum. glucose, triglycerides, total cholesterol concentrations, high-density lipoproteins (hdl), low-density lipoprotein (ldl), very low-density lipoprotein (vldl) and body condition (bc) were evaluated. twenty cows were distributed in two groups (1: ≤ 7 bc and 2: ≥ 8 bc). the results were analyzed using analysis of the variance and duncan test. it was observed significant reduction (p<0.05) in the glucose values and highly significant (p<0.005) in hdl lipoprotein fraction more visible in low bc cows. in addition highly significant increase (p<0.005) in ldl fraction concentrations, more visible in high bc cows. in the others parameters no were appreciated significant changes. in conclusion, brahman cows of this study showed a moderate negative energy balance that doesn?t affect the energy body reserves due to low milk production and adequate nutrition. brahman cows with loss of body condition during the experimental period (≤ 7) presented more problems to obtain energy balance.
Perfil hormonal de Progesterona durante o ciclo Estral em novilhas Nelore confinadas com Diferentes Ondas de Crescimento Folicular
Santiago Luciene Lomas,Torres Ciro Alexandre Alves,Uribe-Velásquez Luiz Fernando,Cecon Paulo Roberto
Revista Brasileira de Zootecnia , 2001,
Abstract: Efetuaram-se coletas diárias de sangue, de 16 novilhas Nelore confinadas, para análise de progesterona plasmática pelo método de radioimunoensaio (RIA). Os dias analisados para progesterona foram o dia zero (estro) e a cada três dias até o dia -1 e o dia zero. Os animais foram divididos em dois grupos: 1) com ciclo estral de 21 dias aproximadamente (novilhas que apresentaram duas e três ondas de crescimento folicular) e 2) com ciclo estral superior a 25 dias (novilhas com quatro ondas de crescimento folicular). As concentra es médias de progesterona plasmática dos animais durante o ciclo estral diferiram entre os dois grupos, sendo superiores (4,27 ng/mL) para os ciclos de maior dura o. A concentra o média de progesterona no ciclo de aproximadamente 21 dias foi de 2,54 ng/mL. Os resultados sugerem que as novilhas que apresentam maior dura o do ciclo estral necessitam de tempo adicional para que seus folículos cheguem ao estádio pré-ovulatório, havendo, dessa maneira, prolongamento e aumento da secre o de progesterona.
Perfil hormonal de Progesterona durante o ciclo Estral em novilhas Nelore confinadas com Diferentes Ondas de Crescimento Folicular
Santiago, Luciene Lomas;Torres, Ciro Alexandre Alves;Uribe-Velásquez, Luiz Fernando;Cecon, Paulo Roberto;Nogueira, Eduardo Terra;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000800009
Abstract: blood were collected daily from 16 nelore heifers confined, for radioimmunoassay (ria).analyses of progesterone the plasma progesterone assay were at day zero (estrus) and at each three days until the -1 and the day zero.again the animals were divided in two groups: 1) with regular estrous cycle of 21 days (heifers with two and three follicular growth waves) and 2) with prolonged estrous cycle, greater than 25 days (heifers with four follicular growth waves). the mean plasma progesterone level from the animals during the estrous cycle differed between the two groups, being greater (4,27 ng/ml) for the extended cycles.(above 25 days; 4,27 ng/ml) than for the regular estrous cycle (21 days; 2,54 ng/ml). results suggest that those heifers which showed an extended estrous cycles, needs an additional time for the follicles to each the pre-ovulatory stadium, resulting in prolonged and increased progesterone secretion.
USO DE LA ESPECTROMETRíA DE MASAS EN TáNDEM PARA LA DETERMINACIóN DE AMINOáCIDOS EN CANINOS
Osorio,Jose Henry; Uribe-Velásquez,Luis Fernando;
Biosalud , 2009,
Abstract: the measurement of blood amino acids is a basic test for the detection of inherited inborn errors related to some amino acids metabolism and organic acidurias. the objective of the present study was to establish reference values for amino acids in blood of canines using tandem mass spectrometry. blood samples from 60 normal canines over 18 moths of age (30 male and 30 female) were obtained, and dried blood spots were prepared for amino acids analysis by tandem mass spectrometry. no significant differences between sexes were found. reference values for amino acids in canines using this technique are provided. tandem mass spectrometry is an important tool for the diagnosis of metabolic disorders.
LA CONDICIóN CORPORAL COMO HERRAMIENTA PARA PRONOSTICAR EL POTENCIAL REPRODUCTIVO EN HEMBRAS BOVINAS DE CARNE
Correa-Orozco,Adriana; Uribe-Velásquez,Luis Fernando;
Revista Facultad Nacional de Agronomía, Medellín , 2010,
Abstract: the objective of this review is to describe the effect of body condition score (bcs) on reproductive performance and endocrine function of beef cows. interval to first estrus and ovulation, interval from parturition to normal luteal activity and to conception are shorter for moderate body condition cows than thin cows. size of the dominant follicle at the first estrus is larger and pregnancy rate is greater for moderate condition cows as compared with thin cows. in addition has been studied to effects of bcs on secretion of luteinizing hormone, estradiol, leptin, insulin and insulin-like growth factor i (igf-i). the program for induction of ovulation can increase the pregnancy rate in beef cows in poor body condition. however, the effectiveness of the protocol for inducing estrus and ovulation is dependent on body condition. in conclusion, the bcs is a useful indicator of energy status and breeding potential, because of the effect on follicular dynamic, ovarian activity, endocrine function and pregnancy rate in beef cows.
LA CONDICIóN CORPORAL COMO HERRAMIENTA PARA PRONOSTICAR EL POTENCIAL REPRODUCTIVO EN HEMBRAS BOVINAS DE CARNE BODY CONDITION SCORE AS TOOL TO PREDICT THE REPRODUCTIVE POTENTIAL OF BEEF COWS
Adriana Correa-Orozco,Luis Fernando Uribe-Velásquez
Revista Facultad Nacional de Agronomía, Medellín , 2010,
Abstract: El objetivo de esta revisión es describir el efecto de la condición corporal (CC) sobre el desempe o reproductivo y la función endocrina en vacas de carne. Los intervalos parto al primer estro y ovulación, intervalos desde el parto a la actividad luteal normal y a la concepción son más cortos en vacas con CC moderada cuando son comparados con vacas delgadas. El tama o del folículo dominante al primer estro es más grande y la tasa de pre ez es mayor para vacas con condición moderada en comparación con vacas delgadas. Además, han sido estudiados los efectos de la CC sobre la secreción de hormona luteinizante, estradiol, leptina, insulina y factor de crecimiento semejante a la insulina I (IGF-I). El programa para inducción de la ovulación puede aumentar la tasa de pre ez en vacas de carne con CC pobre. Sin embargo, la eficacia del protocolo para inducir el estro y la ovulación es dependiente de la CC. En conclusión, la CC es un indicador útil del estado de energía y potencial reproductivo, por sus efectos sobre la dinámica folicular, actividad ovárica, función endocrina y tasa de pre ez en vacas de carne. The objective of this review is to describe the effect of body condition score (BCS) on reproductive performance and endocrine function of beef cows. Interval to first estrus and ovulation, interval from parturition to normal luteal activity and to conception are shorter for moderate body condition cows than thin cows. Size of the dominant follicle at the first estrus is larger and pregnancy rate is greater for moderate condition cows as compared with thin cows. In addition has been studied to effects of BCS on secretion of luteinizing hormone, estradiol, leptin, insulin and insulin-like growth factor I (IGF-I). The program for induction of ovulation can increase the pregnancy rate in beef cows in poor body condition. However, the effectiveness of the protocol for inducing estrus and ovulation is dependent on body condition. In conclusion, the BCS is a useful indicator of energy status and breeding potential, because of the effect on follicular dynamic, ovarian activity, endocrine function and pregnancy rate in beef cows.
Factores que afectan la pre ez en vacas Brahman sometidas a inseminación artificial a tiempo fijo
Adriana Correa-Orozco,Luis Uribe-Velásquez,Erik Pulgarín-Velásquez
Revista MVZ Córdoba , 2013,
Abstract: Objetivo. Evaluar la relación entre la condición corporal (CC), la manifestación de estro, las concentraciones plasmáticas de estradiol, el diámetro del folículo mayor y la pre ez, en vacas Bos indicus amamantando, sometidas a un protocolo de inseminación artificial a tiempo fijo (IATF). Materiales y métodos. Treinta y ocho vacas Brahman recibieron un dispositivo intravaginal de progesterona + benzoato de estradiol en el día 0; retiro del dispositivo + dinoprost + gonadotropina coriónica equina en el día 9 y la IATF en el día 12. La pre ez fue diagnosticada 90 días después de la IATF. Resultados. No hubo efecto de la CC sobre la manifestación de estro, las concentraciones plasmáticas de estradiol o el diámetro del folículo mayor (p>0.05). El diámetro del folículo mayor no influenció las concentraciones plasmáticas de estradiol (p>0.05). El diámetro del folículo mayor y las concentraciones plasmáticas de estradiol no influenciaron la manifestación de estro (p>0.05). La tasa de pre ez por IATF no fue afectada (p>0.05) por la CC, la manifestación de estro o las concentraciones plasmáticas de estradiol. Hubo una tendencia (p=0.10) de una relación directa entre el diámetro del folículo mayor y la tasa de pre ez por IATF. Conclusiones. La CC, las concentraciones plasmáticas de estradiol y la manifestación de estro no influenciaron la tasa de pre ez por IATF en vacas Brahman sometidas a un protocolo de sincronización basado en progesterona. Sin embargo, el diámetro del folículo mayor presentó tendencia al impacto positivo sobre la tasa de pre ez por IATF.
CARACTERíSTICAS DEL CRECIMIENTO FOLICULAR OVáRICO DURANTE EL CICLO ESTRAL EN OVEJAS
Uribe-Velásquez,Luis Fernando; Correa-Orozco,Adriana; Osorio,José Henry;
Biosalud , 2009,
Abstract: in most domestic animals, the later stages of follicle development appear to have a wave-like pattern during the estrous cycle. a follicle wave is characterized by the synchronous growth of a cohort of follicles, one (or a species-specific number) which continues growing (dominant follicle), while the others regress due to development inhibition (subordinate follicles). follicular function has been widely studied in sheep, although the description of the follicular development pattern has been controversial in early studies. some authors described follicular growth as continuous and independent of the cycle stage. other studies were supportive of a wave-like pattern. currently, there is a general agreement that reconciles both viewpoints, which is based on the high variability in the number of cohorts developing in each wave (the cohort of follicles) and the high variability in the number of cohorts developing in each estrous cycle. in this way, follicles > 5 mm in diameter would exhibit a wave-like pattern, whilst follicles smaller than 4 mm would grow randomly. most studies describe two to four follicle waves during the estrous cycle, with one study describing up to six waves per cycle. follicular selection is the process that results in a decrease in the number of growing follicles in a wave according to the species-specific number of follicles that ovulate. during the estrous cycle, the dominant and largest subordinate follicles reach maximum diameters of 5-7 and 3-5 mm, respectively. in many cases the ovulatory follicles develop from a cohort of follicles from the last follicular wave. however, the ovulatory follicles can also derive from the second-to-last follicular wave. understanding the pattern of follicle development in small ruminants is increasingly important for designing improved methods to manipulate reproduction and production.
MECANISMOS INTRACELULARES INVOLUCRADOS EN EL APRENDIZAJE Y LA MEMORIA DEL MIEDO
Sánchez-Ramírez,Juan David; Uribe-Velásquez,Luis Fernando;
Biosalud , 2010,
Abstract: the neurobiology of fear is a large cellular configuration that implies the group activity of a large number of neurons. these connections suffer changes along the life cycle in a cellular activity-dependant process. this changes the effectiveness of the synaptic communication, facilitating the unchaining process of fear. hence, the objective of this review is to describe the physiological process that cause those changes in fear, which begin with the activation of ionics and metabotropics receptors, and ending with the genomic stimulation and protein synthesis. additionally, this paper explains the relation of fear while memories associated with it are established, as a factor that contributes to a higher frequency of discharging and cellular depolarization that favors long term changes due to intense neural excitation. in conclusion, fear can be neurobiologically strengthened after aversive stimulations, by the formation of associations between stimuli, as well as between them and the context, encouraging the organism to have a more efficient reactivity regarding a later meeting with the same threat or circumstance.
EL CUERPO LúTEO: UNA VISIóN INMUNOLóGICA
Uribe-Velásquez,Luis Fernando; Osorio,José Henry; Correa-Orozco,Adriana;
Biosalud , 2011,
Abstract: the aim of the present review is to describe the current concepts of the local mechanism for the cascade of development and regression of the corpus luteum (cl) as regulated by macrophages, immunological cells and cytokines. the cow cl is a dynamic organ which has a life time of approximately 17-18 days. the main function of the cl is to secrete a large amount of progesterone (p4). as the cl matures, the steroidogenic cells establish contact with many capillaries and the matured cl is composed of many vascular endothelial cells that account for up to 50 % of all cl cells. in cattle and other species, the cl plays a central role in the regulation of cyclicity and maintenance of pregnancy. in many species, luteal regression is initiated by uterine release of pgf2α, which inhibits steroidogenesis and may launch a cascade of events leading to the tissue final disappearance. immune cells, primarily macrophages and t lymphocites are important for ingestion of cellular remnants that result from the death of luteal cells. macrophages are multifunctional cells that play key roles in the immune response and are abundant throughout female reproductive tissues. their specific localization and variations in distribution in the ovary during different stages of the cycle, suggest that macrophages play diverse roles in intra-ovarian events including folliculogenese, tissue restructuring at ovulation and cl formation and regression.
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