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Search Results: 1 - 10 of 220356 matches for " Córdova-Izquierdo "
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Bienestar y reproducción animal
Córdova-Izquierdo, Alejandro
REDVET , 2008,
Abstract: It can be defined Animal welfare (AW), as the stage of complete physical and mental health of the animals where is in complete harmony with their atmosphere. The correct well-being should fulfill appropriate requirements as: I manage, food and transport, treatment, prevention of illnesses, appropriate facilities for their development and their comfort. The general objective of the BW, is to avoid the pain or unnecessary suffering above all and to force as much to the proprietors as to the caretakers of animals, torespect minimum requirements of welfare. In this work, aspects related with the strss are approached - answer of the animals in the face of any factor of the environment - that rebound with the welfare and reproductive acting of the domestic mammals in the Units of Animal Production (UAP).
Environmental Stress Effect on Animal Reproduction  [PDF]
Córdova-Izquierdo Alejandro, Villa-Mancera Abel, Olivares Pérez Jaime, Sánchez-Aparicio Pedro
Open Journal of Animal Sciences (OJAS) , 2014, DOI: 10.4236/ojas.2014.42011
Abstract: The aim of this review is to present some aspects of environmental stress effect on reproduction of farm animals. It describes the following: neuroendocrinology of stress, types of stress, stress characteristics in the reproductive process and recommendations for control environmental stress. Stress is the result of confinement and an ambitious vision and uncaring by the man, who is in the interest of improving production, has participated unconsciously, by manipulating animal production in its way, even trying to tame new species, impossible to adapt to our environment healthy. At present, it has been concluded that stress is one of the environmental factors that affect handling and decrease the production of livestock, it is considered that the main factor which should be controlled in units animal production, since it is closely related to pathogens and infectious agents that may try to the health of animals. Finally, some recommendations are outlined to lessen stress for heat, by handling and by feeding.
Efecto de factores climáticos sobre la conducta reproductiva bovina en los trópicos. Una revision – Effect of climatic factors on bovine reproductive performance in the tropics. A review
Córdova-Izquierdo, Alejandro,Murillo Medina, Aída Lorena,Castillo Juárez, Héctor
REDVET , 2012,
Abstract: RESUMENEl comportamiento reproductivo de los bovinos en los trópicos, se logra cuando los animales muestran al máximo su potencial reproductivo; sin embargo, las condiciones en los agroecosistemas existentes pueden presentar limitantes a la manifestación máxima de ese potencial.ABSTRACTReproductive performance of cattle in the tropics, is achieved when the animals show their full reproductive potential, but the conditions existing in agroecosystems may have limitations on the maximum manifestation of that potential.
Comportamiento reproductivo de razas bovinas de carne europeas en condiciones de trópico húmedo mexicano (Reproductive behavior of european bovine races of meat under conditions of tropic humid mexican)
Córdova-Izquierdo Alejandro,Saltijeral-Oaxaca Jorge,Rodríguez –Ariza Gustavo,Córdova-Jiménez Mary Silvia
REDVET , 2005,
Abstract: El objetivo de este trabajo fue valorar el comportamiento reproductivo de razas bovinas europeas introducidas a condiciones de trópico húmedo mexicano. Se emplearon 36 novillonas prepúberes de raza Charolais, 2 sementales de la misma raza y 2 sementales de raza Limousin. Las vaquillas y los 2 sementales de la raza Charolais oscilando entre 250-310 kg. de peso corporal, con una edad promedio entre los 13 meses; los 2 sementales de raza Limousin con peso entre 480-500 Kg. y una edad de 20 meses promedio. El estudio se realizó en el Estado de Campeche, México, donde se valoró el comportamiento reproductivo de las novillonas, hasta alcanzar la madures sexual y empadre por mota directa. Posteriormente se evaluó diagnóstico de gestación por palpación rectal y se obtuvo el porcentaje de fertilidad, de 30.5%, aunque este porcentaje es bajo, estos resultados indican la posibilidad de introducir vaquillas Bos taurus al trópico húmedo sin problemas reproductivos, como días a primer calor, tiempo de empadre por mota directa y de comportamiento en ciclos estrales; no obstante, debe ser tomado en cuenta las condiciones físicas y biológicas de los animales y del medio en el cual se encuentren. The objective of this work was to value the reproductive behavior of races bovine Europeans introduced to conditions of tropic humid Mexican. 36 heifers of Charolais race, 2 sires of the same race and 2 sires of race Limousin was used. The heifers and the 2 sires of the race Charolais oscillating among 250-310 kg. of corporal weight, with an age average among the 13 months; the 2 sires of race Limousin with weight among 480-500 Kg. and an age of 20 months average. The study was carried out in the State of Campeche, Mexico, where the reproductive behavior of the heifers was valued, until reaching the you mature sexual and pair for direct mount. Later on it was evaluated diagnostic of gestation for rectal palpation and the percentage of fertility was obtained, of 30.5%, although this percentage is low, these results indicate the possibility to introduce heifers Bos taurus to the humid tropic without reproductive problems, as days to first heat, time of pair for direct mount and of behavior in oestrus cycles; nevertheless, it should be taken into account the physical and biological conditions of the animals and of the means in which you/they are.
El binomio adaptación-estrés y el bienestar animal como ejes en la educación veterinaria - The binomial stress-adaptation and animal welfare as axes in veterinary education
Córdova-Izquierdo, Alejandro,Ruiz Lang, Claudio Gustavo,Xolalpa Campos, Víctor,Cortés Suárez, Saúl
REDVET , 2010,
Abstract: ResumenLa organización tradicional de la ense anza superior en medicinaveterinaria, por lo general, ha propiciado un desarrollo limitado de los estudiantes, ya que sólo favorece la aparición de un pensamiento empírico ligado a explicaciones de casos aislados, no de un pensamiento dirigido a lo esencial o común en los contenidos curriculares. Otros problemas identificados son la pobre motivación y la deficiente orientación en el objeto de estudio para identificar problemas y proponer soluciones viables en el contexto real en que actúa un profesional. Los currículos desde la concepción tradicional están sobrecargados de información, la actividad está centrada en la ense anza del profesor y promueven una posición receptiva del alumno. Del planteamiento anterior se desprende la propuesta de considerar al binomio adaptación-estrés y el bienestar animal como ejes en la formación de los médicos veterinarios. En esta concepción se considera al Sistema nervioso autónomo (SNA) como un elementocentral para explicar las reacciones de los animales ante los estímulos ambientales. El término sistema nervioso autónomo fue acu ado por Langley (principios del siglo XX), para distinguir la porción del sistema nervioso, que no está bajo el control voluntario y que funciona como un sistema eferente (motor), transmitiendo se ales de control a todo el organismo, con excepción del músculo estriado. SummaryThe traditional organization of higher education, has led to limiteddevelopment of students, and that only encouraged the emergence of anempirical thought linked to explanations of isolated cases, not a thought to the essential and common in curriculum content. Other problems identified include poor motivation and poor orientation toward the object of study to identify problems and propose solutions in the context in which it operates a real professional. Curricula from the traditional concept is overload of information, the activity is focused on teacher activity and promoting a passive student. The approach above is the proposal to consider the binomial-stress adaptation and animal welfare as axes in the education of veterinarians. In this proposal the autonomic nervous system (ANS) isconsidered as a key to explain the reactions of animals to environmental stimuli. The term autonomic nervous system was coined by Langley (early twentieth century), to distinguish the portion of the nervous system, which is not under voluntary control and that functions as an efferent (motor) system, to transmit control signals to the whole organism with the exception of striated muscle.
Estrés oxidativo en gametos - Oxidative stress in gametes
Córdova-Izquierdo Alejandro,Saltijeral Oaxaca Jorge A,Ruiz Lang Gustavo,Pe?a Betancourt Silvia Denise
REDVET , 2010,
Abstract: ResumenEn la actualidad, la Comunidad Científica Internacional, está preocupada poraumentar la eficiencia reproductiva y productiva de los animales deimportancia económica para el hombre; preocupación dirigida a laobtención de más y mejores ganancias para el ganadero, mediante elaumento de la producción de alimentos de origen animal de mejor calidadpara el consumidor de cualquier parte del mundo. Sin embargo, lanecesidad de producir más alimentos y de mejor calidad en un tiemporelativamente corto, ha llevado a los especialistas en producción animal a laintensificación, tecnificación e industrialización de las unidades deproducción animal (UPAS) en todo el mundo, lo cual ha conducido a lapresencia de grandes aglomeraciones de los animales en las UPASinmensamente grandes; cuyas consecuencias son el estrés oxidativo crónicoy permanente para los animales, repercutiendo severamente en sudesempe o reproductivo y como consecuencia en la cantidad y calidad en la producción de gametos. Por lo cual, la Comunidad Científica Internacional,está preocupada por realizar investigaciones que conduzcan a proponeralternativas para disminuir el estrés oxidativo de los animales en las UPAS,mejorando su fertilidad, mediante la mejor producción en cantidad y calidadde gametos, factibles de ser utilizados para aprovechar mejor el potencialbiológico de los animales. En este trabajo, se presentan aspectos generalesde la importancia del estrés oxidativo en gametos.SummaryAt present, the international scientific community is concerned aboutincreasing the reproductive efficiency and productivity of animals ofeconomic importance to humans, concern directed to obtaining more andbetter profits for the farmer, through increased food production animal bestquality for the consumer from anywhere in the world. However, the need toproduce more food and better quality in a relatively short time, has ledspecialists in animal production intensification and industrializationtechnification animal production units (UPAS) throughout the world, whichhas led to the presence of large groups of animals in UPAS immenselylarge, whose consequences are chronic and permanent oxidative stress toanimals, severely impacting the reproductive performance and consequentlyon the quantity and quality in the production of gametes. Therefore, theinternational scientific community is concerned by research leading topropose alternatives to reduce oxidative stress in UPAS animals, improvingtheir fertility by better production quality and quantity of gametes that canbe used to exploit the biological potential of the ani
Effect of the Type of Straw on the Spermatic Quality in the Freezing of Boar Semen
A. C rdova-Izquierdo,M.S. C rdova-Jim nez,C.A. C rdova-Jim nez,J.E. Guerra-Liera
Journal of Animal and Veterinary Advances , 2012,
Abstract: With the freezing boar semen, could have better options for the optimization of the reproductive handling in the swinish species as well as an alternative for the development of this cattle activity; using technologies like the implementation of banks of frozen of races with characteristic zootechnic of economic importance that guarantee the readiness of germinal material in the moment that is required, to have germinal material of males proven genetically, still when the animal no longer exists, to overcome certain intentional restrictions of transport of alive animals, for the problem of transmission of illnesses and, to overcome the restrictive of time of viability of the diluted fresh semen. In this work was examined the effect of the freezing boar semen in straws plastic of 0.5 and 5 mL on the Motility and the Acrosome Integrity (NAR). For it, 9 were used ejaculated of different animals, the experiment was carried out comparing fresh semen with thawing semen coming from straws of 0.5 and 5 mL. The results of percentages of motility and NAR for fresh and thawing semen, were of 86.19, 47.14 and 47.14, for straws of 0.5 mL and 75.62, 48.19 and 46.81, for straws of 5 mL. When carrying out the analysis of the variance and the test of multiple comparisons it was found that the freezing of the semen in both straws types, the percentages of motility and NAR reduce, with regard to the fresh semen; however, the macrotubes or straws of 5 mL, represent a good option in the artificial insemination using boar semen frozen-thawing.
Conservación seminal de mamíferos domésticos (Seminal conservation of domestics mammalia)
Alejandro Córdova-Izquierdo,Mary Silvia Córdova-Jiménez,Cristian Alejandro Córdova-Jiménez,Juan Eulogio Guerra Liera
REDVET , 2006,
Abstract: En este trabajo, se hace una revisión de las principales biotecnologías con posibilidad de aplicación a producción animal, como: clonación, inseminación artificial (IA), fecundación in vitro, cultivo in vitro de embriones, inyección intracitoplasmática espermática, sexaje de espermatozoides y de embriones; situación mundial de la inseminación artificial porcina; se presentan las causas primarias y secundarias que limitan el uso del semen congelado de porcino en la IA; principales actividades de la conservación seminal en el presente y el futuro; los antioxidantes en la conservación seminal, como una alternativa para la conservación de semen de mamíferos domésticos. In this work, a revision of the main biotechnologies is made with application possibility to animal production, as: cloning, artificial insemination (AI), in vitro fecundation, in vitro cultivation of embryos, intracytoplasmic sperm injection, sexing of sperms and of embryos; world situation of the swinish artificial insemination; the primary and secondary causes are presented that limit the use of the frozen semen of swinish in the AI; main activities of the seminal conservation presently and the future; the antioxidants in the seminal conservation, like an alternative for the conservation of semen of domestic mammals
Efecto del método de obtención de semen de ovino sobre la calidad espermática (Effect of the method of obtaining of ovine semen on the spermatic quality)
Córdova-Izquierdo, Alejandro1*; ; ; y,Saltijeral Oaxaca, Jorge,Mu?oz Mendoza, Ramiro,Córdova-Jiménez, M. Silvia
REDVET , 2006,
Abstract: La colecta del semen del ganado ovino, ayuda a identificar problemas relacionados con el desempe o reproductivo de estos animales. Se han utilizado diferentes pruebas laboratoriales, para valorar la calidad seminal de los ovinos y poder realizar predicciones indirectas del potencial reproductivo de los machos reproductores; no obstante, su naturaleza subjetiva, no asegura el poder de fecundación de los machos. El objetivo de este trabajo fue valorar el efecto del método de obtención del semen de ovinos sobre la calidad espermática. Se empelaron 10 machos ovinos de la raza Suffolk de una Unidad de Producción Ovina, ubicada en el Estado de México, México. Para la recolección seminal se utilizó vagina artificial y directamente de la vagina, después de la monta natural. El semen fue valorado macro y microscópicamente. Los resultados promedios fueron, para vagina artificial: volumen 1.11 ml, pH 6.62, motilidad 64.5 %, concentración de espermatozoides/ml 206.4 x106, vivos 68.5 %, Muertos 31.87% y anormalidades 23.96%; directamente de la vagina: volumen 0.57 ml, pH 6.75, motilidad 60.4%, concentración de espermatozoides/ml 176.02 x 106, vivos 62.62 %, muertos 37.27% y anormalidades 11.12%. Los resultados indican que los resultados obtenidos con vagina artificial fueron los mejores. The collection of the semen of the livestock ovine, helps to identify problems related with the reproductive acting of these animals. They have been used different you prove laboratories, to value the seminal quality of the ovines and power to carry out indirect predictions of the reproductive potential of the reproductive males; nevertheless, its subjective nature, doesn't assure the power of fecundation of the males. The objective of this work was to value the effect of the method of obtaining of the ovines semen on the spermatic quality. You empelaron 10 male ovines of the race Suffolk of a Unit of Production Ovine, located in the State of Mexico, Mexico. For the seminal gathering artificial vagina was used and directly of the vagina, after it mounts it natural. The semen was valued macro and microscopically. The results averages were, for artificial vagina: volume 1.11 ml, pH 6.62, motility 64.5%, concentration of sperms/ml 206.4 x106, alive 68.5%, Dead 31.87% and abnormalities 23.96%; directly of the vagina: volume 0.57 ml, pH 6.75, motility 60.4%, sperms/ml concentration 176.02 x 106, alive 62.62%, dead 37.27% and abnormalities 11.12%. The results indicate that the results obtained with artificial vagina were the best.
Sperm Quality in Holstein Bulls Friesian and Brahmans of Frozen Semen Commercially  [PDF]
Alejandro Córdova-Izquierdo, Gustavo Ruiz-Lang, Román Espinosa-Cervantes, Adrían Emmanuel Iglesias-Reyes, Maximino Méndez-Mendoza, Rubén Huerta-Crispín, Abel Edmundo Villa-Mancera, Ma. De Lourdes Juárez-Mosqueda, Pedro Sánchez-Aparicio, Jaime Olivares-Pérez, Juan Eulogio Guerra-Liera, Gerardo Cansino-Arroyo
Open Journal of Animal Sciences (OJAS) , 2015, DOI: 10.4236/ojas.2015.53026
Abstract: The aim of this study was to assess sperm quality (motility, viability and acrosomal integrity) sperm from commercially frozen semen straws two breeds of bulls Bos taurus (holstein Frisian) and Bos indicus (Brahman). 9 commercial straws 0.5 ml of Holstein bull semen and 9 Brahman bull were thawed, they were kept for two hours at room temperature and motility, viability and acrosomal integrity (NAR) was assessed. The results were 30% motility, viability 40% and 30% of NAR in the Holstein breed. Brahma race for motility 40%, 50% and 40% viability was obtained NAR. In conclusion, according to the results of the variables analyzed, the Brahman breed in sperm quality was better than the Holstein breed; however, the results of both races meet minimum standards of quality sperm for use in artificial insemination (AI) field level.
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