Revistas UPV. Editorial UPV
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Desde esta comunidad se tiene acceso a artículos en texto completo de publicaciones periódicas editadas por diferentes unidades académicas de la Universitat Politècnica de València (UPV) gestionadas en la plataforma OJS a través del portal Polipapers
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Browsing Revistas UPV. Editorial UPV by UPV Entity "Dpto. de Biotecnología"
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- PublicationEffect of divergent selection for uterine capacity on embryonic survival and development at 30 h post-mating in unilaterally ovariectomized rabbit females(Editorial Universitat Politècnica de València, 2015-12-23) Peiró Barber, Rosa María; Gallego, M.; Blasco Mateu, Agustín; Santacreu Jerez, María Antonia; Dpto. de Ciencia Animal; Dpto. de Biotecnología; Instituto Universitario de Conservación y Mejora de la Agrodiversidad Valenciana; Instituto Universitario de Ciencia y Tecnología Animal; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural; Ministerio de Ciencia e Innovación; Ministerio de Educación y Ciencia[EN] Uterine capacity has been proposed as an indirect way to increase litter size. The aim of this work is to study the effect of a divergent selection for uterine capacity (UC) on reproductive traits at 30 h post mating in unilaterally ovariectomized (ULO) females. A total of 62 ULO females from the high line (selected to increase UC) and 39 ULO females from the low line (selected to decrease UC) were used. Ovulation rate was estimated as the number of corpora haemorrhagica and early embryonic survival was estimated as the ratio between number of embryos and ovulation rate. No differences in ovulation rate and early embryonic survival at 30 h post mating were found between high and low lines. Selection for UC did not change the embryonic stage of development either, the majority of embryos being at 4-cell stage. Additionally, the embryos were evaluated according to morphological criteria and more than 95% of the embryos were evaluated as good or fair quality. No differences in embryonic morphological criteria between high and low lines were found either. Thus, selection for UC did not modify the early embryonic survival and development in ULO females at 30 h post mating.
- PublicationEvaluation of calcium superphosphate as an additive to reduce gas emissions from rabbit manure(Editorial Universitat Politècnica de València, 2014-12-22) Estellés Barber, Fernando; Cambra López, María; Jiménez Belenguer, Ana Isabel; Calvet Sanz, Salvador; Dpto. de Ciencia Animal; Dpto. de Biotecnología; Centro Avanzado de Microbiología de Alimentos; Instituto Universitario de Ciencia y Tecnología Animal; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural; Ministerio de Ciencia e Innovación[EN] Techniques to reduce the emission of air pollutants from livestock production are demanded. In this study, the effect of an additive (calcium superphosphate) on gas emissions from rabbit manure was investigated and compared with a control where no additive was used. Calcium superphosphate was applied at a rate of 100 g/m2 per week in a manure pit during 2 cycles of growing rabbits. Manure samples were collected weekly and then chemically and microbiologically analysed. Gas emissions (ammonia, carbon dioxide, methane and nitrous oxide) were determined in 2 open flux chambers. No differences were observed in gas emissions between the treated and control samples except for ammonia emissions, which were reduced by 33% when the additive was applied (P<0.05). No statistical differences were obtained in the microbial content between control and treatment, as results showed a high variability. Dry matter content and pH were the most influential parameters on the emission of gases from manure. According to these results, the application of calcium superphosphate may be considered as an effective technique to reduce ammonia emission from rabbit manure. The additive may also be potentially effective in other species, but additional research is necessary to investigate its performance.
- PublicationThe effect of unilateral ovariectomy on early embryonic survival and embryo development in rabbits(Editorial Universitat Politècnica de València, 2014-06-25) Peiró Barber, Rosa María; Gallego, M.; Blasco Mateu, Agustín; Santacreu Jerez, María Antonia; Dpto. de Ciencia Animal; Dpto. de Biotecnología; Instituto Universitario de Conservación y Mejora de la Agrodiversidad Valenciana; Instituto Universitario de Ciencia y Tecnología Animal; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural; Ministerio de Ciencia e Innovación; Ministerio de Educación y Ciencia[EN] Unilateral ovariectomy can be used to study uterine capacity in rabbits because an overcrowding of the functional uterine horn is produced. Due to the uterus duplex, the rabbit is the ideal model for such studies. However, this technique may affect embryo survival. The aim of this work is to study the effect of unilateral ovariectomy on early embryo survival and development in rabbit. A total of 101 unilateral ovariectomised females and 52 intact females were compared after slaughter at 30 h post-mating. Early embryo survival was estimated as the ratio between number of embryo recovered and ovulation rate. No differences were found between intact and unilaterally ovariectomised females in this trait. Unilateral ovariectomy did not change embryo development, measured as the number of embryo cells. Variability of embryo development was not affected either. At 30 h post-mating, the majority of embryos (86.2%) were 4-cell stage. Embryo quality was evaluated according to morphological criteria. No difference in embryo quality between intact and unilaterally ovariectomised females was found. Therefore, unilateral ovariectomy performed before puberty in rabbit does not modify early embryo survival and development.