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Search Results: 1 - 10 of 440026 matches for " J.G. Herrera Haro "
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Prolactin Receptor (PRLR) Gen Polymorphism and Associations with Reproductive Traits in Pigs
A. Barreras Serrano,J.G. Herrera Haro,S. Hori-Oshima,A. Gutierrez Espinosa,M.E. Ortega Cerrilla,J. Perez Perez,C. Lemus Flores,A.L. Kinejara Espinosa,A. Gonzalez Arangure,J.G. Soto Avila
Journal of Animal and Veterinary Advances , 2012,
Abstract: The Prolactin Receptor (PRLR) gene was investigated as candidate gene for swine reproductive traits. 335 sows of 4 genetic groups: Yorkshire (Y), Landrace (L) Duroc (D) and YL were included. The traits studied were: Total Number of Born (TNB), Number Born Alive (NBA), Number of Weaned Piglets (NWP), Litter Weight at Birth (LWB) and Litter Weight at Weaning (LWW). The polymorphism was identified by PCR-RFLP. Allelic frequencies between each genetic group and Hardy-Weinberg equilibrium were tested by chi-square test. The association between PRLR genotypes with reproductive traits was evaluated by a linear model. Additive and dominance effects were estimated. The frequency of A allele was in general 0.46, with variation between genetic groups. D had the highest values for TNB. YL showed the best performance for NBA. AA genotype in D showed the best performance for NWP but no differences were found among genotypes L, YL and L. Differences in first parity were observed between genotypes for TNB, with highest value in BB (10.40 piglets). In general, additive effect per allele A resulted in a negative increase of 2.26 pigs (TNB) and positive of 0.42 kg (LWB) per litter. For TNB and LWB, dominance effect was -2.67 pigs and -0.56 kg, respectively. For LWW, additive in L resulted in -8.37 kg while dominance effect was 8.37 kg.
Growth,Morphometry and Reproductive Performance of Creole Cuino Pigs in Mexico
C. Lemus-Flores,R. Alonso Morales,J.G. Herrera Haro,M. Alonso-Spilsbury,R. Ram?rez-Necoechea,D. Mota-Rojas
Journal of Animal and Veterinary Advances , 2012,
Abstract: Several biotypes of the Mexicanc creole pig are in danger of extinction. This study was carried out in order to characterize the Mexican cuino pig. Growth, morphometry and reproductive traits are statistically described analysing the reproductive performance of 12 Cuino sows kept under confinement conditions. Average live weight was monitored at birth and 6 months later (0.86 and 43.84 kg, respectively). Results show that Cuino pigs tend to deposit more backfat than commercial breeds, their growth rhythm was adjusted to a polynomial equation (Y = 1.1138x2 - 4.0804x + 5.1355 R2 = 0.9955); it is slow at the beginning and after 91 days animals showed an accelerated growth. Average daily feed intake increased until pigs were five months old, from 0.403 to 1.930 kg., with an improved polynomial adjustment (Y = 0.2363x2 - 1.3129x + 5.7951 R2 = 0.82). Feed conversion was 4.596 in the first post-weaning month and 5.174 in the last month of fattening at 6 months. Cuino pigs are small, with short snout and a small number of teats. The variation in all the measured morphological variables was low (7.5 to 16.7%), this suggests that their morphology does not vary much. Prolificity of these pigs was low; the average number of pigs born alive was 4.95 with a litter birth weight of 4.35 kg and 4.12 weaned pigs with 16.09 kg at weaning. Present results indicate that the cuino pig has not been genetically improved since the time it has been in Mexico.
Aggressiveness and Productive Performance of Piglets Supplemented with Tryptophan
G. Martinez-Trejo,M.E. Ortega-Cerrilla,L.F. Rodarte-Covarrubias,J.G. Herrera-Haro,J.L. Figueroa-Velasco,F. Galindo-Maldonado,O. Sanchez-Martinez,A. Lara-Bueno
Journal of Animal and Veterinary Advances , 2012,
Abstract: Early weaning is a common practice in pig farms, this might cause distress and fighting among piglets. The amino acid tryptophan is the precursor of the neurotransmitter serotonin, which has sedative effects that reduce aggression, however, it also has anorexigenic effects that could reduce feed intake and weight gain. In this study, it was evaluated tryptophan supplementation above requirement levels in social behaviour and productive performance of piglets weaned at 21 days of age. Four levels of dietary tryptophan were used (T1, 0.23%, Control; T2, 0.27%; T3, 0.31% and T4, 0.35%). Tryptophan was orally supplemented to each piglet every day. Treatments were randomly assigned to 544 piglets (5.69±1.14 kg) with 8 replicates per treatment. Behavioural observations of piglet activity were done for 6 h daily during four consecutive months, in periods of 8 days, from 14-2 h. Data were analyzed with PROC MIXED according to a completely randomized design with repeated measurements. Aggressiveness measured as biting appendixes (ears and tail) and fighting, were different among treatments (p<0.05) with less activity for T3 (15.10±0.09, 42.19±0.13) and T4 (12.25±0.09, 33.33±0.13%). However, no differences (p>0.05) were found for feed intake, daily weight gain and feed conversion between treatments. Results showed that tryptophan supplementation reduced aggression in weaned piglets, however, there was no change in productive performance.
IDENTIFICATION OF AGRONOMIC MANAGEMENT UNITS BASED ON PHYSICAL ATTRIBUTES OF SOIL
Cucunubá-Melo,J.L; álvarez-Herrera,J.G; Camacho-Tamayo,J.H;
Journal of soil science and plant nutrition , 2011, DOI: 10.4067/S0718-95162011000100008
Abstract: oil palm (elaeis guineensis jacq) is an alternative for the development of productive systems in the tropics. by determining the spatial variability of physical characteristics of soil, specific recommendations for certain areas within a zone can be made. geostatistical analysis can determine the existence and characteristics of the spatial distribution and is an appropriate tool for analyzing the spatial variability of soil properties. the aim of this study was to determine areas with homogeneous physical characteristics in order to establish agricultural management units, using geostatistical techniques. for this study, 62 samples were collected in 10.6 ha in the municipality of el reten (magdalena, colombia). the properties analyzed were: content of sand, silt and clay, particle density, bulk density, total porosity, gravimetric and volumetric water content, hydraulic conductivity and infiltration rate. all properties showed spatial correlation, with adjustments to semivariograms theoretical models, mostly to the spherical model, with ranges between 84.87 and 218.60 m and moderate to strong spatial dependence. the contour maps obtained through ordinary kriging, allowed for the identification of the relationship between the different physical properties of the soil and subsequent classification to determine the agronomic management units (amu).
IDENTIFICATION OF AGRONOMIC MANAGEMENT UNITS BASED ON PHYSICAL ATTRIBUTES OF SOIL
J.L Cucunubá-Melo,J.G álvarez-Herrera,J.H Camacho-Tamayo
Journal of Soil Science and Plant Nutrition , 2011,
Abstract: Oil palm (Elaeis guineensis Jacq) is an alternative for the development of productive systems in the tropics. By determining the spatial variability of physical characteristics of soil, specific recommendations for certain areas within a zone can be made. Geostatistical analysis can determine the existence and characteristics of the spatial distribution and is an appropriate tool for analyzing the spatial variability of soil properties. The aim of this study was to determine areas with homogeneous physical characteristics in order to establish agricultural management units, using geostatistical techniques. For this study, 62 samples were collected in 10.6 ha in the municipality of El Reten (Magdalena, Colombia). The properties analyzed were: content of sand, silt and clay, particle density, bulk density, total porosity, gravimetric and volumetric water content, hydraulic conductivity and infiltration rate. All properties showed spatial correlation, with adjustments to semivariograms theoretical models, mostly to the spherical model, with ranges between 84.87 and 218.60 m and moderate to strong spatial dependence. The contour maps obtained through ordinary kriging, allowed for the identification of the relationship between the different physical properties of the soil and subsequent classification to determine the Agronomic Management Units (AMU).
The origin of cortical neurons
Parnavelas, J.G.;
Brazilian Journal of Medical and Biological Research , 2002, DOI: 10.1590/S0100-879X2002001200003
Abstract: neurons of the mammalian cerebral cortex comprise two broad classes: pyramidal neurons, which project to distant targets, and the inhibitory nonpyramidal cells, the cortical interneurons. pyramidal neurons are generated in the germinal ventricular zone, which lines the lateral ventricles, and migrate along the processes of radial glial cells to their positions in the developing cortex in an `inside-out' sequence. the gaba-containing nonpyramidal cells originate for the most part in the ganglionic eminence, the primordium of the basal ganglia in the ventral telencephalon. these cells follow tangential migratory routes to enter the cortex and are in close association with the corticofugal axonal system. once they enter the cortex, they move towards the ventricular zone, possibly to obtain positional information, before they migrate radially in the direction of the pial surface to take up their positions in the developing cortex. the mechanisms that guide interneurons throughout these long and complex migratory routes are currently under investigation.
Oxidative stress: molecular perception and transduction of signals triggering antioxidant gene defenses
Scandalios, J.G.;
Brazilian Journal of Medical and Biological Research , 2005, DOI: 10.1590/S0100-879X2005000700003
Abstract: molecular oxygen (o2) is the premier biological electron acceptor that serves vital roles in fundamental cellular functions. however, with the beneficial properties of o2 comes the inadvertent formation of reactive oxygen species (ros) such as superoxide (o2·-), hydrogen peroxide, and hydroxyl radical (oh·). if unabated, ros pose a serious threat to or cause the death of aerobic cells. to minimize the damaging effects of ros, aerobic organisms evolved non-enzymatic and enzymatic antioxidant defenses. the latter include catalases, peroxidases, superoxide dismutases, and glutathione s-transferases (gst). cellular ros-sensing mechanisms are not well understood, but a number of transcription factors that regulate the expression of antioxidant genes are well characterized in prokaryotes and in yeast. in higher eukaryotes, oxidative stress responses are more complex and modulated by several regulators. in mammalian systems, two classes of transcription factors, nuclear factor kb and activator protein-1, are involved in the oxidative stress response. antioxidant-specific gene induction, involved in xenobiotic metabolism, is mediated by the "antioxidant responsive element" (are) commonly found in the promoter region of such genes. are is present in mammalian gst, metallothioneine-i and mnsod genes, but has not been found in plant gst genes. however, are is present in the promoter region of the three maize catalase (cat) genes. in plants, ros have been implicated in the damaging effects of various environmental stress conditions. many plant defense genes are activated in response to these conditions, including the three maize cat and some of the superoxide dismutase (sod) genes.
Biodiversity and environmental education: A contradiction?
J.G. Ferreira
Koers : Bulletin for Christian Scholarship , 2002, DOI: 10.4102/koers.v67i3.372
Abstract: The need for the maintenance of biodiversity has become a much-debated environmental concern. However, calling for continued biodiversity exposes one to potential accusations of caring more for the natural environment than for people. This article briefly reviews the development of environmental education and provides an overview of the concepts “biodiversity”, “sustainable development” and “sustainable consumption”. Reasons for maintaining biodiversity while simultaneously allowing for sustainable development and sustainable consumption are considered, but the main purpose of the article is to raise questions about current environmental education practice in South Africa and whether the concern of biodiversity is in actual fact addressed.
Filiation and alliance in three Bororo myths; a reconsideration of the social code in the first chapters of The raw and the cooked
J.G. Oosten
Bijdragen tot de Taal-, Land- en Volkenkunde , 1981,
Abstract:
A. van der Schoor, Het ontstaan van de middeleeuwse stad Rotterdam. Nederzettingsgeschiedenis in het Maas-Merwedegebied van ca. 400-1400. The origins of the Medieval town of Rotterdam. Settlement history in the Maas-Merwede region from ca. 400-1400
J.G. Kruisheer
BMGN : Low Countries Historical Review , 1995,
Abstract:
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