1,369 research outputs found
Selection for ovulation rate in rabbits: Direct and correlated responses estimated with a cryopreserved control population1
The aim of this work was to evaluate the
response in 10 generations of selection for ovulation
rate in rabbits using a cryopreserved control population.
Selection was based on the phenotypic value of ovulation
rate estimated at d 12 of second gestation by laparoscopy.
To produce the control population, embryos
from 50 donor females and 18 males, belonging to the
base generation of the line selected for ovulation rate,
were recovered. A total of 467 embryos (72-h embryos)
were vitrifi ed and stored in liquid N2 for 10 generations.
The size of both populations was approximately 10
males and 50 females. The number of records used to
analyze the different traits ranged from 99 to 340. Data
were analyzed using Bayesian methodology. A difference
between the selected and the control populations
of 2.1 ova (highest posterior density interval (HPD95%)
[1.3, 2.9]) was observed in ovulation rate (OR), but it
was not accompanied by a correlated response in litter
size (LS; −0.3; HPD95% [−1.1, 0.5]). The number
of implanted embryos (IE) increased with selection in
1.0 embryo (HPD95% [−0.6, 2.0]), but this increase was
not relevant. Prenatal survival, embryonic survival, and
fetal survival (FS) were calculated as LS/OR, IE/OR,
and LS/IE, respectively. Prenatal survival was reduced
with selection (−0.12; HPD95% [−0.20, −0.04]), basically
because of a decrease in FS (−0.12; HPD95%
[−0.19, −0.06]). Embryonic survival could have slightly
decreased (−0.05; HPD95% [−0.12, 0.02]). In summary,
comparison with a control population showed that ovulation
rate in rabbits increased with selection without
any correlated response in litter size, basically because
of a decrease in fetal survival.This study was supported by the Comision Interministerial de Ciencia y Tecnologia CICYT-AGL2005-07624-C03-01 and by funds from the Generalitat Valenciana research program (Prometeo 2009/125). The authors are grateful to Wagdy Mekkawy for letting us use his programs.Laborda Vidal, P.; Santacreu Jerez, MA.; Blasco Mateu, A.; Mocé Cervera, ML. (2015). Selection for ovulation rate in rabbits: Direct and correlated responses estimated with a cryopreserved control population1. Journal of Animal Science. 90(10):3392-3397. https://doi.org/10.2527/jas.2011-4837S33923397901
Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at √ s = 8 TeV with the ATLAS detector
Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses 20.3 fb−1 of √ s = 8 TeV data collected in 2012 with the ATLAS detector at the LHC. Events are required to have at least one jet with pT > 120 GeV and no leptons. Nine signal regions are considered with increasing missing transverse momentum requirements between Emiss T > 150 GeV and Emiss T > 700 GeV. Good agreement is observed between the number of events in data and Standard Model expectations. The results are translated into exclusion limits on models with either large extra spatial dimensions, pair production of weakly interacting dark matter candidates, or production of very light gravitinos in a gauge-mediated supersymmetric model. In addition, limits on the production of an invisibly decaying Higgs-like boson leading to similar topologies in the final state are presente
Impacts of the 2004 tsunami on groundwater resources in Sri Lanka, Water Resour
[1] The 26 December 2004 tsunami caused widespread destruction and contamination of coastal aquifers across southern Asia. Seawater filled domestic open dug wells and also entered the aquifers via direct infiltration during the first flooding waves and later as ponded seawater infiltrated through the permeable sands that are typical of coastal aquifers. In Sri Lanka alone, it is estimated that over 40,000 drinking water wells were either destroyed or contaminated. From February through September 2005, a team of United States, Sri Lankan, and Danish water resource scientists and engineers surveyed the coastal groundwater resources of Sri Lanka to develop an understanding of the impacts of the tsunami and to provide recommendations for the future of coastal water resources in south Asia. In the tsunami-affected areas, seawater was found to have infiltrated and mixed with fresh groundwater lenses as indicated by the elevated groundwater salinity levels. Seawater infiltrated through the shallow vadose zone as well as entered aquifers directly through flooded open wells. Our preliminary transport analysis demonstrates that the intruded seawater has vertically mixed in the aquifers because of both forced and free convection. Widespread pumping of wells to remove seawater was effective in some areas, but overpumping has led to upconing of the saltwater interface and rising salinity. We estimate that groundwater recharge from several monsoon seasons will reduce salinity of many sandy Sri Lankan coastal aquifers. However, the continued sustainability of these small and fragile aquifers for potable water will be difficult because of the rapid growth of human activities that results in more intensive groundwater pumping and increased pollution. Long-term sustainability of coastal aquifers is also impacted by the decrease in sand replenishment of the beaches due to sand mining and erosion
Adaptive Radiation in Mediterranean Cistus (Cistaceae)
lineage consists of
12 species primarily distributed in Mediterranean habitats and
is herein subject to analysis. lineages), which display asymmetric
characteristics: number of species (2 vs. 10), leaf morphologies
(linear vs. linear to ovate), floral characteristics (small,
three-sepalled vs. small to large, three- or five-sepalled
flowers) and ecological attributes (low-land vs. low-land to
mountain environments). A positive phenotype-environment
correlation has been detected by historical reconstructions of
morphological traits (leaf shape, leaf labdanum content and leaf
pubescence). Ecological evidence indicates that modifications of
leaf shape and size, coupled with differences in labdanum
secretion and pubescence density, appear to be related to
success of new species in different Mediterranean habitats.
Investigating the Influence of the Initial Biomass Distribution and Injection Strategies on Biofilm-Mediated Calcite Precipitation in Porous Media
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