Induction of parturition with aglepristone in the Majorera goat     

Batista M  Reyes R  Santana M  Alamo D  Vilar J  González F  Cabrera F  Gracia A 《Reproduction in domestic animals》2011,46(5):882-888

This study assessed the efficacy of aglepristone at inducing parturition in pregnant goats. Six experimental groups were defined: group A-5 (n = 12), group A-3.3 (n = 12), group A-2.5 (n = 12) and group A-1.5 (n = 12) in which goats were injected SC once with 5.0, 3.3, 2.5 and 1.5 mg of aglepristone per kg body weight of goat, respectively, group L (n = 11), which was treated IM with 3.75 mg of luprostiol; and group Ct (n = 11), which was injected SC with 1 ml of saline solution. Different parameters associated with parturition were thereafter investigated. In addition, plasma progesterone concentrations were defined after treatments till parturition. Aglepristone effectively induced parturition in all of the goats. In the A-5, A-3.3 and A-2.5 groups, the time to parturition was around 30-34 h, and the majority of goats (97.2%, 35/36) started kidding between 25 and 40 h after the aglepristone injection. However, the goats in group A-1.5 showed a significantly (p < 0.01) higher time to parturition (mean: 46.8 h). Overall, the incidence of dystocia registered in aglepristone-induced goats (20.8%, 10/48) and luprostiol-induced goats was not different from that observed after a spontaneous parturition. The percentage of live kids was very similar between A-5, A-3.3, A.2.5 and L groups (95.7, 95.3, 95.0 and 96.3%, respectively) but was higher that observed in the control (83.4%) and A-1.5 (81.2%) groups. In addition, no maternal mortality was registered in any groups. No changes in plasma progesterone were observed during the first 24 h after treatment, and high plasma progesterone concentrations were present at kidding (6.7, 5.5, 4.5 and 3.6 ng/ml for groups A-5, A-3.3, A-2.5 and A-1.5, respectively), confirming that aglepristone does not induce parturition via luteolysis. This study demonstrates that aglepristone can be used to induce parturition in goats with satisfactory efficacy, inducing pregnancy termination without direct or immediate modifications of luteal function.  相似文献   

Resistance of Fasciola hepatica against triclabendazole in cattle in Patagonia (Argentina)     

Olaechea F  Lovera V  Larroza M  Raffo F  Cabrera R 《Veterinary parasitology》2011,178(3-4):364-366

In the winter of 2008, cattle on a farm in the province of Neuquen, Argentina died from subacute and chronic liver fluke disease despite four previous treatments with Triclabendazole (TCBZ). In the spring of 2009, a preliminary efficacy test revealed good performance using nitroxynil, whereas TCBZ efficacy was only 18% by egg counts of Fasciola eggs in the faeces. Resistance to Fasciola hepatica to TCBZ has never been reported in South America, so in January of 2010 a controlled trial was conducted to confirm and to define the degree of resistance in this herd. In a clinical trial, the fluke egg output was monitored on Days 14 and 21 and serum enzymes gamma-glutamyl transpeptidase (GGT) and glutamic-oxaloacetic transaminase (GOT) on Days 0 and 21 in 36 calves treated with TCBZ or with closantel. The results showed a reduction of 100% in fluke egg output at Days 14 and 21 for closantel. The mean epg in the TCBZ-treated groups did not decrease. Because of the fact that in this study TCBZ treatment in cattle had no effect, even at double the recommended dose, it is highly indicative that resistance of F. hepatica against TCBZ is present on this farm. The GGT and GOT levels decreased in the closantel-treated group as a result of the treatment at 21 days after dosing. To evaluate the importance of TCBZ resistance in F. hepatica in Argentina, a study on more farms from endemic areas is needed.  相似文献   

Gender, rural households, and biodiversity in native Mexico     

Isidro Rimarachín Cabrera  Emma Zapata Martelo  Verónica Vázquez García 《Agriculture and Human Values》2001,18(1):85-93

Knowledge about maize varieties is the key to rural households' survival in native Mexico. Native peoples relate to nature in particular ways and they play a crucial role in maintaining biodiversity. This paper discusses the relationship between native women's accumulated knowledge on maize varieties and the laboratory analysis of the species that they manage. Fieldwork was conducted in an Otomí community, San Pablo Arriba, located in the state of Mexico. This revised version was published online in June 2006 with corrections to the Cover Date.  相似文献   

High fry production rates using post-thaw silver carp (Hypophthalmichthys molitrix) spermatozoa under farming conditions     

Brbaro Alvarez  Roberto Fuentes  Rafael Pimentel  Zoila Abad  Edenaida Cabrera  Eulogio Pimentel  Amilcar Arenal 《Aquaculture (Amsterdam, Netherlands)》2003,220(1-4):195-201

Silver carp (Hypophthalmichthys molitrix) is not endemic to Cuba, and egg fertilization is totally artificial; males produce spermatozoa only between March and October. Cryopreservation of silver carp spermatozoa would reduce the number of males needed, minimize handling stress through less frequent stripping, and facilitate artificial propagation when eggs are available. The effects on motility and fry production from eggs fertilized with thawed sperm under farm-conditions were examined in this study. Five, seven and ten percent of dimethyl sulfoxide (DMSO), glycerol and methanol were tested as cryoprotectants. DMSO was a more suitable cryoprotectant than methanol or glycerol. The effect of equilibration time on the motility rate at 10% DMSO was evaluated. Hatching rates equal to the control (P>0.01) were obtained under farm conditions with frozen spermatozoa, stored even for a year in liquid nitrogen, with a final DMSO concentration of 10%. Cryopreservation offers a useful routine method for sperm storage and silver carp handling. To our knowledge, this is the first report on the production of fry from post-thaw silver carp spermatozoa under farming conditions.  相似文献   

Fertilizer placement to maximize nitrogen use by fescue     

Charles W. Raczkowski  David E. Kissel  Merle F. Vigil  Miguel L. Cabrera 《Journal of plant nutrition》2016,39(4):581-587

The method of fertilizer nitrogen (N) application can affect N uptake in tall fescue and therefore its yield and quality. Subsurface-banding (knife) of fertilizer maximizes fescue N uptake in the poorly-drained clay-pan soils of southeastern Kansas. This study was conducted to determine if knifed N results in greater N uptake than the conventional top-dress application method in a deep, well-drained soil of east-central Kansas. The experiment, conducted in a Smolan silty clay loam soil, was a split-plot with fertilizer nitrogen rates 0, 140 and 280 kg N ha^?1 applied as urea-ammonium nitrate (UAN, 28% N), knifed or top-dressed. Soil inorganic N [ammonium (NH₄)- and nitrate (NO₃–N)] and N in roots and plant tops were measured at various times during the growing season. At final harvest, most of the knifed N (99.7%) was accounted for in plant tissue (roots and tops) and soil, with more than half of the knifed N remaining as soil inorganic N. With the top-dressed method, 27% was unaccounted for and presumed lost in gaseous form. Knifing fertilizer N in fescue fields of east-central Kansas will maximize the availability of N, reduce potential N losses, and increase forage quality.  相似文献   

Erratum to: A segregation distortion locus located on linkage group 4 of the chickpea genetic map     

P. Castro  J. Rubio  A. Cabrera  T. Millán  J. Gil 《Euphytica》2011,179(3):525-525

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Energy audit of irrigation networks     

Miguel A. Pardo  Juan Manzano  Enrique Cabrera  Jorge García-Serra 《Biosystems Engineering》2013,115(1):89-101

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Administration of meloxicam to improve the welfare of mice in research: a systematic review (2000 – 2020)     

Antiorio  Ana Tada Fonseca Brasil  Alemán-Laporte  Jilma  de Freitas  Ana Paula Pauloni  Yamamoto  Pedro Kenzo  Cintra  Luciana  Mori  Claudia Madalena Cabrera 《Veterinary research communications》2022,46(1):1-8

Veterinary Research Communications - Although laboratory animals experience pain as a necessary component of the objectives of experimental protocols, the level of pain should be minimized through...  相似文献   

Soil enzymatic response to addition of heavy metals with organic residues   总被引：14，自引：0，他引：14  

Engracia Madejón  Pilar Burgos  Rafael López  Francisco Cabrera 《Biology and Fertility of Soils》2001,34(3):144-150

Changes in organic C, available P, available heavy metal contents and enzymatic activities induced by addition of two heavy metal rich organic residues [a municipal solid waste compost (MWC) and a non-composted paper sludge (PS)] were determined in two different soils during a 280-day incubation experiment. The addition of the organic materials caused a rapid and significant increase in the organic C and enzymatic activities in both soils, this increase was specially noticeable in soils treated with MWC. In general, enzymatic activities in amended soils tended to decrease with the time. Organic materials also increased heavy metal contents in soil. However, the presence of available soil heavy metals due to the addition of the organic materials at doses of 50,000 kg ha^-1 did not negatively affect dehydrogenase, #-glucosidase or urease activities in the soils. There were significant and negative correlations between heavy metals and phosphatase activity in the soils at the beginning of the incubation. This negative correlation was probably due to the decrease in the enzyme activity in soils treated with PS in which high levels of available P were also found. It is difficult, therefore, to attribute an inhibition of the enzyme activity to the presence of these heavy metals because a high available P concentration in soils also depresses phosphatase activity.  相似文献   

Desorption of phosphate from iron oxides in relation to equilibrium pH and porosity     

F. Cabrera  P. de Arambarri  L. Madrid  C.G. Toga 《Geoderma》1981,26(3):203-216

Reactions of phosphated lepidocrocites and geothites with 0.1 M NaCl, 0.1 M NaOH and 0.5 M NH₄F solutions have been studied. Solutions of indifferent electrolyte (0.1 M NaCl) at the same pH as used during adsorption of P were used to desorb P so that new apparent equilibria were reached, but a slow readsorption was also observed. Strongly alkaline solutions seemed to cause some breakdown of the solid surface and part of the adsorbed P became occluded.Desorption and isotopic exchange data have been related to porosity of the two oxides, and presence of a component of the exchangeable P released very slowly, has been attributed to P adsorbed on surfaces of micropores.  相似文献