Comparison of Different Treatments for Oestrous Induction in Seasonally Anovulatory Mares     

G Vizuete  E Diez  J Galisteo  E Agüera  E Aguilera‐Tejero  CC Perez‐Marín 《Reproduction in domestic animals》2013,48(3):463-469

The aim of this study was to evaluate the effects of different treatments for induction and synchronization of oestrus and ovulation in seasonally anovulatory mares. Fifteen mares formed the control group (C), while 26 mares were randomly assigned to three treatment groups. Group T1 (n = 11) were treated with oral altrenogest (0.044 mg/kg; Regumate^®) during 11 days. Group T2 (n = 7) was intravaginally treated with 1.38 g of progesterone (CIDR^®) for 11 days. In group T3 (n = 8), mares were also treated with CIDR^®, but only for 8 days. All mares received PGF2α 1 day after finishing the treatment. Sonographic evaluation of follicles, pre‐ovulatory follicle size and ovulation time was recorded. Progesterone and leptin levels were analysed. Results show that pre‐ovulatory follicles were developed after the treatment in 88.5% of mares. However, the pre‐ovulatory follicle growth was dispersal, and sometimes it was detected when treatment was not finished. While in mares treated with intravaginal device, the follicle was soon detected (1.5 ± 1.2 days and 2.3 ± 2.0 days in T2 and T3 groups, respectively), in T1 group, the pre‐ovulatory follicle was detected slightly later (3.9 ± 1.6 days). The interval from the end of treatment to ovulation did not show significant differences between groups (T1 = 13.1 ± 2.5 days; T2 = 11.0 ± 3.6 days; T3 = 13.8 ± 4.3 days). The pregnancy rate was 47.4%, similar to the rate observed in group C (46.7%; p > 0.05). Initial leptin concentrations were significantly higher in mares, which restart their ovarian activity after treatments, suggesting a role in the reproduction mechanisms in mares. It could be concluded that the used treatments may be effective for oestrous induction in mares during the late phase of the seasonally anovulatory period. Furthermore, they cannot synchronize oestrus, and then, it is necessary to know the reproductive status of mares when these treatments are used for oestrous synchronization.  相似文献   

Differential response of male and female Diabrotica speciosa (Coleoptera: Chrysomelidae) to bitter cucurbit-based toxic baits in relation to the treated area size     

G. Cabrera Walsh  Federico Mattioli  Donald C. Weber 《国际虫害防治杂志》2014,60(2):128-135

Cucurbitacin-rich extracts are phagostimulants for both male and female Luperini, but field trials reveal that males are far more attracted to them than females. The sex ratio and number of beetles killed by an application of cucurbitacin-based toxic baits was assessed at two different scales: small areas of 100 m², and a larger area of 10,000 m². The small area bait applications killed mostly males (95.2%), but the 1-ha treated plot showed a lower sexual bias (57% male). An earlier study indicated point sources (sticky traps) attracted only males. Results indicate that the distance attraction to bitter cucurbit extracts is almost exclusive to males, but the wide dispersal of a toxic bait based on them should promote encounter and control of both sexes within the treated area. No significant non-target effects were observed.  相似文献   

A wind-oriented sticky trap for evaluating the behavioural response of the leaf-beetle Diabrotica speciosa to cucurbit extracts     

G. Cabrera Walsh  Federico Mattioli  Donald C. Weber 《国际虫害防治杂志》2014,60(1):46-51

Cucurbitacins are plant defensive chemicals that attract many species of adapted insect herbivores such as luperine leaf beetles, and they have been employed in traps and toxic baits. Male and female beetles feed avidly on baits containing these compounds, but field trials have revealed that males find them far more attractive than females. A wind-oriented baited sticky trap was designed to evaluate the response of Diabrotica speciosa to cucurbit extracts, by means of a mark–release–recapture experiment. The spatial range of attraction was less than 20 m, and captures were almost exclusively of males (99.91%). Distance attraction for D. speciosa to a point-source of bitter cucurbit juices is probably exclusive to males. These conclusions probably apply to most Diabrotica species, of which many are crop pests.  相似文献   

野性斯派塞     

CC 《百姓》2011,(10)

苍绿的草原一望无际,起伏的山丘上搭着一道道浓绿的葡萄架,远处成群的牛羊悠闲地吃着草,星星点点的白色房屋,好似一幅静美的天然油画,而澳大利亚五星级牧场斯派塞就坐落于这绿色深处。  相似文献   

Sum rules and interlayer conductivity of high-Tc cuprates     

DN Basov  SI Woods  AS Katz  EJ Singley  RC Dynes  M Xu  DG Hinks  CC Homes  M Strongin 《Science (New York, N.Y.)》1999,283(5398):49-52

Analysis of the interlayer infrared conductivity of cuprate high-transition temperature superconductors reveals an anomalously large energy scale extending up to midinfrared frequencies that can be attributed to formation of the superconducting condensate. This unusual effect is observed in a va- riety of materials, including Tl2Ba2CuO6+x, La2-xSrxCuO4, and YBa2Cu3O6.6, which show an incoherent interlayer response in the normal state. Midinfrared range condensation was examined in the context of sum rules that can be formulated for the complex conductivity. One possible interpretation of these experiments is in terms of a kinetic energy change associated with the superconducting transition.  相似文献   

Susceptibility of N'Dama cattle to experimental challenge and cross-species superchallenges with bloodstream forms of Trypanosoma congolense and T. vivax.     

R C Mattioli  J A Faye  P Büscher 《Veterinary parasitology》1999,86(2):83-94

Susceptibility to Trypanosoma congolense, T. vivax challenge and cross species-superchallenges, and related effects on health and productivity were assessed in N'Dama cattle. Twenty-five N'Dama bulls aged 3-4 years and previously primed with trypanosome infections through natural tsetse exposure over more than one year were used. The experimental herd was divided in five groups each composed of five randomly selected animals. Group 1 was challenged with T. congolense, Group 2 with T. vivax, Group 3 was inoculated with T. congolense followed by a cross-superchallenge with T. vivax, Group 4 was inoculated with T. vivax followed by T. congolense cross-superchallenge. Animals in Group 5 were used as controls. Both T. vivax and T. congolense cross-superchallenges were carried out on Day 14 subsequent to respective initial T. congolense and T. vivax inoculations. All challenges were performed by intradermal needle inoculation of stocks of trypanosome bloodstream forms. In challenged animals (Group 1 to 4), parasitaemia profiles and packed red cell volumes (PCV) were measured for four months. Weight changes were recorded monthly and daily weight gain (DWG) computed. All cattle challenged with T. congolense became parasitaemic. Conversely, one animal in Group 2 and two in Group 3 never displayed patent T. vivax parasitaemia. Both in single (Group 1), initial (Group 3) and cross-superchallenged (Group 4) cattle higher percentage of positive blood samples and higher parasitaemia level were obtained following T. congolense than T. vivax inocula (Group 2, 3 and 4) (P<0.04 or greater). Overall the pre-challenge period, PCV values and DWGs were nearly identical in the five groups. Conversely, over the post-challenge period, cattle singly, initially and cross-superinoculated with T. congolense (Group 1, 3 and 4) displayed lower PCV values and DWGs in comparison with both control animals (Group 5) and with singly T. vivax challenged cattle (Group 2) (P<0.05 or greater). No difference in mean PCV levels and DWGs was found between animals in Group 2 and cattle in Group 5. It was concluded that trypanotolerant N'Dama cattle suffered more from T. congolense and mixed T. congolensel T. vivax infections, while pure T. vivax infection did not produce appreciable negative effects on their health and productivity. Therefore, considering that tsetse and trypanosomosis control campaigns are costly and are justified only when derived economic benefits exceed those of control, and also that an ample mosaic of farming systems exists in West Africa, species-specific trypanosome prevalence and relative impact should be assessed in various cattle populations and breeds differing in trypanosome susceptibility before advising any intervention. Moreover, virulence and related effects of T. congolense and T. vivax endemic stocks on health and productivity in local cattle populations should also be estimated in order to counsel appropriate economic protection measures against trypanosmosis, i.e. vector control and/or strategic use of trypanocidal drugs.  相似文献   

Recent Acquisitions in Pig Oocyte Maturation and Fertilization In Vitro     

M. Mattioli 《Reproduction in domestic animals》1994,29(4):346-348

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Susceptibility to different tick genera in Gambian N'Dama and Gobra zebu cattle exposed to naturally occurring tick infestations     

R. C. Mattioli  M. Bah  S. Kora  M. Cassama  D. J. Clifford 《Tropical animal health and production》1995,27(2):95-105

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Liveweight and killing out percentage of some wild animal species of the Nazinga game ranch (Burkina Faso) infested by tsetse flies     

Mattioli  R.C.  Belem  A.M.G.  Ki-Zerbo  A.  Thiry  E.E. 《Tropical animal health and production》1998,30(2):137-140

Tropical Animal Health and Production -  相似文献   

Short‐term tolerance of equine spermatozoa to various abiotic factors          下载免费PDF全文

CC Pérez‐Marín  FD Requena  A Arando  L Requena  F Requena  EI Agüera 《Reproduction in domestic animals》2018,53(2):534-544

The aim of this study was to determine the effects of various abiotic factors, such as light, physical stress (pipetting) and thermal shock, on the quality of fresh and cooled equine sperm. In experiment I, four sperm aliquots were subjected to different light exposures: (i) protected control samples (CTRL), (ii) exposed to UV light at 10 cm (UV10), (iii) exposed to UV light at 20 cm (UV20) and (iv) exposed to laboratory lighting (LAB). In experiment II, four semen aliquots were subjected to repeated pipetting for 0, 10, 20 and 30 times (CTRL, P10, P20 and P30, respectively). In experiment III, four semen aliquots at 15°C were subjected to thermal oscillations: (i) cooled control sperm at 15°C (CTRL), (ii) oscillations of 1.9°C/min to a temperature of 30°C (T30), (iii) oscillations of 1.4°C/min, with the temperature rapidly falling until reaching 1.3°C (T0R) and (iv) oscillations of 1.1°C/min, with the temperature slowly falling until reaching 4.2°C (T0S). The results revealed that after 30 min, UV10 and UV20 sperm samples showed significantly (p < .05) lower total and progressive motility values, sperm kinematic parameters and mitochondrial potential. After 45 min of exposure, differences were highly significant (p < .001). No significant differences (p > .05) were found for pipetting or thermal oscillations. The results suggest that, even if equine sperm samples are not handled in the laboratory under optimal conditions, fresh and cooled equine spermatozoa are able to resist the impact of various abiotic stimuli without any reduction in their quality. This study analyses the effect on normospermic samples, but future research could look at the tolerance that asthenozoospermic equine samples have to these abiotic influences.  相似文献