scholarly journals PROGESTAMAG® – AN EFFECTIVE REMEDY FOR INCREASE OF REPRODUCTIVE INDICATORS IN SWINE-BREEDING

PIG-BREEDING ◽  
2021 ◽  
pp. 43-45
Author(s):  
A.V. FILATOV ◽  
◽  
V.S. LOBANOV ◽  
V.P. KHLOPITSKY ◽  
◽  
...  
Keyword(s):  
Critical Period ◽  
Experimental Studies ◽  
Optimal Frequency ◽  
Early Gestation ◽  
Breeding Stock ◽  
Exogenous Progesterone ◽  
Effective Remedy

The optimal frequency of administration and terms use of preparation Progestamag® for increased level of reproduction in sows are defined. The efficiency this hormonal progesterone-containing preparation in the critical period pregnancy of animals is revealed. Experimental studies have shown that injection of exogenous progesterone during early gestation contributes increase level of fertilization and multiple fetation of breeding stock pigs.

Theoretical and experimental studies of impact energy and rock-drilling efficiency in vibro-impact drilling

2021 ◽  
pp. 1-17
Author(s):  
Quan Cao ◽  
Huaizhong Shi ◽  
Weiqiang Xu ◽  
Chao Xiong ◽  
Zhaoliang Yang ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
Impact Energy ◽  
Penetration Rate ◽  
Experimental Studies ◽  
Impact Frequency ◽  
Optimal Frequency ◽  
Rock Drilling ◽  
Loading Waveform ◽  
Impact Parameters ◽  
The Impact

Abstract Vibro-impact drilling has been proven to be a viable technique for enhancing the Rate of Penetration (ROP) in deep and ultra-deep well drilling. It is essential to study the effects of impact parameters on impact energy and rock-drilling efficiency for impact tool design and operating parameter optimization. In this paper, the influences of impact parameters including impact frequency, dynamic loading amplitude and loading on impact energy were analyzed by theoretical method. Then a full-scale drilling experiment was conducted to study the rock-drilling efficiency. The results are as follows: the optimal frequency is higher than the resonance frequency of the rock. The impact energy increase with the dynamic loading amplitude. The penetration rate at dynamic loading amplitude of 4 KN (0.13137 mm/s) is 38.7% higher than that of 2 KN (0.09473mm/s). When the impact frequency is lower than150 Hz, the rock-drilling efficiency increases with the impact frequency and dynamic loading amplitude. The penetration rate is 0.1051 mm/s at impact frequency of 150 Hz, which is 29.8% higher than that of 10 Hz. The impact energy and penetration rate at square loading waveform are the largest. The impact energy per second at loading waveform of square, sine and triangular is 19.6 J, 12 J and 7.91 J respectively when the impact frequency is set to optimal frequency of impact energy. This study provides a theoretical guidance for the optimization design of vibro-impact drilling technology.

A note on the effects of exogenous progesterone and oestrone during early gestation on farrowing performance in gilts

1983 ◽  
Vol 37 (1) ◽  
pp. 141-144 ◽  
Author(s):  
J. W. Knight ◽  
D. L. Dalton ◽  
K. L. Bryant
Keyword(s):  
Live Weight ◽  
Early Gestation ◽  
Exogenous Progesterone

ABSTRACTAdministration of exogenous progesterone (0-55 mg/kg live weight) and oestrone (0-275μg/kg live weight) during various discrete intervals between days 4 and 30 of gestation elicited variable results depending upon the time and duration of administration. Administration of the combined steroids early in gestation (days 4 to 20, trial 1; days 4 to 12, trial 2) tended to affect farrowing performance adversely. In general, advantageous effects on farrowing performance occurred when treatment with exogenous progesterone and oestrone was initiated at day 12 or later of gestation.

Contribution of exogenous progesterone to human adrenal cortisol synthesis in vitro: A comparison of early gestation fetal and adult tissues

Steroids ◽  
1986 ◽  
Vol 47 (4-5) ◽  
pp. 269-285 ◽  
Author(s):  
Charlotte L Branchaud ◽  
Lisa Lipowski ◽  
Bilkis Dhanani ◽  
Cynthia G Goodyer ◽  
Yves Lefebvre
Keyword(s):  
Early Gestation ◽  
Adult Tissues ◽  
Exogenous Progesterone

scholarly journals Customers’ reactions to different organizational tactics in a service termination context

2019 ◽  
Vol 54 (1) ◽  
pp. 26-48 ◽  
Author(s):  
Amin Nazifi ◽  
Dahlia El-Manstrly ◽  
Katja Gelbrich
Keyword(s):  
Experimental Studies ◽  
Corporate Image ◽  
Negative Consequences ◽  
Negative Customers ◽  
Content Type ◽  
Mediating Role ◽  
Monetary Compensation ◽  
Effective Remedy ◽  
Moderating Role

Purpose This study aims to examine the effects of organizational tactics (e.g. explanation and monetary compensation) on customers’ reactions to service termination. The mediating role of anger and the moderating role of termination strategy on the effectiveness of organizational tactics are examined to enhance the understanding of customers’ reactions to service termination. Design/methodology/approach Three experimental studies are conducted with different contexts (telecom and banking) and samples (students and consumers). Findings Study 1 results show that explanation and high monetary compensation reduce negative word-of-mouth and enhance corporate image and anger mediates these effects. Study 2a results show that high monetary compensation becomes ineffective when firms use a soft termination approach. Study 2b results show that an explanation is equally effective in soft and hard termination approaches. Importantly, unlike high monetary compensation, the explanation can fully eliminate the negative consequences of service termination. Practical implications Managers can mitigate negative customers’ reactions to service termination by offering a truthful explanation. Further, they should provide high monetary compensation only if they do not help dismissed customers find an alternative provider. Originality/value This paper contributes to the service termination literature by shedding more light on the effectiveness of different organizational tactics following different termination strategies. The findings challenge existing wisdom on the overrated role of monetary compensation showing that in service termination, the explanation is the most effective remedy. Further, unlike justice, anger better explains customers’ reactions to service termination.

3-D reconstruction and analysis of mammalian mitotic spindle structure

1992 ◽  
Vol 50 (1) ◽  
pp. 578-579
Author(s):  
Kent McDonald ◽  
David Mastronarde ◽  
Rubai Ding ◽  
Eileen O'Toole ◽  
J. Richard McIntosh
Keyword(s):  
Cross Sections ◽  
Mitotic Spindle ◽  
Experimental Studies ◽  
Video Camera ◽  
Three Dimensions ◽  
Mitotic Spindles ◽  
Black And White ◽  
Reconstruction Methods ◽  
Spindle Structure ◽  
Tissue Culture Line

Mammalian spindles are generally large and may contain over a thousand microtubules (MTs). For this reason they are difficult to reconstruct in three dimensions and many researchers have chosen to study the smaller and simpler spindles of lower eukaryotes. Nevertheless, the mammalian spindle is used for many experimental studies and it would be useful to know its detailed structure.We have been using serial cross sections and computer reconstruction methods to analyze MT distributions in mitotic spindles of PtK cells, a mammalian tissue culture line. Images from EM negatives are digtized on a light box by a Dage MTI video camera containing a black and white Saticon tube. The signal is digitized by a Parallax 1280 graphics device in a MicroVax III computer. Microtubules are digitized at a magnification such that each is 10-12 pixels in diameter.

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