Observations on the faecal egg count of calves naturally infected with Ostertagia ostertagi

The faecal egg counts of seven groups of calves exposed to infection with O. ostertagi on pastures were found to follow a similar course to those of calves experimentally infected on one occasion or of calves infected daily. They declined from an early peak according to an apparently logarithmic curve. It was concluded that faecal egg counts were largely independent of worm numbers and tended to follow a stereotyped pattern. Acute clinical ostertagiasis was as liable to lead to high egg counts as was poor thriving due to the other causes. The relevance of these findings to the epidemiology of ostertagiasis and to the use of faecal egg counts in the diagnosis of parasitic gastro-enteritis are discussed.The author thanks Miss C. N. Herbert for the calculations and curve fitting in this paper.

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Some observations on the worm burdens of calves infected daily with Ostertagia ostertagi

Parasitology ◽

10.1017/s0031182000031127 ◽

1969 ◽

Vol 59 (3) ◽

pp. 575-595 ◽

Cited By ~ 92

Author(s):

J. F. Michel

Keyword(s):

Adverse Effect ◽

Infection Rate ◽

Critical Value ◽

Egg Laying ◽

Entire Population ◽

Positive Relation ◽

Ostertagia Ostertagi ◽

Infective Larvae ◽

Logarithmic Curve ◽

Faecal Egg Counts

Two experiments are described in each of which three groups of calves received infective larvae of Ostertagia ostertagi daily, each group at a different rate. Changes in worm burdens were followed by the periodic slaughter of calves.Numbers of adult worms quickly rose to and remained at levels which bore a positive relation to the infection rate. There was evidence that a turnover of worms was occurring and it appeared that burdens of adult worms were regulated by a loss of worms which depended on the number present. As the host's experience of infection increased, the adult worms present were smaller and an increasing proportion of females lacked a fully developed vulval flap. Evidence is presented which suggests that these were effects of resistance and that they depended on separate mechanisms.Faecal egg counts of groups carrying different numbers of worms rose to the same peak and then declined according to the same logarithmic curve. This finding, together with data concerning the number of eggs in the uteri of the worms, suggested that the egg output of the entire population was restricted by the host to a limit which depended on previous egg-laying.Infection did not have an adverse effect on the growth of the calves unless the infection rate exceeded a critical value. The resistance of calves to infection was impaired by clinical ostertagiasis.

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The influence of dietary carbohydrates on experimental infection withTrichuris suisin pigs

Parasitology ◽

10.1017/s0031182005008620 ◽

2005 ◽

Vol 132 (6) ◽

pp. 857-865 ◽

Cited By ~ 22

Author(s):

L. E. THOMSEN ◽

S. PETKEVIČIUS ◽

K. E. BACH KNUDSEN ◽

A. ROEPSTORFF

Keyword(s):

Sugar Beet ◽

Experimental Infection ◽

Diet Group ◽

The Other ◽

Post Inoculation ◽

Dietary Carbohydrates ◽

Barley Flour ◽

Faecal Egg Counts ◽

The Difference ◽

Fermentable Carbohydrates

Two experiments (Exps 1 and 2) were carried out to study the effect of dietary carbohydrates on the establishment ofTrichuris suisin pigs. Two experimental diets based on barley flour were used; Diet 1 was supplemented with non-fermentable carbohydrates from oat hull meal, while Diet 2 was supplemented with fermentable carbohydrates from sugar beet fibre and inulin. In Exp. 1, thirty-two pigs were allocated randomly into 4 groups. Two groups were fed Diet 1 and 2 groups were fed Diet 2. Pigs from one of each diet group were inoculated with 2000 infectiveT. suiseggs each and the other two groups were uninfected controls. All pigs were slaughtered 8 weeks post-inoculation (p.i.). In Exp. 2, twenty-four pigs were allocated randomly into 2 groups and fed Diet 1 or Diet 2, respectively. All the pigs were inoculated with 2000 infectiveT. suiseggs. Six pigs from each group were slaughtered 8 weeks p.i. and the remaining 6 pigs from each group were slaughtered 12 weeks p.i. Infections were followed by faecal egg counts and worm burdens were assessed at necropsy. Pigs fed Diet 2 had lower egg counts in both experiments; in Exp. 2 the difference was significant (P<0·05). No differences were found in worm burdens 8 weeks p.i. in both experiments, however, worms from pigs on Diet 2 were significantly shorter (P<0·0001). Pigs fed Diet 2 and slaughtered 12 weeks p.i. had significantly lower worm counts (P<0·01) compared to pigs fed Diet 1. The results indicate that fermentable carbohydrates do not affect the establishment ofT. suisin naïve pigs, but result in earlier expulsion and reduced growth of the established worms. Thus, diets with highly fermentable carbohydrates may be used in the control ofT. suis.

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Super-resolution image by curve fitting in the threshold decomposition domain

APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems ◽

10.1109/apccas.2008.4746027 ◽

2008 ◽

Author(s):

Tsz-Chun Ho ◽

Bing Zeng

Keyword(s):

Curve Fitting ◽

Super Resolution ◽

Resolution Image ◽

Fitting In

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Faster solution of nonlinear equations using logical effort method and curve fitting in low power design

IEICE Electronics Express ◽

10.1587/elex.6.889 ◽

2009 ◽

Vol 6 (13) ◽

pp. 889-896 ◽

Cited By ~ 1

Author(s):

Mohsen Radfar ◽

Saadat Pourmozaffari

Keyword(s):

Low Power ◽

Nonlinear Equations ◽

Curve Fitting ◽

Low Power Design ◽

Fitting In

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Effect of curve fitting in an automated cardiac arrhythmia detection system

2021 6th International Conference on Communication and Electronics Systems (ICCES) ◽

10.1109/icces51350.2021.9488981 ◽

2021 ◽

Author(s):

K Vasanth ◽

Divya. M ◽

Kameswari D.V. N ◽

Celin S

Keyword(s):

Cardiac Arrhythmia ◽

Curve Fitting ◽

Detection System ◽

Arrhythmia Detection ◽

Fitting In

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Hyperspectral Data Compression by Using Rational Function Curve Fitting in Spectral Signature Subintervals

2018 11th International Symposium on Communication Systems, Networks & Digital Signal Processing (CSNDSP) ◽

10.1109/csndsp.2018.8471809 ◽

2018 ◽

Cited By ~ 1

Author(s):

Mersedeh Beitollahi ◽

S. Abolfazl Hosseini

Keyword(s):

Data Compression ◽

Rational Function ◽

Curve Fitting ◽

Hyperspectral Data ◽

Spectral Signature ◽

Fitting In

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Motion of Multiple Robot in a Curved Boundary & Obstacles

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.a1834.109119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 6011-6014

Keyword(s):

Curve Fitting ◽

The Other ◽

Multiple Robots ◽

Curved Boundary ◽

Medical Supplies ◽

Straight Line ◽

Multiple Robot ◽

Assembly Operations ◽

Curve Equation ◽

Made In

An attempt is made in this paper to gain the flexibility of movement of robots around the boundary of the workspace, where in many robots are moving at a time in the presence of the static curved obstacles. The boundary of the workspace may be a straight line or curve shaped. The obstacle may be polygonal or curved shaped. A program is developed for the motion of the multiple robots to move from its origin location to the desired location without colliding with the boundary, the other moving robots and the static obstacles. The program is based on the curve fitting technique. As and when the robot comes close to the curved boundary or curved barrier, it will trace the path formed by the curve equation using the technique of curve fitting. Since there are multiple robots, the path planning ensures the robots to reach their targets in minimum time. During tracing the path, if more than one robot is following the same path, priority is assigned to such robots. Multiple robots finds application in assembly operations, medical supplies and meals to patients, disinfecting the rooms for patients etc.

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