APPEARANCE OF OESTRONE SULPHATE IN THE ALLANTOIC FLUID OF THE COW

1978 ◽  
Vol 79 (2) ◽  
pp. 243-244 ◽  
Author(s):  
H. A. ROBERTSON ◽  
G. J. KING ◽  
J. A. CARNEGIE
Keyword(s):  
Allantoic Fluid ◽  
Animal Research ◽  
Reproductive Physiology ◽  
Poultry Science ◽  
Peripheral Plasma ◽  
Early Stages ◽  
Oestrone Sulphate ◽  
Pregnant Ewe ◽  
Animal Research Institute ◽  
Research Institute

Reproductive Physiology Program, Animal Research Institute, Ottawa, Ontario, Canada, K1A 0C6 and * Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada, N1G 2W1 (Received 15 May 1978) The ability of the conceptus to synthesize oestrogens during the early stages of pregnancy has recently been receiving increasing attention. Among the domesticated species, the day 12 blastocyst of the pig has been shown to be capable of synthesizing oestrogens (Perry, Heap & Amoroso, 1973; Gadsby, Burton, Heap & Perry, 1976) and oestrone sulphate, synthesized as a product of conception, has been shown to be present in the peripheral plasma of the pregnant pig as early as day 17 (Robertson & King, 1974; Robertson, King & Dyck, 1978). In the pregnant ewe, oestrone sulphate has been shown to be the predominant oestrogen in allantoic fluid and to be present in measurable concentrations as early as day 30 (Carnegie & Robertson,

Babesia bigemina in ticks grown on non-bovine hosts and its transmission to these hosts

Parasitology ◽  
1965 ◽  
Vol 55 (2) ◽  
pp. 375-381 ◽  
Author(s):  
L. L. Callow
Keyword(s):  
Technical Assistance ◽  
Animal Research ◽  
Boophilus Microplus ◽  
Babesia Bigemina ◽  
Blood Smears ◽  
Animal Research Institute ◽  
Research Institute

The failure of Boophilus microplus to be cleansed of Babesia bigemina while the ticks were growing on non-bovine hosts, as well as the infection of the non-bovine hosts, was demonstrated in experiments in which infected ticks were released on a number of sheep, a goat and a horse.Seven of ten batches of ticks, collected from six non-bovine hosts, retained their babesia-infection.Blood subinoculated into cattle from seven of nine sheep and from the horse showed that these animals carried B. bigemina whilst the ticks were feeding on them. This suggested that ticks may have become reinfected from the non-bovine hosts, a possibility supported by the finding of B. bigemina in blood smears from two of the sheep.This work was performed at the Animal Research Institute, Yeerongpilly, and in the Department of Parasitology, University of Queensland, and supported by funds from both organizations. I am indebted to Mr G. D. Daly for technical assistance, to Professor J. F. A. Sprent and Dr H. M. D. Hoyte for their interest and help.

scholarly journals Factor Influencing the Resurgence of Brown Planthopper in Bangladesh

2020 ◽  
Vol 18 (1) ◽  
pp. 117-128
Author(s):  
ABMA Uddin ◽  
KS Islam ◽  
M Jahan ◽  
A Ara ◽  
MAI Khan
Keyword(s):  
Brown Planthopper ◽  
Lethal Dose ◽  
Reproductive Physiology ◽  
Recommended Dose ◽  
Insecticide Treatment ◽  
Lambda Cyhalothrin ◽  
Brown Plant Hopper ◽  
Research Institute

Possible causes of brown plant hopper resurgence were determined at the net-house of Entomology Division of Bangladesh Rice Research Institute (BRRI) during 2015. Causes of resurgence in the form of resurgence ratios were higher with acetamiprid, acephate, chlorpyrifos, cypermethrin, deltamethrin, fenvalerate, lambda cyhalothrin, thiamethoxam insecticides compared to imidacloprid, cartap, dinotefuran, isoprocarb /MIPC, phenthoate, pymetrozine when even applied at recommended dose. However, thiamethoxam, imidacloprid, isoprocarb / MIPC and cartap applied at sub-lethal dose produced higher resurgence ratio of BPH than others. Isoprocarb / MIPC, a commonly used recommended insecticide was found to have a higher resurgence ratio with the insecticide treatment at the egg stage (1.71) and combination of all stages (0.82). These insecticides influenced on the growth and reproductive physiology of rice brown planthopper and consequently resurgence ratio ranged increased. SAARC J. Agri., 18(1): 117-128 (2020)

Oestrogens in fetal and maternal fluids throughout pregnancy in the pig and comparisons with the ewe and cow

1985 ◽  
Vol 106 (3) ◽  
pp. 355-360 ◽  
Author(s):  
H. A. Robertson ◽  
R. J. Dwyer ◽  
G. J. King
Keyword(s):  
Early Pregnancy ◽  
Allantoic Fluid ◽  
Maternal Blood ◽  
Maternal Plasma ◽  
Maternal Urine ◽  
Oestrone Sulphate ◽  
Fetal Fluids

ABSTRACT In order to correlate the concentrations of oestrogens in the fetal fluids of the pig with those observed in the maternal blood and urine, changes in the concentrations of oestrone, oestradiol-17β, oestrone sulphate, oestradiol sulphates and oestrone glucuronide were assessed throughout pregnancy in the fetal and maternal fluids. In general, the pattern of change was similar for all oestrogens measured in both fetal and maternal fluids. Since the concentration of oestrogens in allantoic fluid during early pregnancy is reflected in the concentration of these steroids in maternal plasma and excreted in the maternal urine, the rise and fall of oestrogen concentrations around day 30 is suggestive of synthesis followed by a virtual cessation of oestrogen production until the fetus or placenta again produce increasing amounts detectable after day 45. These findings contrast sharply with those in the cow and the ewe where, although similar peaks in oestrogen concentrations are observable in allantoic fluid during early pregnancy, they are not reflected in blood. J. Endocr. (1985) 106, 355–360

HUMAN TESTIS DOES NOT SECRETE OESTRONE SULPHATE

1982 ◽  
Vol 92 (2) ◽  
pp. 185-194 ◽  
Author(s):  
F. C. W. WU ◽  
I. A. SWANSTON ◽  
T. B. HARGREAVE ◽  
D. T. BAIRD
Keyword(s):  
Isotope Dilution ◽  
Venous Blood ◽  
Human Testis ◽  
Peripheral Plasma ◽  
Oestrone Sulphate ◽  
Antecubital Vein ◽  
The Mean ◽  
Almost All ◽  
Peripheral Conversion ◽  
Venous Plasma

The concentrations of five steroids in samples of spermatic venous blood collected from 17 men undergoing ligation of varicocoeles were compared with those in samples from the antecubital vein. There was evidence of testicular secretion of testosterone, androstenedione, oestradiol-17β and oestrone, since the ratios of the mean concentrations in spermatic venous plasma to those in peripheral venous plasma were 77·2, 9·1, 28·7 and 1·6 respectively. The testicular secretion of oestrone sulphate was minimal; the ratio of the mean concentrations in spermatic and peripheral plasma was 1·07. These results support the view derived from isotope dilution studies that almost all oestrone and oestrone sulphate in the circulation is derived from peripheral conversion of other precursor steroids.

THE CONCENTRATION OF PROGESTERONE IN THE PERIPHERAL PLASMA OF THE PREGNANT EWE

1969 ◽  
Vol 45 (3) ◽  
pp. 449-457 ◽  
Author(s):  
J. M. BASSETT ◽  
TANA J. OXBORROW ◽  
I. D. SMITH ◽  
G. D. THORBURN
Keyword(s):  
Protein Binding ◽  
Early Pregnancy ◽  
Luteal Phase ◽  
Progesterone Concentration ◽  
Plasma Progesterone ◽  
Peripheral Plasma ◽  
High Concentrations ◽  
Pregnant Ewe

SUMMARY The progesterone concentration in the peripheral plasma of ewes throughout pregnancy has been determined by a protein-binding method. Plasma progesterone concentrations during the first 50 days of pregnancy (2–3 ng./ml.) were not significantly higher than peak concentrations during the luteal phase in cycling non-pregnant ewes, but there was no decrease in the concentration 15–20 days after mating as occurs in non-pregnant ewes. Between 50 and 120 days after mating the plasma progesterone concentration increased steadily to values 2–5 times that found in early pregnancy. These high concentrations were maintained until lambing. A decrease in progesterone concentration during the week preceding lambing was usually, but not always, observed. Mean plasma progesterone concentrations during the last 50 days of pregnancy in ewes with twins were approximately twice those in ewes with a single foetus.

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