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Results 201 - 250 of 272
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Zhang X - - 1989
Cronolone (9 alpha-fluoro-11 beta-hydroxy-17 alpha-acetoxypregn-4-ene-3,20-dione) is widely employed to regulate breeding activity in the ewe, but its biological activity in the uterus of this and most other species has not been studied. In this study several in vivo uterus-related activities of cronolone have been examined in the sheep, mouse and ...
Bégin R - - 1989
In the sheep tracheal lobe model of silicosis, we have recently reported that total phospholipid, lecithin, and phosphatidylglycerol levels were elevated in lung lavage. To investigate further this observation, we obtained complete phospholipid profiles of lung lavage in 10 sheep exposed to saline only (Sa group), 10 sheep exposed to ...
Dubey J P - - 1988
Histological sections of tongues, esophagi, and diaphragms from 512 adult ewes from the northwest United States and Texas were examined for Sarcocystis spp. Sarcocysts were found in sections of 82.1% of 504 tongues, 44.4% of 478 esophagi, and 51.7% of 89 diaphragms. Sarcocystis tenella was the predominant species and was ...
Hanson M A - - 1988
The information gained about the afferent traffic from carotid arterial baro- and chemoreceptors by direct recordings made in the sheep fetus is reviewed. Less is known about aortic baro- and chemoreceptor discharge during this period, and virtually nothing is known about the discharge of other vagal mechano- or chemoreceptor afferents. ...
Andrew M - - 1988
The half-lives for coagulation factors in the healthy newborn infant are not known and may be different than for the adult. We measured the half-life for fetal sheep fibrinogen and compared it to the half-life of adult sheep fibrinogen. Fibrinogen was purified from adult and fetal sheep plasma and radiolabeled ...
Lindsay D R - - 1988
The recorded behaviour of wild species of Ovis at the beginning of the breeding season supports the proposal that mating is synchronized by the 'ram effect', a phenomenon already described in domestic sheep. Animals separate into exclusive male flocks, and flocks of females and young animals for most of the ...
Croteau R B - - 1987
To determine whether the bicyclic monoterpene olefins (-)-alpha-pinene and (-)-beta-pinene arise biosynthetically from the same monoterpene cyclase by alternate deprotonations of a common carbocationic intermediate, the product distributions arising from the acyclic precursor [10-2H3,1-3H]geranyl pyrophosphate were compared with those resulting from incubation of [1-3H]geranyl pyrophosphate with (-)-pinene cyclase from Salvia ...
Leymaster K A - - 1987
Crossbreeding of sheep is practiced to exploit simultaneously the use of additive and nonadditive genetic effects. The goal is to achieve optimal levels of performance appropriate for defined systems of sheep production and marketing. Although the beneficial effects of individual and maternal heterosis on sheep production have been well documented ...
Owens J A - - 1987
Endometrial caruncles were excised from 13 sheep (caruncle sheep) before pregnancy to restrict placental growth. In subsequent pregnancies, half the caruncle fetuses were growth retarded or small (weight more than 2 SD below mean weight for control fetuses) with the remainder, normal-sized (weight within 2 SD of mean weight for ...
Leon-Vizcaino L - - 1987
From 1970 to 1985, 973 outbreaks of abortion in sheep and 262 outbreaks of abortion in goats from southern Spain were studied. Of these, 1.7 and 2.6% respectively were caused by leptospiras, chiefly by the serovar pomona (11 flocks of sheep, 64.7%, and six herds of goats, 75.0%) and in ...
Tillet Y - - 1987
The localization of tyrosine hydroxylase was studied in the brain of sheep foetus during early ontogeny using immunohistochemistry. The first immunoreactive neurons appeared very early since they were found on day 30 of pregnancy in the medioventral part of the mesencephalic flexure. The distribution of the different catecholaminergic groups of ...
Siddiqi T A - - 1986
The pressor response to exogenously infused angiotensin II is decreased in normal human and ovine pregnancy when compared to the nonpregnant state. This study was designed to determine the mechanism for decrease in target organ sensitivity by examining pregnancy-induced changes in the affinity and number of angiotensin II receptors in ...
Scroop G C - - 1986
Intravenous injections of PGI2 (1.5-12 X 10(-5) nmol/ml blood volume) caused hypotensive responses which increased with dose in both fetal and neonatal sheep. In the fetus, as gestation advanced and basal heart rate declined, the predominant heart rate response to PGI2 changed progressively from bradycardia to tachycardia. In the neonate, ...
Belenko M - - 1986
Infusion of Escherichia coli endotoxin into sheep produces a form of acute lung injury that resembles the adult respiratory distress syndrome (ARDS). A large portion of the physiologic derangements produced by E. coli endotoxin in this model is thought to be granulocyte-dependent. We measured the level of L1, a granulocyte ...
Feinsod F M - - 1986
Epidemic Rift Valley fever is generally recognised when a higher than expected frequency of abortions and haemorrhages occurs in sheep and other livestock. Other infectious agents can cause similar clinical signs. In Egypt, an outbreak of abortions and haemorrhages in sheep and goats in 1982 was traced to intoxication with ...
Caton D - - 1986
Fourteen pregnant sheep were prepared for measurements of blood flow through a major uterine artery (UBF) and of arterial concentrations of estrone, estradiol, and progestagen. Five of the animals were ovariectomized. Measurements were made daily (n = 12) or every 4 h for 24 h (n = 4). Statistically significant ...
Dahiya R - - 1986
The ganglioside and neutral glycosphingolipid composition of fetal and adult sheep small intestinal mucosa were characterized and compared. Mono- and tetrahexosylceramide were the major neutral glycolipids of both fetal and adult tissue. Fetal mucosa, however, possessed a higher content of monohexosylceramide than its adult counterpart. Similarly, GD1a, GM3 and GM2 ...
Cepica S - - 1986
The localization of the Po2 locus controlling a polymorphic serum postalbumin was studied in 41 families of the Czech Landrace breed. The haplotypes involving six closely linked loci (S, Phi, Hal, H, Po2, Pgd) were determined for each family member. The crossovers observed between the H, Po2 and Pgd loci ...
Rosenfeld J - - 1986
Jimpy is a genetic disorder of mouse resulting in hypomyelination. In this study oligodendrocyte proliferation was examined in heterozygous carriers of the jimpy gene. The incorporation of [3H]-thymidine into DNA is increased in jimpy heterozygotes compared to controls. An autoradiographic analysis indicated that oligodendrocytes are the predominant neuroglial cell type ...
Sato A - - 1985
During the period between 1980 and 1983, a versatile experimental model for fetal physiology (chronic fetal preparation) was made using 26 pregnant Corriedale and Suffolk sheep. The sheep fetuses were removed from the uterus at the gestational ages of from 96 to 133 days. After performing cannulation of the carotid ...
Dahiya R - - 1985
The ganglioside and neutral glycosphingolipid composition of fetal and adult sheep colonic mucosa were characterized and compared. Mono- and tetrahexosylceramide were the major neutral glycolipids of both fetal and adult colons. Adult, but not fetal, mucosa also possessed di- and trihexosylceramide. Similarly, GD1a, GM3 and GM2 were found to be ...
Vernon R G - - 1985
The endocrine control of adipose tissue metabolism during pregnancy in sheep has been investigated. The number of insulin receptors of sheep adipocytes was increased during pregnancy. There was no apparent change in the concentration of serum insulin during pregnancy in sheep while the rise in serum progesterone concentration was smaller ...
Appleyard W T - - 1984
Plastic tags containing 8.5 per cent w/w cypermethrin or 10 per cent w/w permethrin reduced the severity of damage caused to sheep by the headfly Hydrotaea irritans. A similar pattern of protection extended from the tagged ewes to their untagged lambs. Tags containing 8.5 per cent w/w fenvalerate failed to ...
Dubey J P - - 1984
Eleven female goats (Nos. 1 to 11) were each inoculated orally with 10(4) sporocysts of Sarcocystis capracanis, and four female goats (Nos. 12 to 15) were not inoculated. Between 31 and 69 days after inoculation (DAI) goats were mated with a single buck; one goat (No. 5) did not breed. ...
Le Jambre L F - - 1984
Worm egg counts of yearling Angora or Merino wethers grazing in mixed flocks at either 4/ha or 8/ha were observed over a 5 month period. Based on faecal egg counts infection levels in the sheep increased for the first 3 months and then decreased as the animals developed resistance. Egg ...
Munday B L - - 1984
Immature, microscopic Sarcocystis gigantea sarcocysts were detected in experimental sheep from 1.3 to 4 months after dosing with sporocysts from cats. Mature, microscopic sarcocysts were also present at 4 months post-inoculation (p.i.). S. gigantea sarcocysts were 0.35 mm long at 8.5 months p.i. and gradually increased in size to 7.5 ...
Moore G S - - 1984
Female Dorset sheep were exposed in vivo to ambient ozone levels of 0.12 ppm, 0.25 ppm, 0.50 ppm, 0.70 ppm for 2.75 hours and the effects of this exposure upon erythrocytes were studied. Ozone exposure induced biochemical evidence of oxidant stress as indicated by decreases in GSH levels (at 0.5 ...
Dixson A F - - 1984
Plasma levels of vasoactive intestinal polypeptide (VIP) in the corpora cavernosa penis and dorsal penile veins greatly exceeded those measured in the limb or caudal veins during anaesthesia in various mammals (Bennett's wallaby, Barbary sheep, cheetah, puma, sooty mangabey, pigtail macaque and chimpanzee). Tactile stimulation of the penis immediately before ...
Shulkes A - - 1984
Although gastrin is found in adult gastric juice, rapid enzymatic destruction by pepsin in the acid environment makes a physiological role in the adult unlikely. Gastric pH in the fetal sheep is neutral so that gastric juice gastrin could be present, and if present, have a physiological function. The aim ...
Cotton C U - - 1983
Segments of fetal and maternal trachea, maternal bronchi from near-term sheep, and trachea and bronchi from nonpregnant adult sheep were excised and mounted as sheets in Ussing chambers. The conductance (G) for each group of tissues was similar (approximately 4 mS/cm-2); the short circuit current (Isc) ranged from 45-90 microA/cm-2. ...
Flint A P - - 1983
Concentrations of progesterone in arterial and ovarian, uterine and jugular venous plasma were determined in four Barbary sheep at various stages of pregnancy. The results, together with ovarian histology, show that the corpus luteum regresses before term in Barbary sheep, as in most breeds of domestic ewes. Uterine synthesis of ...
Reynolds J D - - 1983
The Peyer's patches (PP) of sheep have a number of important anatomical features and functional characteristics which are similar to tissues that have been classified as primary lymphoid organs. The prenatal maturation of PP occurs in the absence of any antigenic stimulus as immunogenic molecules are not normally encountered by ...
Bolton-Klug M E - - 1983
The purpose of the study was to determine if a near-maximum exposure to air at increased atmospheric pressure causes gross fetal malformations, decreased birth weight, or death when administered to pregnant sheep during peak development of the embryo. Twenty-eight timed-pregnant sheep were alternately assigned to a series of 25- or ...
Staples L D - - 1983
The study describes the effects of crude extracts of the fetal membranes of day 25 sheep conceptuses and of certain purified protein hormones and pregnancy-associated antigen on the mitogen-induced response of sheep peripheral blood lymphocytes (PBL) in vitro. A dose-dependent suppression of the proliferative response of PBL to phytohaemagglutinin, pokeweed ...
Willson J R - - 1983
Hyperbaric exposure during pregnancy in sheep: staged and rapid decompression. Undersea Biomed Res 1983; 10(1): 11-15. --Twelve sheep with dated pregnancies were exposed for 20 min to hyperbaric pressure comparable to 165 feet of sea water weekly between the 49th and 133rd days of pregnancy. Six were decompressed in stages ...
Siddiqi T A - - 1983
During human and ovine pregnancy, systemic pressor responses to infused angiotensin II are decreased when compared to the nonpregnant state. An increased circulating level of angiotensin II has been proposed as one of the possible mechanisms responsible for this refractoriness. The present study was designed to determine if increased pressor ...
Wilson R T - - 1983
In 1101 goats and 547 sheep kept under ranch conditions the liveweight development was measured and compared between their 10th and 550th day of life. Consideration was given to factors such as sex, parity, birth type, season of birth, and flock. Post-partum weights of the dams are given and analysed ...
Paisley L G - - 1982
The rosette inhibition test, which has been used to detect early pregnancy factor (EPF) and other immunosuppressive factors in the serum of pregnant mice, women, and sheep, was adapted for use in swine. Since the initial methods described for use of the assay were cumbersome and time consuming, our first ...
Hart R J - - 1982
The efficiency of 2-cyclopropylamino-4, 6-diamino-s-triazine CGA-72662 (proposed common name: cyromazine) for the control of blowfly strike was tested in fly cage and field trials on sheep. The safety to sheep and physico-chemical properties of the compound as they relate to blowfly control were also assessed. When the sheep were thoroughly ...
Sewell R B - - 1982
The bidirectional placental transfer of sodium [11,12-di-3H]chenodeoxycholate and sodium [14C]deoxycholate was studied in conscious pregnant sheep near term. In fetal-to-maternal studies, radiolabeled bile salt was injected into the fetal portal vein, and the daily excretion of radiolabel in maternal hepatic bile was measured over 3-4 days. In maternal-to-fetal studies, the ...
Wilkinson F C - - 1982
Merino sheep were artificially infested with lice, Damalinia ovis, and the quantity and processing performance of the wool they subsequently produced was compared with those of wool from uninfested sheep. The experiment was conducted in a winter rainfall region of Western Australia, and was repeated yearly for three years. Louse ...
Smith B S - - 1981
Seasonal changes in serum 25-hydroxyvitamin D were followed in pregnant and non-pregnant sheep kept indoors or at pasture. In housed sheep circulating levels depended on starting value, dietary intake and requirements. thus, in wethers given hay values declined steadily; in non-pregnant ewes on the standard diet values were constant; and ...
Heap R B - - 1981
Pyrogens were injected into unshorn pregnant and non-pregnant Soay and Clun Forest sheep and the effects on rectal temperature and thermoregulatory mechanisms monitored. Plasma concentrations of unconjugated oestrogens, progesterone and cortisol were measured in the sheep tested in late pregnancy. The effect of pyrogens was also examined in ovariectomized ewes ...
Maas J - - 1981
An inoculum of Anaplasma marginale was given (IV) to a splenectomized domestic goat and then was serially passed through 4 additional goats. The results indicated that goats can be latent carriers at 75 days after inoculation, but not at 208 days. There was no evidence of serial passage of A ...
Findlay J K - - 1981
This review analyses the endocrine recognition of pregnancy in the sheep. Particular emphasis is placed on the effect of a blastocyst on prostaglandin and protein metabolism in the endometrium. The preimplantation period is associated with increased prostaglandin content in the endometrium and uterine lumen, increased leucine incorporation into endometrial protein ...
- - 1981
This Memorandum outlines recommended safety tests for application to biological agents under consideration for widespread use for pest control. The basic principles utilized in developing these recommendations were that: (i) the hazards presented by microbial pesticides are inherently different from those associated with chemical pesticides and the tests used to ...
Fujimoto M - - 1980
Using the bullfrog retina, depth profiles of Burkhardt's PNR and of the ERG are compared under various recording conditions. When the retina is voltage-annulled so that there is no ERG potential outside the retina, the depth profile of the ERG changes to resemble that of the PNR. When there is ...
McCullough F S - - 1980
Although mollusciciding can be a cost-effective method of controlling schistosomiasis transmission, only one organic molluscicide, niclosamide, is now being produced commercially, and only a few compounds are at present being tested in the laboratory. In future, improved cost-effective use of molluscicides will require more precise knowledge of schistosomiasis transmission patterns ...
Chemtob S - - 1980
To investigate a possible mechanism involved in the regulation of 2,3-diphosphoglycerate (2,3-DPG) synthesis, 2,3-DPG mutase (DPGM) was measured in different mammals presenting large differences in 2,3-DPG concentration between fetal, neonatal and adult life to see the activity of this enzyme, necessary for 2,3-DPG synthesis, was related to the levels of ...
Bueno L - - 1979
Both slow waves and bursts of spike potentials were recorded prior to birth in dogs and sheep. At 0l7-0.8 of term the slow-wave frequency of the jejunum did not exceed 12/min. It increased in a similar way during the last stage of fetal life in sheep and after birth in ...
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