IMMUNOCYTOCHEMICAL LOCALIZATION OF IGF-1, PDGF-A AND PDGF-RECEPTORS IN THE PORCINE AND BOVINE FEMALE REPRODUCTIVE TRACT     

E. Persson  H. Rodriguez-Martinez  V. Dantzer 《Reproduction in domestic animals》1993,28(3):205-206

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Sows Intramammarily Inoculated with Escherichia coli: Influence of Time of Infection,Hormone Concentrations and Leucocyte Numbers on Development of Disease     

U. Magnusson  A. Pedersen Mrner  A. Persson  E. Karlstam  S. Sternberg  H. Kindahl 《Zoonoses and public health》2001,48(7):501-512

The aim of this study was to identify factors that influence the development of disease in sows inoculated with Escherichia coli in the mammary gland. Ten cross‐bred primiparous sows were intramammarily inoculated with living E. coli bacteria at different time points before parturition: seven sows within 48 h before parturition and three sows approximately 96 h before parturition. Before and after inoculation, blood samples and mammary gland biopsy specimens were collected and clinical observations were made. All seven sows inoculated close to parturition developed a rectal temperature of >39.5°C during the first 48 h post‐partum and two of them also showed other signs of clinical disease. In the sows inoculated 4 days before parturition, the rectal temperature never exceeded 39.5°C during the first 48 h post‐partum and none of them showed any other sign of clinical disease. There was a tendency (P < 0.1) that histological signs of mastitis were more frequent in the sows inoculated close to parturition. There were no overall differences between the two groups of sows in plasma concentrations of cortisol, oestradiol‐17β and 15‐ketodihydro‐PGF_2α before inoculation. Before inoculation, the number of neutrophils in the blood was overall higher (P < 0.05) in the group of sows that were inoculated close to parturition. In comparison, the number of lymphocytes before inoculation had a tendency (P < 0.1) to be lower in that group. The data suggest that the time of infection of the mammary gland relative to parturition and the number of circulating neutrophils at the time of infection influence the development of clinical coliform mastitis in the sow.  相似文献   

Effects of Draft Loaded Training on Circulatory and Blood Lactate Responses During Exercise in Horses     

Marianne Gottlieb  B. Essn-Gustavsson  S.G.B. Persson 《Journal of Equine Veterinary Science》1991,11(1)

Five Standardbred trotters were trained on a treadmill 3 times as week for 12 weeks by intervals of draft loaded exercise. The draft load was 34 kilopond and the velocity approximately 7 m/sec -1. Standardized exercise tests with sequentially increasing speed were performed before, and after 4, 8 and 11 weeks of training. No significant effects of training were seen on heart rate response to exercise or on total blood volume, red cell volume and plasma volume when related to bodyweight, whereas less blood lactate (p<0.05) was accumulated. Blood lactate response to exercise may therefore be valuable for monitoring metabolic adaptations to training by draft loaded exercise.  相似文献   

Epidemiology of porcine neonatal steatorrhoea in Sweden. 1. Prevalence and clinical significance of coccidal and rotaviral infections   总被引：1，自引：0，他引：1  

O Nilsson  K Martinsson  E Persson 《Nordisk veterinaermedicin》1984,36(3-4):103-110

A study of neonatal steatorrhoea in unweaned piglets was carried out in randomly visited herds. Isospora suis and rotavirus were shown to be incriminated in this type of enteric disease and these agents may be considered important enteropathogens for 1-3-week-old piglets in Sweden. More extensive studies of I. suis were undertaken in one large herd. It was found that steatorrhoea may appear in 4-day-old piglets but oocysts were not detected until some days latter. Piglets that were shedding I. suis were not necessarily steatorrhoeic but oocysts were more frequently found in steatorrhoeic faeces than in faeces of normal consistency. The earliest oocyst output was detected at 5 days of age, the average litterage at first appearance being 12.8 +/- 4.0 days. The occurrence of I. suis oocysts in piglets did not correlate with the oocyst output in sows, which almost exclusively included genus Eimeria. Repeated parasitological and virological examination of steatorrhoeic faecal samples from 5-10 litters per herd at an age of 1-3 weeks would be helpful for making a herd diagnosis.  相似文献   

Studies on norepinephrine-induced hypocalcemia in sheep before and after thyroidectomy     

J Luthman  G Jonson  J Persson 《Acta veterinaria Scandinavica》1972,13(1):20-30

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Theophylline-induced hypocalcemia in sheep     

J Luthman  G Jonson  J Persson 《Acta veterinaria Scandinavica》1972,13(4):484-491

Intravenous infusion of theophylline at rates of 1 and 2 mg/kg/min. caused marked hypocalcemia in intact sheep. The plasma concentration of NEFA increased. The lipolytic but not the hypocalcémie effect of theophylline was completely inhibited by nicotinic acid. This fact suggested that lipid mobilization and hypocalcemia were not related. The effects of parathyroid hormone are mediated by 3′, 5′AMP, and methyl xanthines are known to inhibit the inactivation of 3′, 5′AMP. There is, however, evidence in the literature that excessive amounts of 3′, 5′AMP inhibit rather than increase bone resorption. It was therefore suggested that the used amounts of theophylline caused an excessive accumulation of 3′, 5′AMP in bone tissue, so that bone resorption was inhibited and hypocalcemia developed.Keyword: theophylline, phosphodiesterase, cyclic adenosine 3′, 5′ monophosphate, hypocalcemia  相似文献   

Risk factors associated with the incidence of veterinary-treated clinical mastitis in Swedish dairy herds with a high milk yield and a low prevalence of subclinical mastitis   总被引：2，自引：0，他引：2  

Nyman AK  Ekman T  Emanuelson U  Gustafsson AH  Holtenius K  Waller KP  Sandgren CH 《Preventive veterinary medicine》2007,78(2):142-160

We conducted a case-control study to investigate factors associated with the incidence rate of veterinary-treated clinical cases of mastitis (IRVTCM) in Swedish dairy herds with the overall objective to reduce the incidence of clinical mastitis (CM) and excessive use of antibiotics. Herds with documented high milk yield, low prevalence of subclinical mastitis and high (27.3-67.5 cases/100-cow years=case) or low (0.0-10.8 cases/100-cow years=control) IRVTCM were selected for this study. One hundred and fifty-eight herds participated. Logistic-regression models were used to assess statistically significant risk factors associated with a high or low IRVTCM. HI-herd farmers more often contacted a veterinarian for treatment of a cow with CM as soon as the milk appearance was altered, compared to LO-herd farmers that more often waited until the general condition of a cow was altered. HI-herd farmers also treated more cows due to high somatic-cell counts during lactation and/or at drying off. There were more high-yielding cows with dirty lower hind-legs, a higher percentage of first-parity cows and a higher incidence of veterinary-treated teat injuries in HI-herds. HI-herd farmers had their cows claw-trimmed more than once per year, compared to LO-herd farmers that had their cows claw-trimmed only once per year, and the condition of silage storage at HI-farms more often had one or more remarks. LO-herds consisted more often of cows of the Swedish Red and White breed, and their roughage diet was more often complemented with only commercial concentrates compared to HI-herds that more often fed grain in combination with commercial concentrates. The herds participating in this study were all well managed herds, and the attitude towards treatment and production seemed to influence the IRVTCM more than environmental factors.  相似文献   

Aggression and cortisol levels in three different group housing routines for lactating sows     

Ola Thomsson  Ann-Sofi Bergqvist  Ylva Sjunnesson  Lena Eliasson-Selling  Nils Lundeheim  Ulf Magnusson 《Acta veterinaria Scandinavica》2015,57(1)

Background

Lactating sows in Swedish organic piglet production are commonly group-housed with piglets in a multi-suckling pen within 14 days after farrowing. Nursing behaviour may be disturbed when lactating sows are moved to a new environment and mixed with other sows, as they spend more time fighting with other sows and exploring the new surroundings. This can disrupt the inhibitory effect of suckling on ovarian activity and increase the risk of lactational oestrus, making efficient reproductive management difficult. Therefore this study evaluated aggression and levels of the stress hormone cortisol in lactating sows group-housed together with their piglets at one (W1), two (W2) or three (W3) weeks post farrowing.

Results

There was no significant difference (P > 0.05) between the three management routines (W1, W2, W3) regarding number of attacks initiated or received in the mixed group. After mixing, W2 sows had a lower number of shoulder scratches (P < 0.05) than W3 sows. Among the W3 sows, there was a lower (P < 0.01) cortisol concentration in saliva when sows were group housed compared to when they were individually housed. The cortisol response, measured as variation in cortisol concentration in saliva, was also lower (P < 0.05) in group-housed W3 sows compared with W1 sows.For all management routines, sows already living in the new environment (resident sows) initiated more attacks (P < 0.001) and received fewer attacks (P < 0.01) than sows entering the new environment (intruder sows). Overall, multiparous sows initiated more attacks and received fewer attacks than primiparous sows (P <0.001).

Conclusions

Overall, the results suggest that mixing and group housing sows at three weeks post farrowing is less stressful than mixing and group housing sows at one week post farrowing. The results also indicate that parity and whether a sow is a resident or intruder in the group housing environment may have an effect on aggression levels when sows are group-housed.  相似文献   

Relationships between vitamin A, iron status and helminthiasis in Bangladeshi school children     

Persson V  Ahmed F  Gebre-Medhin M  Greiner T 《Public health nutrition》2000,3(1):83-89

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Effects of liming on carbon and nitrogen mineralization in coniferous forests     

Tryggve Persson  Anders Wirén  Stefan Andersson 《Water, air, and soil pollution》1990,54(3):351-364

A temporary decline in tree growth has often been observed after liming in coniferous forests poor in N but seldom in forests rich in N. To test the hypothesis that the decline was caused by decreases in N supply, C and N mineralization were estimated in incubated soil: (1) after liming in the laboratory, and (2) after earlier liming in the field. Liming increased the C mineralization rate in needle litter, mor humus and 0 to 5 cm mineral soil for a period of 40 to 100 days at 15°C. After that period, liming had no effect on the CO₂ evolution rate in materials poor in N (C:N ratios 30 to 62) but increased the CO₂ evolution rate in materials rich in N (C:N ratios 24 to 28). When liming induced nitrification, the CO₂ evolution rate was reduced. Liming resulted in lower net N mineralization rate in needle litter and mor humus. The reduction was more pronounced when NH ₄ ⁺ was the only inorganic form than when NO ₃ ^? was the predominant form. The reason is probably that chemical fixation of NH₃ and amino compounds increases with increasing pH. Because of the fixation, the incubation technique most likely underestimated the mineralized N available to the roots. Taking this underestimation into consideration, liming initially reduced the N release in the litter layer. In the other soil layers, liming increased the N release in soils rich in N and had only small effects in soils poor in N. For the total N supply to the roots in the litter, humus and 0 to 5 cm mineral soil layers, liming caused a slight reduction in soils poor in N and a slight increase in soils rich in N. Data on tree growth corresponded with these results. The hypotheses that tree growth depressions can be caused by reduced N supply after liming and that tree growth increases can be caused by increased N supply after liming thus seem reasonable.  相似文献