Wyniki wyszukiwania - AGRO

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Activity of monoamine oxidase in the hypothalamus of ewes after protracted exposure to gamma radiation

100%

Pastorova B., Stanikova A., Sopkova D., Maracek I., Bugarsky A., Danko J.

Bulletin of the Veterinary Institute in Puławy

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2004

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tom 48

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nr 2

2

Ovulation level and prolificacy in ewes depending on their age, birth type and percentage of prolific genotype

86%

Kareta W., Korman K., Cegla M.

Reproductive Biology

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2006

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tom 06

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nr Suppl.2

3

Does prolactin influence the hypothalamo-pituitary GnRH-LH system in preovulatory-phase ewes?

86%

Misztal T., Romanowicz K., Wankowska M., Wojcik-Gladysz A., Polkowska J.

Reproductive Biology

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2005

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tom 05

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nr 1

4

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Level of reproduction traits of ewes in blackhead sheep and growth of their offspring

86%

Szewczuk M., Lachowski W., Zurawski G., Chocilowicz E., Czerniawska-Piatkowska E.

Acta Scientiarum Polonorum. Zootechnica

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2011

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tom 10

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nr 2

The investigations were carried out in a sheepfold located in the Pomeranian Province, Poland. Sheep were evaluated in terms of reproduction traits of ewes, nursing success, and the weight at birth of their lambs. The herd achieved a generally high level of reproduction traits, similar to reference values for the breed published by the Polish Sheep BreedingAssociation for the years 2005–2009. The mean fertility index for the studied period remained at a level 78.2%, prolificacy 133.8%, and lamb nursing success 86.8%, whereas the mean index of reproduction performance was 90.8%. Equally high values were observed for the growth of the offspring. Until 75 days of age, both body weight and daily gains of singles were higher compared to those of lambs born from multiple births. The ram lambs attained higher body weight and daily gains as compared to the ewe lambs of the same age.

5

The role of GABAA and GABAB receptors in the control of GnRH release in anestrous ewes

86%

Tomaszewska-Zaremba D., Przekop F.

Reproductive Biology

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2006

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tom 06

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nr Suppl.2

6

Etiological factors of mastitis in Polish Merino ewes

86%

Krzyscin P.

Annales Universitatis Mariae Curie-Skłodowska. Sectio EE: Zootechnica

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2007

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tom 25

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nr 1

7

Effects of levamisole on pregnancy in ewes

86%

Pancarci S. M., Gungor O., Gurbulak K., Cenesiz M., Kaya M., Cenesiz S., Guzeloglu A.

Bulletin of the Veterinary Institute in Puławy

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2007

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tom 51

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nr 2

The effects of levamisole, as an anthelmintic or immunomodulator, on pregnancy were investigated in ewes. Immunomodulatory and anthelmintic doses of levamisole and physiologic saline were injected on days 0 (oestrus), 7, 14, and 21 in group 1 (immunomodulatory dose; n=7), group II (anthelmintic dose; n=6), and group III (control; n=6), respectively. The first service pregnancy rate, tended to be lower (P<0.06) in group I (28.6%) compared to that of groups II (83.3%) and III (83.3%). Plasma progesterone (P₄) concentration was significantly higher (P<0.05) in group II compared to that of group III on day 3, and there was a treatment x day interaction (P<0.05). No effect of levamisole treatments on plasma P₄ concentrations was detected once pregnancy was established. There was a numeric decline in plasma cholesterol concentrations in group II, compared to group I or III on day 3. In conclusion, levamisole as an immunomodulator is detrimental for the establishment of pregnancy, possibly by stimulating general and intrauterine immunity.

8

Effect of GnRH implant [deslorelin] with different formulation on fertility and delay of oestrous cycle in ewes

86%

Gungor O., Pancarci S. M., Cenesiz M., Beceriklisoy H. B., Kanca H.

Bulletin of the Veterinary Institute in Puławy

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2007

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tom 51

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nr 1

The reversibility of anoestrus caused by long-acting GnRH analogue (deslorelin), and the effectiveness of GnRH analogue to induce standing oestrous, and in consequence to the retardation of breeding season, was investigated. During the transition period, 26 fat tailed breed ewes were randomly divided into 3 groups. GnRH analogue Ovuplant and Suprelorin were inserted under the neck skin in group I (n=7) and group II, respectively. No administration was applied in group III (control group, n=10). Suprelorin was removed 60 d after the implant's insertion. The initiation of sexual activities based on the day of progesterone increase, and the first standing oestrous were 12.9±1.86, 34.7±9.69, 81.9±6.31, and 27.3±1.94, 48.3±9.24, 96.9±5.76 in control, Ovuplant and Suprelorin was administered to groups; respectively (P<0.001). In conclusion, deslorelin administration resulted in reversible anoestrus in ewes. During the 60 d experimental period, Suprelorin effectively suppressed sexual activity; therefore, Suprelorin could be used to delay the breeding season.

9

The composition of fatty acids and cholesterol content in the milk of small ruminants

86%

Dankow R., Cais-Sokolinska D., Pikul J.

Polish Journal of Natural Sciences

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2002

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tom 11

10

Excretion of oxytetracycline residues to the milk of ewes after intramuscular administration

86%

Nagy J., Sokol J., Rozanska H., Turek P., Cabadaj R., Popelka P.

Bulletin of the Veterinary Institute in Puławy

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1999

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tom 43

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nr 2

After the intramuscular administration of Engemycin L.A. inj. ad us. vet. (0.8 ml. 10kg⁻¹) to seven ewes for four consecutive days, the milk samples were collected at every 12 h of the experiment, from 0 to 166 h. The milk samples were analysed by the high performance liquid chromatography (HPLC) method. Twelve hours after the beginning of the experiment, all milk samples were positive for the presence of oxytetracycline (OTC) residues. The maximum mean concentrations were reached 12 h after the final administration (3.67 μg.g⁻¹). The OTC residues were not detected in any milk sample 84 h after the final administration.

11

Expression of NPY-immunoreactive neurons in the hypothalamus of the cycling ewe

86%

Polkowska J., Wankowska M., Wojcik-Gladysz A.

Folia Histochemica et Cytobiologica

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2006

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tom 44

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nr 1

12

Morphological changes in endothelial cells of uterine artery of cycling and ovariectomized-estradiol treated ewes

86%

Zezula-Szpyra A., Gawronska B., Skipor J.

Folia Morphologica

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1996

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tom 55

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nr 4

13

Evaluation of a combined vaccine against staphylococcal mastitis in ewes

86%

Hadimli H. H., Erganis O., Kav K., Sayin Z.

Bulletin of the Veterinary Institute in Puławy

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2005

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tom 49

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nr 2

14

Leptin effect on nitric oxide and GnRH-induced FSH secretion from ovine pituitary cells in vitro

86%

Kosior-Korzecka U., Bobowiec R.

Journal of Physiology and Pharmacology

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2006

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tom 57

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nr 4

The secretion of gonadotrophins from anterior pituitary cells can be modulated by leptin and signals originating from the immune system, among others, by nitric oxide (NO). There are some studies that have demonstrated a role for leptin and NO in the regulation of FSH in rodents, however, no similar data are available in regard to ewes. Therefore, the objective of the present study was to analyse the leptin effect on GnRH-induced FSH secretion from the ovine anterior pituitary cells in vitro. Additionally, the influence of leptin on NO release and its role in the GnRH and leptin–modulated secretion of FSH from pituitary gland of ewes was investigated. The obtained results show that the influence of leptin on FSH secretion is biphasic. Leptin in concentration 10-8 and 10-7 M/l significantly enhances, whereas 10-6 and 10-5 M/l of leptin suppresses FSH secretion from the pituitary cells in comparison to the control. The secretion of FSH and NO release under the influence of leptin are in very high positive correlation (r=0.77). The inhibition of NO synthesis with L-NAME, instead, disables leptin from the stimulation of FSH secretion.

15

Effect of reduced energy diet on some blood biochemical indicators in the late pregnant ewes

86%

Oztabak K., Durak H., Ates A.

Medycyna Weterynaryjna

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2005

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tom 61

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nr 05

16

Biogenic amines in ewe's milk lump cheese and bryndza

86%

Dicakova Z., Dudrikova E., Cabadaj R.

Bulletin of the Veterinary Institute in Puławy

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2004

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tom 48

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nr 1

17

Effect of histamine on the myoelectrical activity of uterus in sheep sensitized and non-sensitized by stilboestrol

86%

Dejneka J., Zieba D., Zawadzki W.

Polish Journal of Veterinary Sciences

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1998

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tom 01

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nr 1

Experiments were carried out on seven anestrus ewes. The animals were implanted with bipolar electrodes in the horns and corpus uteri. The electrical activity was registered by Reega Duplex electroencephalograph. The experiments were carried out on non-sensitized ewes and ewes sensitized by stilboestrol. The sheep were first fitted with an external jugular vein catheter and histamine (Histaminům hydrochloricum - Polfa) - 3 μg . kg-1 • min-1 - or H1 -receptors blocker (Clemastinum-Polfa) - 50 μg • kg-1 - were introduced. It was found that in sheep sensitized by stilboestrol histamine caused an increase in myoelectrical activity of the uterus by stimulation of H1 - histaminergic receptors.

18

Production performance of ewes in the Podlasie Region

86%

Niedziolka R., Kaluza H., Pieniak-Lendzion K., Fedorczuk D.

Natural Sciences

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1999

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tom 02

19

Effect of energy restriction on serum cortisol and its faecal metabolite [11,17-dioxoandrostan] in pregnant ewes

86%

Ates A., Altiner A., Ozpinar A., Mostl E.

Bulletin of the Veterinary Institute in Puławy

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2008

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tom 52

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nr 3

The objective of the study was to investigate the effect of an energy restriction on serum cortisol and its faecal metabolite (11,17-dioxoandrostan) in Chios ewes in late gestation. Twenty pregnant and ten non-pregnant out of 38 randomly selected ewes were detected with ultrasound and were separated into three groups (n=10) on day 105 after mating: normal energy fed pregnant group (NE), restricted energy fed pregnant group (RE), and non-pregnant group (NP). Blood samples were taken on days 117, 130, and 144 of pregnancy and faecal samples were taken twice a week starting on day 106 of pregnancy from both pregnant and non-pregnant ewes. After extraction of serum and faecal samples, concentrations of cortisol and 11,17-dioxoandrostan (11,17- DOA) were measured. A significant decrease in RE was determined only on day 144 of pregnancy (P≤0.05). Between the two pregnant groups (NE and RE), a significant difference was found only on day 144; at this period, RE had lower serum concentrations. RE had significantly lower 11,17-DOA concentrations in late pregnancy than NE. In pregnant ewes, the levels decreased in a late gestational period. The present data shows that in ewes fed 14.47% crude protein and 8.82 MJ /kg of metabolic energy in late pregnancy, pregnancy toxaemia does not occur. We suggest that the determination of Cortisol metabolites in faeces is more objective and safe than that of serum Cortisol concentrations.

20

Effect of sodium selenite injection on selenium and magnesium concentrations in the blood serum of ewes and their offspring

86%

Bik D.

Bulletin of the Veterinary Institute in Puławy

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1999

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tom 43

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nr 2

The study was performed on pregnant ewes and their progeny. The experimental group of ewes was given injections of 5 mg selenium in the form of sodium selenite. The sodium selenite s.c. injections resulted in monre than a triple, significant increase in the selenium level in ewes, at the first month as compared to the initial concentration of 0.42±0.11 to 1.38±0.21 μmol/l. Also in lambs a marked increase in selenium was noticed in the first and fifth weeks of life, but the levels of this element were by a half lower than in their mothers. Moreover, considerable diminution of magnesium concentration was observed in both groups: from 1.05±0.05 to 0.82±0.07 mmol/l in Group 1 of ewes in the second month following Na₂SeO₃ injection, and from 0.94±0.05 to 0.82±0.08 mmol/l in lambs, in the ninth week.

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