Recent experimental observations have shown that the thyroid gland plays a dominant part in the induction and maintenance of anoestrus in ewes. The mechanisms of the anoestrous effects of the thyroid gland are still unclear. On the basis of experiments, in which after thyroidectomy at the onset of sexual activity LH production was maintained also during the spring months, iodothyronines have been supposed to stimulate the inhibitory effects of oestrogens upon the neuroendocrine centres that generate pulsatile LH secretion (Moenter et al., 1991; Webster et al; 1991). However, in our previous work (Bekeová et al., 1995) we observed significant changes in iodothyronine levels, mainly T3, in ewes treated with FSH, LH-RH and oxytocin-based preparations in 24 and 72 h after parturition in the spring. Having made the above observations we suppose seasonal anoestrus to result rather from changes in thyroid and ovarian hormone interactions or from a decrease in thyroid hormone levels that is induced by a temporary decrease in sexual hormones in this phase of the year. Within investigations into the effects of thyroid hormones and their interactions in spring this study focused on the response of the thyroid gland and ovaries in anoestrous ewes to chlorsuperlutin and PMSG treatment in the second half of May. Eighteen Slovak Merino ewes were divided into an experimental and a control group counting 15 and 3 animals, respectively. The experimental animals were each treated with 20 mg chlorsuperlutin (Agelin Spofa vaginal inserts) for 12 days. On day 12 the inserts were removed and each animal was given 500 IU PMSG. In the same time intervals the controls were treated with a placebo (sterile polyurethane, saline). Blood samples were obtained prior to swab insertion (day 0) and in 4-day intervals under chlorsuperlutin treatment (days 4, 8 and 12). For the first 24 h after PMSG-treatment blood samples were taken in 2-hour intervals and then in 48 and 72 h. For radioimmunological determination of T4, T3, E2 and P4 levels the RIA-test-T4, RIA-test-T3, RIA-test-Estra and RIA-test-Prog commercial kits (manufacturer: URVJT Kosice, Slovak Republic) were used, respectively. When compared to the almost constant but significantly lower T4 values in the controls (P < 0.05; P < 0.01; Tab. II, Fig. 1), a repeated massive release of T4 occurred in the experimental animals (Tab. I, Fig. 1). Its first peak observed 4 h after PMSG was significant in comparison both to Day 0 and the controls (P < 0.05 and P < 0.01, respectively). The same was true for the 2nd peak observed 20 h after PMSG-treatment (P < 0.001 and P < 0.01, respectively). The dynamics of T3 was similar in both groups. The transitory increase in T3 levels observed in the controls (Tab. II, Fig. 2) on day 4 of chlorsuperlutin treatment was insignificant when compared to day 0. Both the decrease observed between day 8 and of chlorsuperlutin treatment and 20 h after PMSG gavage, and the increase between 24 and 72 h appeared to be insignificant. Comparison to day 0 revealed increased T3 levels in the experimental group (Tab. I, Fig. 2) on days 4 and 8 of chlorsuperlutin treatment, the levels of significance being P < 0.01 and 0.05, respectively. Between 8 and 24 h after PMSG-gavage, in contrast to the controls, T3 levels in the experimental animals acquired the character of a slowly increasing rhythmic pulsation. At 72 h after PMSG a significant decrease occurred (P < 0.05). In the control animals (Tab. II, Fig. 3) E2 levels revealed interchanging episodes of insignificant increase and decrease beneath test sensitivity. In the experimental ewes (Tab. I, Fig. 3) a double-peaked elevation of E2 could be observed, the first (insignificant) peak occurring 18 and 20 h and the second (significant) one 48 and 72 h following PMSG treatment (P < 0.05 and 0.01, respectively). The inter-group differences were significant at the level of P < 0.05 in each case.

• MeSH
• chlormadinon analogy a deriváty   farmakologie   MeSH
• estradiol krev   MeSH
• gonadotropiny koňské farmakologie   MeSH
• hormony štítné žlázy krev   MeSH
• kongenery progesteronu farmakologie   MeSH
• ovce krev   MeSH
• progesteron krev   MeSH
• roční období MeSH
• thyroxin krev   MeSH
• trijodthyronin krev   MeSH
• zvířata MeSH
• Check Tag
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• chlormadinon MeSH
• chlorsuperlutin MeSH Prohlížeč
• estradiol MeSH
• gonadotropiny koňské MeSH
• hormony štítné žlázy MeSH
• kongenery progesteronu MeSH
• progesteron MeSH
• thyroxin MeSH
• trijodthyronin MeSH

Observation of hematological indices which are a reflection of physiological processes in the individual phases of the reproductive cycle, presents one of the methods of controlling the homeostasis of the ewe's organism. This work focused on the observation of selected indices during synchronization treatment and in the first days of pregnancy The experiment included 10 conventionally bred animals. Blood was obtained from the v. jugularis into an oxalate mixture on days 0 (date of synchronization), 3, 7 and 14 of Agelin implantation, on the day of oestrus and days 7, 14, 17 and 34 of pregnancy. Erythrocyte counts were determined by the Bürker flask method, hemoglobin concentrations by spectrophotometry and packed cell volume (PCV) by the method of Janetzki. For leucocyte count determination the Bürker flask method with Turk's solution was used; the percentual proportion of leucocytes was stated by the leucogram. During synchronization treatment and pregnancy the mean erythrocyte counts ranged from 9.16 +/- 0.81 to 9.74 +/- 0.61 T/l and from 9.09 +/- 0.84 to 9.47 +/- 1.11 T/l, respectively. Hemoglobin concentrations oscillated between 10.71 +/- 1.02 and 11.83 +/- 1.01 g/l. PCV values reached between 32.44 +/- 2.18 and 39.33 +/- 2.73 l/l with a significant increase on day 14 of Agelin implantation and days 17 and 34 of pregnancy (P < 0.05). This dynamics of the red blood components points to the occurrence of functional-morphological changes in the sexual apparatus during oestrus and Agelin treatment. Through mediation by the vascular system a change in the mean values may also occur (Kresan et al., 1979).(ABSTRACT TRUNCATED AT 250 WORDS)

• MeSH
• hematokrit veterinární   MeSH
• hemoglobiny analýza   MeSH
• krevní obraz veterinární   MeSH
• ovce krev   MeSH
• synchronizace říje * MeSH
• těhotenství u zvířat krev   MeSH
• těhotenství MeSH
• zvířata MeSH
• Check Tag
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• hemoglobiny MeSH

In this work recruition and growth of follicles and quality of the largest ones were determined and compared in the individual stages of the bovine oestrous cycle (stages I, II, III and IV - days 1-4, 5-10, 11-17 and 18-21, respectively) in relation to the presence of the corpus luteum and an oestrogen-dominant follicle on the ovary. The maximum proportions of small (< 4.9 mm), medium-sized (5.0-9.9 mm) and large (> 10 mm) follicles were observed in stages IV (93.4%), I (16.6%) and III (4.8%), respectively. The results of our study revealed the presence of the large oestrogen-dominant follicle that have negative effects upon the presence of another large follicle on the ovary and upon the recruition of small (< 4.9 mm) follicles. On the contrary, the presence of a large oestrogen-dominant follicle positively influenced the occurrence of 5-9.9 mm follicles in all stages of the cycle. No effects of the CL were observed upon the presence of medium-sized and large follicles. Although the differences were insignificant, negative effects of the CL were observed in relation to the occurrence of small (< 4.9 mm) follicles.

• MeSH
• corpus luteum fyziologie   MeSH
• estradiol metabolismus   MeSH
• estrogeny metabolismus   MeSH
• estrus fyziologie   MeSH
• ovariální folikul metabolismus   fyziologie   MeSH
• progesteron metabolismus   MeSH
• skot fyziologie   MeSH
• zvířata MeSH
• Check Tag
• skot fyziologie   MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Názvy látek
• estradiol MeSH
• estrogeny MeSH
• progesteron MeSH

The active transport of mineral substances by cell membranes plays an important role in the neurohumoral regulation of reproductive processes in farm animals. A great importance is attributed to lipoproteins as sources of the primary precursor of steroid synthesis in the placenta and ovaries (Knopp et al., 1986; Grummer et al., 1988). The effects of hormones on K metabolism in the blood serum of ewes were studied by Hawk et al. (1961). Krajnicáková et al. (1993) observed the dynamic changes of electrolytes in the course of the reproductive cycle in ewes. Na and K levels and their relation to ovarian hormones were determined in the systemic blood stream of ewes during oestrus synchronization and pregnancy. Ten Slovak Merino ewes aged 3-5 years and weighing 40-50 kg were included in the experiment. The animals were reared conventionally. A feed ration consisted of silage, hay, feeding beet-pulp, straw and in the last two months of pregnancy it was supplemented with roughage. Water and salt were given ad libitum. Blood samples were obtained from the jugular vein prior to synchronization (day 0) and on days 3, 7 and 14 of synchronization with Agelin vaginal implants. After removing the implants the animals received 500 I.U. PMSG (Pregnant Mare Serum Gonadotropin). The animal in oestrus cycle were inseminated with fresh diluted semen. Reinsemination was not performed in this experiment. Sampling was continued on the day of insemination and on days 7, 14 and in month 2, 3, 4 and 5 of pregnancy. Na and K levels were measured by atomic absorbtion spectrophotometry using the Atom Spek device (RANG-HIGLER). Progesterone (P4) and 17 beta-oestradiol (E2) levels were assayed radioimmunologically using the respective kits (RIA-test-PROG and RIA-test-ESTRA) manufactured by URVJ Kosice. During the observation period Na levels fluctuated within 131.50 +/- 1.71 and 153.55 +/- 4.77 nmol/l of serum (Tab. I) and significantly decreased between day 14 of synchronization and the end of the investigation (P < 0.05; P < 0.01; P < 0.001). Potassium levels were observed to significantly decrease from the day of insemination on, throughout the first days of pregnancy and the above-mentioned months of gravidity, the values ranging between 4.57 +/- 0.52 and 3.93 +/- 0.36 nmol/l.(ABSTRACT TRUNCATED AT 400 WORDS)

• MeSH
• draslík krev   MeSH
• estradiol krev   MeSH
• ovce krev   MeSH
• progesteron krev   MeSH
• sodík krev   MeSH
• synchronizace říje krev   MeSH
• těhotenství u zvířat krev   MeSH
• těhotenství MeSH
• zvířata MeSH
• Check Tag
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• draslík MeSH
• estradiol MeSH
• progesteron MeSH
• sodík MeSH

Triacylglycerols as the sources of cholesterol, the primary precursor of steroid synthesis, are one of the factors that limit the speed of steroidogenesis. Synthesis and resynthesis of triacylglycerols depend, in addition to other factors, on phosphatid hydrolysis that is controlled during pregnancy by placentary ALP (Sumikawa et al., 1987) and the FFA pool in the systemic blood stream. Enzymes participating in FFA release from the fat tissue are affected by thyroid hormones and TSH (Mayes, 1977). In view of the above facts, this work was aimed at the observation of changes in alkaline phosphatase (ALP), thyroxine (T4), triiodothyronine (T3), 17 beta-oestradiol (E2) and progesterone (P4) levels and their mutual correlations in the systemic blood stream of sheep from the first day after parturition to day 51 p.p. Our attention was paid to the possible delayed effects of placentary ALP and thyroid hormones on the synthesis of ovarian steroids in puerperal ewes. Nine merino sheep were included in the experiment; they lambed in the first decade of February and were kept together with their lambs in a classical sheep-cot on deep litter. The animals were fed according to the Czechoslovak State Standard CSN 46 7070. Blood samples were taken from the v. jugularis from 8 to 9 o'clock a.m. 24 hs (day -1) prior to parturition (a.p.), 36 hs and on days 4, 7, 14, 17, 21, 25, 34, 42 and 51 after parturition (p.p.). As compared with day -1 (2.6 +/- 1.08 mu kat/l), ALP concentrations showed a decrease with minimum values occurring on day 17 (1.34 +/- 0.97 mu kat/l, P < 0.05). T4 concentrations also decreased from day -1 (59.4 +/- 9.69 nmol/l) to day 21 (54.89 +/- 11.06 nmol/l, P < 0.05). A similar decrease (from 1.82 +/- 0.33 nmol/l on day 1 to 0.85 +/- 0.32 nmol/l on day 21) could also be observed in T3 levels. As early as 36 hs p.p., the concentrations of both steroid hormones, E2 and P4, significantly decreased [from 2.45 +/- 0.65 and 9.46 +/- 0.34 nmol/l on day -1 to 0.30 +/- 0.24 and 0.05 +/- 0.08 nmol/l, respectively (P < 0.001)]. Throughout the period of investigation, apart from an unsubstantial increase in E2 values on days 17 and 42 and an episodic increase in P4 levels on day 34, the concentrations of both steroids had the values that were significantly lower than those observed on day -1.(ABSTRACT TRUNCATED AT 400 WORDS)

• MeSH
• alkalická fosfatasa krev   MeSH
• estradiol krev   MeSH
• hormony štítné žlázy krev   MeSH
• ovce krev   MeSH
• poporodní období krev   MeSH
• progesteron krev   MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• alkalická fosfatasa MeSH
• estradiol MeSH
• hormony štítné žlázy MeSH
• progesteron MeSH

Our investigations were concerned with dynamic changes in total lipids (CL), cholesterol (CHOL) and progesterone (P4) in blood serum of sheep in the period of oestrus synchronization treatment and during mating and gravidity. Our experiment was carried out using 10 animals housed under the conditions of productive rearing. Blood samples were taken from v. jugularis on day of swab application (day 0) and on days 3 and 7 of the action of Agelin vaginal swabs, on day of insemination, and on days 7, 14, 17 and in the 2nd, 3rd and 4th month of gravidity. Blood serum was used to determine total lipids and cholesterol by means of Bio-Lachema tests, and P4 concentrations employing RIA-test-Prog kits (URVJT, Kosice). A statistically significant decrease in concentrations of total lipids (Fig. 1, Tab. I) in sheep blood serum was recorded on day of insemination (P < 0.05) compared to day 0, with the value 1.59 +/- 0.31 g/l of serum, and in the 3rd month of gravidity (P < 0.01), at concentrations 1.36 +/- 0.38 g/l of serum. The determined decrease in their values in the mentioned period can be modulated by the mutually changing ratio of steroid hormones or by inhibition of synthesis of lipoproteins responsible for changes in total plasma lipids. Changes in cholesterol concentrations (Fig. 2, Tab. I) during the introduction of swabs were insignificant and ranged from 1.60 +/- 0.42 to 1.73 +/- 0.33 mmol/l of serum. An insignificant increase in cholesterol concentrations (P < 0.05), with its highest levels 1.98 +/- 0.43 mmol/l of serum, was recorded in the 3rd month of gravidity.(ABSTRACT TRUNCATED AT 250 WORDS)

• MeSH
• cholesterol krev   MeSH
• lipidy krev   MeSH
• ovce krev   MeSH
• progesteron krev   MeSH
• synchronizace říje krev   MeSH
• těhotenství u zvířat krev   MeSH
• těhotenství MeSH
• zvířata MeSH
• Check Tag
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• cholesterol MeSH
• lipidy MeSH
• progesteron MeSH

According to available literary data, an increased nuclear volume of endocrine gland cells, various structures of the diencephalon and endocrine ovarial structures could be observed when the respective organs and structures were more active; a decreased nuclear volume was revealed when the activity of the respective organ or its structure was suppressed (Mess, 1962; Maracek and Arendarcik, 1976, 1978). Attention was paid to the karyometric analysis of follicular cells of the stratum granulosum (SG) and secretory cells of the theca folliculi interna (TFI) during selection of the dominant ovulatory follicle (DOF). The aim of this study was to determine differences in hte nuclear volumes of the granulosa follicular cells and the secretory cells of the inner theca of the DO1F in comparison with the largest atretic follicles (AF) as well as to verify the use of karyometric variance analysis for the evaluation of the selection process of the dominant ovulatory tertiary follicle. Histological sections were prepared from large DOF and AF from the ovaries of 18 sheep aged 3-5 years and held under standard conditions of a controlled herd. Control group I (n = 3) consisted of Wallachian sheep on day 15 of the sexual cycle (day 0). Excisions of ovaries from the animals of the experimental group (n = 3) were made on day 16 of the cycle after i.m. treatment with 120 micrograms GnRH 10 and 7 hours prior to sampling. Control group II (n = 3) consisted of Tsigai sheep at the 9th or 10th day of the oestrous cycle (hour 0) and three experimental groups (n = 3 each) consisted of Tsigai sheep 24, 48 and 72 hours after i.m. treatment with 125 micrograms cloprostenol. After excision the ovaries were fixed in neutral formaline, cut into 4 mm thick transverse segments and subjected to standard histological processing. After staining with Harris' HE the 5-7 microns thick sections were karyometrically evaluated at a magnification of 2200 x according to the method of Palkovits (1961) using the PC programme Karyotest 03 (Maracek et al., 1991). 200 cells were evaluated from each sample and both cell types; altogether 7200 cells were examined. GnRH treatment (Dirigestran inj. Spofa) increased the nuclear volume of follicular cells (SG) in the dominant ovulatory follicle in the process of selection (Tab. I, Fig. 1). The former, however, reduced the nuclear volume not only of the SG follicular cells of LAF (Tab. II, Fig. 2) but also of the secretory cells of both the DOF and AF theca interna (Tab. II, Figs. 3, 4). Cloprostenol treatment (Oestrophan inj. Spofa) affected the follicular cells of the granulosa in the dominant ovulatory follicle.(ABSTRACT TRUNCATED AT 400 WORDS)

• MeSH
• folikulární atrézie MeSH
• folikulární buňky ultrastruktura   MeSH
• karyometrie * MeSH
• ovariální folikul fyziologie   ultrastruktura   MeSH
• ovce anatomie a histologie   MeSH
• thekální buňky ultrastruktura   MeSH
• zvířata MeSH
• Check Tag
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH

A postparturient period is characterized by low basal secretion of adenohypophysis gonadotropins with the following appropriate changes in ovarian hormones and their response to the morphology of vaginal epithelium. In this study the dynamics of the cytological picture of vaginal swabs and ovarian hormones 17 beta-oestradiol (E2) and progesterone was investigated in the puerpery of ewes. The objective was to obtain and extend the knowledge of cytological changes in vaginal epithelium and levels of ovarian hormones of ewes after parturition and of their relationships from the first several days after lambing until the 51st day of the period of observation. Vaginal swabs for vaginal cytology were taken from nine ewes on days 1, 4, 7, 14, 17, 21, 25, 34, 42 and 51 after parturition. These swabs were fixed in ether-alcohol 1:1, stained according to the Faltínová-Zidovský method, embedded in Canada balsam and evaluated by differentiation of cells according to Luksh (1953). Blood samples for E2 and P4 determinations were taken from the jugular vein in the same intervals as vaginal swabs. The serum was centrifuged and stored at -18 degrees C until use. E2 and P4 concentrations were determined radioimmunologically, using kits RIA-test ESTRA and RIA-test PROG from URVJT Kosice. A statistically significant decline (P < 0.05) of percentual representation of basal and parabasal cells (Fig. 1, Tab. I) on day 7 after lambing was replaced by their multiplication from day 14 reaching the values of 66.07 +/- 3.95 on day 42. A statistically significant decrease in intermediary flat cells (Fig. 2, Tab. II) was observed on days 14 (P < 0.001), 34 and 42 (P < 0.01; P < 0.001), in comparison with the first day after lambing. An evaluation of intermediary convoluted cells revealed their highest percentage on days 1 and 17 after parturition (34.65 +/- 4.77-20.62 +/- 12.57) and their decline to values in the range of 6.77 +/- 1.46-7.66 +/- 2.25 on the remaining days of the period of observation. Percent occurrence of superficial flat cells (Fig. 3, Tab. I) ranged from 3.9 +/- 1.10 to 10.63 +/- 7.23 from day 1 to day 51 after lambing. The lowest percentual representation (1.32 +/- 0.79-4.10 +/- 1.89) was recorded for superficial convoluted cells. Multiplication of the evaluated cells was observed, reaching the highest but insignificant representation (P > 0.05) on day 25 of postparturient investigation: 4.10 +/- 1.89 (Fig. 3, Tab. I). 17 beta-oestradiol (E2) concentrations were compared to the -1st day before parturition, when its values varied at the level of 2.45 +/- 0.64 nmol/l serum.(ABSTRACT TRUNCATED AT 400 WORDS)

• MeSH
• estradiol krev   MeSH
• ovce anatomie a histologie   krev   MeSH
• poporodní období * MeSH
• progesteron krev   MeSH
• vagina cytologie   MeSH
• vaginální stěr veterinární   MeSH
• zvířata MeSH
• Check Tag
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• estradiol MeSH
• progesteron MeSH

Application of new procedures in the sphere of the control of sexual functions requires an extension of present knowledge of postparturient endocrinium or endogenic factors comprised in postparturient physiology of sexual activity. According to recent data, oxytocin, besides its uterotonic and luteolytic activity, acts as an ovarian factor in the local intrafollicular regulation of stereidogenesis and as a modulator of uterine secretion of prostaglandines. Based on present knowledge of oxytocin effects, this study was aimed at investigation of the influence of repeated carbetocin (Depotocin inj. Spofa) administration on the dynamics of changes in thyroxine (T4), triiodothyronine (T3), 17 beta-estradiol (E2), progesterone (P4) concentrations and their mutual correlations from the 36th hour till the 51st day after parturition. Simultaneous study of a possible delayed influence of applied carbetocin on conception of ewes after oestrus evocation on day 51 after lambing was carried out. Nineteen ewes of the Slovak Merino breed, lambed in the first decade of February, were assigned to the experimental (n = 9) and to the control group (n = 10). Experimental ewes were subjected to repeated postparturient carbetocin treatment at the dose 0.07 mg per animal. The first dose was applied i. m. in 24 hours, and the second in 72 hours after parturition. On day 51 oestrus was induced in nine ewes of each group by combined treatment with chlorsuperlutin (Agelin, vaginal pessaries, Spofa) and PMSG (500 I.U./animal). On the day of PMSG application ewes were housed together with rams for the period of the next six days. Samples of blood were taken 24 hours before parturition (-1st day), up to 36 h after parturition and on days 4, 7, 14, 17, 21, 25, 34, 42 and 51 after parturition. Concentrations of T4, T3, E2 and P4 were determined by commercial kits RIA-test-T4; RIA-test-T3; RIA-test-ESTRA and RIA-test-PROG (URVJT Kosice). Animal of the control group showed variations of T4 concentrations (Tab. I, Fig. 1) at the level of original values (59.4 +/- 9.69 nmol.l-1) up to the 21st day with the exception of temporary drop on day 4 and rise on day 7, insignificant compared to the -1st day. T4 concentrations of the control group displayed an intermittent increasing trend with the statistically insignificant peak after 36 h and on day 17, compared to the -1st day. After the 21st day controls revealed a sustained moderate increase while the experimental ewes displayed a decline of its concentrations until the 51st day.(ABSTRACT TRUNCATED AT 400 WORDS)

• MeSH
• estradiol krev   MeSH
• fertilizace účinky léků   MeSH
• hormony krev   MeSH
• léky s prodlouženým účinkem MeSH
• ovce krev   MeSH
• oxytocin aplikace a dávkování   analogy a deriváty   farmakologie   MeSH
• poporodní období * MeSH
• progesteron krev   MeSH
• těhotenství MeSH
• thyroxin krev   MeSH
• trijodthyronin krev   MeSH
• uterotonika aplikace a dávkování   farmakologie   MeSH
• zvířata MeSH
• Check Tag
• těhotenství MeSH
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• carbetocin MeSH Prohlížeč
• estradiol MeSH
• hormony MeSH
• léky s prodlouženým účinkem MeSH
• oxytocin MeSH
• progesteron MeSH
• thyroxin MeSH
• trijodthyronin MeSH
• uterotonika MeSH

Postparturient anoestry, spontaneously changing over to seasonal anoestry, represents an important reserve of full utilization of the reproductive potential of sheep. In spite of the fact that the length of gestation in sheep only amounts to 148 days (+/- 5 days), inability of most sheep to enter the cycle during the spring season acts as a factor limiting the number of lambings--and at the same time production of lambs--to one lambing per year. In order to obtain more detailed knowledge of hormonal conditions in sheep puerpery, the presented work was directed at the study of dynamic changes in concentrations of thyroxine (T4), triiodothyronine (T3), 17 beta-estradiol (E2), progesterone (P4) and cholesterol (Chol) in the blood serum of ewes and at their mutual correlative dependences between the 36th hour and the 51st postparturient day. The observation was carried out in nine nursing ewes of the Slovak Merino breed, with average weight 40-50 kg, lambed in January and February. Blood was sampled by means of jugular vein puncture 14 days (-14th day) before parturition (a. p.), up to 36 h after parturition (p. p.) and on day 4, 7, 14, 17, 21, 25, 34, 42 and 51 p. p. In the period from the 36th h to day 21 p. p., concentrations of T4 (Tab. I, Fig. 1) showed a decreasing tendency compared to the starting -14th day (69.55 +/- +/- 0.12 nmol.-1) with the exception of a temporary increase on the 7th day p. p. The lowest values were recorded on days 4 and 21 p. p. (45.66 +/- 21.61 nmol.l-1, P less than 0.05 and 54.89 +/- 11.06 nmol.l-1, P less than 0.05, resp.). An increase of these values to the starting level was observed between days 25 and 51 p. p. Compared to the values on -14th day (0.76 +/- 0.22 nmol.l-1), a significant increase of T3 concentrations (Tab. I, Fig. 2) was recorded at the 36th h and on days 4 and 7 p. p. with the highest values (1.48 +/- +/- 0.34 nmol.l-1, P less than 0.001) at 36 h p. p. After the temporary decrease between days 14 and 21 p. p. its concentrations showed a constantly rising tendency statistically significant on days 34, 42 and 51 p. p., compared to the -14th day (P less than 0.05). Concentrations of E2 (Tab. I, Fig. 3) reached the values of 0.44 +/- 0.41 nmol.l-1 on the -14th day.(ABSTRACT TRUNCATED AT 400 WORDS)

• MeSH
• cholesterol krev   MeSH
• estradiol krev   MeSH
• hormony štítné žlázy krev   MeSH
• hormony krev   MeSH
• ovce krev   MeSH
• poporodní období krev   MeSH
• progesteron krev   MeSH
• zvířata MeSH
• Check Tag
• ženské pohlaví MeSH
• zvířata MeSH
• Publikační typ
• anglický abstrakt MeSH
• časopisecké články MeSH
• Názvy látek
• cholesterol MeSH
• estradiol MeSH
• hormony štítné žlázy MeSH
• hormony MeSH
• progesteron MeSH