Wyniki wyszukiwania

1

Factors affecting expression of estrus in dairy cows with high milk yields

100%

Gavelis A., Zilaitis V., Juozaitis A., Juozaitiene V., Palubinskas G., Yilmaz A.

Medycyna Weterynaryjna

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2018

|

tom 74

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nr 12

The objectives of this study were to define the effect of the milk progesterone (P4) concentration on estrus expression in dairy cows with high milk yield and to identify the effect of milk yield and parity on the milk P4 concentration and cow’s pregnancy after artificial insemination (AI). In this study, 48 clinically healthy cows without reproduction disorders, on day 90-100 after calving were used. At the beginning of estrus and 12 hours after the beginning of estrus, the milk P4 concentration in dairy cows with high milk yield (group 3) was higher than in group 2 (33.66; 22.36%) and in group 1 (51.60; 65.26%) (P < 0.001). The milk P4 concentration in the ≥ 3 lactation cows was higher than the second (13.45%; P > 0.05) and the first (28.28%; P < 0.01) lactation ones (28.28%; P < 0.01). The milk P4 concentration at the beginning of estrus and 12 hours after the beginning of estrus in pregnant and non-pregnant cows was 2.58 and 3.32; 4.20 and 5.00 ng/ml, respectively (P < 0.001). As a result, it was concluded that high progesterone concentration affected the expression of estrus and pregnancy results in dairy cows, and the measuring of progesterone concentration in milk can be used as a non-invasive method to provide detailed information about fertility in high milk yield cows.

2

Correlations between social context and fecal glucocorticoid metabolite concentrations in free-ranging female gray-cheeked mangabeys (Lophocebus albigena) in Kibale National Park, Uganda

84%

Arlet M. E., Molleman F., Isbell L. A., Chancellor R. L., Carey J. R., Mand R.

Folia Biologica

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2013

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tom 61

|

nr 3-4

3

Sexual activity of different gilt genotype groups of the Pulawska breed during oestrus

84%

Babicz M., Pastwa M., Skrzypczak E., Luszczewska-Sierakowska I., Wawrzyniak A.

Medycyna Weterynaryjna

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2019

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tom 75

|

nr 01

The aim of the study was to analyze sexual activities of gilts representing various genotype groups in the RBP4 and MC4R locus. Observations of gilt behaviour during the first and the second oestrus (before initiation of the reproduction phase) were carried out in the Pulawska breed from conservation breeding. The evaluation process comprised the duration of the heat as well as the intensity of heat behaviours. Polymorphism identification in RBP4 (SNP: rs55618789) and MC4R (SNP: rs81219178) genes was performed, which resulted in the identification of three (MC4R: AA, AG and GG) and two (RBP4: CC and CT) gilt genotype groups. Significantly varying sexual activities were observed: the most intensive heat symptoms were demonstrated by CT gilts in the course of the first (P ≤ 0.05) and second (P ≤ 0.01) oestrus (locus RBP4) reaching, on average, 2.15 ± 0.13 and 2.52 ± 0.13 pt. It was further determined that the heats of CT gilts lasted longer and this difference, in the second heat, was significant (P ≤ 0.01). In the case of the MC4R locus, significant differences in gilt sexual activities were observed only in the course of the second oestrus (P ≤ 0.05). In addition, a strong association was also demonstrated of AA (locus MC4R) and CC (locus RBP4) genotypes with the thickness of the subcutaneous fat tissue (P ≤ 0.05) amounting in these gilts to 11.57 ± 0.21 mm and 11.50 ± 0.19 mm, respectively.

4

The impact of zearalenone on the level of the selected estrogens in blood serum of sexually immature gilts

84%

Zwierzchowski W., Obremski K., Zielonka L., Skorska-Wyszynska E., Gajecka M., Jakimiuk E., Polak M., Jana B., Rybarczyk L., Gajecki M.

Polish Journal of Veterinary Sciences

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2006

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tom 09

|

nr 4

The aim of the study was to evaluate the influence of low dose (LOEL - lowest observed effect level) of zearalenone (200 μg/kg b.w.), applied per os for 7 days (short-term intoxication), on sexual behavior, concentration of the examined xenobiotic and its metabolite and selected estrogens in sexually immature gilts: ovariohysterectomised (group Dl) and intact (group D2) animals. Clinical signs of oestrus (reddening, oedema and hyperaemia of the vulva and serorhoea from the reproductive tract - lack of standing reflex) were obserwed in group Dl on day 6 and in group D2 on day 4 of the experiment. Laboratory analyses of blood plasma were carried out determine the presence of zearalenone and a-zearalenole. They revealed an increase in the level of a-zearalenol before the oestrus, decrease in total amount of both examined substances on day when the oestrus appeared and increase in the level of both examined xenobiotics in the post oestrus period together with the higher share of zearalenone. Medium concentrations of estrone and estradiol within the borders of method determination in the majority of periods examined. Higher levels of estrone (32.0 pg/ml) were found on day 4, in the group D2 and estradiol (6.5 pg/ml) on day 6 in the D2 group. The presents study revealed that zearalenone applied per os at LOEL dose causes the incidence of apparent sexual readiness (without standing reflex) in sexually immature gilts with the somatically immature reproductive system.

5

Stimulation of ovulation rate in ewes by continuous oxytocin administration during oestrus

84%

Bobowiec R., Kosior-Korzecka U., Wojcik M., Martelli F., Sighieri C., Patkowski K.

Acta Scientiarum Polonorum. Medicina Veterinaria

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2003

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tom 02

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nr 2

6

Effect of glucose supplemented diet on natural and gonadotropin induced puberty attainment in gilts

84%

Ziecik A. J., Kapelanski W., Zaleska M., Rioperez J.

Journal of Animal and Feed Sciences

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2002

|

tom 11

|

nr 3

7

Synchronization of oestrus in Hamdani ewes: the use of different PMSG doses

84%

Timurkan H., Yildiz H.

Bulletin of the Veterinary Institute in Puławy

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2005

|

tom 49

|

nr 3

8

Wplyw prostaglandyn E2 i F2a na przeplyw krwi przez narzad rodny swini w przebiegu cyklu rujowego

67%

Dynarowicz I., Paprocki M.

Acta Academiae Agriculturae ac Technicae Olstenensis. Veterinaria

|

1992

|

tom 20

229-238

Izolowane narządy rodne loch (100—130 kg m.c/szt.) perfundowano krwią własną zwierząt lub płynem Krebsa-Henseleita. Przy stałym ciśnieniu 100 mm Hg badano wpływ prostaglandyn (PG) E2 i F2α na wielkość przepływów przez tętnice maciczną (ua) i jajnikową (oa) w 1.—2., 13.—14. i 16.—18. dniu cyklu rujowego. Równolegle z pomiarami przepływów kontrolowano stan napięcia myometrium. PGE2 w dawkach równych lub > 0,5 μg podawanych do oa, a w dawkach równych lub > 1,0 μg stosowanych do ua wywołuje nieistotne zmniejszenie, a następnie istotny wzrost przepływów zarówno krwi, jak i płynu fizjologicznego w badanych fazach cyklu. Czas trwania reakcji podczas perfuzji krwią był dłuższy w fazie lutealnej niż w pozostałych fazach. PGF2α, w dawkach równych lub > 0,25 μg podawanych do oa, а w dawkach równych lub > 0,5 μg stosowanych do ua zmniejsza przepływ krwi przez badane naczynia, z wyjątkiem 1.—2. dnia cyklu, w którym notowano wzrost przepływu w oa. PGF2α zwiększa przepływ w ua i oa w trakcie perfuzji płynem fizjologicznym we wszystkich fazach cyklu. Reakcjom zmniejszenia przepływu krwi bezpośrednio po podaniu PGE2 i PGF2α towarzyszy wzrost napięcia mięśni gładkich narządu rodnego.

9

Relation between clinical lameness and reproductive performance in dairy cows

67%

Olechnowicz J., Jaskowski J.

Medycyna Weterynaryjna

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2011

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tom 67

|

nr 01

Lameness of cows is an important factor influencing the longevity and performance of the herd, including milk yield losses. It has a negative impact on reproductive performance and constitutes an increasing risk for early culling. Claw disorders, such as white line diseases, sole ulcers or papillomatous digital dermatitis, are the most frequent causes of clinical lameness in dairy cows. Lameness most often appears within 100 days postpartum, and its incidence was calculated at 54.5 to 65% per 100 cows, whereas the mean prevalence of lameness has been estimated at 20.6%. Lame cows exhibit different oestrus behavior than non-lame cows. Above all, lame cows had a shorter oestrus, and an increased locomotion score was associated with a shorter time of standing and walking as a consequence of a longer time of lying down. A poor oestrus detection rate is likely to be a more important factor in reducing average fertility levels. Hence, the average conception rate and pregnancy rate for lame cows are lower, and the rates of services per conception are higher. Lame cows have a longer interval from calving to conception compared with non-lame cows. In the case of lame cows with lesions and multiple lesions this interval amounted to 140 and 170 days, respectively, as compared with 100 days for healthy cows. Ovarian cysts are observed in about 10-30% of lactating dairy cows and are more likely to occur within the first 80 days postpartum, i.e. during the same period when hoof disorders and lameness occur. Lameness in cows within the first 30 days postpartum was associated with a higher incidence of ovarian cysts, a lower likelihood of pregnancy and lower fertility than in non-lame cows. The effect of lameness on culling within the first 60 DIM was lower, but cows diagnosed in this period seemed to be at a greater risk of being culled between 121 and 240 DIM. Nevertheless, when deciding whether to cull a cow, one should consider such factors as parity, lactation stage, milk yield, reproductive performance, health, season and animal welfare.

10

Wplyw czynnikow pogodowych na wystepowanie rui u krow

67%

Janowski T. M., Zawora T., Cenckiewicz-Kierzyk E.

Acta Agraria et Silvestria. Series Zootechnica

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1995

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tom 33

41-48

11

Functional genome research in reproductive biology and biotechnology - a minireview

67%

Wolf E., Bauersachs S.

Animal Science Papers and Reports

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2010

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tom 28

|

nr 2

Female infertility is an increasingly important problem in cattle, causing enormous costs and retarding genetic progress. Current attempts to improve fertility by genetic selection are inefficient due to the low heritability of the respective trait, i.e. the nonreturn-rate 90 days after first sernice (NRR 90). Thus novel phenotypic traits more closely related to fertility are urgently needed.Since a large proportion of pregnancy losses occur in the preimplantation period, the interaction between early embryos and their maternal environment is an attractive target for systematic investigations, which may uncover mechanisms underlying early embryonic death. Based on holistic transcriptome and proteome studies [Hiendleder et al. 2005, Wolf et al. 2006] we attempt to understand the quantitative biology of embryo maternal communication and the regulation of endometrial receptivity [Wolf et al. 2003]. A short-term goal is the development of array-based systems for the differential diagnosis of fertility problems and for evaluating the connection between metabolic disturbances and reproductive functions. A long-term goal is the identification of genetic variation affecting the fertility-related gene expression profiles in female reproductive tissues such as endometrium. The endometrium undergoes marked functional changes during estrous cycle and pregnancy. As the adjacent environment of the conceptus, it represents the maternal interface for embryo maternal communication, which is essential to maintain pregnancy. Transcriptome studiem provide the unique opportunity to assess molecular profiles changing in response to endocrine or metabolic stimuli or to embryonic pregnancy recognition signals [reviewed in Bauersachs et al. 2008, Spencer et al. 2008].

12

Development of ovarian follicles, quality of oocytes and fertility of cows in view of a negative energy balance in the transition period

67%

Wlodarek J., Jaskowski J., Nowak W., Mikula J., Olechnowicz J.

Medycyna Weterynaryjna

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2011

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tom 67

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nr 04

Energy metabolism in cows during the first three weeks after calving has a decisive effect on the incidence of the first estrus postpartum, the length of the voluntary waiting period and interpregnancy period. Additionally, the negative energy balance (NEB) is usually promoted by the relatively one-sided selection of cows towards high production - accepting the occurrence of NEB after calving as well as excessive body condition of cows before calving. In case of a rapid body condition loss in cows after calving, connected with fat mobilization, characteristic of cows in excessive body condition during drying off, ovarian follicles are not properly formed. Disorders of the ovulation process as well as a lower secretion of progesterone are more frequently recorded in those cows. As a result of an energy deficit at the beginning of lactation, the frequency of GnRH pulses from the hypothalamus is lower in high-producing cows. A lack of pulsation secretion of LH as an effect of the prolonged lack of adaptation of a sufficient amount of energy to the needs of the female was found both in beef and dairy cows. The recurrence of LH pulses, stimulating the onset of ovarian activity and the pre-ovulatory development of ovarian follicles, is crucail to the return of cyclical activity in the postpartum period in cows suffering from NEB. An energy deficit causes the incidence of a dysfunction of the reproductive system in the form of persistent ovarian failure, a delayed onset of normal ovarian activity, and the appearance of the first corpus luteum postpartum. The number of estrus cycles occurring before effective insemination is also reduced and both the voluntary waiting period and interpregnancy period are longer. An energy deficit in the postpartum period results in disorders in the functioning of the endometrium. Disturbed energy-consuming processes of endometrium remodeling lead to delays in uterine involution. Reduced uterine contractility and changes in its environment constitute causes for the retention of the placenta and postpartum metritis; in cows with NEB it was a reduced mitogen response of lymphocytes to cytohaema gglutinin. Moreover, a reduced phagocytic activity of macrophages was found in the milk of cows, in which high contents of ketone compounds were found in their plasma. Similarly, the activity of lymphocytes and neutrophiles was reduced in the environment with an addition of β-hydroxybutyric and acetoacetic acids, as well as elevated PUFA levels and a reduced blood leptin concentration.

13

Zastosowanie hormonow gonadotropowych do stymulacji rui i owulacji u nutrii [Myocastor coypus M.]

67%

Szeleszczuk O., Jarosz S.

Acta Agraria et Silvestria. Series Zootechnica

|

1995

|

tom 33

103-109

14

Effect of synthetic GnRH analogues on ovarian follicular growth dynamic and oestrus

67%

Masiulis M., Zilinskas H., Rutkauskas A., Riskeviciene V.

Medycyna Weterynaryjna

|

2007

|

tom 63

|

nr 08

922-925

The aim of the present study was to evaluate the stimulating effect of synthetic GnRH analogues without the use of prostaglandins on ovarian follicular growth dynamic and oestrus. The study was made on 30, 3 to 9-year-old Lithuanian Black and White (LBW) and German Black and White (GBW) breed cows. The study was conducted in the Lithuanian Veterinary Academy practical training and research farm. Oestrus in 23 cows was stimulated using synthetic GnRH analogues Dalmarelin (Lecirelin) (Fatro S. p. A., Italy) and in 14 cows with the use of Depherelin® (Gonavet® 50, Veyx-Pharma GmbH, Germany). Dalmarelin (Lecirelin) induced oestrus in 100% of the stimulated cows, and Depherelin® (Gonavet® 50) induced oestrus in 92.9 % of stimulated cows. Following an injection of synthetic GnRH analogues, preparations Depherelin® and Dalmarelin, plasma progesterone concentration decreased, due to the ovulation of dominant follicle or onset of the new follicular wave. Cows stimulated with Dalmarelin had a faster follicular growth rate and bigger size of follicles at ovulation compared to Depherelin® and control group cows (p = 0.05). In the pregnancy trial that followed 45 days after artificial insemination, the highest percentage (43.5 %) of pregnant cows was determined in the group of cows stimulated with Dalmarelin.

15

Effect of single vs multiple ovulations on oestrous behaviour and pregnancy rate in Thoroughbred mares

67%

Gorecka A., Jezierski T.

Animal Science Papers and Reports

|

2003

|

tom 21

|

nr 1

A relatively high rate of multiple ovulation and resulting multiple pregnancies are one of main problems in Thoroughbred reproduction. The aim of the study was to examine the relationship between the intensity of oestrous behaviour and incidence of multiple (MO) vs single (SO) ovulations in 47 Thoroughbred mares. The frequency of five distinct receptive and 12 non-receptive behavioural traits was analysed. For quantitative analysis of sexual behaviour an 8-point behavioural score (BS) expressing increasing mare’s sexual receptivity was used. MO occurred in 48.9% of ovarian cycles observed. Neither frequencies of receptive behaviours, nor BS differed significantly between MO and SO mares. Overall pregnancy rate per one ovulatory cycle was estimated as 40.4%. Pregnancy rate was higher in MO mares (52.2%) as compared to SO mares (29.2%); however, the difference was not proved significant.

16

The influence of feeding level during lactation and from weaning to oestrus on body weight gain, fatness, reproductive performance and mammary gland health in sows

67%

Rekiel A., Kulisiewicz J., Bielecki W., Wiecek J.

Annals of Animal Science. Supplement

|

2003

|

nr 1

17

Double insemination of cows during one oestrus

67%

Jankowska M.

Electronic Journal of Polish Agricultural Universities. Series Animal Husbandry

|

2002

|

tom 05

|

nr 1

Data on insemination and reinsemination were collected from 1 643 Black and White (BW) cows with varied share of HolsteinFriesian (HF) genes, which belonged to the active population managed in five largescale production farms in the KujawskoPomorskie Province, Poland. A total number of 351 repeated inseminations were recorded, which amounted to 7.71% of all inseminations. The rates of nonreturn to oestrus after reinseminations were by 2.05% better in relation to single inseminations, however, an economical analysis led to a conclusion that double insemination does not produce economical benefits and can only be recommended in specific cases, e.g. with prolonged oestrus. Highly significant effect on nonreturn rates after inseminating once or twice was demonstrated for the factors of HF genes share, farm, milk yield, age at first calving, subsequent calving, and season of insemination.

18

Wykrywanie rui i ciazy u owiec na podstawie oporu elektrycznego sluzu pochwowego

59%

Szczepanski W., Milewski S., Brzostowski H., Tanski Z., Czarniawska-Zajac S.

Acta Academiae Agriculturae ac Technicae Olstenensis. Zootechnica

|

1994

|

tom 41

127-134

U 33 maciorek wieloródek określono opór elektryczny śluzu pochwowego za pomocą elektronicznego miernika firmy Dramiński. Wykonano 4 pomiary w okresie cyklu rujowego, bezpośrednio po stwierdzeniu występowania rui przez tryka szukarka, a następnie w 12, 24 i 36 godzin od I tego momentu oraz 5 pomiarów po pokryciu maciorek: w 17., 34., 85., 102. i 136. dniu. Stwierdzono pełną przydatność tej metody do wykrywania rui, pozwalającą na jej zastosowanie w przypadku braku szukarków. Używając jej do diagnozowania ciąży w 17., 34., 85. i 102. dniu po pokryciu uzyskano odpowiednio: 69.70%, 78.79%, 63.63% i 57.58% zgodności z faktycznymi rezultatami wykotów

19

Rozrod bydla

59%

Pasko J.

Biuletyn Informacyjno-Handlowy. Ośrodek Doradztwa Rolniczego Boguchwała

|

1997

|

nr 11

10-12

20

Współczesne techniki w rozrodzie

59%

Witkowski M.

Araby

|

2006

|

nr 1(1)

Ograniczanie wyników

Factors affecting expression of estrus in dairy cows with high milk yields

Correlations between social context and fecal glucocorticoid metabolite concentrations in free-ranging female gray-cheeked mangabeys (Lophocebus albigena) in Kibale National Park, Uganda

Sexual activity of different gilt genotype groups of the Pulawska breed during oestrus

The impact of zearalenone on the level of the selected estrogens in blood serum of sexually immature gilts

Stimulation of ovulation rate in ewes by continuous oxytocin administration during oestrus

Effect of glucose supplemented diet on natural and gonadotropin induced puberty attainment in gilts

Synchronization of oestrus in Hamdani ewes: the use of different PMSG doses

Wplyw prostaglandyn E2 i F2a na przeplyw krwi przez narzad rodny swini w przebiegu cyklu rujowego

Relation between clinical lameness and reproductive performance in dairy cows

Wplyw czynnikow pogodowych na wystepowanie rui u krow

Functional genome research in reproductive biology and biotechnology - a minireview

Development of ovarian follicles, quality of oocytes and fertility of cows in view of a negative energy balance in the transition period

Zastosowanie hormonow gonadotropowych do stymulacji rui i owulacji u nutrii [Myocastor coypus M.]

Effect of synthetic GnRH analogues on ovarian follicular growth dynamic and oestrus

Effect of single vs multiple ovulations on oestrous behaviour and pregnancy rate in Thoroughbred mares

The influence of feeding level during lactation and from weaning to oestrus on body weight gain, fatness, reproductive performance and mammary gland health in sows

Double insemination of cows during one oestrus

Wykrywanie rui i ciazy u owiec na podstawie oporu elektrycznego sluzu pochwowego

Rozrod bydla

Współczesne techniki w rozrodzie