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1

Characterization and partial purification of mating pheromone excreted by mating type II cells of the ciliate Dileptus anser

100%
Parfenova E. V., Afon'kin S. Y., Yudin A. L., Etingof R. N.
Acta Protozoologica
|
1989
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tom 28
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nr 1
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Can sexual behaviour serve to identify species? An example of two slugs of the genus Deroceras

100%
Czyz M., Reise H., Hutchinson J.
Folia Malacologica
|
2012
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tom 20
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nr 1
3

Measuring of the postcopulatory departure in male rats

100%
Beck J.
Acta Neurobiologiae Experimentalis
|
1997
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tom 57
|
nr 3
4

Group structure and social behaviour of warthogs Phacochoerus aethiopicus

100%
Somers M. J., Rasa O. A. E., Penzhorn B. L.
Acta Theriologica
|
1995
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tom 40
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nr 3
Data are presented on aspects of the group structure anc! social behaviour of warthogs Phacochoerus aethiopicus (Pallas, 1767) in the Andries Vosloo Kudu Reserve (AVKR), Eastern Cape Province, South Africa. The social structure of warthogs is one of small groups, usually solitary males or bachelor groups, matriarchal groups consisting of adult females with juveniles and/or yearlings, or yearling groups. Mean group size was 2.21. Forty five percent of warthogs sighted were solitary. There was a seasonal variation in the mean group size. Differences in social interactions between various age and sex classes are described. Breeding of the warthogs in the AVKR was seasonal with the females coming into oestrus at the end of May and farrowing towards the end of November. The mating system is promiscuous with males roaming during the mating season, mating with numerous females, and females mating with more than one male. Non-offspring nursing occurred.
5

Effect of naloxone treatment on luteinizing hormone and testosterone concentrations in boars with high and low libido

84%
Estienne M. J., Harper A. F., Speight S. M., Crawford R. J., Barb C. R.
Reproductive Biology
|
2009
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tom 09
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nr 3
6

Can roosters’ head ornaments serve as a criterion for their selection as valuable reproducers?

84%
Lukaszewicz E., Baginska P., Lason M.
Annals of Animal Science
|
2017
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tom 17
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nr 3
7

Effect of the age of ganders on reproductive behavior and fertility in a competitive mating structure

84%
Gumulka M., Rozenboim I.
Annals of Animal Science
|
2017
|
tom 17
|
nr 3
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The influence of the breed and age on the libido of insemination boars

84%
Szostak B., Sarzynska J.
Acta Scientiarum Polonorum. Zootechnica
|
2011
|
tom 10
|
nr 3
The libido of a boar is a very important factor which determines the male’s suitability for insemination. Before a breeder is included in the semen production cycle, its libido has to be estimated, which may significantly contribute to the improvement of the organization of work in breeding stations.Many factors influence a boar’s libido.Among others, it is the male’s age and breed. In this work the influence of the breed and age on the sexual behaviour of boars is estimated, as well as the phenotype correlations between a boar’s libido and the parameters of the semen are defined. It has been proved that among the analysed breeds and hybrids the highest libido characterized PIC hybrids, and hybrids such as: Pietrain x Duroc and Duroc x Pietrain, and among the pure breed boars – Duroc breed. It has also been proved that the sexual activity of boars decreases with age. Significant correlations between a boar’s libido and some features of the semen have been shown.
9

Reproductive behaviour of free-ringing rural dogs in West Bengal, India

84%
Pal S. K.
Acta Theriologica
|
2003
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tom 48
|
nr 2
Reproductive behaviour of free-ranging dogs Canis familiaris Linnaeus, 1758 was studied in a village in the state of West Bengal, India. Increased synchronized breeding was the most striking feature of this study. October (late monsoon) represented the peak period of mating for the feral dogs. Of all courting males, only 41% were observed to mount and copulate. On average, each male mounted 5.47 ± 2.49 (mean ± SD) times per hour. Of all mountings, only 10% were successful matings, ie copulatory ties. There was a negative correlation between the number of courting males and the number of successful copulations. The average duration of copulatory tie was 15.73 ± 7.75 min. Several factors interrupting the duration of copulatory ties were identified. December was the peak period of pup rearing. Mean litter size was 5.70 ± 2.03 with a male-biased sex ratio 1.41:1. Only a single annual breeding cycle recorded here differed from the previous studies on European and American dogs. Mothers spent most of the time with their pups at the dens during the early stage of rearing. The duration of time spent at dens by mothers was minimum when the pups were highly mobile at the age of 10 weeks. The lactating mothers were observed to be more aggressive immediately following litter production. Typically, an old adult male remained near the den as a 'guard'.
10

Sexual experience affects behaviour of bank voles Clethrionomys glareolus

84%
Kapusta J., Marchlewska-Koj A., Olejniczak P.
Acta Theriologica
|
1994
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tom 39
|
nr 4
Behavioural activity of Clethrionomys glareolus (Schreber, 1780) is modified by social factors. Interaction between sexually nonexperienced (NExp) and experienced (Exp) animals was investigated. Males and females were tested in pairs in the male home cage during 10 min encounters. Aggressive and nonaggressive behaviour was recorded, and ultrasonic vocalization was monitored by a QMC ultrasound detector. The obtained results indicate that total activity of Exp females was significantly higher than NExp females (p < 0.05). Only females exhibited aggressive behaviour toward males, but there was no difference in aggressive activity related to sexual experience. Total activity of Exp males was higher than that of NExp ones (p < 0.05). Our previous results indicate that in adult bank voles only males produce ultrasounds. In these experiments significantly more calls was recorded when Exp males were tested and compared with NExp males (p < 0.05). This study provides additional information about interaction between breeding and non-breeding animals in a bank vole popu­lation.
11

Noninvasive monitoring of reproductive function by determination of faecal progestagens and sexual behaviour in a herd of Przewalski mares in a semireserve

84%
Scheibe K. M., Dehnhard M., Meyer H. H. D., Scheibe A.
Acta Theriologica
|
1999
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tom 44
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nr 4
We examined the reproductive activity and sexual behaviour of a herd of Przewalski mares Equus ferus przewalskii Poljakov, 1881 that were born in zoos and lived in a semireserve since 1992 during five periods in 1995-1997 of 4-6 weeks each Ovarian activity was detected by the analysis of faecal progestagens. In addition, behavioural detection of oestrus and continuous recording of the daily activity with a storage telemetry system were carried out and compared with the analytical data. Faecal 20a-hydroxypregnane analysis revealed ovarian activity to be 100% (April/May 1995), 25% (May/June 1996), 88% (October/November 1996), 63% (January/February 1997) and 100% (April/May 1997) of the mares sampled. Behavioural observations showed a seasonal pattern with maximal sexual interactions in April/May 1995/1997 and only few interactions in winter. Detailed activity records in individual animals revealed an oestrus related increase from 14 h/d to 15.6 h/d. Our results show a tendency of seasonality which support the view that Przewalski mares are seasonal breeders with sexual activity in spring and early summer. In May/June 1996 a dysregulation of reproductive activity associated with a persistent increase in locomotor activity occurred. We hypothesise external disturbances from a shooting yard close to the semireserve. Compared to behavioural observations, faecal progestagen analysis seem to be the most convenient method to investigate reproductive activity in free ranging Przewalski mares.
12

The role of nitric oxide in the hypothalamic control of LHRH and oxytocin release, sexual behavior and aging of the LHRH and oxytocin neurons

84%
Calka J.
Folia Histochemica et Cytobiologica
|
2006
|
tom 44
|
nr 1
13

The role of sexual reward in the temporal patterning of copulatory behaviour in male rats

84%
Beck J., Bialy M.
Acta Neurobiologiae Experimentalis
|
1993
|
tom 53
|
nr 3
14
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The role of self-regulation and life-optimism in sexual risk behaviour in university students from Hungary, Lithuania and Slovakia

67%
Kalina O., Orosova O., Kriaucioniene V., Lukacs A.
Health Problems of Civilization
|
2017
|
tom 11
|
nr 3
Background. Personality factors have frequently been found to be associated with health risky behaviours although the findings are not always consistent and are rare in Central or Eastern Europe. Holding optimistic beliefs was found as a protective factor as women at the highest risk for HIV demonstrated lower self-esteem, less optimistic and fatal views concerning the future. Similarly, high levels of dispositional self-regulation among students, decreased alcohol use, alcohol-related negative consequences and sexual risk-taking. This study aims to explore and compare the associations between self-regulation, life-optimism and sexual risk behaviour in young adults from Hungary, Lithuania and Slovakia. Material and methods. Online questionnaires concerning health- related behaviour including sexual behaviour, optimism and self-regulation were distributed to first year university students in Hungary (N=819, 66% females), Lithuania (N=928, 70% females) and Slovakia (N=807, 75% females). Multinomial logistic regression was performed in SPSS 16. Results. Selfregulation was associated with sexual risk behaviour as students with higher self-regulation were less likely to report high risk or moderate-risk sexual behaviour compared to those with lower self-regulation. Life optimism was not associated with any type of sexual risk behaviour. Conclusions. Taking into consideration our results on young adults as well as those conducted by others, we may see stability in self-regulation as a vital factor which may affect one’s sexual behaviour during adolescence and young adulthood. As for intervention or prevention programmes, enhancing self–regulation result in reduction of substance use and sexual risk behaviour. However, such intervention should be done in early adolescence.
15

Significance of the breeding season for autumnal nest-site selection by Tree Sparrows Passer montanus

67%
Pinowski J., Pinowska B., Barkowska M., Jerzak L., Zduniak P., Tryjanowski P.
Acta Ornithologica
|
2006
|
tom 41
|
nr 1
16

c-fos expression as a tool to search for the neurobiological base of the sexual behaviour of males

67%
Bialy M., Kaczmarek L.
Acta Neurobiologiae Experimentalis
|
1996
|
tom 56
|
nr 2
17

Effect of naked oats used for gilts on the state of their reproductive organs and selected reproductive indicators of sows

59%
Szostak B., Stasiak A., Bakowski M., Kanev D.
Annals of Warsaw University of Life Sciences - SGGW. Animal Science
|
2017
|
tom 56[2]
Effect of naked oats used for gilts on the state of their reproductive organs and selected reproductive indicators of sows. The study was carried out on 180 Polish Landrace gilts. The animals were assigned to three groups, two experimental and one control, with 60 individuals in each. The gilts were fed complete mixed rations in amounts consistent with the norms given in Swine Feeding Standards (1993).The mixture fed to the experimental groups contained 40% (D1) and 20% (D2) naked oats of the Akt variety. Sexual activity was observed in the gilts during the second and third oestrus. The standing reflex was tested twice a day, in the morning and afternoon, and its duration was determined by timing the positive reaction to a boar, to touch and to mounting. Half of the gilts, selected in equal numbers from the control group and the experimental groups, were slaughtered between days 5 and 10 of the luteal phase of the second or third oestrous cycle. The number of corpora lutea was determined in these gilts. The reproductive organs were evaluated as well, taking into account the weight of the uterus, the length of the uterine horns and the weight of the ovaries. The remaining gilts (90) were mated during the second (45 gilts) and third (45 gilts) oestrus. Then the age at first farrowing, the weaning-to-conception interval between the first and second and the second and third litters, and the length of the farrowing interval between the first and second and the second and third litters were calculated. The highest uterine weight was noted in the gilts from the experimental groups. In both periods the weight of the uterus ranged from 372.8 (D2, mated during the second oestrus) to 398.4 g (D1, mated during the third oestrus). The weight of the ovaries was within the normal range, but significant differences were noted between the experimental and control groups. The highest sexual activity during oestrus (2.4-2.7 pts) in the first, second and third reproductive cycles was observed in the sows that received naked oats in their feed ration. Gilts mated during the second oestrus of the first reproductive cycle had litters earliest, on average at the age of 314.7 days (group D1), compared to 335.3 days in the case of gilts bred in the third oestrus of the first reproductive cycle (group D1). The most beneficial farrowing interval in each reproductive cycle was noted in the groups of sows receiving mixtures containing naked oats.
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