Search Results - "de Jonge, Francien H."

On the rewarding nature of appetitive feeding behaviour in pigs ( Sus scrofa): Do domesticated pigs contrafreeload? by de Jonge, Francien H., Tilly, Sarah-Lee, Baars, Annemarie M., Spruijt, Berry M.

“…Contrafreeloading is the phenomenon that animals prefer to “work” for food even though “free” food is available nearby. In this study, we investigated whether…”
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Music during play-time: Using context conditioning as a tool to improve welfare in piglets by de Jonge, Francien H., Boleij, Hetty, Baars, Annemarie M., Dudink, Suzan, Spruijt, Berry M.

“…In this experiment, we investigated whether music can facilitate play behaviour in piglets after weaning, when that music had been presented preweaning as a…”
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Are pigs sensitive to variability in food rewards? by de Jonge, Francien H., Ooms, Monique, Kuurman, Willem W., Maes, Joseph H.R., Spruijt, Berry M.

“…Pigs are non-specialist feeders with high capacities to adapt their diets within wide limits to prevailing and unpredictable conditions. Under husbandry…”
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Domestication effects on foraging strategies in pigs ( Sus scrofa) by Gustafsson, Maria, Jensen, Per, de Jonge, Francien H, Schuurman, Teun

“…It has been suggested that domestic animals have lost the ability to respond to environmental changes in an adaptive fashion. Others have suggested that during…”
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Announcing the arrival of enrichment increases play behaviour and reduces weaning-stress-induced behaviours of piglets directly after weaning by Dudink, Suzan, Simonse, Helma, Marks, Inge, de Jonge, Francien H., Spruijt, Berry M.

“…Piglets have difficulties with the abrupt changes at weaning associated with conventional pig production systems. Previously, it has been shown in rats that…”
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Attractivity of male and female rats after early endocrine manipulation by De Jonge, F H, Meyerson, B J

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Rearing piglets in a poor environment : Developmental aspects of social stress in pigs by DE JONGE, F. H, BOKKERS, E. A. M, SCHOUTEN, W. G. P, HELMOND, F. A

“…Effects of rearing conditions on the development of social relationships were investigated in female pigs. For that purpose, one group of piglets was reared in…”
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Maternal behaviour of domestic sows and crosses between domestic sows and wild boar by Gustafsson, Maria, Jensen, Per, de Jonge, Francien H., Illmann, Gudrun, Spinka, Marek

“…We compared maternal behaviour in domestic sows and wild boar crosses (wild-type sows) to assess whether pre-parturient behaviour and/or the ability to care…”
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Rearing piglets in a poor environment: Developmental aspects of social stress in pigs by De Jonge, Francien H., Bokkers, E.A.M., Schouten, W.G.P., Helmond, F.A.

“…Effects of rearing conditions on the development of social relationships were investigated in female pigs. For that purpose, one group of piglets was reared in…”
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Conditioned place preference induced by sexual interaction in female rats by Oldenburger, W P, Everitt, B J, de Jonge, F H

“…The present study was undertaken to establish whether the conditioned place preference paradigm can be utilized to investigate and elucidate the neuroendocrine…”
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Sexual behavior and sexual orientation of the female rat after hormonal treatment during various stages of development by de Jonge, F H, Muntjewerff, J W, Louwerse, A L, van de Poll, N E

“…The amount of circulating sex steroids during Postnatal Days 30-90 was varied in normally developed and in androgenized female rats. The influence of these…”
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The influence of estrogen, testosterone and progesterone on partner preference, receptivity and proceptivity by de Jonge, F H, Eerland, E M, van de Poll, N E

“…The influence of Estradiol benzoate (EB), Testosterone propionate (TP) and Progesterone (P) on the female's partner preference for sexually active males was…”
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Androgens are specifically implicated in female rat sexual motivation. The influence of methyltrienelone (R1881) on sexual orientation by de Jonge, F H, Kalverdijk, E H, van de Poll, N E

“…The present experiment was designed to investigate whether androgens are specifically involved in the induction of a male-directed orientation in adult female…”
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Sex-specific interactions between aggressive and sexual behavior in the rat: effects of testosterone and progesterone by de Jonge, F H, Eerland, E M, van de Poll, N E

“…The influence of progesterone on sexual and aggressive behaviors during aggressive encounters was investigated in pairs of TP-treated male and female rats…”
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On the involvement of progesterone in sexually rewarded choice behavior of the female rat by de Jonge, F H, van de Poll, N E

“…The present experiment was designed to investigate the role of Progesterone in the regulation of two aspects of the female's appetitive sexual behavior…”
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Acute effects of sex steroids on lordosis behaviour of the female rat by de Jonge, F H, Burger, J, Van de Poll, N E

“…In the present series of experiments, dose-response and time-response relationships between single injections of sex steroids and the display of lordosis…”
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Variable mounting levels in the female rat: the influence of experience and acute effects of testosterone by de Jonge, F H, Burger, J, Van de Poll, N E

“…Ovariectomized female rats were tested for mounting behaviour along 4 different procedures in order to investigate which factors may contribute to the…”
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Attractivity of male and female rats which are hormonally manipulated during early development and in adulthood by de Jonge, F H, Meyerson, B J, van de Poll, N E

“…Attractivity is one aspect of female sexuality relevant for the understanding of male-female sexual interactions. In a previous study, it was shown that intact…”
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Book reviews by de Jonge, Francien H., Hampson, Elizabeth, Bosinski, Hartmut A. G.

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Sexual experience and preference for males or females in the female rat by de Jonge, F H, Burger, J, van Haaren, F, Overdijk, H, van de Poll, N E

“…The influence of sexual experience on preference behavior was investigated in adult female rats. In the first experiment, preference behavior for sexually…”
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