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  1. Sexual activities and oestrus detection in lactating Holstein cows

    Contributor(s):: Vliet, J. H. van, Eerdenburg, F. J. C. M. van

    During 6 weeks, the oestrous behaviour of all non-pregnant cows on 2 dairy farms was observed for periods of 30 min at 2 h intervals. Cows were housed in a free stall with cubicles and a concrete slatted floor. Pedometers were used to measure the physical activity of the cows throughout the...

  2. Social maturation and productivity in bighorn sheep: are young males incompetent?

    Contributor(s):: Shackleton, D. M.

    Two populations of bighorn sheep (Ovis canadensis canadensis) were studied; one was unhunted, and in the other the 3 oldest [male][male] were removed during the hunting season. One month later, the remaining 9 males (aged 2.5-7.5 yr) courted and successfully copulated with adult oestrous...

  3. The influence of factors associated with oestrus on the sexual "attractiveness" of ewes to rams

    Contributor(s):: Tilbrook, A. J.

    The influence on sexual attractiveness of ewes of the stage of oestrus of the ewes, the dose of oestradiol benzoate (ODB) used to induce oestrus, the oestrous state of the ewes, and the order that the ewes had been detected in oestrus were considered in 4 experiments. In the 1st experiment, 12...

  4. The sexual motivation of boars housed adjacent to ovariectomised gilts did not affect the efficiency of detecting hormonally induced oestrus using the back pressure test

    Contributor(s):: Turner, A. I., Hemsworth, P. H., Tilbrook, A. J.

    This study tested the hypothesis that the efficiency of detecting oestrus in gilts using the back pressure test will be lower when gilts are housed adjacent to a boar of high sexual motivation than when they are housed adjacent to a boar of low sexual motivation. The experiment was a 2 x 2 Latin...

  5. A review of some factors affecting the expression of libido in beef cattle, and individual bull and herd fertility

    Contributor(s):: Petherick, J. C.

    This paper examines some of the factors that affect the expression of libido in beef cattle, focusing on the male and the free-ranging situation. The ways in which bull libido is assessed and the relationship between libido test results and fertility are discussed. Genetics play a role in...

  6. Age-related changes in the sexual performance of Hereford bulls

    Contributor(s):: Price, E. O., Borgwardt, R.

    The sexual performance of 12 Hereford-poll bulls was tested yearly over a 4-year period (from 12-13 months to 5 years of age). Year effects were significant for ejaculation frequency, frequency of mounts without ejaculation and the proportion of mounts that culminated in an ejaculation. As...

  7. An investigation of the roles of boar-component stimuli in the expression of proceptivity in the female pig

    Contributor(s):: Pearce, G. P., Hughes, P. E.

    Combinations of the visual, auditory and/or olfactory cues from boars were presented to 60 Large White X Landrace sows as a choice in the arms of a T-maze. The relative attraction of the sows towards the combinations of stimuli was interpreted as showing that these stimuli elicited proceptive...

  8. Behavioral patterns of zebu bulls toward cows previously synchronized with prostaglandin F2 alpha

    Contributor(s):: Orihuela, A., Galina, C. S., Duchateau, A.

    With the objective of comparing the behaviour of synchronized cows in the presence or absence of a bull, 30 Indo-Brazilian cows with a mature corpus luteum, identified by rectal palpation, were injected with 25 mg PGF2 alpha at about day 8 of the cycle for 3 consecutive cycles. Immediately after...

  9. Behavioral responses of bulls kept under artificial breeding conditions to compounds presented for olfaction, taste or with topical nasal application

    Contributor(s):: Presicce, G. A., Brockett, C. C., Cheng, T., Foote, R. H., Rivard, G. F., Klemm, W. R.

    The object of this study was to test practical ways of influencing behaviour of bulls used for artificial insemination. Dairy bulls that were sexually active with regular semen collections were compared with sexually inactive bulls housed elsewhere, after being sampled in artificial breeding as...

  10. Behavioural patterns of zebu bulls towards females synchronised with PGF<sub>2 alpha </sub>; or oestrogens under corral and field conditions

    Contributor(s):: Piccinali, R., Galina, C. S., Navarro-Fierro, R.

    32 zebu bulls were tested to determine their behavioural patterns towards 5 cows previously synchronized with PGF2 alpha or oestrogens. Animals were tested 8 times at intervals of 20 days, for 15 min each time, in a corral (7 x 15 m) and given a score for sexual behaviour (0 = no sexual...

  11. Behavioural response to mixing of entire bulls, vasectomised bulls and steers

    Contributor(s):: Mohan Raj, A. B., Moss, B. W., McCaughey, W. J., McLauchlan, W., Kilpatrick, D. J., McGaughey, S. J.

    Four groups of cattle each consisting of 2 entire bulls, 2 vasectomized bulls and 2 steers, were created by mixing the constituent animals together and their homosexual (teasing and mounting) and aggressive (butting and pushing) behaviours were investigated in detail for the initial 4-h period....

  12. Courtship and agonistic behavior in mouflon sheep

    Contributor(s):: McClelland, B. E.

    Two captive mixed-sex herds in west-central Texas were studied in large enclosures on game ranches during the autumn of 1980. Interactions consisted of 1 or more repeated postures (low stretching, twisting, foreleg kicking, sniffing, rearing, urinating, flehmen, mounting, horn threatening, chest...

  13. Early exposure to females affects interactions between male White Leghorn chickens

    Contributor(s):: Leonard, M. L., Zanette, L., Fairfull, W.

    To examine the effect of rearing condition on White Leghorn chickens interactions were observed between pairs comprising one male reared in an all-male group (single-sex) and one male reared with females (mixed-sex). Two males one from each treatment, were placed in a neutral arena with either a...

  14. Effects of sexual stimulation on the sexual performance of rams

    Contributor(s):: Price, E. O., Wallach, S. J. R., Dally, M. R.

    In the 1st of 2 experiments, 11 sexually experienced ram lambs (about 9 months of age) and 18 sexually experienced yearling and 2-yr-old rams were individually exposed to 4 unrestrained, hormone-induced oestrous ewes for 60 min. Before exposure to [female][female], the rams had been allowed or...

  15. Heterosexual experience differentially affects the expression of sexual behavior in 6- and 8-month-old ram lambs

    Contributor(s):: Price, E. O., Borgwardt, R., Dally, M. R.

    201 Targhee ram lambs (6 and 8 months of age) were individually exposed to 4 oestrous ewes for 30 minutes and their behaviour was observed. Rams were exposed to ewes on 4 occasions, 7 days apart. In addition, half of the rams in each age class (experimental rams) were exposed to 16 oestrous ewes...

  16. Identification of sexual receptivity in ewes by young sexually inexperienced rams

    Contributor(s):: Orgeur, P.

    The roles of both sexual partners during the phase of mutual recognition before copulation was studied. Inexperienced Ile-de-France rams, aged 14-15 months, were observed individually in the presence of 2 ewes (1 sexually receptive and 1 non-receptive) for three 1-h periods at weekly intervals....

  17. Individual differences among mature boars in T-maze preference for estrous or non-estrous sows

    Contributor(s):: McGlone, J. J., Morrow, J. L.

    The preference of 11 mature boars for oestrous or non-oestrous sows was tested using a T-maze in experiment 1. The time boars spent near 4 sets of oestrous and non-oestrous sows was recorded during 5-min tests. Yorkshire, Duroc, Landrace and Hampshire boars were tested in a random order on each...

  18. Intrauterine position effects in female swine: subsequent reproductive performance, and social and sexual behavior

    Contributor(s):: Parfet, K. A. P., Ganjam, V. K., Lamberson, W. R., Rieke, A. R., Saal, F. S. vom, Day, B. N.

    The sex of adjacent fetuses has been shown to affect the subsequent behaviour and reproductive performance of rodents. In the present study, sows were slaughtered at day 112 of gestation, and piglets were delivered manually. The piglets' uterine position was recorded as between 2 [female][female]...

  19. Male llama choice between receptive and nonreceptive females

    Contributor(s):: Lichtenwalner, A. B., Woods, G. L., Weber, J. A.

    Male llamas were allowed indirect (9 males, 3 trials; n = 27) or direct (7 males, 1 trial) contact with a receptive and a non-receptive female. In the indirect contact test, males were allowed 15 min to choose between a receptive and a non-receptive female by means of visual, auditory and...

  20. Male rank order, space use and female attachment in large flocks of laying hens

    Contributor(s):: Oden, K., Berg, C., Gunnarsson, S., Algers, B.

    In a flock of 3500 modern laying hens with males present at an average ratio of 1:190 females and a density of 7 birds/m2, male dominance, space use and eventual female attachment were studied by direct observations of the males and a total of 232 female focal birds. Territorial, sexual and...