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  1. Effects of sex, litter size and periconceptional ewe nutrition on the ewe-lamb bond

    Contributor(s):: Hernandez, C. E., Matthews, L. R., Oliver, M. H., Bloomfield, F. H., Harding, J. E.

    Undernutrition restricted to the time around conception in sheep alters endocrine and metabolic responses in the offspring. Studies in rats suggest that such an early insult can also alter the behaviour of the offspring. We studied the effects of mild maternal periconceptional undernutrition...

  2. Social dominance of female goats affects their response to the male effect

    Contributor(s):: Alvarez, L., Martin, G. B., Galindo, F., Zarco, L. A.

    The aim of this study was to assess the influence of social rank of anestrous goats on their interval to ovulation after exposure to males. Forty-five adult females were observed before and after the introduction of males to their pen. Behavioural sampling was used in both periods to record...

  3. Mating competency of rams and flock fertility

    Contributor(s):: Winfield, C. G., Cahill, L. P.

    The mating performance of 4 Corriedale rams with low mating competency (ratio of mounts to services approx. 12:1) were compared with those of 4 rams with high mating competency (ratio approx. 2:1) when they were mated for 8 days in single-sire flocks at a ram:ewe ratio of 1:90. The 2 groups of...

  4. The accuracy of several aids in detecting oestrus in dairy cattle

    Contributor(s):: Fulkerson, W. J., Sawyer, G. J., Crothers, I.

    The accuracy and efficiency of oestrus detection using behavioural observations, hormone-treated steers or tail paint, or behavioural observations in combination with hormone-treated steers or tail paint was assessed using 120 Friesian cows. The oestrus detection rate for cows in these 5 groups...

  5. The importance of the courting behaviour of the boar on the success of natural and artificial matings

    Contributor(s):: Hemsworth, P. H., Beilharz, R. G., Brown, W. J.

    Two studies were carried out at a commercial piggery. In the 1st study, the sexual behaviour of 24 boars of known breeding performance was observed. There was a correlation between the number of times the boar nosed the sides of the female and the CR achieved (0.48, P

  6. Social dominance of female dairy goats and response to oestrous synchronisation and superovulatory treatments

    Contributor(s):: Ungerfeld, R., Gonzalez-Pensado, S., Dago, A. L., Vilarino, M., Menchaca, A.

    Two experiments were performed to determine if there is a relation between the goat's hierarchical position, and (1) the conception rate and litter size obtained with hormonal oestrous synchronisation treatments and fixed timed artificial insemination, and (2) the number of corpus luteum (CL) and...

  7. High-ranking mares of captive plains zebra Equus burchelli have greater reproductive success than low-ranking mares

    Contributor(s):: Pluhacek, J., Bartos, L., Culik, L.

    Plains zebra live in harems that include one to six adult mares. Between these mares is a strong order of social hierarchy. The social rank of an equid mare is typically correlated with her age. Further, high-ranking captive plains zebra mares produce more surviving offspring than low-ranking...

  8. The influence of handling by humans on the behaviour, reproduction and corticosteroids of male and female pigs

    Contributor(s):: Hemsworth, P. H., Barnett, J. L., Hansen, C.

    The influence of three handling treatments was studied in 15 male and 30 female pigs. Two handling treatments, considered as pleasant and unpleasant, were imposed for 5 min, three times a week from 11 weeks of age. The third handling treatment involved minimal contact with humans from 11 weeks of...

  9. The influence of the human-animal relationship on the productivity and welfare of the pig

    Contributor(s):: Hemsworth, P. H., Barnett, J. L., Cronin, G. M.

    The effects of "unpleasant", control (minimal contact with humans), and "pleasant" handling of boars and gilts from 11 wk of age were studied. Boars in the pleasant handling group attained a fully coordinated mating response at an earlier age and had larger testes at 160 days of age than those in...