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| Dijkman, E.H. van; Groeneveld, J.; Brat, L.C.; Kleijn, L.J.K.; Schenk, P.M.. |
| 1. For two flocks of 48 and 40 hens, consisting of the F1 of Rhode Island Red males and White Leghorn females, peck-order, aggressiveness and egg production were determined. Flock I was built up step by step by continually adding a group of 8 hens to the hens already present in the testing pen. Flock II was brought into the testing pen as a whole at once. 2. The peek-order of the hens of flock I was clearly correlated with the date they had been put into the testing pen. The earlier the hens came into the testing pen, the higher their ranks. When the flock was rebuilt so that the groups were brought into the pen in reversed order, this correlation between peck-order and date of introduction into the pen was found again. 3. In flocks I and II a clear... |
| Tipo: Article / Letter to the editor |
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| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/504411 |
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