Influence of Comb Removal and Testosterone on Agnostic Behavior in Young Fowl

Dawson, J. S.; Siegel, H. S.

doi:10.3382/ps.0411103

Cited by 4 publications

(2 citation statements)

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“…Behavior and social interactions influence the performance of dubbed versus normal hens (Dawson and Siegel, 1962;Siegel and Hurst, 1962). Behavioral interactions are likely to be strongly influenced by group size with little or no expression with 2 or 3 hens per cage and none with individually caged hens.…”

Section: Studymentioning

confidence: 99%

“…The positive effects of dubbing are greater in cool weather (Laurent and Carmon, 1959;Marks and Siegel, 1960), possibly due to reduced energy loss, as the comb has functions associated with convective heat loss (Khan and Johnson, 1970;Marks and Siegel, 1960). The comb and wattles also influence social behavior in males and females (Dawson and Siegel, 1962;Siegel and Hurst, 1962), and dubbed females seem to be lower in the peck order of mixed flocks than nondubbed females. Dubbing makes it easier for birds to eat and removes potential avenues of infection through small wounds in the comb.…”

Section: Introductionmentioning

confidence: 94%

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Effects of Comb Dubbing on the Performance of Laying Stocks

1985

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Three studies were conducted with birds dubbed at hatch vs. dubbed and dewattled at 118 days or 255 to 260 days of age or with normal hens. In the first, involving 5928 pullets of four strains housed 1 per cage, dubbing and dewattling at 255 to 260 days caused small adverse effects on egg numbers as compared with nondubbed controls. Body size was reduced, and both egg weight (EW) and shell strength were increased slightly. In the second study, involving 8180 pullets of nine strains housed 1 per cage, dubbing and dewattling at 118 days slightly increased survivor egg production (SEP) and laying house mortality, and reduced age at first egg, 240-day EW, and 450-day Haugh units (HU), as compared with dubbing only at hatch. There were significant strain by dubbing treatment interactions for hen-day rate of lay (HDR) and SEP. In the third study, involving 1824 pullets of three strain crosses housed 2 and 3 birds per cage (three different cage sizes), there were no significant differences between birds dubbed at hatch and those not dubbed. Variation in age at 50% production, SEP, and HDR was reduced for the dubbed groups. These studies show that the older the birds are when dubbed, the greater the negative effects of dubbing. Hens dubbed at hatch exhibit no effects with the early dubbing or adverse effects in the laying house.

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Section: Studymentioning

confidence: 99%