The Influence of Dubbing on Various Production Characteristics

Marks, H. L.; Siegel, P. B.

doi:10.3382/ps.0391091

Cited by 5 publications

(3 citation statements)

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“…Nos estudos realizados por ADJANOHOUN (1993), a queda de 6 a 7ºC na temperatura ambiente sem suplementação de energia na dieta provocou redução no volume de sêmen, o que ficou comprovado no presente experimento, já que houve queda de temperatura, e a quantidade de ração (125g ave -1 dia (MARKS & SIEGEL, 1960;LOGAN, 1965).…”

Section: Resultsunclassified

Efeito de dois níveis de proteína para machos reprodutores de corte com e sem retirada da crista

et al. 2009

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O objetivo deste experimento foi avaliar o efeito de diferentes níveis de proteína bruta (PB) na dieta para machos com ou sem crista. Peso corporal, volume de sêmen, número de células espermáticas e fertilidade foram os parâmetros avaliados. Foram utilizados 32 machos Cobb 500, 50% com crista inteira e 50% sem crista. Todos os machos foram submetidos às mesmas condições de manejo. Eles foram alojados em gaiolas metálicas individuais, com comedouro e bebedouro. O delineamento experimental usado foi o inteiramente casualizado com esquema fatorial 2x2, com duas condições de crista (com e sem) e dois níveis de proteína bruta (12 e 16%). O sêmen foi coletado por meio do método americano e o número de células espermáticas foi determinado por meio da câmara de Neubauer. Na 42ª, 43ª e 44ª semanas de idade, seis fêmeas para cada tratamento foram inseminadas artificialmente. As inseminações foram realizadas duas vezes por semana com sêmen fresco na dose de 0,05ml. Os ovos foram coletados quatro vezes por dia, identificados, desinfetados e incubados nas mesmas condições. Depois de 21 dias de incubação, os ovos foram quebrados e examinados macroscopicamente para análise da fertilidade. O nível de 12% de proteína bruta foi suficiente para atender as exigências reprodutivas, e a permanência da crista influenciou apenas o peso corporal dos machos, em que machos com crista apresentaram maior peso corporal.

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Section: Resultsunclassified

Efeito de dois níveis de proteína para machos reprodutores de corte com e sem retirada da crista

et al. 2009

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“…It has been speculated that this might be true (Williams et al, 1961), but not generally confirmed with data, although treatment standard errors reported suggest more uniformity in dubbed flocks (Marks and Siegel, 1960). Increased uniformity makes dubbing at hatch worth con- sidering, especially in experimental flocks where the reduction of variation in treatment groups may be critical.…”

Section: Studymentioning

confidence: 90%

“…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.…”

Section: Introductionmentioning

confidence: 94%

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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