Performance of early and late feathering broiler breeder females with different feeding regimens

O’Sullivan, N. P.; Dunnington, E. A.; Smith, E. J.; Gross, W. B.; Siegel, P. B.

doi:10.1080/00071669108417423

Cited by 31 publications

(17 citation statements)

References 35 publications

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“…co/i-inoculated chicks were killed by cervical dislocation and scored for pericardial and air sac lesions. Scores were as follows: 1, none; 2, mild air sac; 3, moderate air sac; 4, mild to moderate heart; 5, extensive heart; and 6, dead (O'Sullivan et al, 1991a).…”

Section: Traits Measuredmentioning

confidence: 99%

“…In broiler breeding there is a further complication because although broilers are reared under ad libitum feeding, the management of broiler breeders involves restriction in feed intake to control overconsumption and its deleterious effects on health and reproduction (Katanbaf et al, 1989;O'Sullivan et al, 1991a). As a result of this husbandry, research results have accumulated on effects of various feeding regimens on body weight (e.g., Nitsan et al, 1983;Nir et al, 1987;Robinson et al, 1993;Zuidhof et al, 1995) and feed intake and diet selection (Forbes, 1995).…”

Section: Introductionmentioning

confidence: 98%

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Feeding Regimen by Sire Family Interactions on Growth, Immunocompetence, and Disease Resistance in Chickens

et al. 1996

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Progeny from matings of 12 sires from a White Plymouth Rock line selected for high juvenile BW and 96 dams from a White Leghorn line selected for low antibody production to SRBC were reared under alternate-day (AD) or ad libitum (AL) feeding regimens. Within a feeding regimen males were heavier than females, and within a sex, chicks fed AL were heavier than those fed AD. Feeding regimen by sire family interactions were significant for BW at 21 d of age for both male and female progeny. The interaction was due to differences among sires in the magnitude of the AD: AL relationship. Product moment correlation coefficients between feeding regimens for male and female progeny of sire families for 21-d BW were essentially zero, which was consistent with the sire family by feeding regimen interactions observed at this age. At 41 d of age, relative to BW, weights of empty esophagus plus crop and of crop contents were greater for AD than AL chicks. There were differences among sire families for crop content and breast weights relative to BW. Lesion scores to Escherichia coli challenge were lower and antibody titers to SRBC antigen were higher in AD than in AL chicks. Sire families differed in antibody titers to SRBC antigen. Feeding regimen by sire family interactions were significant for percentage change in BW 144 h after E. coli challenge and lesion scores were greater for AL than AD chicks.

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Section: Traits Measuredmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Feeding Regimen by Sire Family Interactions on Growth, Immunocompetence, and Disease Resistance in Chickens

et al. 1996

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“…This selection for economically important production traits has led to two physiologically quite different types of chickens: meat-and layer-type strains which differ in body weight gain, maximum lifespan and in a negative relationship between performance traits of chickens and immunological responses (Boa-Amponsem et al, 1991;O'Sullivan et al, 1991;Kreukniet et al, 1994;Praharaj et al, 1995;Yunis et al, 2000). Layer-and meat-type strains differ in their immune response to infectious disease and to model antigens such as TNP-KLH (trinitrophenyl-conjugated keyhole limpet hemocyanin) and sheep red blood cell (SRBC) (Kreukniet et al, 1994;Koenen et al, 2002a).…”

Section: Introductionmentioning

confidence: 99%

Immunomodulation by probiotic lactobacilli in layer- and meat-type chickens

Koenen¹,

Kramer²,

Hulst³

et al. 2004

Br. Poultry Sc.

182

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1. The aim of the experiments was to evaluate whether selected probiotic lactobacillus strains have different immunomodulating effects in layer- and meat-type strain chickens. 2. Humoral and cellular specific and non-specific immune responses were studied by experiments on cellular proliferation, entry and survival of Salmonella bacteria in gut and spleen leukocytes, immunoglobulin isotypes and specific immunoglobulin titres. 3. The effects of two different feeding regimes (short and continuous feeding) and doses for administration of lactobacilli were studied. 4. The lactobacillus strains that were evaluated showed modulating effects on the immune system of layer- and meat-type chickens. 5. In meat-type strain chickens the lactobacilli had a stimulating effect when the chickens were young (up to 3 weeks) and the dose was relatively high, whereas in layer-type chickens a lower effective dose and discontinuous administration was also effective. 6. Immunoprobiotic lactobacilli can have a positive effect on humoral and cellular immune responses in layer- and meat-type strain chickens, but the lactobacillus strain to be used, the age of the animals and effective dose of lactobacilli to be administered need to be optimised.

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“…Several publications are available on the relation between performance traits and immunological responses (Boa-Amponsem et al, 1991;Kreukniet et al, 1994;O'Sullivan et al, 1991;Praharaj et al, 1995;Siegel et al, 1982;van der Zijpp, 1983;Qureshi and Havenstein, 1994). A negative correlation was found between weight and antibody response (total antibody response and specific anti-sheep red blood cell (SRBC)) in broilers.…”

Section: Introductionmentioning

confidence: 99%