The Relationship between Age and Genotype and the Growth of Commercial Meat Strain Chickens

Ms, Lilburn; Ngiam-Rilling, K.; Fc, Leung; Jh, Smith

doi:10.3181/00379727-182-42348

Cited by 8 publications

(1 citation statement)

References 3 publications

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“…The chicks in the third strain were a cross of genetically normal, but slower growing roaster strain dams (Dw/-) and normal broiler sires. The roaster strain has been previously described by Lilburn et al (1986b).…”

Section: Methodsmentioning

confidence: 99%

Relationships Among Mineral Balance in the Diet, Early Growth Manipulation, and Incidence of Tibial Dyschondroplasia in Different Strains of Meat Type Chickens

et al. 1989

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In two experiments, a high dietary level of available phosphorus (.65%) in the presence of high chloride concentrations (.36%) was associated with a significant increase in the incidence of tibial dyschondroplasia (TD) in male broiler chickens. The level of dietary calcium and the interaction between Ca and available P had no effect on TD. Heterozygous normal (DW/DW) male broilers had a significantly lower incidence of TD than homozygous normal (Dw/Dw) chicks (Experiments 1 and 2). In Experiments 3 and 4, there were no significant differences between BW at 14 days for roaster-broiler cross and broiler chicks. At 21 and 28 days, however, the roaster-broiler cross chicks weighed significantly less than the broilers and had a significantly lower incidence of TD. Decreasing growth rates in broiler chicks after 14 days of age resulted in a significant decrease in the incidence of TD (Experiments 4 and 5), but did not decrease the severity of TD lesions at 28 days (Experiment 5). Depressed growth from 0 to 14 days decreased, but did not eliminate, TD lesions (45%) at 28 days, but it did significantly decrease the severity of the lesions compared with that in the 14 to 28-day manipulation treatments (Experiment 5). In Experiment 5, chicks were growth restricted from 0 to 14 or 14 to 21 days and then ad libitum fed the control diet until 28 days of age. The serum growth hormone concentrations at 28 days were inversely related to the rate of BW gain from 21 to 28 days of age, independent of BW at 21 or 28 days or feed consumption from 21 to 28 days. There were no differences in serum concentration of thyroxine or triiodothyronine at 28 days.

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Section: Methodsmentioning

confidence: 99%

Relationships Among Mineral Balance in the Diet, Early Growth Manipulation, and Incidence of Tibial Dyschondroplasia in Different Strains of Meat Type Chickens

et al. 1989

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Commercial consequences of selecting for leanness in poultry

Lilburn¹

1988

Leanness in Domestic Birds

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Effects of the sex‐linked dwarf gene (dw) on skeletal muscle cellularity in broiler chickens

Knízetová

1993

British Poultry Science

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1. The number and size of muscle fibres and the DNA concentration in m. pectoralis superficialis of normal (Dw+/-) and dwarf (dw/-) White Plymouth Rock females were investigated at the ages of 9 and 52 weeks. 2. Live weight and total meat was reduced by 37.4 and 42.8% in dw/- as compared with Dw+/- females at the age of 9 weeks. The suppressive effect of the dwarf allele on the weight of m. pectoralis superficialis was 40.6% (67.8 v. 40.3 g in Dw+/- and dw/- genotypes). This reduction in weight was accompanied by a similar decrease of DNA content (28.8 v. 17.1 mg, i.e. 40.6%), a decrease in number of muscle fibres (829 x 10(3) v. 654 x 10(3), i.e. 21.2%) and fibre diameter (30.80 v. 28.95 microns, i.e. 6.0%). In mature hens, the differences between genotypes Dw+/- and dw/- were slightly smaller. 3. The different relationships between the muscle growth traits studied are discussed.

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The Relationship between Age and Genotype and the Growth of Commercial Meat Strain Chickens

Cited by 8 publications

References 3 publications

Relationships Among Mineral Balance in the Diet, Early Growth Manipulation, and Incidence of Tibial Dyschondroplasia in Different Strains of Meat Type Chickens

Relationships Among Mineral Balance in the Diet, Early Growth Manipulation, and Incidence of Tibial Dyschondroplasia in Different Strains of Meat Type Chickens

Commercial consequences of selecting for leanness in poultry

Effects of the sex‐linked dwarf gene (dw) on skeletal muscle cellularity in broiler chickens

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