Phenotypic Profiles of Broiler Stocks Fed Two Levels of Methionine and Lysine

Siegel, P. B.; Dunnington, E. A.; Jones, D. E.; Ubosi, C. O.; Gross, W. B.; Cherry, J. A.

doi:10.3382/ps.0630855

Cited by 27 publications

(6 citation statements)

References 12 publications

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“…Regardless of diet, at all ages Line A males consumed more feed, grew faster, and utilized feed more efficiently than Line B males. Lack of line by diet interactions observed in the present experiment was consistent with previous reports (Siegel and Wisman,TABLE 8 1966; Marks et al, 1969;Siegel et al, 1984;Sorensen, 1985;Cahaner et al, 1987) and suggested that the most efficient broiler line should be used for evaluating all diets. Significant line by feeding regimen interactions have been reported for BW (Pinchasov et al, 1985;Nir et al, 1987).…”

Section: Discussionsupporting

confidence: 95%

“…tors involved in this variation include growth rate, food intake, partitioning of energy for maintenance, synthesis of muscle protein and fat, ambient temperature, and subclinical infections (e.g., Siegel and Wisman, 1966;Peterson, 1970;Swain and Farrell, 1975;Walker and Farrell, 1976;Pym and Farrell, 1977;McCarthy and Siegel, 1983;Barbato et al, 1983;Siegel et al, 1984;Soller and Eitan, 1984).…”

Section: Introductionmentioning

confidence: 99%

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Genotype, Feeding Regimen, and Diet Interactions in Meat Chickens.

1991

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Allomorphic growth of organs and feed utilization were measured in cockerels from two meat lines known to differ in growth potential under alternate-day and daily feeding of diets differing in nutrient density. The faster growing line consumed more feed and utilized feed more efficiently than the slower growing line. Relative weights of heart and all segments of the gastrointestinal tract except the esophagus were smaller in the faster than in the slower growing line whereas breast, thigh, and drumstick were greater for the faster than the slower growing line. These patterns existed regardless of diet. In contrast, line by feeding regimen interactions were noted for most traits; the faster growing line was influenced more by restricted feeding than the slower growing line. Thus, the practice of selecting individuals in a restricted-feeding environment when commercial stocks have feed available to them at all times may be faulty. Although the alternate-day feeding regimen improved feed efficiency, results indicated that full benefit of feed restriction would be realized by feeding a diet higher in nutrient density.

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Section: Discussionsupporting

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Genotype, Feeding Regimen, and Diet Interactions in Meat Chickens.

1991

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“…Behavioral modifications in feed intake occurred concomitantly with selection for increased BW (Siegel et al, 1984). In the present experiment percentage carcass fat in the AL chickens was essentially double that of those fed on alternate days.…”

Section: Discussionmentioning

confidence: 60%

“…Negative correlations between antibody titers to SRBC and BW have been reported for chickens (Siegel et al, 1982(Siegel et al, , 1984van der Zijpp et al, 1987;Martin et al, 1988). Correlations between response to SRBC antigen and weights of bursa of Fabricius and thymus have been equivocal (Yamamoto and Glick, 1982;Ubosi et al, 1985;Martin et al, 1988).…”

Section: Introductionmentioning

confidence: 92%

Growth and Carcass Characteristics of Early- and Late-Feathering Broilers Reared Under Different Feeding Regimens

1991

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Growth, immunological characteristics, and carcass traits were measured in early-and latefeathering chickens maintained under three feeding regimens. The regimens were 1) AL, ad libitum, 2) RL, alternate day feed restriction from 6 to 27 days of age and then released to ad libitum, 3) SOD, alternate day feeding restriction from 6 days of age to the end of the experiment Sexual dimorphism was observed for accelerated growth with convergence in BW of RL with AL chickens occurring at a younger age in males than females. Absolute BW, feather weight, and gastrointestinal tract (GIT) weights were lower for SOD, after 45 days of age, than for AL and RL chickens. Relative to BW, however, GIT and liver weights, at 45 days of age but not 64 days of age, were heavier for SOD than for AL and RL chickens. Percentage of carcass lipid was lower for SOD than for AL and RL chickens. Generally, carcass traits and components of the GIT were similar for Regimens AL and RL at 45 and 64 days of age. Exceptions were lower percentages for carcass lipid and liver lipid for RL than AL chickens at 64 days of age. There was a significant feeding regimen by age interaction for heterophil to lymphocyte ratios caused by a greater increase in ratios with age for AL than for RL and SOD chickens. At 37 days of age, AL chickens had lower antibody titers to SRBC than SOD or RL chickens that did not differ. The AL chickens had reduced bursa of Fabricius and thymus weights relative to BW, indicative of immunological involution, along with reduced livability, compared with RL and SOD chickens, which did not differ in livability. Early-and late-feathering chickens were similar for most of the traits measured. One exception was higher antibody titers to SRBC in early-than late-feathering chickens. (

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“…It is well documented that derived AA requirements of growing chickens depend on many factors such as genotype, gender, age and investigated response parameters [ 18 , 19 , 20 , 21 , 22 ]. The applied modeling approach involves both the variation of daily protein deposition and predicted feed intake parameters.…”

Section: Resultsmentioning

confidence: 99%

Does the Naked Neck Meat Type Chicken Yield Lower Methionine Requirement Data?

Khan

Wecke

Liebert

2015

Animals

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Simple SummaryIt was hypothesized that naked neck chickens could have a lower methionine requirement according to their reduced feather coverage. The hypothesis was examined by nitrogen balance studies and non-linear model application for estimating methionine requirement data of naked neck chickens. It was concluded that naked neck birds do not require less methionine than normally-feathered birds.AbstractMethionine (Met) requirement studies with homozygous (Na/Na) and heterozygous (Na/na) naked neck meat type chicken utilized 144 birds of average weight (50% each genotype and sex) within two N balance experiments involving both the starter (d10–20) and grower period (d25–35). The birds were randomly allotted to five experimental diets with graded protein supply and Met as the limiting amino acid. The proportion of native feed protein sources (soy protein concentrate, maize, wheat, fishmeal and wheat gluten) was kept constant to ensure a uniform protein quality in all diets. The Met requirement depending on genotype, sex, age period and growth performance (protein deposition) was estimated using a non-linear modeling procedure of N utilization in monogastric animals. On average, 0.47% (Na/Na) and 0.45% (Na/na) dietary Met was established as adequate in the starter diet, as well as 0.37% (Na/Na) and 0.36% (Na/na) Met in the grower diet for both of the sexes. In conclusion, the Met requirement of the naked neck chicken is not significantly different from its normally-feathered counterparts. In addition, the low feather production was not reflected by reduced requirement for Met in naked neck birds. However, these conclusions are valid only at the given Met:Cys ratio (1:1) in the experimental diets.

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Phenotypic Profiles of Broiler Stocks Fed Two Levels of Methionine and Lysine

Cited by 27 publications

References 12 publications

Genotype, Feeding Regimen, and Diet Interactions in Meat Chickens.

Genotype, Feeding Regimen, and Diet Interactions in Meat Chickens.

Growth and Carcass Characteristics of Early- and Late-Feathering Broilers Reared Under Different Feeding Regimens

Does the Naked Neck Meat Type Chicken Yield Lower Methionine Requirement Data?

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