Comparative study of growth curves in poultry

Knízetová, H; Hyánek, J; Hyánková, L.; Běliček, P.

doi:10.1186/1297-9686-27-4-365

Cited by 21 publications

(17 citation statements)

References 15 publications

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“…At the age of 26 weeks, chicken growth is in the stationary phase. Thus, in this phase, chicken has reached the maximum growth (Knízetová et al, 1995). Results of our study showed no significant effect between the g.2248G>A GH polymorphism and chicken carcass components.…”

Section: Discussionmentioning

confidence: 53%

The Associations of GH and GHR Genes with Carcass Components in Indonesian Kampung and Broiler Chicken Cross

Khaerunnisa

Jakaria

Arief

et al. 2017

Med Pet

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The chicken growth hormone (GH) and its receptor (growth hormone receptor, GHR) play important roles in chicken performances due to their crucial functions in growth. The variations of GH and GHR genes were then thought to be associated with the variations of the performances. This experiment was designed to identify the g.2248G>A GH and the g.565G>A GHR loci polymorphisms and to evaluate their associations with carcass components in Kampung and broiler chicken cross. A total of 215 chickens including 4 chicken populations (Kampung, Cobb broiler, F1, and F2 Kampung x broiler chicken cross) were screened to identify polymorphism using PCR-RFLP technique with EcoRV and Eco72I restriction enzyme for GH and GHR loci, respectively. The carcass components were recorded at 26 weeks of age on F2 Kampung and broiler chicken cross (42 chickens) for association study. Both the g.2248G>A GH and the g.565G>A GHR loci were polymorphic with two alleles (G and A) and three genotypes (GG, AG, and AA). The GG genotype and the G allele of GH locus were predominant in all chicken populations. While in GHR locus, the AA genotype and the A allele were found to be higher in all chicken populations. The association study showed that the g.565G>A GHR locus polymorphism had significant effect on carcass components, including live weight, carcass weight, breast weight, thighs weight, breast muscle weight, and thighs muscle weight. There was no significant association was found between the g.2248G>A GH genotype and carcass components. It could be concluded that the g.2248G>A GH and the g.565G>A GHR loci were polymorphic in Kampung and broiler chicken cross and the g.565G>A GHR locus was accosiated with carcass components. This g.565G>A GHR SNP might be an important candidate marker for chicken growth and muscle mass improvement. Keywords: Kampung chicken cross, growth hormone, growth hormone receptor, gene polymorphisms, carcass ABSTRAKHormon pertumbuhan dan reseptor hormon pertumbuhan memiliki peran penting dalam performa pertumbuhan ayam. Tujuan penelitian ini adalah mengidentifikasi keragaman gen hormon pertumbuhan (lokus g.2248G>A GH) dan gen reseptor hormon pertumbuhan (lokus g.565G>A GHR) dan mengevaluasi pengaruhnya pada komponen karkas pada ayam silangan Kampung dan broiler. Penentuan genotipe dilakukan pada 215 ekor ayam, yang terdiri atas 4 populasi (Kampung, ras pedaging strain Cobb, silangan F1 dan F2 Kampung x ras pedaging strain Cobb) menggunakan enzim pemotong EcoRV dan Eco72I masing-masing untuk fragmen lokus g.2248G>A GH dan lokus g.565G>A GHR. Analisis asosiasi dengan komponen karkas dilakukan pada populasi ayam silangan F2 Kampung x ras pedaging strain Cobb umur 26 minggu. Kedua lokus tersebut bersifat polimorfik dengan dua alel yang ditemukan (alel A dan G) dan tiga genotipe (genotipe GG, AG, dan AA). Genotipe GG dan alel G pada lokus g.2248G>A GH ditemukan dalam frekuensi tertinggi di semua populasi yang diuji. Sementara pada lokus g.565G>A GHR, genotipe AA dan alel A ditemukan paling dominan. Analisis asosiasi...

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Section: Discussionmentioning

confidence: 53%

The Associations of GH and GHR Genes with Carcass Components in Indonesian Kampung and Broiler Chicken Cross

Khaerunnisa

Jakaria

Arief

et al. 2017

Med Pet

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“…Reports describing the growth curve with a mathematical function suggest that the inflection point of the growth curve, that is, the end of the acceleration phase and the onset of the retardation phase, varies in the meat-type chickens between 6 and 9 weeks of age depending on selection traits used for their formation (Leclercq et al, 1989;Knížetová et al, 1991Knížetová et al, , 1995Mignon-Grasteau et al, 2000). In contrast, in the meat-type quail this was usually observed between 2 and 3 weeks of age (Marks, 1978;Anthony et al, 1991;Hyánková et al, 1998Hyánková et al, , 2001Hyánková et al, , 2002.…”

Section: Discussionmentioning

confidence: 81%

Divergent selection for shape of growth curve in Japanese quail. 4. Carcase composition and thyroid hormones

Hyánková

Novotná

Darras

2008

British Poultry Science

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1. Changes in the relative weights of carcase, abdominal fat, breast and leg muscles, and plasma thyroid hormone concentrations occurring during the first 6 weeks of postnatal growth were analysed in males of HG and LG lines divergently selected for high and low relative body weight (BW) gain between 11 and 28 d of age, respectively, and constant adult BW. 2. The second week of postnatal life was a critical age at which the HG males exhibited a relatively faster growth in comparison to their LG counterparts and permanently exceeded LG males in the percentage by weight of carcase, breast and leg muscle. A higher production of muscle tissues was associated with lower accumulation of abdominal fat before sexual maturity. 3. In general, the plasma T(3) level of HG quail exceeded that of LG quail. Nevertheless, significant differences were found only at 14, 21 and 28 d of age, that is, in the period during which the highest inter-line differences in relative growth rate were noted. Also the T(3)/T(4) ratio followed a similar trend while plasma T(4) level showed no clear and consistent inter-line differences. 4. The results suggest that the selection for the shape of the growth curve, like the selection for body fat, modifies the carcase quality owing to shortening/prolongation of the acceleration growth phase. Individuals with a short acceleration phase of the growth curve are characterised by low carcase quality during the fattening period.

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“…This ratio estimates the maturation rate of the curve (i.e. the relative rate at which M is reached) (Knízetová, 1995 Anthony et al (1996) and Aggrey et al (2003).…”

Section: Discussionmentioning

confidence: 99%

“…the relative rate at which asymptotic body weight is reached) (Knízetová, 1995). In HW line, the low value of β expressed lower maturation rate, compared to LW and C lines (P＜0.05).…”

Section: The C Linementioning

confidence: 99%

Evaluation of Growth Functions on Japanese Quail Lines

et al. 2013

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The aim of present study was to fit the best predictive equation to describe the growth curve of different Japanese quail lines. Moreover the effect of short-term divergent selection on the growth curve parameters was investigated. The quail lines utilized in the current study were two divergently selected lines for high (HW) and low (LW) 4-wk body weight (BW) and a control line (C). Determination and adjusted determination coefficients, relative error mean and standard deviation, mean square error, Akaike's information criteria and Schwarz Bayesian information criteria were used to evaluate the accuracy of prediction with the growth functions of Hyperbolastic (H1, H2, H3), Richards, Gompertz, Logistic and Von bertalanffy. Based on model behavior and statistical performance, the Gompertz and Logistic functions were not able to show a suitable fit for all three lines. The overall goodness of fit statistics in the HW line showed that the Richards function has the best fit to the data followed by H3, H2, H1, Von bertalanffy, Gompertz and Logistic functions, respectively. The overall results in the LW and C lines were similar to the HW line, except that Logistic function provided a better fit to the data than Gompertz. The study of growth pattern using Richards function revealed that short-term divergent selection altered the growth trajectory of selected lines through the changing of shape parameters and relative intensity of growth rates.

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Comparative study of growth curves in poultry

Cited by 21 publications

References 15 publications

The Associations of GH and GHR Genes with Carcass Components in Indonesian Kampung and Broiler Chicken Cross

The Associations of GH and GHR Genes with Carcass Components in Indonesian Kampung and Broiler Chicken Cross

Divergent selection for shape of growth curve in Japanese quail. 4. Carcase composition and thyroid hormones

Evaluation of Growth Functions on Japanese Quail Lines

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