ORIGINAL_ARTICLE
PRODUCTIVE PERFORMANCE AND MOLECULAR GENETIC CHARACTERIZATION OF MATERNAL SELECTED AND RANDOMBRED LINES IN THE 6th GENERATION OF JAPANESE QUAIL
The aims of the present study were to characterize the possible genetic and productive performance differences associated with the maternal selected line for six generations in Japanese quail compared to the randombred line. Body weight (BW) and shank length (SL) were recorded weekly until 5 weeks of age. BW and SL at first egg, age at first egg (AFE), first egg weight (FEW), number of days needed to produce the first 10 eggs (DN10), egg weight of the tenth egg (EW10) and egg mass of the first 10 eggs (EM10) were individually recorded for each female. The level of polymorphism between and within maternal line and a randombred line was estimated using two PCR-based DNA marker techniques RAPD and ISSR. Each line represented by 3 females and 2 males. Six RAPD and six ISSR primers were employed to find out genetic variations and relationships among these genotypes. The results indicated that line significantly affected BW at 35 days and AFE favoring the maternal line. However, the two lines insignificantly differed for BW at 1, 7, 14, 21 and 28 days of age. Females had higher insignificant BW than males at all studied ages. Line significantly affected SL at 21, 28 and 35 days of age favoring the maternal line. However, the two lines insignificantly differed for SL at 1, 7, 14 days of age and AFE. Females had higher SL than males at all studied ages, except for 14 days of age (P>0.05). Line had significant effect on AFE, maternal line attained sexual maturity at earlier age than the randombred line by 16.50 days. Maternal line had shorter DN10 (P≤0.05) by 4.10 days than the randombred line. The females of the maternal line laid insignificantly higher FEW, EW10 and EM10 than the females of the randombred line.
https://epsj.journals.ekb.eg/article_5366_d41d8cd98f00b204e9800998ecf8427e.pdf
2014-12-01
895
923
10.21608/epsj.2014.5366
Quail
productive performance
RAPD analysis
ISSR analysis
ORIGINAL_ARTICLE
ESTIMATION OF GENETIC PARAMETERS FOR SOME EGG PRODUCTION TRAITS IN THREE GENERATIONS OF CROSSING SOME LOCAL STRAINS WITH TWO COMMERCIAL LINES OF LAYING HENS
The current investigation was undertaken to study the effects of generation, hatch and genotype; to estimate the components of genetic variance and heritability and to determine the best cross within each generation based on multiple egg production traits. This information helps breeders to employ suitable breeding methodology for obtaining the parental groups for producing a commercial egg-type breed of chicken characterized by good productivity. Animal model analyses under both additive and dominance models were used to estimate the additive and dominance components of genetic variance. Best linear unbiased prediction (BLUP) was used for predicting the best cross for egg production traits. The local sire strains were (Silver Montazah, Baheij, Matrouh, Mandarah and Golden Montazah) together with two commercial dame lines (Lohman Brown and Lohman Selected Leghorn) were used in this experiment. The results showed clearly that all egg production traits in this study showed statistically insignificant differences under fixed effects of generations, hatches and genotypes. Contrarily, egg production traits were largely affected by the interactions generations x genotypes and generation x hatch x genotype. Moreover, the egg production traits in the first and second generations were genetically controlled by additive and dominance genetic variations, while in the third generation only dominance genetic variance was accounted a major part of the total genetic variance for all egg production traits studied. Consequently, heritability estimates in this study were low to moderate for egg production traits.
https://epsj.journals.ekb.eg/article_5367_d41d8cd98f00b204e9800998ecf8427e.pdf
2014-12-01
939
957
10.21608/epsj.2014.5367
animal model
Additive
Dominance
local chicken & commercial dame lines
ORIGINAL_ARTICLE
EFFECT OF FORCE MOLTING ON PRODUCTIVE PERFORMANCE OF SUDANI DUCKS
The present study aimed to investigate the effect of force molting procedures on the post molt performance and hatchability traits of Sudani ducks. Two hundred and forty Sudani laying ducks aged 65 weeks were randomly taken, weighted and divided into four experimental groups (each of three replicates). Ducks of the first group were fed ad-libitum and considered as control, the second group was force molted by fasting for 14 days, the third and fourth groups were force molted by feeding diets supplemented with Znic (1.0%) as Zinc oxide and Iodide (0.25%) as Potassium Iodide for 14 days, respectively. Photoperiod was natural daylight during force molting period, then increased to 16 h/d after molting. All ducks were fed the layer diet ad-libitum during the post-molting period.Results indicated that all force molting treatments caused significant (P≤0.01) decrease in live body weight than the control (non-molted) after molting. Ducks molted by fasting recorded the highest average body weight than the control at the end of experimental period. Viability (%) was not significantly affected due to different force molting treatments during the whole experimental period. Force molting by both fasting and Iodide treatment had significantly (P≤0.01) higher laying rate and egg number and mass per duck than the control during the overall experimental period. Feed consumption was significantly (P≤0.01) decreased for duck molted by fasting and Zinc treatment, whereas, ducks molted by Iodide treatment consumed insignificantly lower amount of feed than the control group during the overall experimental period (71-90 wks of age). Feed conversion ratio was significantly (P≤0.01) improved for all force molting treatments as compared to the control group during the overall experimental period.
https://epsj.journals.ekb.eg/article_5368_d41d8cd98f00b204e9800998ecf8427e.pdf
2014-12-01
925
938
10.21608/epsj.2014.5368
Sudani ducks
molting methods
Laying performance
fertility and hatchability
ORIGINAL_ARTICLE
CHARACTERIZATION OF SELECTED JAPANESE QUAIL AND RANDOMBRED CONTROL LINES IN THE 4th GENERATION BASED ON PRODUCTIVE PERFORMANCE AND RAPD-PCR ANALYSIS
Productive performance and RAPD analysis were used to find the genetic variations and relatedness among two selected, maternal (line1) and long shank length (line3), and randombred (line2) males and females of Japanese quail in the 4th generation of selection. Body weight (BW) and shank length (SL) were measured at 1, 7, 14, 21, 28 and 35 days of age and BW at sexual maturity. Age at first egg (AFE), Age at 10 eggs (Age10), Age at 30 eggs (Age30), number of days needed to produce the first 10 eggs (DN10), number of days needed to produce the first 30 eggs (DN30), egg mass of the first 10 eggs (EM10) and egg mass of the first 30 eggs (EM30) were recorded individually for each female. Individual blood samples were collected from 60 birds [20 birds (10 males and 10 females/line)] to extract DNA. RAPD-PCR amplification was performed using 10 random primers that succeeded to generate informative polymorphic bands. The results indicated that, line3 had higher BW and SL than line1 and line2 at all studied ages except at one day old, while the line2 had the significant lowest values at all ages. The line1 matured at earlier age than the line2 and line3, and had shorter DN10 and DN30. Also, line1 had lower Age10 and Age30 than the line2 and line3, and had heavier EM10 and EM30 than the line2 and line3.
https://epsj.journals.ekb.eg/article_5370_d41d8cd98f00b204e9800998ecf8427e.pdf
2014-12-01
869
893
10.21608/epsj.2014.5370
Quail
selection
maternal
Shank
Randombred
RAPD analysis
similarity