scholarly journals Effects of Age at Sexual Maturity on Body Weight, Egg Weight and Egg Production

1952 ◽  
Vol 31 (6) ◽  
pp. 1050-1054 ◽  
Author(s):  
F.A. Hays
Keyword(s):  
Body Weight ◽  
Sexual Maturity ◽  
Egg Production ◽  
Egg Weight

Effect of constant photoperiods on the laying performance of broiler breeders allowed conventional or accelerated growth

2005 ◽  
Vol 143 (1) ◽  
pp. 97-108 ◽  
Author(s):  
P. D. LEWIS ◽  
D. BACKHOUSE ◽  
R. M. GOUS
Keyword(s):  
Body Weight ◽  
Sexual Development ◽  
Sexual Maturity ◽  
Egg Production ◽  
Egg Laying ◽  
Broiler Breeders ◽  
Egg Weight ◽  
Laying Performance ◽  
Body Weights ◽  
Accelerated Growth

An experiment was conducted at the University of KwaZulu–Natal to assess the effect of constant photoperiods on sexual maturity and egg-laying performance in broiler breeders given two levels of control-feeding during the rearing phase. Cobb broiler breeder females were grown to reach 2·1 kg body weight at 17 or 21 weeks, and maintained on 10, 11, 12, 13, 14 or 16-h photoperiods from 2 days to 68 weeks of age. There were no significant interactions between photoperiod and growth rate for any production parameter. The time required reaching 2·1 kg increased proportionally with photoperiod but, because of delayed sexual development, birds on longer photoperiods consumed more feed to, and were heavier at, sexual maturity than shorter daylengths. The longer-photoperiod birds also had inferior rates of lay in the first half of the cycle, but superior in the second, which, together with the photoperiodic effects on maturity, resulted in birds on 11, 13 or 14 h producing most eggs to 68 weeks, and those on 16 h fewest. It is possible that the pattern of egg production was due to some of the birds on [ges ]13-h photoperiods becoming photorefractory, having a mid-cycle pause, and then spontaneously resuming egg production in the latter half of the cycle. However, a hinge-analysis of current and other data to the more usual depletion age of 60 weeks showed that the combined effects of photoperiod on sexual maturity and egg production resulted in constant 10-h birds producing the highest number of eggs, with numbers decreasing by 3·6 eggs/h of photoperiod above the hinge and 7·8 eggs/h of photoperiod below it. Mean egg weight increased by 0·4 g/h of photoperiod, but the proportion of abnormally large and floor eggs and the incidence of mortality were unaffected by daylength. For each photoperiod, accelerated growth resulted in body weights being heavier than controls at sexual maturity, despite the mean age at maturity being 10 days earlier for the faster-growing birds. Body weights for the two growth groups were not significantly different at 68 weeks. Faster-growth birds consumed 1 kg less feed to 2·1 kg body weight, but 1·3 kg more feed to sexual maturity and 2·7 kg more to 68 weeks, and produced 6 more eggs than, but had similar patterns of egg production to, the conventionally managed controls. Mean egg weight, the proportion of floor eggs and the incidence of mortality were similar for both groups. Notwithstanding that the overall production of abnormally large eggs was low (1·1 eggs per bird); the faster-growing birds produced significantly more than the controls. Egg weight was positively influenced by age at sexual maturity, body weight at sexual maturity and photoperiod, but was unaffected by rate of growth to 2·1 kg per se.These findings show that there are differences between broiler breeders and egg-type pullets in their response to constant photoperiods. It is likely that the factors responsible for these differences, particularly in terms of sexual development, are the exhibition of photorefractoriness by, and the retardational effects of controlled feeding on, broiler breeders.

scholarly journals Canonical correlation analysis for studying the relationship between egg production traits and body weight, egg weight and age at sexual maturity in layers

2011 ◽  
Vol 50 (No. 4) ◽  
pp. 163-168 ◽  
Author(s):  
Y. Akbaş ◽  
Ç. Takma
Keyword(s):  
Body Weight ◽  
Correlation Analysis ◽  
Canonical Correlation Analysis ◽  
Canonical Correlation ◽  
Sexual Maturity ◽  
Egg Production ◽  
Production Traits ◽  
Egg Weight ◽  
Canonical Correlations ◽  
The Relationship

In this study, canonical correlation analysis was applied to layer data to estimate the relationships of egg production with age at sexual maturity, body weight and egg weight. For this purpose, it was designed to evaluate the relationship between two sets of variables of laying hens: egg numbers at three different periods as the first set of variables (Y) and age at sexual maturity, body weight, egg weight as the second set of variables (X) by using canonical correlation analysis. Estimated canonical correlations between the first and the second pair of canonical variates were significant (P < 0.01). Canonical weights and loadings from canonical correlation analysis indicated that age at sexual maturity had the largest contribution as compared with body weight and egg weight to variation of the number of egg productions at three different periods.  

scholarly journals Conservation of purelines and their performances under research farm condition

2020 ◽  
Vol 20 (1-2) ◽  
pp. 26-32
Author(s):  
MA Rashid ◽  
MS Rana ◽  
MN Islam ◽  
S Faruque ◽  
H Khatun ◽  
...  
Keyword(s):  
Body Weight ◽  
Feed Intake ◽  
Sexual Maturity ◽  
Egg Production ◽  
Breeding Programme ◽  
Egg Mass ◽  
Next Generation ◽  
Egg Weight ◽  
Treatment Groups ◽  
Pure Lines

The study was conducted at Bangladesh Livestock Research Institute to evaluate the productive and reproductive performances of 4 pure lines conserving for the production of next generation. A total of 2000 pedigree hatched day-old chicks were wing banded and reared up to 40 weeks of age. Data were kept on daily feed intake (g/bird/day), weekly body weight (g), age at sexual maturity (days), daily egg production (%) and egg weight (g). There were highly significant differences (p<0.01) in body weight at 38 weeks, age at sexual maturity, egg production up to 40 weeks and egg weight at 38 weeks of age among the treatment groups. There were no significant differences (P>0.05) in fertility, hatchability, dead in germ, sound chick and dead in shell percentage among the treatment except cull chicks where L1 showed the highest percent of cull chicks.  Egg production at 23-28 and 35-40 weeks of age differ significantly (p<0.01) except at 29-34 weeks of age (p>0.05). Significant variations for FCR observed at 35-40 weeks of age while it was non-significant (p>0.05) at 23-28 and 29-34 weeks of age. It is revealed that line-2 is superior in terms of egg production, age at sexual maturity and egg mass where line-1 was better in terms of FCR value. Considering the results it may be concluded that there are significant variations exists regarding egg production performances among the experimental pure lines, thus could be utilized successfully for the production of high yielding strains through proper breeding programme. Bangladesh J. of Livestock Res. 20(1-2): 26-32, Jan-Dec 2013

scholarly journals PERFORMANCES OF THE INDIGENOUS CHICKENS OF NIGERIA AND THE APOLLO 1. EGG WEIGHT, RATE OF PRODUCTION AND FACTORS AFFECTING THEM

2021 ◽  
Vol 4 (1) ◽  
pp. 67-79
Author(s):  
A. Osu ◽  
D. Almut
Keyword(s):  
Body Weight ◽  
Sexual Maturity ◽  
Egg Production ◽  
Indigenous Chicken ◽  
Egg Weight ◽  
Factors Affecting ◽  
Indigenous Chickens ◽  
Breed Differences ◽  
Two Generations

Data on the Ife Breed of the indigenous chicken and the Apollo, an imported commercial egg strain were analysed for effect of breed, time and generation of hatch, body weight at various ages, and age at sexual maturity on egg weight and rate of egg production to eight months. There were highly significant generation and breed differences, with a mean of 116 eggs for the Ife Breed compared to 106 for the Apollo over two generations. Other factors that significantly affected egg production were body weight and age at sexual maturity, and mature egg weight. Mean pullet year egg weight showed breed and hatch differences and were significantly affected by body weight and age at sexual maturity. Mean egg weight for the Ife Breed was 32.3 compared to 48.7 for the Apollo.

scholarly journals Study on the Productive and Reproductive Performances of BLRI-1 and BLRI-2 Ducks in Bangladesh

2014 ◽  
Vol 12 (1) ◽  
pp. 10-14
Author(s):  
MS Islam ◽  
H Khatun ◽  
MN Islam ◽  
S Faruque ◽  
MSK Sarker
Keyword(s):  
Body Weight ◽  
Least Squares ◽  
Feed Intake ◽  
Sexual Maturity ◽  
Egg Production ◽  
The Body ◽  
Embryonic Mortality ◽  
Intensive Management ◽  
Egg Weight ◽  
Egg Ratio

A total of 887 ducklings of BLRI-1 duck genotype and 352 ducklings of BLRI-2 duck genotype were studied to measure productive and reproductive performances under intensive management. Data were recorded on body weight, egg production, egg weight, fertility, embryonic mortality, hatchability, feed intake, age at sexual maturity, body weight at maturity and egg weight at maturity. The fertility rate in BLRI-1duck was significantly (p<0.01) higher than that of BLRI-2 duck, while hatchability of BLRI-2 duck on fertile eggs were significantly (p<0.05) better compared to BLRI-1 duck. The embryonic mortality was significantly (p<0.01) higher in BLRI-2 duck than BLRI-1 duck. Duckling weight was influenced by egg weight (p<0.05) but difference in duckling: egg ratio was not significant (p>0.05). Hatching weight, 4th week and 12th week of age were significant (p<0.05) influent while the body weight of ducks at 8th week did not differ significantly (p>0.05) for BLRI-1 and BLRI-2 ducks, respectively. The least squares mean for age at sexual maturity were 158 days and 151.75 days, respectively for BLRI-1 and BLRI-2 ducks (p<0.05). BLRI-1 duck started to lay eggs almost one week late compared to BLRI-2 duck. Duck weight at sexual maturity, egg weight at first lay and egg production did not have significant (p>0.05) difference between genotypes. It may be concluded that BLRI-2 duck genotype is superior in terms of hatchability and age at sexual maturity to BLRI-1 duck genotype. DOI: http://dx.doi.org/10.3329/agric.v12i1.19485 The Agriculturists 2014; 12(1) 10-14

scholarly journals Plasma alkaline phosphatase polymer phism and it’s association with productivity in Iraqi fowl

2008 ◽  
Vol 5 (2) ◽  
pp. 178-181
Author(s):  
Baghdad Science Journal
Keyword(s):  
Alkaline Phosphatase ◽  
Body Weight ◽  
Gel Electrophoresis ◽  
Sexual Maturity ◽  
Gene Frequency ◽  
Egg Production ◽  
Gene Marker ◽  
Autosomal Locus ◽  
Egg Weight ◽  
Plasma Alkaline Phosphatase

Plasma alkaline phosphatase isozyme in Iraqi fowl was studied by acrylamide gel electrophoresis. Two phenotypes fast and slow, were observed. These two phenotypes have been shown to be controlled by one single autosomal locus with two allel AKPF and AKPS. The gene frequency of AKPS is dominant over the AKPF. The result indicated that gene frequency of AKPF in leghorn and new hamshire was more frequent than in local Iraqi birds. Birds of fast isozyme type had higher 90 – day's egg production and egg weights as compared to those with slow isozyme. It is concluded that the fast isozyme can be used as gene marker for spotting out pullets with high body weight sexual maturity, high egg production and high egg weight.

scholarly journals Crossing effect for improving egg production traits in chickens involving local and commercial strains

2020 ◽  
Vol 13 (3) ◽  
pp. 407-412
Author(s):  
Mostafa Ahmed Soliman ◽  
Mohamed Hassan Khalil ◽  
Karim El-Sabrout ◽  
Mostafa Kamel Shebl
Keyword(s):  
Body Weight ◽  
Sexual Maturity ◽  
Egg Production ◽  
Local Strain ◽  
Egg Mass ◽  
Reciprocal Effects ◽  
Production Traits ◽  
Egg Weight ◽  
Commercial Strain ◽  
Egg Traits

Aim: This study aimed to contribute to the productivity improvement of the local chickens by enhancing their egg production traits using a crossbreeding program between Alexandria (local strain) and Lohmann White (commercial strain). Materials and Methods: One thousand two-hundred and eighty-five 4-week-old chicks from two strains: Alexandria local strain (AA) and Lohmann White commercial strain (LL) and their reciprocal crosses obtained from 16 males and 160 females, were used to produce four genetic groups (AA, LL, AL, and LA). Differences among genotypes, direct additive, heterosis, and reciprocal effects were investigated regarding the following traits: Body weight at 4 and 8 weeks and at the age of sexual maturity, age at sexual maturity, egg production, average egg weight, and egg mass during the first 90 days of laying. Results: Statistically significant effects of the genotypes were observed on traits studied. Analysis of direct additive effects showed that AA was superior as a sire strain for improving body weight at early age. For egg traits (age at sexual maturity, egg production, average egg weight, and egg mass), LL was better as a sire strain to improve these traits. Significant positive heterosis percentages were observed for body weight. The crosses (AL and reciprocal) were significantly superior in egg traits (egg production, average egg weight, and egg mass) compared to the local strain. The cross (LA) laid significantly earlier than the local strain. Analysis of reciprocal effects cleared that the local strain could be used as a strain of dam to improve body weight and egg traits. Conclusion: Crossing improved egg production, egg weight, and egg mass in hybrids compared to the local strain.

The influence of body weight at point-of-lay on the production responses of restricted-reared pullets

1984 ◽  
Vol 35 (6) ◽  
pp. 845 ◽  
Author(s):  
D Balnave
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Sexual Maturity ◽  
Egg Production ◽  
Egg Mass ◽  
Egg Weight ◽  
Growing Period ◽  
Factors Influencing ◽  
Major Factors ◽  
Time Restriction

The food intake, age at sexual maturity, egg weight and daily egg mass output of pullets fed on a time restriction basis during growth were significantly influenced by body weight at 21 weeks of age. Egg production was not affected significantly when 21-week body weight varied between 1.3 and 1.8 kg. It is suggested that one of the major factors influencing the performance of a pullet flock during lay is the number of birds of abnormally low body weight present at the end of the growing period.

scholarly journals Backyard poultry farming for meat and egg production: rural enterprise

2020 ◽  
Vol 1 (1) ◽  
pp. 52-55
Author(s):  
Dinesh Mahto ◽  
Keyword(s):  
Body Weight ◽  
Sexual Maturity ◽  
Egg Production ◽  
The Body ◽  
Egg Weight ◽  
Backyard Poultry ◽  
Poultry Birds ◽  
Body Weights ◽  
Poultry Farming

Twenty farmers selected from each village for 6 villages of the district and skill based training on various aspects of backyard poultry farming. Participants enriched with sound knowledge were distributed with 25 Vanaraja & Grampriya chicks per person. The records of mean body weight of Grampriya and Vanaraja at different week interval. The body weight of crosses differ significantly (p < 0.05) after 4th week of age from their parents. The body weights of crosses were significantly (p < 0.05) higher than Hazra (Desi) birds and nearly similar to Vanaraja birds at different period of age attaining the sexual maturity in different groups of poultry birds. Vanaraja matures at the age of 141.62 days, Hazra (Desi) bird at 186.47 days and Grampriya at 158.32 days. The pullet egg weight of Vanaraja, Hazra (Desi) and Grampriya were 38.75, 30.82 and 34.94 g, egg weight at 40 weeks of age were 55.87, 42.89 and 51.26 g and increase in egg weight were 17.12, 12.07 and 15.42 g respectively. The hatchability percentages were 87.56%, 89.36% and 85.72% on fertile egg set and 68.23%, 68.92% and 64.74% on total egg set basis respectively in Vanaraja, Grampriya and local desi birds.

scholarly journals Effect of sex-linked dwarf gene on exterior appearance, productive performance and egg characteristics in a colored broiler dam line

2015 ◽  
Vol 31 (2) ◽  
pp. 163-174
Author(s):  
N. Mincheva ◽  
M. Oblakova ◽  
P. Hristakieva ◽  
I. Ivanova ◽  
M. Lalev
Keyword(s):  
Body Weight ◽  
Feed Intake ◽  
Sexual Maturity ◽  
Egg Production ◽  
Egg Quality ◽  
Production Cycle ◽  
Feed Conversion ◽  
Egg Weight ◽  
Dwarf Gene ◽  
Slow Growing

The effect of sex-linked dwarf gene was investigated through comparison of dwarf hens with their full-sib normal sisters obtained by mating heterozygous males (DW/dw) to normal females (DW/_) from line F (used as maternal form for production of slow-growing colored chickens) with respect to the following traits: body weight, shank and keel length at 40 weeks of age, age of sexual maturity (at 50 % production), egg production, egg weight, feed intake, feed utilization, livability, fertility, hatchability and egg quality characteristics. The results demonstrated that the dw gene caused statistically significant reduction of body weight by 29.15 %, shank length by 20.17 %, keel length by 7 % and egg weight by 5.72 % (p<0.001). The hens with normal genotype attained sexual maturity 7 days earlier (p<0.001), but nevertheless, rate of lay was similar to that of mini forms. There were no considerable differences between both genetic groups with respect to livability percentage over the production cycle. Dwarf hens consumed by 23.38 % less feed (p<0.01) than normal sized hens and converted nutrients more efficiently by 12.69 % (p<0.05). The presence of dw gene in hen genotype increased the eggshell percentage, reduced egg yolk and albumen weights and had no effect on their quality. The positive effect of the sex-linked dwarf gene on economically important traits - feed intake and feed conversion, hatchability of eggs set, is a prerequisite for the development of more efficient broiler breeder hens for production of slow-growing chickens.

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