scholarly journals A production trial with layers of four hybrids under different environmental conditions in the Eastern Province of Saudi Arabia.

1971 ◽  
Vol 19 (4) ◽  
pp. 204-210
Author(s):  
H. Appelman ◽  
B.J. Bonhof
Keyword(s):  
Saudi Arabia ◽  
Rhode Island ◽  
New Hampshire ◽  
Egg Production ◽  
Live Weight ◽  
Egg Mass ◽  
White Leghorn ◽  
Eastern Province ◽  
Egg Weight ◽  
Food Consumed

161 Australorp X Rhode Island Red (RIR) X New Hampshire (NH) and 166 White Leghorn (WL) imported fowls were kept in insulated housing; 161 Australorp X RIR X NH, 166 WL, 154 RIR X WL and 148 RIR X NH X RIR fowls were kept in open houses. In the 6 groups resp., live weight at 126 days of age averaged 1602, 1227, 1578, 1234, 1397 and 1539 g, food consumption 4.02, 4.49, 4.03, 4.47, 4.25 and 4.17 kg/kg gain, overall laying percentage 56.6, 56.4, 52.5, 53.4, 55.0 and 37.5, egg production/hen 202, 201, 188, 191, 196 and 134, and egg weight 56.3, 56.3, 55.0, 55.8, 55.0 and 57.5 g. Egg mass averaged 1335, 1323, 1191, 1151, 1126 and 796 kg and food consumed/kg eggs produced 3.68, 3.53, 3.71, 3.25, 3.37 and 4.74 kg. Live weight at 16 mth of age averaged 2894, 2040, 2665, 1874, 2132 and 2517 g, and mortality 12.8, 11.1, 33.6, 43.5, 52.8 and 50.4%. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Effects of a short laying rest on postrest egg production and egg quality

1993 ◽  
Vol 2 (5) ◽  
pp. 437-445
Author(s):  
Tuomo Kiiskinen ◽  
Hilkka Hakatie
Keyword(s):  
Mass Production ◽  
Feed Efficiency ◽  
Egg Production ◽  
Egg Quality ◽  
Live Weight ◽  
Egg Mass ◽  
Whole Grain ◽  
Egg Weight ◽  
Egg Shell ◽  
Production Period

Two factorial trials, each including three commercial laying hybrids, were conducted to study the effects of a short laying rest on postrest performance of hens and on egg quality. A total of 1800 hens laying at 65% on an average (70 wks of age) were subjected to one of the following treatments: no rest (control, C) or feeding only whole-grain barley (WB) or fasting (F, Trial 1 only) until the rate oflay dropped to 0%, after which the birds were returned to the previous all-mash diet. The second laying period was six months. Egg production of the WB and F hens ceased within one week on an average and the birds were out of production for 10 days. Laying intensity during the second production period did not differ significantly between the treatments in each trial, but egg weight and daily egg mass production increased as a result of the rest treatments. The laying rest procedures reduced feed intake, improved feed efficiency and increased live weight significantly. Egg shell and albumen quality traits were significantly better in the laying rest groups than in the controls. Significant differences in performance and egg quality between the hybrids were mainly ascertained in Trial 2. The results suggest that a short laying rest is a feasible means of improving egg quality towards the end of the laying period. It can be accomplished successfully by feeding whole-grain barley.

Upgrading the indigenous poultry of Uganda IV. Egg production

1963 ◽  
Vol 60 (2) ◽  
pp. 225-227
Author(s):  
J. C. M. Trail
Keyword(s):  
Body Weight ◽  
Production Rate ◽  
Rhode Island ◽  
Food Consumption ◽  
Egg Production ◽  
White Leghorn ◽  
Egg Weight ◽  
Body Weights ◽  
The Cross ◽  
Egg Production Rate

Data on egg production, egg weight, food consumption, broodiness, mortality and body weights of the progeny of indigenous poultry of Uganda crossed with Light Sussex, White Leghorn, Rhode Island Red and Black Australorp breeds were collected collected over the 25-week period from 161 to 336 days of age and compared with the performances of indigenous poultry.In comparison with the indigenous birds, the cross-breeds had a 61% higher mean egg production rate, a 34% lower food consumption per pound of eggs produced, a 15% higher egg weight, a 30% reduction in mortality, a 23% increase in body weight and a decrease in broodiness.All the cross-breeds were superior in productive respects to the indigenous birds and the White Leghorn and Light Sussex breeds appeared to be the best for use in the upgrading of indigenous stock for highest egg production results.

scholarly journals Comportamiento productivo en primer ciclo de gallinas rhode island rojas y plymouth rock barradas

2021 ◽  
Vol 2 (4) ◽  
pp. 5157-5165
Author(s):  
Adrián Hernández-Sánchez ◽  
Ernestina Gutiérrez-Vázquez ◽  
Carlos Alberto Villalba-Sánchez ◽  
Rosa Elena Pérez- Sánchez ◽  
Ruy Ortiz-Rodríguez ◽  
...  
Keyword(s):  
Rhode Island ◽  
Live Weight ◽  
Experimental Period ◽  
Feed Consumption ◽  
Egg Mass ◽  
Productive Performance ◽  
Dual Purpose ◽  
Egg Weight ◽  
Commercial Feed ◽  
Ad Libitum

RESUMEN Se evaluó el comportamiento productivo de gallinas Rhode Island Rojas (RIR) y Plymouth Rock Barradas (PRB), durante el primer ciclo de postura, bajo las condiciones ambientales de la región del Altiplano en el estado de Michoacán, México. Para ello se utilizaron 26 gallinas doble propósito, distribuidas aleatoriamente en dos grupos: 13 RIR y 13 PRB de 20 semanas de edad, colocadas en jaulas individuales convencionales tipo batería; durante el período experimental (noviembre de 2019 a octubre de 2020), recibieron alimento comercial especial para gallinas en postura y agua, ambos ad libitum. Las variables bajo control fueron: peso vivo inicial (PVi), peso vivo final (PVf), consumo de alimento (CA), peso del huevo (PH), porcentaje de postura (%P), huevos por ciclo (HPC), masa de huevo (MH), índices morfométricos (IM), índices productivos (IP). Los resultados más relevantes en los genotipos RIR y PRB fueron: PVi y PVf, 2.019 vs. 2.160 kg y 2.105 vs. 2.300 kg respectivamente (P<0.05);  CA, RIR 124.1 vs. PRB 131.8 g (P<0.05); PH y %P para RIR y PRB: 59.4 vs. 61.2 g, 82.5 vs. 64.8 % (P<0.05) respectivamente; HPC y MH: 287.3 vs. 226.8 y 17.217 vs. 13.721 kg para RIR y PRB (P<0.0001) en su orden. En conclusión, las gallinas del genotipo Rhode Island Rojas mostraron mejor comportamiento productivo que sus contemporáneas Plymouth Rock Barradas.   ABSTRACT The productive behavior of Rhode Island Red (RIR) and Plymouth Rock Barradas (PRB) hens was evaluated during the first laying cycle under the environmental conditions of the Altiplano region in the state of Michoacán, Mexico. For this purpose, 26 dual-purpose hens were used, randomly distributed in two groups: 13 RIR and 13 PRB of 20 weeks of age, placed in individual conventional battery type cages; during the experimental period (November 2019 to October 2020), they received special commercial feed for laying hens and water, both ad libitum. The variables under control were: initial live weight (PVi), final live weight (PVf), feed consumption (CA), egg weight (PH), laying percentage (%P), eggs per cycle (HPC), egg mass (MH), morphometric indices (IM), productive indices (IP). The most relevant results in RIR and PRB genotypes were: PVi and PVf, 2.019 vs. 2.160 kg and 2.105 vs. 2.300 kg respectively (P<0.05); CA, RIR 124.1 vs. PRB 131.8 g (P<0. 05); PH and %P for RIR and PRB: 59.4 vs. 61.2 g, 82.5 vs. 64.8 % (P<0.05) respectively; HPC and MH: 287.3 vs. 226.8 and 17.217 vs. 13.721 kg for RIR and PRB (P<0.0001) in their order. In conclusion, hens of the Rhode Island Red genotype showed better productive performance than their Plymouth Rock Barradas contemporaries.  

Effect of Supplementation of Multi Enzymes on Production Performance and Egg Quality Traits in White Leghorn Layers

2016 ◽  
Vol 12 (2) ◽  
Author(s):  
C. Pandian ◽  
A. Sundaresan ◽  
A. V. Omprakash
Keyword(s):  
Egg Production ◽  
Egg Quality ◽  
Live Weight ◽  
Economic Benefits ◽  
Production Performance ◽  
Feed Consumption ◽  
Quality Traits ◽  
White Leghorn ◽  
Significant Difference ◽  
Enzyme Supplementation

The present study was conducted to assess the effect of supplementation of Multi-enzymes with lysophospholipids on production performance of pure line White Leghorn layers. Body weights before and after the experiment did not differ significantly across the experimental diets. Irrespective of the dietary treatments, the birds gained 3.83 per cent of live weight relative to its initial body weight. Mean per cent Hen housed egg production was significantly (Pis less than 0.05) higher in diet supplemented with 0.10 MEC-L than other groups. Mean egg weight and average daily feed consumption during 25 to 35 weeks of age indicated no significant effect of enzyme supplementation. Average daily feed consumption per bird in control, 0.05 % and 0.1% multi-enzyme supplemented groups was 108.13, 105.66 and 107.67 g respectively and birds offered control diet recorded numerically more feed intake than enzyme supplemented groups. Comparatively low feed per egg was observed in 0.10 per cent group followed by 0.05 per cent group which offers economic benefits than control diets. However, the egg quality traits between different dietary enzyme supplementation groups showed no significant difference.

Breeding

1937 ◽  
Vol 10 (4) ◽  
pp. 247-258 ◽  
Keyword(s):  
Egg Production ◽  
Average Weight ◽  
List Type ◽  
Type Number ◽  
White Leghorn ◽  
Egg Weight ◽  
Average Production ◽  
The Way

1.The connection between the rate of maturity (number of days between birth and production of the first egg) and egg production of 938 White Leghorn pullets, hatched and reared on the Experimental farm of the Oliefabrieken Calvé-Delft was investigated. The pullets were of various strains and received widely differing treatment as regards feeding.2.There is a curvilinear correlation between rate of maturity and to talproduction and also between rate of maturity and winter production. It is, therefore, not correct to calculate with rectilinear correlations or regressions.3.The conditions, obtaining during the rearing, influence not only the rate of maturity, but also the connection between the rate of maturity and egg production.4.It is, therefore, impossible to state any generally acceptable rules concerning the way in which the existing connection can be used to raise the average production by the elimination of certain birds.5.Even when the pullets have been carefully culled either before or at the commencement of production, it is possible to raise the average production still further by eliminating those birds, which come into production last. A considerable number of bad producers are found among the birds with the slowest rate of maturity.6.No connection was found between rate of maturity and mortality.7.Neither was there any connection between rate of nlaturity and the average weight of the eggs produced after December.8.For the 514 birds which began production after 30th September, 1935, a rectilinear correlation of +0.66±0.02 was found between rate of maturity and the average weight of the first ten eggs produced. The regression-eo-efficient of this “inception egg-weight” to rate of maturity in +0.16±0.02.

scholarly journals Heterosis effect in hybrid laying hens

2014 ◽  
Vol 30 (2) ◽  
pp. 303-311 ◽  
Author(s):  
P. Hristakieva ◽  
M. Oblakova ◽  
M. Lalev ◽  
N. Mincheva
Keyword(s):  
Sexual Maturity ◽  
Egg Production ◽  
Live Weight ◽  
Egg Laying ◽  
Production Traits ◽  
Egg Weight ◽  
Group V ◽  
Paternal Line ◽  
Group I ◽  
Heterosis Effect

The new original egg laying lines T, P and N selected at the Institute of Agriculture - Stara Zagora were used. Hybrid ?? ? ??, ?? ? ?? crosses were obtained and used for paternal line. Thereafter, the following breeding schedule of paternal and maternal lines was applied: Group I - (?????)? ?N?; group ?? - (?????)? ?N?; group ??? - ???N?; and group ?V - ???N?. The production traits of original and hybrid birds were recorded: live weight at the age of 8 and 18 weeks, age of sexual maturity in days, 150 days egg production, average egg weight - at 2-week intervals until end of lay; livability, heterosis effect. The live weights of hybrids at 8 and 18 weeks of age were statistically significantly lower compared to original lines. The values of heterosis for this parameter were negative for all four hybrid combinations. The earliest beginning of egg lay occurred in (?????) ? ?N? (162.08 days of age) and ???N? (163.11 days of age). The relative (%) heterosis for age of sexual maturity of studied hybrid combinations had moderate to low negative values. Average egg weights of hybrids were higher and the values of heterosis - positive for all four groups varying from 0.97% to 1.63%. The average 150 days egg production was lower in purebred lines compared to hybrids. The highest average 150 days egg production was determined in ???N? hybrids - 142 eggs. The heterosis effect for egg production in hybrids was significant.

THE EFFECT OF GRADED LEVELS OF NICARBAZIN ON REPRODUCTIVE PERFORMANCE OF LAYING HENS

1989 ◽  
Vol 69 (3) ◽  
pp. 757-764 ◽  
Author(s):  
S. LEESON ◽  
L. J. CASTON ◽  
J. D. SUMMERS
Keyword(s):  
Reproductive Performance ◽  
Feed Intake ◽  
Egg Production ◽  
Visual Loss ◽  
Laying Hens ◽  
Marked Effect ◽  
Significant Loss ◽  
White Leghorn ◽  
Egg Weight ◽  
Egg Shell

Three experiments were undertaken to investigate the coccidiostat, nicarbazin, on reproductive performance of layers. In trial 1, levels of 0, 5, 10, 20, 40, 80, 125, and 200 ppm nicarbazin were fed to White leghorn laying hens for 5 wk. By the 2nd week of nicarbazin treatment, egg production was significantly reduced in birds fed 125 and 200 ppm (P < 0.05). Similarly, increasing levels of nicarbazin resulted in decreasing egg weights (P < 0.01) and feed intake was significantly decreased. However, by the 2nd week post-nicarbazin treatment, egg production, egg weight, and feed intake had returned to normal. Nicarbazin had no effect on egg shell deformation or body weight. Nicarbazin had a marked effect on hatchability; levels of 125 and 200 ppm reduced hatchability significantly (P < 0.01) as well as producing an increased incidence of malpositions and malformations. When nicarbazin was withdrawn from the diet, hatchability returned to pretreatment values although malpositions and malformations were still in evidence. Experiments 2 and 3 were designed to study the effect of nicarbazin on production of brown-shelled eggs. In the 2nd experiment 0, 5, 10, 20, and 40 ppm of dietary nicarbazin resulted in significant loss of shell color at 20 and 40 ppm, whereas in exp. 3 with levels of 0, 80, 125, and 200 ppm, brown eggs lost virtually all their color. It is concluded that the adult White Leghorn bird can tolerate up to 125 ppm nicarbazin without significant (P < 0.01) loss of reproductive performance although lower levels show a trend for reduced production. Hatchability is depressed with nicarbazin levels in excess of 80 ppm, while trace levels will produce a visual loss of color in brown-shelled eggs. Key words: Layer, coccidiostat, reproductive performance

scholarly journals The effect of cage and house design on egg production and egg weight of White Leghorn hens: An epidemiological study

2012 ◽  
Vol 91 (7) ◽  
pp. 1522-1535 ◽  
Author(s):  
J.P. Garner ◽  
A.S. Kiess ◽  
J.A. Mench ◽  
R.C. Newberry ◽  
P.Y. Hester
Keyword(s):  
Epidemiological Study ◽  
Egg Production ◽  
White Leghorn ◽  
Egg Weight ◽  
House Design

Genetic parameters for egg weight v. age curve, and other egg production and egg weight traits, in synthetic lines of chickens

1983 ◽  
Vol 34 (1) ◽  
pp. 85 ◽  
Author(s):  
BH Yoo ◽  
BL Sheldon ◽  
RN Podger
Keyword(s):  
Standard Deviation ◽  
Genetic Correlation ◽  
Egg Production ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Egg Mass ◽  
Control Line ◽  
Egg Weight ◽  
Egg Number ◽  
Selection For

An exponential curve, W = P-Qexp(- Rt), where W is egg weight at age t, was fitted to egg weights of individual pullets, and genetic parameters were estimated for P, Q and R, the residual standard deviation and other egg weight and egg production characters. The data consisted of records collected over six generations on more than 4000 pullets in two selection lines and a control line which originated from a synthetic gene pool of White Leghorn x Australorp crosses. The half-sib and offspring-on-parent regression estimates of heritability pooled over the lines were 0.23 and 0.33 for P, 0.14 and 0.20 for Q, and 0.14 and 0.25 for R. Genetic correlations were estimated to be -0.10 between P and Q, -0.46 between P and R, and 0.90 between Q and R. These estimates suggest that the egg weight v. age curve may be modified to increase the proportion of eggs in desirable weight grades and reduce the incidence of oversized eggs later in the production year. The genetic correlation between mean weight of first 10 eggs and egg weight at 62 weeks of age was estimated to be 0.68, further suggesting that early egg weight may be improved partly independently of late egg weight. The heritability estimates of egg mass output were not higher than those of egg number in spite of the highly heritable average egg weight being an important component of egg mass, probably because of the negative genetic correlation (r = -0.49) between egg number and average egg weight. The standard deviation of individual pullet's egg weights was moderately heritable and genetically correlated positively with egg weight characters and negatively with egg production; these estimates were consistent with the responses to selection for reduced egg weight variability observed elsewhere

scholarly journals Effect of a single dose of iodized fatty acid ester Lipiodol® Ultra-Fluid on egg iodine concentrations and egg production

2012 ◽  
Vol 48 (No. 10) ◽  
pp. 293-300 ◽  
Author(s):  
M. Trckova ◽  
B. Pisarikova ◽  
P. Suchy ◽  
I. Herzig
Keyword(s):  
Fatty Acid ◽  
Potassium Iodide ◽  
Egg Production ◽  
Live Weight ◽  
Egg Yolk ◽  
Fatty Acid Esters ◽  
Control Group ◽  
Egg Mass ◽  
Adaptation Period ◽  
Oral Application

The aim of the study was to test whether a single intramuscular or oral application of iodized fatty acid esters (IFAE), without any iodine supplements in the rations, would increase for a long time iodine concentrations in egg yolk without any drop of egg production and egg quality. The results were compared with those obtained using the conventional iodine source &ndash; potassium iodide (KI). After the adaptation period, 10 mg of iodine/kg of live weight were applied to the experimental layers at the age of 21 weeks. The layers were divided into four groups: the group K-KI received iodine orally in the form of potassium iodide; iodine was applied orally in the form of IFAE to the group P-PO; and iodine as IFAE was applied intramuscularly to the group P-IM. The control group (K-0) received no iodine. Increased concentrations of iodine in egg yolk were observed following oral application of KI and IFAE. Maximum concentrations were measured on day 5 following application (12 863 &plusmn; 3 269 &mu;g I/kg for K-KI, and 14 037 &plusmn; 2 506 &mu;g I/kg for P-PO). Quite different course of changes was recorded following intramuscular application of iodine (group P-IM). Both, the increase and drop of iodine concentrations were slow, maximum values were measured from day 11 till day 35 of the experiment (from 769 &plusmn; 426 to 1 163 &plusmn; 757 &mu;g of I/kg yolk). Intramus&shy;cular application of IFAE resulted in significantly higher levels (P &lt; 0.05, P &lt; 0.01) of iodine in egg yolk from day 11 till the end of the experiment (on day 154) compared with the group K-0, and from day 14 compared with the group K-KI. At the same time, more fluent course of egg production with maximum at the age of 34 weeks was observed in laying hens. No effect of iodine application on egg production and egg mass was found. Significantly higher weights of eggs (P &lt; 0.05, P &lt; 0.01) and egg white (P &lt; 0.05) were recorded following oral and intramuscular application of IFAE compared with the control group K-0.

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