Spawning dynamics and egg production characteristics of captive Seriola dorsalis assessed using parentage analyses

2021 ◽  
Author(s):  
Elizabeth Schmidt ◽  
Kevin Stuart ◽  
John Hyde ◽  
Catherine Purcell ◽  
Mark Drawbridge
Keyword(s):  
Egg Production ◽  
Seriola Dorsalis ◽  
Production Characteristics

scholarly journals First and Second Cycle Egg Production Characteristics in Commercial Table Egg Flocks

1992 ◽  
Vol 71 (3) ◽  
pp. 448-459 ◽  
Author(s):  
DONALD D. BELL ◽  
CAROL J. ADAMS
Keyword(s):  
Egg Production ◽  
Production Characteristics

Effects of cage population and stocking density on the performance of layers in Queensland

1975 ◽  
Vol 15 (76) ◽  
pp. 619 ◽  
Author(s):  
JK Connor ◽  
HW Burton
Keyword(s):  
Egg Production ◽  
Control Measure ◽  
Stocking Density ◽  
Housing System ◽  
Feed Consumption ◽  
White Leghorn ◽  
Housing Systems ◽  
Cage Size ◽  
Cage Population ◽  
Production Characteristics

Three commercial egg production strains, a White Leghorn and two White Leghorn x Australorp, were used in two experiments which examined the effects of cage size and number of birds per cage on production characteristics. Nine cage housing systems varying from a 23 cm frontage single bird cage to a 61 cm frontage cage housing seven birds were compared. The efficacy of debeaking again at 12 or 20 weeks of age following routine debeaking at five days of age as a cannibalism control measure in a comparison of five housing systems was examined in another two experiments. Further experiments examined the practice of housing birds according to body weight in either one, two or three bird cage populations. Increasing bird numbers per cage or stocking density had little effect on egg weight, feed consumption or liveweight gain but decreased egg production and increased mortality in experiments where cannibalism was a significant cause of death. Hen housed egg production was an accurate measure of bird performance for comparison of housing systems. In experiments where additional debeaking was carried out the incidence of cannibalism was insignificant and debeaking at 12 or 20 weeks had no detrimental effect on bird performance. No strain x cage housing system interactions were observed and no improvement in performance resulted from housing birds in multiple bird cages according to liveweight.

scholarly journals Genetic type and growth influence on the production characteristics of light line hen hybrids

2007 ◽  
Vol 23 (5-6-2) ◽  
pp. 357-364
Author(s):  
V. Rajicic ◽  
S. Mitrovic ◽  
S. Bogosavljevic-Boskovic ◽  
J. Milivojevic ◽  
M. Staletic ◽  
...  
Keyword(s):  
Food Consumption ◽  
Body Mass ◽  
Egg Production ◽  
Laying Hen ◽  
Mass Mortality ◽  
Egg Laying ◽  
Genetic Type ◽  
Light Line ◽  
Average Consumption ◽  
Production Characteristics

The aim of this work was parallel investigation of the producing characteristics of light line hen hybrids. Investigation enclosed two hen proveniences: Hisex Brown and Shawer 579. Within the period of 19 up to 63 weeks we followed next parameters: egg-laying hen body mass, mortality, food consumption and egg-laying capacity. Hens body mass on the beginning of the examination, within the 19 weeks of growth was, for Hisex Brown provenience 1607g, and for Shawer 579 provenience 1563g. Hisex Brown provenience achieved about 250 g higher body mass on the end of investigation. During the experiment, mortality at Hisex Brown egg-laying hen was a little bit smaller (5,40%), while the Shawer 579 had 5,56% of dead hens. Globally, the mortality at both hen hybrids was in the range of technological normative. The average consumption of the food at Hisex Brown provenience was higher and it was 127,28g, and at Shawer 579 provenience 125,14g. The average consumption of the nutrition for egg production at both provenience was the same (150g).

scholarly journals Production characteristics of the copepods Arctodiaptomus salinus and Calanipeda aquaedulcis fed with a mixture of microalgae Dinophyceae and Prymnesiophyceae

2020 ◽  
Vol 5 (2) ◽  
pp. 3-11
Author(s):  
L. O. Aganesova
Keyword(s):  
Egg Production ◽  
Development Time ◽  
Survival Rates ◽  
Isochrysis Galbana ◽  
Copepod Species ◽  
Hatching Rate ◽  
Naupliar Stage ◽  
Egg Hatching ◽  
Stage Of Development ◽  
Production Characteristics

The ubiquitous copepod species Arctodiaptomus salinus (Daday, 1885) and Calanipeda aquaedulcis (Krichagin, 1873) are important components of food chains of numerous fresh- and saltwater areas. These copepods are suitable for feeding larvae of both marine and freshwater fish species; however, influence of nutrition on the production characteristics of these species is not well understood. Previously we determined that monocultures of microalgae Dinophyceae and Prymnesiophyceae are optimal feeding objects for egg production by females of A. salinus and C. aquaedulcis, survival rate, and development time of these copepods throughout ontogenesis. The aim of this work was to determine the production characteristics of copepods A. salinus and C. aquaedulcis under optimal temperature conditions depending on the model of the feeding with a mixture of microalgae Dinophyceae and Prymnesiophyceae. The highest survival rates of A. salinus from the naupliar stage to the adult one (93–95 %) were observed when copepods were fed with a monoculture of microalga Isochrysis galbana (Parke, 1949) or a mixture I. galbana + Prorocentrum cordatum (Ostenfeld) J. D. Dodge, 1975; the shortest development time (19 days) – when copepods were fed with a mixture of three microalgae I. galbana + P. cordatum + Prorocentrum micans (Ehrenberg, 1834). The shortest development time of C. aquaedulcis from the naupliar stage to the adult one (13 days) was observed when copepods were fed with a mixture of microalgae I. galbana + P. cordatum. The shortest duration of the naupliar stage of development of both copepod species was observed when their diet included I. galbana as a monoculture or one of mixture components. During the copepodit stage, the pattern remains the same, only with P. cordatum. The maximum absolute fecundity of C. aquaedulcis reached 24 eggs per female (I. galbana), of A. salinus – 16 eggs per female (P. cordatum). Egg hatching of C. aquaedulcis when being fed with both monocultures of microalgae P. cordatum and I. galbana and with their mixture reached 100 %. The highest egg hatching rate for A. salinus was reached only when copepod females were fed with a mixture of microalgae I. galbana + P. micans.

scholarly journals Evaluating Characteristics of Indigenous Chicken System with Flock Size Trends in a Participatory Research on Improved Management Practices in Kenya

2015 ◽  
Vol 3 (2) ◽  
pp. 97 ◽  
Author(s):  
Joseph Mutitu Ndegwa ◽  
Patricia Norrish ◽  
Derek Shepherd ◽  
Catherine Kimani ◽  
Anne Wachira ◽  
...  
Keyword(s):  
Egg Production ◽  
Research Team ◽  
Group Index ◽  
Flock Size ◽  
Indigenous Chicken ◽  
Feed Supplementation ◽  
Treatment Characteristics ◽  
Production Values ◽  
Significant Difference ◽  
Production Characteristics

This study investigates characteristics of indigenous chicken farms categorised on flock size patterns identified in a research involving 200 farmers in five regions in three counties (Nyandarua, Laikipia, Nakuru) in Kenya. Four villages were selected per region and10 farms in each village. Training and sensitisation meetings, introduction of intervention options (Housing, Feed Supplementation, Vaccination and Deworming), implementation by farmers, and monitoring and evaluation were carried out. The farmers used own inputs in implementing the project interventions and recorded various project activities and outputs. The project was monitored over a span of five, 3-months long periods. Variation analysis was used to identify similarities and differences between 7 farm categories (groups) based on their differences on the levels of the following factors: (1) Average farm flock sizes at five different periods (2) Treatment characteristics (interventions) application - (housing, vaccination, de-worming, and supplementation) (3) Demography characteristics (total flock additions, total flock reductions, total unplanned reductions and total controlled reduction) and (4) Production characteristics (mean hatchability and egg production per hen per cycle based on predicted egg production). Results indicate there were significant differences between the groups. Almost all the flock size differences between farm groups were significant at 1 percent level. There was a rise in differences of the between and within groups mean squares from period 1 to 5 as a result of the flock sizes levels also increasing with period. The treatment characteristics application levels had little differences between groups but housing and feed supplementation had larger values than the other two characteristics. The treatments application differences not being significant could be a consequence of influence from the research team being more or less the same in all the farms. The demography characteristics, total addition and total reduction values were close to one another among the farm categories. These together with flock size levels had little influence from the research team but were mostly a reflection of individual farm’s decision and activities. However, the production characteristics reflected more both the farmer’s action and the hen potential. The group with the lowest flock size trends had production values close to those of other groups. This would suggest that low flock size level in a farm is not a reflection of poor production dynamics. The demographic characteristics differences between farms compare well with significant levels on flock size differences between farms shown earlier, especially the total additions, total reductions and total controlled reductions. There was no single significant difference among the groups on vaccination and production characteristics – mean hatchability and egg production. Production characteristics may have been more influenced by hen factors, which may not have been different among the different farm groups. The analysis of variance made it possible to validate the flock size classification using values of dissimilarity group index between farms.

UTILIZATION OF MEAL FROM A NEW RAPESEED VARIETY, BRASSICA CAMPESTRIS CV. CANDLE, IN LAYER DIETS

1978 ◽  
Vol 58 (4) ◽  
pp. 593-596 ◽  
Author(s):  
S. J. SLINGER ◽  
J. D. SUMMERS ◽  
S. LEESON
Keyword(s):  
Crude Protein ◽  
Egg Production ◽  
Brassica Campestris ◽  
Animal Feed ◽  
Rapeseed Meal ◽  
Metabolizable Energy ◽  
Egg Weight ◽  
Rapeseed Variety ◽  
Egg Shell ◽  
Production Characteristics

A new Brassica campestris variety of rapeseed, cv. Candle, is currently being evaluated as an animal feed ingredient for use in Canada. This rapeseed has a lighter-colored seed coat and slightly less fiber than established varieties. Isocaloric (2,805 kcal metabolizable energy/kg), isonitrogenous (17% crude protein) corn–soy based mash diets were formulated to contain 0, 5, 10 or 15% Candle rapeseed meal. Each diet was offered to eight replicate groups of 12 caged commercial White Leghorn hens, Feed intake, egg production, egg weight and egg shell deformation were measured during each of ten 28-day periods of lay. Rapeseed meal had no significant (P < 0.05) effect on any of these parameters. Unlike older varieties, Candle meal did not depress egg weight when used at levels up to 10% of the diet, although at 15% inclusion there was an indication of reduced egg size. Diet had no significant (P < 0.05) effect on mortality or incidence of liver hemorrhage. From a consideration of all production characteristics, it would appear to be safe to recommend a level of 5–10% Candle rapeseed meal in diets for laying hens.

Egg production and certain behavioural characteristics and mortality pattern of indigenous chicken of India

2016 ◽  
Vol 59 ◽  
pp. 27-36
Author(s):  
P.G. Kumar ◽  
R.R. Churchil ◽  
A. Jalaludeen ◽  
K. Narayanankutty ◽  
P.A. Peethambaran ◽  
...  
Keyword(s):  
Sexual Maturity ◽  
Egg Production ◽  
Egg Mass ◽  
Indigenous Chicken ◽  
Mortality Pattern ◽  
Egg Weight ◽  
Behavioural Characteristics ◽  
Body Weights ◽  
Egg Number ◽  
Production Characteristics

Summary A survey to document the behaviour characteristics and mortality pattern of indigenous chicken of Kerala and a field egg recording study to record egg production characteristics of these birds were conducted. Flight distance and height was 13.29 and 3.97 m, respectively. The territory radius of cocks was 121.15 m. The chick survivability at 4 weeks of age was 64.98 percent. The day-old and 8th week body weights were 28.83 and 347.24 g, respectively. The 20th and 40th week body weight of males were 1,428.42 and 1,936.67 g and that of females were 1,114.04 and 1,445.63 g, respectively. The mortality up to 72 weeks was 69.38 percent and major cause of mortality during chick, grower and layer stage were mongoose (44.63 percent), wolf (24.29 percent) and diseases (52.18 percent) respectively. The fertility was 71.22 percent and hatchability on total and fertile egg set were 62.26 and 87.42 percent, respectively. There were 2.13 clutches in a laying cycle with inter-clutch intervals of 1.11 days. The average clutch size and number of eggs per cycle were 7.27 and 14.32, respectively. The egg number up to 72 weeks on hen-day and hen-housed basis was 116.81 and 85.84, respectively and the eggs were laid in 7.7 cycles. The age at first egg and average age at sexual maturity were 155 and 199.26 days, respectively. The egg weight at 28, 40 and 72 weeks of age was 37.80, 40.74 and 43.31 g, respectively, and egg mass per bird was 4,659.04 g. The broodiness and incubation pause were 26.03 and 121.75 days, respectively.

SOME POPULATION FEATURES OF REPRODUCTIVE CAPACITY IN NEODIPRION SWAINEI (HYMENOPTERA: DIPRIONIDAE)

1970 ◽  
Vol 102 (1) ◽  
pp. 68-84 ◽  
Author(s):  
L. A. Lyons
Keyword(s):  
Egg Production ◽  
Egg Size ◽  
Regression Line ◽  
Reproductive Potential ◽  
Reproductive Capacity ◽  
Single Population ◽  
Males And Females ◽  
Prolonged Diapause ◽  
Single Regression ◽  
Production Characteristics

AbstractEgg production in Neodiprion swainei may be severely reduced by food quality and quantity, tachinid parasitism, and prolonged diapause. Since these and other agents may affect the sawfly both lethally and sublethally and may operate differentially against males and females, population losses are not adequately expressed in terms of numbers of individuals. However, reduction of the potential number of eggs the population could produce provides an integrated measure of these effects. One example, from an experiment in which larvae were fed various quantities and types of foliage, demonstrates that loss of reproductive potential is several times as great as the loss of individuals and indicates that the latter seriously underestimates the importance of food in population events.Cocoon diameter and fecundity are closely related. In a Saguenay Valley population, fecundity, cocoon diameter, and deviations from the regression line were bimodally distributed, indicating a mixture of two types of individuals differing in egg production characteristics. Families within a single population differed from each other by as much as 14 eggs in the elevation of the regression line; this was more than the observed difference in elevation between populations. A single regression equation satisfactorily predicted fecundity in one Quebec and a Wisconsin population, but was unsuitable for two other Quebec populations, each of which required its own equation. Among insects of common size, mean egg length varied inversely with fecundity, but it is uncertain whether differences in egg size were responsible for variation in the fecundity-cocoon diameter relationship.

Sign in / Sign up

Export Citation Format

Share Document