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Evaluating Draft Epa Emissions Models For Laying Hen Facilities, Yijie Xiong, Guoming Li, Brett C. Ramirez, Robert T. Burns, Richard S. Gates

Department of Animal Science: Faculty Publications

In August 2021, the U.S. Environmental Protection Agency (EPA) released draft models to estimate daily NH₃, H₂S, PM₁₀, PM_2.5, and TSP emissions from egg-layer houses (high-rise and manure-belt) and manure storage using inputs of daily mean ambient temperature, relative humidity (RH), and hen inventory. These models were developed from refined datasets generated by the National Air Emissions Monitoring Study fieldwork completed in 2009. Notably, they do not include data for cage-free housing. Currently, 66% of U.S. laying hens are housed in cages; thus, these models, if adopted, will have a substantial impact …

Use Of Amino Acid Isotope Analysis To Investigate Capital Versus Income Breeding Strategies In Migratory Avian Species, Nico Lübcker, John P. Whiteman, Oliver N. Shipley, Keith A. Hobson, Seth D. Newsome

Biological Sciences Faculty Publications

1. Income and capital breeding represent opposing ends of a continuum of reproductive strategies. Quantifying nutrient allocation to reproduction is challenging, but recent advances in compound-specific stable isotope analysis hold promise for tracing the source of individual compounds allocated to reproduction.

2. Here, we describe a novel approach of using measured carbon (δ13C) and nitrogen (δ15N) isotope values of individual amino acids (AAs) in pectoral muscle of egg-laying females and egg yolk as a useful tool to quantify the reliance on income versus capital breeding in migrating species. We used white-fronted (Anser albifrons frontalis), lesser snow (A. …

Effect Of Eggshell Temperatures On Hatching Performance, Egg Production, And Bonemorphology Of Laying Hens, Serdar Kamanli, Zi̇şan Servet Yalçin, Ahmet Nuri̇ Taşdemi̇r, Bülent Tarim, Engi̇n Tülek, Hüseyi̇n Aygören, Öğünç Meral, Bi̇rkan Karsli, Tansel Ansal Balci, Mehmet Bozkurt

Turkish Journal of Veterinary & Animal Sciences

The present study aims to evaluate the effect of lower or higher eggshell temperatures from days 7 to 21 on hatching performance, bone and blood parameters, and egg production along with the age of laying chickens. A total of 3150 eggs obtained from a white egg-type breeder were divided randomly into 3 groups of 1050 eggs. From 7 to 21 days, eggs were incubated at one of three eggshell temperatures: Control (IC) 37.5 °C, low (IL) 36.9 °C, and high (IH) 38.5 °C. At hatch, chicks were weighed, and blood was collected to measure total Ca, inorganic P, and ALP …

Effects Of Using Processed Barley And Supplemented Multi-Enzymes In Laying Hen Rations On Egg Production, Egg Quality And Egg Fatty Acids, Yavuz Gürbüz, Osman Özyürür

Turkish Journal of Veterinary & Animal Sciences

In this study, we have observed different technological processes, which are commonly used in poultry production. Rations contained different amounts of barley and multi-enzyme, egg weight, egg mass, egg yield, feed intake, egg weight. The rations of the control groups were as follows: 0% barley (based of corn) (K), 15% untreated barley (A1), 15% pellet barley (A2), 15% flaked barley (A3), 30% untreated barley (A4), 30% pelleted barley (A5), 30% flaked barley (A6), 30% untreated barley + enzyme (0. 025%) (A7). In the research, 64 brown laying hens ATAK-S for 36 weeks were divided into 8 different treatments for egg …

Effect Of Housing Environment And Laying Hen Strain On Performance, Egg Quality And Bone Properties As Well As Cloacal And Eggshell Microbiology, Milan Kumar Sharma

Theses and Dissertations

Laying hen welfare is gaining importance in the United States and several states have passed legislation for a welfareriendly housing environment, which has forced the egg industry to explore alternative housing environments. For this reason, our first objective was to determine the effect of housing environment and laying hen strain on production performance and egg quality. Results showed that production performance of the hens raised in the alternative housing system was similar to the conventional system. The second objective was to compare the eggshell and cloacal microbiology. Our results indicated that the microbial load observed was higher in the alternative …

Production And Egg Quality Traits Of Organic Hens In A Laying Period Under Commercialconditions In Turkey, Onur Saribaş, Umut Sami̇ Yamak

Turkish Journal of Veterinary & Animal Sciences

The productive performance and egg quality traits of hens in an organic production system in Turkey were executed in this paper. A total of 6000 hens were reared in an organic system for 72 weeks. Two organic certified houses each with a capacity of 3000 hens were used in the study. Mean egg production during the laying period was 303 eggs per hen. Laying rate was 80.24% for 72 weeks, while mortality was 8.85%. The internal and external egg quality traits were determined between 25 and 72 weeks. Mean egg weight was 63.03 g and shell thickness was 0.35 mm. …

Size At Maturation, Spawning Variability And Fecundity In The Queen Conch, Aliger Gigas, Richard S. Appeldoorn

Gulf and Caribbean Research

The queen conch (Aliger gigas) resource is one of the most important in the Caribbean. While aspects of queen conch reproduction have been studied, e.g., size—at—maturity, spawning season, and density—based Allee effects, there is little information on other important aspects. From 210 lipped queen conch collected off southwest Puerto Rico, histological examination of gonads showed that 50% maturation occurred at 9 mm lip thickness. Experimental caged queen conch held on a natural spawning ground were monitored across the spawning season to evaluate fecundity and its variability across individuals and between nominal density treatments (2,000 vs 143 conch/ha). Near …

Laying Performance Of Pearl Gray Guinea Fowl Hens As Affected By Caging Density, Samuel N. Nahashon, Nathaniel Adefope, Abravi Amenyenu, D. Wright

Agricultural and Environmental Sciences Faculty Research

The caging density required for optimal egg production by various avian species and varieties is highly variable. Even so, little is known of the required cage density for optimum performance of the laying guinea fowl (Numida meleagris). The objective of this study was to assess the effect of varying cage densities on production performance of pearl gray guinea fowl laying hens. In 3 replicates, 270 pearl gray guinea hens [28 wk of age (WOA)] were weighed individually and randomly assigned to laying cages at densities of 1, 2, and 3 birds/cage, equivalent to 1,394, 697, and 465 cm2/bird, respectively. During …

Effect Of Cooled Perches On The Efficacy Of An Induced Molt In White Leghorn Laying Hens Previously Exposed To Heat Stress, J Y. Hu, P Y. Hester, Y Xiong, R S. Gates, M M. Makagon, H W. Cheng

Department of Animal Science: Faculty Publications

This study examined the effect of water chilled perches on hen production and physiological responses to induced molt during elevated temperatures. A total of 288White Leghorns at 82 wk of age were housed in 36 cages of 6 banks. Each bank was assigned to 1 of 3 treatments: cooled perches, air perches, and no perches. The hens were subjected to 2 heat episodes during their first laying cycle at week 21 to 35 and week 73 to 80, respectively. The hens were subjected to a 28 D nonfasted molting regimen starting at 85 wk of age. Cyclic heat of 32◦C …

Effect Of Cooled Perches On Performance, Plumage Condition, And Foot Health Of Caged White Leghorn Hens Exposed To Cyclic Heat, J Y. Hu, P Y. Hester, M M. Makagon, Y Xiong, R S. Gates, H W. Cheng

Department of Animal Science: Faculty Publications

We examined the effects of water-chilled perches as cooling devices on hen performance during 2 summers using daily cyclic heat. White Leghorns, 17 wk of age, were assigned to 36 cages arranged into 6 banks. The banks were assigned to cooled perches, air perches, and no perches resulting in 2 replicate banks and 12 cages per treatment. Chilled water (10^◦C) was circulated through the cooled perches during heat episodes. Daily cyclic heat of 35^◦C was applied from 0600 to1800 h with a lowering of temperature to 28^◦C from 1800 to 0600 h during the …

Effect Of Adding Tributyrin In Diet On Egg Production, Egg Quality, And Gastrointestinal Tract In Laying Hens After Peak Period, Jessada Sakdee, Theerawit Poeikhampha, Choawit Rakangthong, Kanokporn Poungpong, Chaiyapoom Bunchasak

The Thai Journal of Veterinary Medicine

This study was conducted to evaluate the effects of supplementing diet with tributyrin on productive performance, egg quality and gastrointestinal tract of laying hens during the post-peak period of egg production. In total, 384 Lohmann Brown-Classic hens aged 56 weeks were used for the 16-week experiment. The hens were divided into two groups, each group consisting of 8 replications of 24 hens each. Experimental diets were supplemented with tributyrin at the level of 0.00% (control diet) and 0.05%. Tributyrin supplementation significantly increased eggshell thickness (P<0.01) and tended to increase eggshell weight (P=0.07). However, it had no significant effect on production performance, pH in each part of the gastrointestinal tract, small intestinal morphology, populations of E. coli and Lactobacillus spp. and short chain fatty acids concentrated in the caecum of laying hens. It was concluded that tributyrin supplementation in the diet improved the eggshell thickness after the peak rate of lay, although significant effects on egg production and the gastrointestinal tract were not observed.

Population Dynamics Of The Copepod Invader Oithona Davisae In The Black Sea, Leonid Svetlichny, Elena Hubareva, Melek İşi̇ni̇bi̇li̇r Okyar

Turkish Journal of Zoology

During 2013-2016 in Sevastopol Bay, seasonal and interannual dynamics of the population density, age and sex composition, fecundity, and mortality of males and females of Oithona davisae were studied. A maximum population number (up to 554 ind × 10$^{3}$ m$^{-3}$) was registered at the end of summer?end of autumn. In this period, the nauplii and early copepodite stages constituted up to 95% of the Oithona davisae population. During 1-2.5 cold winter?spring months, the population consisted only of females, who were not numerous. The phase of latent population development was recorded from April until July-August, with a high share of ovigerous …

Egg Production, Egg Quality, And Cecal Microbial Populations Of Layersfed Diets Supplemented With Fermented Phytogenic Feed Additive, Jae Hong Park, Tae Hwa Song, Inho Kim

Turkish Journal of Veterinary & Animal Sciences

This study was undertaken to examine the effect of fermented phytogenic feed additive (FPFA) containing Gynura procumbens and Rehmannia glutinosa on egg production, egg quality, and cecal microflora population in layers. In total, 288 Hy-Line brown layers were randomly divided into 4 dietary treatment groups with 6 replicate pens per treatment group for 5 weeks. The dietary treatments were the control group (CON; basal diet without FPFA), FPFA1 (CON + 0.5% FPFA), FPFA2 (CON + 1% FPFA), and FPFA3 (CON + 2% FPFA). Egg production and egg weight during the experiment (35-39 weeks) improved linearly with the supplementation of 1% …

Circulating Metabolic And Reproductive Hormone Changes In Laying Hens Kept Under Various Heat-Combating Systems, Muhammad Safdar Anjum, Mansur Abdullah Sandhu, Zia Ur-Rahman, Anum Safdar

Turkish Journal of Veterinary & Animal Sciences

The objective of the present study was to observe the circulating metabolic, reproductive, and stress hormones in laying hen performance under different heat-combating systems (HCSs). A total of 500 White Leghorn pullets at 24 weeks of age were subjected to four HCSs, i.e. desert cooling (DC), water sprinkling (WS), time limit feeding (TLF), and ascorbic acid (AA) supplementation, at environmental temperatures from 32.30 to 40.80 °C with 76.40% relative humidity. Blood was collected before heat stress, at peak stress, and after heat stress to collect plasma. The results of the 24-week stress period showed significantly less circulating T3, T4, estrogen, …

A Comparison Of The Welfare Of Hens In Battery Cages And Alternative Systems, Sara Shields, Ian J.H. Duncan

Sara Shields, PhD

Housing systems for egg-laying hens range from small, pasture-based flocks to large, commercial-scale operations that intensively confine tens of thousands of hens indoors. The overwhelming majority of laying hens used for commercial egg production in the United States are confined in battery cages and provided 432.3 cm2 (67 in2) of space per bird. Cages prevent hens from performing the bulk of their natural behavior, including nesting, perching, dustbathing, scratching, foraging, exercising, running, jumping, flying, stretching, wingflapping, and freely walking. Cages also lead to severe disuse osteoporosis due to lack of exercise. Alternative, cage-free systems allow hens to move freely through …

The Effect Of Processing Method Of Distiller's Dried Grains With Solubles On Hen Egg Production, Egg Quality, And Yolk Color, Lindsay Renee Brunet

LSU Master's Theses

Distiller’s dried grains with solubles (DDGS) is a common byproduct of the ethanol industry and is used in animal feeds. Carotenoids (xanthophylls) are already present in the human eye, and increasing the amount of carotenoids in the eye can help prevent eye diseases. The purpose of this research was to confirm that adding DDGS to standard corn and soybean meal hen diets may increase the amount of lutein available in egg yolks. An experiment was conducted with Hy-Line W-36 hens to evaluate the effects of DDGS in corn-soybean meal diets. Three hundred fifteen hens were fed one of seven treatment …

An Hsi Fact Sheet: Biosecurity Challenges Of Industrial Farm Animal Production, Humane Society International

HSI FACT SHEETS

Industrial farm animal production (IFAP) has become increasingly common throughout the world. Worldwide, industrial systems now account for approximately two-thirds of poultry meat production and half of egg and pig meat production, with developing countries already producing approximately half of the world’s industrial pork and poultry by 2006.

Inherent design and operational requirements of IFAP facilities can create biosecurity problems with both bioexclusion and biocontainment—efforts to prevent the respective influx and efflux of pathogens. These may help explain why large commercial flocks may be up to 10,000 times more likely to report outbreaks with pathogens such as highly pathogenic avian …

Seasonal Variations In Body Length And Fecundity Of 2 Copepod Species: Thermocyclops Crassus (Fischer, 1853) And Eudiaptomus Drieschi (Poppe & Mrázek, 1895), Ahmet Bozkurt, Mehmet Fati̇h Can

Turkish Journal of Zoology

The effects of temperature, dissolved oxygen, nitrate, phosphate, and chlorophyll-\alpha concentration on the body length and egg production of a cyclopoid copepod, Thermocyclops crassus, and a calanoid, Eudiaptomus drieschi, were evaluated. Sampling was conducted in Yenişehir Lake (Hatay, Turkey) on a monthly basis between May 2003 and April 2004. The results of the present study showed that, among the parameters considered, temperature and chlorophyll-\alpha concentration were the main parameters influencing the body length of T. crassus and E. drieschi in Yenişehir Lake. For E. drieschi, egg production was also affected by chlorophyll-\alpha levels.

The Effect Of Calcium And Nonphytate Phosphorus On Chicken Genetic Line, Egg Production, Shell Quality, Bone Homeostasis, And Progeny Bone Quality, Phiphob Sodsee

Graduate Theses and Dissertations

The study consisted of two parts to determine effects of dietary calcium (Ca) and nonphytate phosphorus (NPP) level on four pure genetic lines of broiler breeders. The first part was concentrated on body composition, egg production and shell quality changes according to diet and genetic line. The second part was the study of bone homeostasis variables combining hematology, bone histology and body composition changes according to diet and genetic line. In the study, pullets (246 from each of pure genetic line A, B, C and D) were individually caged and light stimulated at 21 weeks of age. The study duration …

Top 10 Global Producers (2012): Hen Eggs, Humane Society International

HSI DATA SHEETS

No abstract provided.

Complying With Proposition 2 Chore-Time Modular Belt Cage System Modifications And The Effects, Angela Coelho, Andrew Demler

Agribusiness

The California poultry industry is at a turning point due to the approaching deadline of Proposition 2 taking effect in 2015. The method of choice to be implemented to stay in business is called an enriched colony cage system. This system is very popular in E.U production, however has yet to be implemented in the United States. Thus, for the purpose of this project the modification of Chore Time® equipment at the Cal Poly poultry unit to resemble colony cages was the taken approach.

The fiscal impact the new law will have on California egg farmers can only be estimated. …

Understanding Mortality Rates Of Laying Hens In Cage-Free Egg Production Systems, The Humane Society Of The United States

Agribusiness Collection

In cage-free egg production systems, concerns have been raised over hen mortality rates. High mortality is an obvious indicator of poor welfare, and problems should be addressed without delay. It is important to note, however, that mortality can vary substantially between hen flocks, and that some cage-free systems have healthy flocks that do not suffer substantial death losses. These systems can serve as models for the rest of the industry, since mortality is not inherent to any particular system, but a consequence of how well the system is managed.

An Hsi Report: Food Safety And Cage Egg Production, Humane Society International

HSI REPORTS

Governments have begun legislating against cage egg production and a growing number of major food retailers, restaurant chains, and foodservice providers worldwide are switching to cage-free eggs. Extensive scientific evidence strongly suggests this trend will improve food safety. All fifteen scientific studies published in the last five years comparing Salmonella contamination between caged and cage-free operations found that those confining hens in cages had higher rates of Salmonella, a leading cause of food poisoning worldwide. This has led prominent consumer advocacy organizations, such as the Center for Food Safety, to oppose the use of cages to confine egg-laying hens.

An Hsi Report: Adopting A Cage-Free Production Policy For Animal Products In Brazil, Humane Society International

HSI REPORTS

Farm animal welfare is becoming an important concern for governments, producers, and consumers worldwide. In particular, intensive confinement systems, such as battery cages and gestation crates, have been acknowledged as severely impairing to the physical comfort and expression of natural behaviors of animals. The European Union and select states in the United States have already passed bills eliminating these housing systems over the next several years. Numerous international retail and food production companies, including Burger King (North America), Smithfield Foods, and McDonald’s (Europe) are committed to gradually eliminating the use and sale of eggs and pork produced via intensive confinement …

Effect Of Amino Acid Formulation And Dietary Direct-Fed Microbial Supplementation On Egg Production And Egg Characteristics In Laying Hens, T. J. Applegate, E. M. Onyango, R. Angel, W. J. Powers

ETSU Faculty Works

An experiment was conducted to determine whether direct-fed microbial supplementation could alleviate a marginal amino acid (AA) deficiency in Hyline 36 laying hens from 33 to 44 wk of age. The experiment was a 2 × 4 factorial design with or without a commercial directfed microbial (Primilac; 1.36 kg/1,000 kg) and 4 levels of AA formulation. Egg characteristics (yolk, albumen, or shell proportions and yolk or albumen solids) were not affected by diet. Primilac supplementation had no effect on egg production or egg mass. However, Primilac supplementation reduced feed intake-to-egg mass ratio by 2.4 and 3.4% from 33 to 36 …

Fisheries Research Report No. 193 - Investigating Reproductive Biology Issues Relevant To Managing The Western Rock Lobster Broodstock, Roy Melville-Smith, Simon De Lestang, N Beale, D Groth, A Thompson

Fisheries research reports

Final FRDC Report – Project 2003/005

Objectives:

1. To investigate the implications of the setose and maximum size rules.

2. To undertake preliminary investigations into the implications of egg diameters being significantly smaller at the Abrolhos Islands than at the coast.

3. To quantify the extent of the breeding grounds, so as to weight the overall egg production index for the stock by the contribution of the management zones.

Increases in efficiency due to modern electronic equipment, improved fishing vessels and knowledge about the grounds and lobster behaviour, have all led to western rock lobster fishers becoming more efficient at …

An Hsi Report: Human Health Implications Of Intensive Poultry Production And Avian Influenza, Humane Society International

HSI REPORTS

The high stocking density, stress, unhygienic conditions, lack of sunlight, and breeding practices typical of industrial poultry and egg production systems may facilitate the emergence and spread of diseases, including highly pathogenic avian influenza viruses with public health implications such as H5N1.

Effects Of Dietary Boric Acid Supplementation On Performance, Eggshell Quality And Some Serum Parameters In Aged Laying Hens, Derya Yeşi̇lbağ, Mustafa Eren

Turkish Journal of Veterinary & Animal Sciences

The effects of dietary boric acid (BA) supplementation on feed consumption, feed efficiency, egg production, egg weight, eggshell thickness, eggshell breaking strength, and some serum parameters (Ca, P, and Mg) were examined in 100 layer hens at 60 weeks of age. Commercial corn-soy-based layer diets were formulated as basal diets for the control treatment. Basal diets were supplemented with 25, 50, and 100 mg/kg BA (H_3BO_3), respectively, in experimental groups I, II, and III. In total, 4 dietary treatments were employed in the experiment. The experiment lasted 75 days. Feed efficiency and egg production values were not affected significantly by …

Comparison Of The Functional And Numerical Responses Of Resistant Versus Non-Resistant Populations Of The Copepod Acartia Hudsonica Fed The Toxic Dinoflagellate Alexandrium Tamarense, Sean Colin, Hans G. Dam

Arts & Sciences Faculty Publications

The functional and numerical responses of grazers are key pieces of information in predicting and modeling predator–prey interactions. It has been demonstrated that exposure to toxic algae can lead to evolved resistance in grazer populations. However, the influence of resistance on the functional and numerical response of grazers has not been studied to date. Here, we compared the functional and numerical responses of populations of the copepod Acartia hudsonica that vary in their degree of resistance to the toxic dinoflagellate Alexandrium tamarense. In common environment experiments carried out after populations had been grown under identical conditions for several generations, …

Laboratory Environment Effects On The Reproduction And Mortality Of Adult Screwworm (Diptera: Calliphoridae), Dennis Berkebile, Agustin Sagel, Steven R. Skoda, John E. Foster

Department of Entomology: Faculty Publications

The New World screwworm, Cochliomyia hominivorax Coquerel, is mass reared for screwworm eradication initiatives that use the sterile insect technique. New methods for rearing have helped to reduce the cost of the eradication program. We examined the effect and interaction of three temperatures (24.5, 29.5 and 34.5ºC), two diets (2% spray-dried blood plus 0.05% vitamins and corn syrup carrageenan) and three population densities (300, 400, and 500 flies/cage) on egg production, egg hatch, number of observable fertilized eggs, mortality (male and female) and ovarian development. The three population densities did not affect any of the parameters monitored. Using the protein …