Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"laying hens"”.
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TALLOW FOR LAYING HENS
… and minimal amino acid utilization in the laying hen were studied in two experiments. In the first experiment diets contained six levels of animal tallow ranging from 0 to 10%. Percent egg production and egg mass were not significantly affected by tallow. Body weight was significantly …
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Alternate Housing for Laying Hens
A housing system for laying hens was designed to incorporate advantages found in battery cage and aviary housing systems. This includes separation from fecal matter, increased horizontal space per bird over commercial battery housing, space for vertical movements, a small group number, perches and …
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Behavior, welfare, production and bioenergetics of laying hens in alternative housing systems
… welfare, production, and bioenergetics of laying hens in alternative housing systems. It covers five experiments that were conducted in controlled environment and commercial settings with the following specific objectives: 1) Develop and validate a UHF RFID system able to evaluate nesting …
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Enriching Eggs of Laying Hens with Multiple Bioactive Nutrients for Improving Human Health
… studies by our group have demonstrated that laying hens are capable of enriching into their eggs health promoting compounds including a potent antioxidant astaxanthin (AST), the long chain omega-3 fatty acid docosahexaenoic acid (DHA), and the pre-activated form of vitamin D3 calcifediol. …
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Efficacy of new phytase enzymes for increasing dietary phosphorus utilization by laying hens
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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PROSTAGLANDIN E2 PATHWAY AS A TARGET TO PREVENT AND TREAT OVARIAN CANCER IN LAYING HENS
… chemo-prevention strategies. The domestic hens spontaneously develop ovarian adenocarcinomas that share similar histological appearance and symptoms such as ascites and metastasis with humans. Our first objective was to investigate the effect of flaxseed supplementation for one year on …
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Happy Chickens: Novel Physiological and Behavioral Measures of Cumulative Experience in Broilers and Laying Hens
… environments for broiler chickens and commercial laying hens are often barren, high-density environments with an emphasis on production efficiency. These housing conditions limit birds' ability to display species-specific behaviors, can negatively impact health, and may contribute to negative …
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Production and health responses of laying hens and growing broilers to dietary omega-3 fatty acid supplementation
… were used to pursue the overarching goal: aged hens with mature immune systems at risk of osteoporosis and growing broilers with naïve immune systems prone to leg bone pathology. The experimental objectives of this dissertation were as follows: 1) Evaluate how dietary ALA sources affect the …
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Determining the digestible lysine requirement of 22 to 47 week-old Lohmann laying hens using two requirement titration methodologies
… to obtain higher egg production for commercial laying hens. In addition to genetic progress, there have been substantial changes in environmental management, cage density and feed ingredient quality. These changes have resulted in more efficient bird, and there is evidence that their nutrient …
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Nutritional evaluation of canola meal produced from a new variety of canola seeds in broiler chickens and laying hens
… assays, two broiler chicken experiments and one laying hen experiment were conducted. The four precision-fed rooster assays were used to determine the values of MEn using conventional roosters and ileal digestible amino acid values using cecectomized roosters. The first experiment evaluated a …
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Effects of feeding diets varying in nutrient density to Hy-Line W-36 laying hens on production performance and profitability
An experiment was conducted with 480 Hy-Line W-36 laying hens to determine whether feeding diets that varied in nutrient density would affect long-term egg production performance. At 18 wk of age, laying hens were weighed and randomly allocated to 6 replicate groups of 16 hens each (2 adjacent …
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Assessment of behaviour and egg production of laying hens kept in cages and floor systems on a commercial farm in South Africa
… E, over an 8-week period using Lohmann Brown laying hens at different ages and in different housing systems with different stocking densities. The study assessed the behaviour and production parameters of laying hens kept in cages and floor systems during daytime hours (7:00 AM to 3:00 PM), …
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Further Evaluation of the Available Phosphorus Requirement of Laying Hens and Methods for Improving the Availability of Phosphorus in Feedstuffs for Poultry
A final laying hen experiment was conducted to evaluate the efficacy of phytase for increasing amino acid utilization of three different laying hen diets. The results indicated that 300 units phytase/kg did not improve amino acid digestibility in laying hen diets containing corn, soybean meal, meat …
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The effect of modification of mixed function oxidases and inhibition of enterohepatic circulation on concentration of estrogens in plasma in laying hens (Gallus domesticus)
… estrogens and on estrogen dependent functions in laying hens (Gallus domesticus).
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Evaluation of feeding different sources and levels of distillers dried grains with solubles (DDGS) with corn and soybean hulls in non-feed-withdrawal molt programs for laying hens
Two studies were conducted to evaluate if laying hens can be successfully molted by ad libitum feeding various levels and sources of DDGS. In the first study, three sources of DDGS varied greatly in color. Treatment 1 consisted of a 47% corn (C):47% soy hulls (SH) molt diet (C:SH) fed for 28 d …
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The Acute and Chronic Effects of a Cyclic Heat Stress on 24 to 28 Week Old Laying Hens on Performance, Egg Quality, Apparent Metabolizable Energy, and Blood Chemistry
Commercial laying hens are heavily selected for increased egg production, but little selection has occurred for resistance to extreme temperatures. The objective of the experiment was to determine the effects of a daily cyclic heat stress (HS) on performance, body temperature, egg quality, nitrogen …
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MONITORIAMENTO DE SALMONELOSE EM AVES DE PRODUÇÃO, ULTILIZANDO O MÉTODO DE SOROAGLUTINAÇÃO RÁPIDA EM PLACA
… Pullorum and Salmonella Gallinarum in 150 laying hens belonging to Hy Line (110 birds) and Dekalb brown (40 birds) and 150 broilers (Cobb line) housed in the poultry sector of the Department of Animal Science, Federal University of Paraíba - CCA - Areia - PB. As a serological screening …
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