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.
Results
Showing 1 to 20 of 197 for “"Hens"”.
-
TALLOW FOR LAYING HENS
… 17.0%) without and with 3% tallow were fed to hens housed in an open cage house or an insulated, evaporatively cooled house. Egg production and egg mass were significantly higher in the insulated house. This study indicates that reducing total protein below the National Research Council (NRC, …
-
Aspects of hens’ visual behaviour
… were conducted to examine different aspects of hens’ visual behaviour, and to assess whether hens respond to slide images in the same way as they respond to real conspecifics that those slides depict. Experiment 1 was a replication of a study by Candland (1969). Six domestic hens were trained to …
-
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 …
-
Visual discrimination and object/picture recognition in hens
… of hen’s visual behaviour, and to assess whether hens responded to photographs in the same way they do to the real objects that were depicted in the photographs. In Experiment 1, six hens were trained to perform either a conditional discrimination (successive) or forced-choice discrimination …
-
Studies of the Mechanism of Ovulation in Hens
Made available in DSpace on 2014-12-10T22:30:24Z (GMT). No. of bitstreams: 1 7219859.pdf: 3732397 bytes, checksum: d0367cee2a66a199628419a5a4928616 (MD5) Previous issue date: 1972
-
In Vitro Steroidogenesis by Ovarian Follicular Cells of Hens
Made available in DSpace on 2014-12-13T19:42:47Z (GMT). No. of bitstreams: 1 7820971.pdf: 5289575 bytes, checksum: 00da2b0faa6b1c140f7591bdb41bf89f (MD5) Previous issue date: 1978
-
Factors Affecting Follicular Growth and Ovulation in Hypophysectomized Hens
Made available in DSpace on 2014-12-05T17:47:46Z (GMT). No. of bitstreams: 1 6100182.pdf: 3809002 bytes, checksum: 4827f5295f061aa34c983e6dfcce9d50 (MD5) Previous issue date: 1960
-
Variables controlling the resurgence of previously reinforced behaviour in hens
… were investigated. All experiments used hens and behaviours were selected from door push, key peck, and head bob. In Experiment 1, using 6 naive hens, Behaviour 1 was reinforced on a random-interval (RI) 60-s schedule followed by two sessions of extinction. Each occurrence of Behaviour 2 …
-
Pheasant Production Using Wild Cocks and Penned Game-Farm Hens
… free-flying wild cooks and penned game-farm hens was evaluated during 1971. Hens were placed in 0.5-acre pens to compare production at density levels of 10, 20, and 40 hens per acre. Wild cooks entered the 0.5-acre pens the day following introduction of the game-farm hens. The greatest …
-
Dieldrin Residues In Eggs and Fat of Penned Pheasant Hens
At present, there is considerable interest in the effects of insecticides upon our wildlife populations. It is well known that chlorinated hydrocarbon insecticides are present in tissues and eggs of birds that receive these chemicals in their diets. Some workers, for example Gene11y and Rudd (1956) …
-
Reproductive ecology of Eastern wild turkey hens in Sussex County Delaware
… the reproduction success of Eastern wild turkey hens (Melagris gallopavo silvestris). I captured 106 turkeys using rocket nets and placed backpack transmitters on 76 hens in December 2009-March 2010 and December 2010-March 2011. I classified each bird as adult or juvenile, marked them with unique …
-
Conductive cooling and the metabolism of chicken hens in hot environments
… in the alleviation of heat stress in chicken hens. In the first study, roost preferences and behavioral roosting for thermoregulation purposes were tested. Data on roost use were obtained from time-lapse videotapings. Chicken hens selected square and round-shaped roosts equally (P $\leq$ …
-
Ultrastructural analyses of uterovaginal sperm storage glands of turkey breeder hens
… the uterovaginal sperm storage glands of turkey hens was characterized. The ultrastructural morphology of these cells was monitored over an entire egg laying season. In addition, comparisons were made between glands from fertile and infertile hens. Based on ultrastructural observations, it was …
-
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 and …
-
Associations of egg production with the major histocompatibility complex in broiler breeder hens
… traits in a flock of Cobb X Cobb broiler breeder hens. The objective was to determine if the MHC affects reproduction of non-congenic broiler breeder hens. Genomic DNA was isolated from 35 hens. Restriction fragment length polymorphism (RFLP) analysis was performed on each sample, using a chicken …
-
Brood-rearing Period Cover Use By Wild Turkey Hens in Southcentral South Dakota
… cover use by wild turkey (Meleagris gallopavo) hens with broods and those without, in Gregory County, South Dakota, was determined in order to formulate management suggestions for grassland/riparian woodland habitat. Two hens with broods and 12 hens without broods were studies through telemetry …
-
Enriching Eggs of Laying Hens with Multiple Bioactive Nutrients for Improving Human Health
… 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. When these …
-
Avian leukosis virus as a risk factor for ovarian adenocarcinoma in layer hens
… adenocarcinoma (OAC) occurs spontaneously in hens, as in women, and increases in prevalence with age. Ovarian adenocarcinoma in women and hens have similar histologic features, biomarker staining and epidemiological characteristics. Recently, human endogenous retroviruses (HERVs) have been …
Page 1 of 10