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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 21 for “"Breeding Period"”.
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Seasonal Reproductive Changes in Cryptobranchus Alleganiensis
… weight of the testes were maximal by mid-July. Breeding occurred from mid-September through early October. The testes had regressed by October. Spermatogonia occupied the regressed testes from October through June. Vitellogenic activity was greatest from May through mid-September. Absolute and …
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Melengestrol acetate and norgestomet for the induction of synchronized estrus in seasonally anovular ewes
… blood serum progesterone concentration) of mixed breeding were randomly assigned within broad age groups to one of seven treatments: 1) control (C); 2) MGA only (OMGA); 3) MGA + zeranol (RMGA); 4) MGA + PG-600 (PMGA; 400 IU pregnant mare's serum gonadotropin + 200 IU human chorionic gonadotropin …
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Flight feather moult patterns and stable isotope analysis in the Woodland Kingfisher
… cycle that includes two migrations between the breeding and non-breeding grounds, the renewal of feathers and reproduction. All the mentioned processes are energetically expensive and they need special physiological adaptations. I investigated the timing of moult by actively catching Woodland …
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Effects of Diethylstilbestrol on Reproduction in the Black-Tailed Prairie Dog
… of 14 known day-old young to learn the peak breeding period when an estrogenic chemosterilant would be most effective. Conception dates were obtained for three females by backdating the gestation period. The breeding peak was found to occur in late February and early March in South Dakota. …
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Survival and habitat use of the Kirtland’s Warbler in the breeding and post-breeding periods
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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Water and energy balance in the Namib sand-dune lizard, Angolosaurus skoogi
… skoogi, was measured during the summer non-breeding period (early January) by means of doubly labelled water. FMR was about half that expected for a lizard of this size. Water flux and laboratory measured standard metabolic rates were, however, typical of other desert lizards. It thus …
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Distribution and Landscape Attributes of Greater Prairie Chickens and Sharp-Tailed Grouse Outside of Their Traditional Range in South Dakota
… ending 2 to 2½ hours after sunrise during the breeding period of mid-March to early June of each year, with listening points established at 1.6 km (1 mile) intervals. Leks were located and recorded. All land and land-uses within 3,000 m of identified leks and randomly selected non-use points …
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Fine-scale movements and habitat use of the Southern Ground Hornbill Bucorvus Leadbeateri
… and were larger in winter than during the summer breeding season. Daily travel distances were greater during the breeding season, when birds were constrained to forage close to their nest, and were lower in winter, when birds ranged more widely. Hourly travel distances were affected by time of …
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The effect of nicotine on carrion feeding insects with considerations for use within forensic sciences
… record of the Soldierfly Sargus bipunctatus breeding in carrion; the late breeding period of this species and its significance to the forensic entomologist is considered. The experiments were conducted in the Autumn/Winter months and Spring/Summer months. Nicotine appeared to have a differing …
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Using Commercially Available Hormones to Enhance Swine Reproductive Efficiency in Batch Management Systems
… about a variety of management systems for breeding herds, including batch farrowing. In this system, groups of sows are weaned in 2- to 5- week intervals, making estrus synchronization of new gilts and sows critical to maintaining reproductive efficiency in the herd. The use of commercially …
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Comparative ecology of Pachyptila species breeding sympatrically at Gough Island
… the presence of two very similar prion species breeding sympatrically, approximately three months apart, on Gough Island: Pachyptila vittata and P. macgillivrayi. This discovery raised several questions about the ecological segregation of these species. My thesis compares the breeding …
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The Effects of Artificial Photoperiod on Age at Puberty in Fall-born Ewe Lambs
… examined the effects of an artificial photoperiod on puberty in fall-born ewe lambs. Replicate I was initiated in December 2011 with prepubertal Dorset ewe lambs (n = 44). Replicate II was initiated beginning in December 2012 and included prepubertal Dorset, Suffolk x Dorset and Texel x …
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Investigating the foraging ecology and energy requirements of a seabird population increasing in an intensely exploited marine environment
… in their diet and energetic expenditure during breeding. Populations of the three seabirds endemic to southern Africa's Benguela upwelling ecosystem that rely on small pelagic fish have decreased dramatically over the last decade. In contrast, the population of the greater crested tern …
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A mechanistic approach to understanding the colour polymorphism in black sparrowhawks (Accipiter melanoleucus)
… morphs under these conditions. During the winter breeding period, the predominating low light conditions on the Cape Peninsula (Western Cape, South Africa) could create an advantage for dark morphs, which should result in their higher survival and higher breeding success. However, this is not the …
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Woody cover and birds
… and occur to a large extent during their non-breeding period within the savanna biome of South Africa. For each species, the extent of increase in relative abundance between the first and second bird atlas projects in the region (SABAP1 and SABAP2) is estimated. In most cases, the change of …
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Assessing the effect of feather wear on carbon and nitrogen stable isotope ratios, and the use of stable isotopes to determine predator diets in the Namibian Islands marine protected area
… Protected Area supports the most important breeding population of bank cormorants (Phalacrocorax neglectus; Endangered), and historically was important for two other Endangered seabirds: African penguins and Cape gannets (Morus capensis). Non-threatened marine top predators studied in the …
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La riproduzione dei condroitti come elemento chiave per la loro conservazione e gestione nel Mediterraneo centro-occidentale
… the pregnant phases. The determination of the breeding season is the key for a proper management. Among the oviparous species studied, D. oxyrinchus and G. melastomus showed an extended reproductive period with one and two peaks respectively during the year. A reproductive cycle limited to …
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FACTORS INFLUENCING THE SPATIAL AND TEMPORAL STRUCTURE OF A CARNIVORE GUILD IN THE CENTRAL HARDWOOD REGION
… and coyote populations during the same time period is the cause. I conducted a large-scale non-invasive carnivore survey using an occupancy modeling framework to quantify factors affecting the structure of this widely-occurring carnivore guild. I used baited remote cameras during 3-week …
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Impact of early postpartum uterine disease (metritis) on the functional regeneration of endometrial glands in lactating dairy cows
… as optimal reproductive performance during the breeding period at later postpartum stages (Lucy, 2019; Sheldon et al., 2019). Amongst these events is the process of uterine involution, which is characterized by the functional reestablishment of the uterus to support subsequent pregnancies (Buch …
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Ecology and conservation of albatrosses and petrels at sea off Brazil
… complete annual moult, start to moult during the breeding period, and replace several primaries and tail feathers at one time, whereas albatrosses undergo long moulting cycles, replace less feathers at once, and suspend the wing moult during breeding periods. Primary moult starting at P2 rather …
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