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 19 of 19 for “"Estrous cycles"”.
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An Analysis of Body Condition Scores, Ultrasonographic Fat Thickness, and the Interaction Between the Two on Conception Rates in Yearling Cross-Bred Heifers
… in an analysis of conception rates through three estrous cycles. Cattle were estrus synchronized and artificially inseminated through two estrous cycles then pasture exposed to reproductively sound Branvieh bulls. Body condition scores (BCS), ultrasonographic fat thickness (UFT), ultrasonographic …
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Behavioral and Reproductive Aspects of Captive Maxwell's Duiker (<em>Cephalophus mawellii</em>) Husbandry
… in progesterone levels revealed no clear estrous cycles. Animals showed less variability in progesterone levels and more concordance among animals once introduced into group housing. Identifying activity budgets and estrus in group- versus single-housed Maxwell's duikers will provide …
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Disrupted female reproductive cyclicity and gonadotropin-releasing hormone neuron dysfunction in a mouse model of temporal lobe epilepsy
… 60% percent of KA-injected mice showed disrupted estrous cycles, typically characterized by increased estrous cycle length and increased time spent in diestrus estrus by 42 days post-KA injection. Hypothalamic gonadotropin-releasing hormone (GnRH) neurons are key players in the neural control of …
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Lowered reproduction efficiency as a correlated response to selection for increased post-weaning gain in laboratory mice
… line crosses. Observations were as follows: (1) Estrous cycles were charted by vaginal smears and plugging rate, litter rate, and litter sizes recorded; (2) Ovulation rate was obtained by counting CL's at 3½ and 7 days after mating; (3) Fertilization rate was obtained at 3½ days after mating; (4) …
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Resveratrol: therapeutic role in metabolic and reproductive function in obese broodmares
… carrier paste. Across three consecutive estrous cycles, morphometric measurements were collected biweekly and follicular dynamics were evaluated via transrectal ultrasonography every other day. Frequently-sampled intravenous glucose tolerance tests were conducted pre- and post- treatment. …
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Utilization of early weaning and intrafollicular insemination as methods to improve the reproductive performance of cattle
… puberty in heifers. Heifers will experience more estrous cycles before breeding, which is associated with increased fertility. In this experiment, heifers were either subjected to early weaning and a high concentrate diet (EW; 106.5±3.4 days of age) or normal weaning (NW; 231.7±3.33 days of age) …
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Progesterone and Prolactin Profiles of the Female Asian Elephant (Elephas Maximus)
… daily (around estrus), weekly (throughout the estrous cycle), and bimonthly (during gestation) in 8 female Asian elephants. A total of 18 estrous cycles with 4 resulting in conception are described. Early gestational values are shown in 4 animals, with 2 animals followed to term. Serum …
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Sexual Behavior in Normal and Prenatally Androgenized Female Hamsters
… pairing the experimental female hamsters with estrous stimulus female hamsters (Mesocricetus auratus), 26 of 38 normal female hamsters displayed thrusts at least once over 8 estrous cycles. Therefore, the effects of hormonal treatments during adulthood appear activational rather than …
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The actions of gossypol on the physiologic antioxidant defense system
… The present study found irregularities in the estrous cycles and ultrastructural changes in endometrial macula adherentes of gossypol treated female rats.
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Detection of Progesterone in Cow’s Milk for the Prediction of Reproductive Performance
… (P4) is one of the hormones that regulates the estrous cycles of female animals and therefore, the determination of P4 levels is one of the most accurate means for the detection and verification of the onset of estrus. However, to measure progesterone in cow’s milk one must overcome the milk …
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Variation in Social Behavior Throughout the Estrous Cycle of a Captive Killer Whale <i>Orcinus orca</i>
… The present study examined the influence of the estrous cycle of a captive female killer whale on the rate, duration, initiation and reception of social behavior she performed with her only pool mate, a male Atlantic bottlenose dolphin. Although these two delphinid species do not commonly …
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The effect of prenatal androgen exposure on sexual differentiation and postnatal growth in beef cattle
… were used to estimate the age at puberty and estrous cycle lengths. At 4, 8 and 12 months of age blood samples were collected every 15 min for 12 h from three male, female and androgenized female calves. Serum was analyzed for growth hormone (GH), prolactin (PRL) and thyroxine (T₄) …
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Development of the induced gonadotropin surge mechanism in the prepubertal heifer
… the immature female does not begin spontaneous estrous cycles until much later in development. One difference that has been shown in these studies is the lack of responsiveness of FSH to estradiol stimulation in dairy heifer calves.
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Natural history of the pichi (Zaedyus pichiy) in Mendoza Province, Argentina
… an increase in daylength. The absence of regular estrous cycles and corpora lutea in non-pregnant females, and immediate mating attempts after pairing, all suggest that pichis are induced ovulators. Clinical examinations and hematological, serological and coproparasitological analyses of …
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Effects of Fertility Control on the Movement Ecology of White-Tailed Deer
… most female deer unbred, leading to multiple estrous cycles throughout the breeding season. Concerns have been raised that the additional estrus periods may extend breeding activity, potentially leading to decreased body condition and increased incidence of DVCs. To investigate these potential …
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Effect of naloxone on serum luteinizing hormone concentrations during the early postpartum period and the estrous cycle in primiparous and multiparous holstein cows
… periods after parturition and two phases of the estrous cycle. In experiment 1, 24 cows (12 primiparous; 12 multiparous) received either saline (n = 12) or 1 mg/kg naloxone (n = 12) i. v. at 14 1 days postpartum. Blood samples were collected at 15-minute intervals for 2 hours before and 2.5 hours …
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In-vivo analysis of hypothalamic kisspeptin neuron activity patterns
… ARNKISS neuron activity, resembling the normal estrous cycles. The frequency of ARNKISS neuron SEs was significantly increased in algorithm-identified ‘diestrous stage’ PNA mice compared to controls. Further experiments showed reduced feedback suppression of progesterone on ARNKISS neurons in …
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Untersuchen zur Regulation der uterinen und ovariellen Durchblutung sowie der Expression von Stickstoffmonoxidsynthasen und Östrogenrezeptoren im Verlauf des Zyklus und der Frühgravidität bei der Stute
… trotter mares were examined in total during four estrous cycles and one early pregnancy. The investigations contained color Doppler- and ultrasound recordings as soon as the extraction of blood samples and endometrial biopsies. The first cycle was medically uninfluenced and investigations were …