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Interrelationships of certain thermal and endocrine phenomena and reproductive function in the female bovineGwazdauskas, Francis Charles, January 1974 (has links)
Thesis (Ph. D.)--University of Florida, 1974. / Description based on print version record. Typescript. Vita. Includes bibliographical references (leaves 108-117).
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The effect of stage of the estrous cycle on interval to estrus and fertility after PGF2α injection in beef femalesKing, Michael Edward January 2011 (has links)
Typescript (photocopy). / Digitized by Kansas Correctional Industries
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The effect of thermal stress, exogenous ACTH and progesterone on the concentration of plasma corticoids and progestins in dairy cattle and subsequent estrous cycle activityDow, Steven Hugh, 1947- January 1974 (has links)
No description available.
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Seasonal differences in pituitary and testicular function in bullsPeirce, Anthony R. J. January 1984 (has links)
No description available.
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The effects of suckling on reproduction in postpartum beef cows pituitaty gonadotropins, ovarian follicular development, and fertility.Graves, William Earl, January 1967 (has links)
Thesis (Ph. D.)--University of Wisconsin, 1967. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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Seasonal differences in pituitary and testicular function in bullsPeirce, Anthony R. J. January 1984 (has links)
No description available.
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The rational development of improved in vitro maturation of bovine oocytesMcDowall, Melanie Lisa January 2004 (has links)
In vitro embryo production has vastly improved over the past decade through the study of the in vivo environment and the metabolic requirements of embryos. In contrast, in vitro oocyte maturation ( IVM ) culture conditions have remained relatively unchanged and are suboptimal. The aim of this thesis was to create improved systems for bovine IVM by studying the metabolic profiles and requirements of intact cumulus oocyte complexes ( COCs ) during IVM and determining the ion and energy substrate composition of bovine follicular fluid ( FF ). Glucose, pyruvate and oxygen consumption of bovine COCs increased 2 - fold over the 24 h IVM period, with glucose being the preferred energy substrate. While initially the majority of glucose consumed by COCs is metabolised via glycolysis ( Llactate production ), a considerable proportion of glucose is used as a substrate for extracellular matrix ( ECM ) synthesis towards the end of IVM. Glucosamine ( an intermediate substrate of hyaluronic acid ) supplementation of IVM media lead to decreased glucose consumption and incorporation into ECM during FSH - stimulated expansion. Biochemical analyses of bovine FF demonstrated that the concentration of some ions and energy substrates varied with follicle size. Although follicular glucose concentrations increased with follicle size, levels were ~ 2 - fold lower than that found in Tissue Culture Medium ( TCM199 ), the most commonly employed medium for bovine IVM. Synthetic Follicular Fluid Medium ( SFFM ) was created, based on the FF data and also contained glucosamine. Two different glucose concentrations were examined, 2.3 mM glucose to represent physiological concentrations and 5.6 mM glucose, the same concentration as is in TCM199. Culturing COCs in different glucose concentrations manipulated the completion of nuclear maturation and this was dependant on concentration, gonadotrophin supplementation and the timing of media changes, demonstrating the importance of this substrate to meiotic competence. Although glucosamine had no effect on oocyte nuclear maturation, supplementation during IVM led to a dose - dependent decrease in blastocyst rates. The detrimental effects of glucosamine manifested during early cleavage and were associated with a 0.6 - fold decrease in protein synthesis levels within the oocyte compared to oocytes cultured in media with no glucosamine, suggesting a detrimental effect on developmental competence. Interestingly oocytes cultured in media containing glucosamine and EGF had significantly higher protein synthesis compared to the control group. The biochemical profiles of COCs during IVM and FF were determined and used to create new media that allowed manipulation of oocyte nuclear maturation but compromised cytoplasmic maturation. Further research is required to optimise SFFM and to investigate the detrimental effects of glucosamine on developmental competence. / Thesis (Ph.D.)--Medical School, 2004.
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Use of prostaglandin F₂α in lactating dairy cows with a palpable corpus luteum but unobserved estrusPlunkett, Shawn S., 1959- January 2011 (has links)
Vita. / Digitized by Kansas Correctional Industries
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A study of spontaneous rosette formation in the bovine female during the immediate postestral periodFahmi, Hisham Ahmad January 2011 (has links)
Typescript (photocopy). / Digitized by Kansas Correctional Industries
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Relationships among rump and rear leg type traits and reproductive performance in HolsteinsShapiro, Leland Sanford 20 December 1990 (has links)
This study was conducted to determine the relationships among the
linear type traits of rump angle, rump width, rump length, rear legs
side view, rear legs position, rear legs rear view, tailhead, vulva
angle, mobility, pasterns, foot angle, and toes with reproductive
performance (days open and times bred) in Holstein cows and to develop
indices to predict reproductive performance from mathematical functions
of the anatomical traits. Two trials were conducted. The first trial
involved 7630 registered Holstein cows from Oregon and California. The
regression analysis (R²) showed only 1.1% of the variability of times
bred and 1.3% of the variability of days open was accounted for by the
rump and rear leg type traits.
In the second trial, 8155 Holstein cows, both registered and
grade, were analyzed using the linear type traits of rump angle, rump
width, rear legs side view, rear legs position, rear legs rear view
and foot angle.. Grade and registered cows were analyzed separately to
determine if differences in management between them would be reflected
in the statistical analysis. Evaluator, lactation number (parity),
season, geographic location, and the interaction of evaluator and
lactation number had a significant effect on most of the type traits and
the scorecard category (General Appearance, Mammary System, Dairy
Character and Body Capacity) scores examined. The effects of these
variables were statistically removed and the residuals of the type
traits were used in the final regression analysis. Using stepwise
regression analysis, several non-significant traits were omitted from
the final model. The analysis used days open and times bred as
dependent variables. Lactation number, mature equivalent milk, foot
angle, rump width and their respective quadratics were independent
variables, as were season calved and geographic location. The
regression analysis (R²) indicated that 5.3% of the variability in days
open and 4.7% of the variability in times bred in registered cows was
accounted for by the type traits, foot angle and rump width,
respectively, when the effects of season calved, geographic location,
lactation number and mature equivalent milk were included in the model.
For the grade cows the regression analysis (R²) indicated that 3.5% of
the variability in days open was accounted for by foot angle. None of
the type traits examined had a significant effect on times bred. This
study detected no significant influence of rump angle or rear leg position,
as described by the HFA linear classification program, on
reproductive performance. However, our analysis indicated that
fertility decreased as rear foot angles became more steep in grade and
registered cows and as rump width increased in registered cows. / Graduation date: 1991
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