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- W2155113533 abstract "Three experimental and three control heifers were included in the study. After a control period (CP), the experimental heifers were subjected to 4 and 5 weeks of twice-weekly follicular punctures (FPP1 and FPP2) with two oestrous cycles in between. The follicular punctures were performed using the ovum pick-up (OPU) technique. During the CP and FPPs, ovarian activity was monitored by transrectal ultrasonography and analyses of plasma progesterone, prostaglandin F2alpha (PGF2alpha) metabolite, luteinizing hormone (LH), oestradiol and follicle stimulating hormone (FSH) levels. The animals were slaughtered 7 days after cessation of FPP2 and their ovaries examined. The control animals were monitored for their oestrous cyclicity and were then ovariectomized and the ovaries examined. Despite the absence of ovulation, the formation of corpus luteum (CL)-like structures could be ultrasonographically observed during FPPs. These structures either had characteristics comparable to those of the CLs during the CP (group 1) or were smaller and had a shorter life span and (or) luteal active phase with a lower progesterone production (group 2). In group 1, CL-like structures emanated from punctures of large-sized follicles on or close to the days on which the animals showed oestrus and had a rise in oestradiol and LH. In group 2, the structures developed from punctures of smaller-sized follicles and no oestrus nor a detectable 1.14 rise was revealed around punctures. During most FPPs, the basal level of LH was at zero. During all FPPs, a significant rise in FSH level occurred on the day following the day of puncture. To conclude, repeated follicular puncture appeared to alter slightly endocrine profiles and cause minor morphological changes in the ovaries. Both the macro- and microscopic examinations revealed the presence of luteal structures and follicles of various sizes in the ovaries of all heifers studied. The connective tissue in the ovarian tunica albuginea of the experimental heifers was significantly thicker than that in controls (P < 0.001)." @default.
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- W2155113533 date "2001-10-09" @default.
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- W2155113533 title "Effects of Repeated Follicular Punctures on Ovarian Morphology and Endocrine Parameters in Dairy Heifers" @default.
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- W2155113533 doi "https://doi.org/10.1046/j.1439-0442.2001.00375.x" @default.
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