A comparative study of boar semen collected by electroejaculation and gloved-hand technique

http://www.worldcat.org/oclc/4784416</p

Correlative Analysis of Sperm Morphology, Seminiferous Epithelial Area and Testis Weight in the Boar

99 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982.During six collections at two month intervals, testes and epididymides of 300 boars were collected at an abattoir. Sperm samples from both right and left cauda epididymis of each boar were collected from which two groups were identified using the criterion in the frequency of sperm abnormalities. Group A (Normal) had a frequency of abnormal spermatozoa considered to be consistent with normal fertility; and Group B (Abnormal) which had a high incidence of abnormal spermatozoa that would be expected to result in decreased fertility. In each group, seminiferous epithelial area (SEA) was taken by digitizing 50 seminiferous tubules per testis. Also, different degrees of histologic changes were determined for each testis from the same tissue sections. Testicular spermiostasis was examined macro and microscopically. Chicago, Illinois was the focal point of measuring temperature differences occurring throughout the year. The primary objective was to determine the possible correlation between different frequencies of sperm abnormalities from the cauda epididymis and the relative amount of seminiferous epithelium; and also to find if there is a relationship between these two variables and testis and epididymis weights in the boar. A second objective was to determine if temperature differences have any effect on the frequency of abnormal spermatozoa. The results demonstrated that higher frequencies of proximal droplets (PD), abnormal middle-piece (AMP) and abnormal heads (AH) had a negative correlation with the amount of SEA. It also was found that normal boars exhibited a positive correlation between testicular weight (TWT) and SEA while abnormal boars did not. Therefore, it appears that the SEA may be a relatively good indicator to determine testicular function. Regarding clinical evaluation of boars, the strong correlation of PD frequency with reduced SEA and the frequent association of other morphologic defects with the higher frequencies of PD indicates that this defect should be given more attention in semen examination than has been done in the past. Seasonal temperature changes did not appear to have a uniform depressing effect on sperm morphology in the present study.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD

Pulido Valencia, Marcelino

Los objetivos de este estudio fueron evaluar la capacidad reproductiva de sementales bovinos y determinar las diferencias entre razas cebuinas, mantenidas en clima seco estepario cálido.Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuaria

Regional Node Distribution in Papillary Thyroid Cancer with Microscopic Metastasis

Background. Optimal neck lymphadenectomy in patients with papillary thyroid cancer (PTC) and microscopic lymph node metastasis needs to be defined in order to aid surgeons in their decision about the best way to proceed in these cases. Methods. Patients who underwent total thyroidectomy and lymphadenectomy at levels IIa to VI were divided into two groups: Group 1 (G1) with macroscopic metastasis detected before surgery and Group 2 (G2) with microscopic metastasis detected in sentinel node during surgery. Odds ratio (OR) was computed for age, sex, tumor size, multicentricity, capsular invasion, vascular/lymphatic permeation, and nodes with metastasis. Results. Primary tumor size was (G1 versus G2, respectively) 3.8 cm versus 1.98 cm (P<0.001); only lymphatic permeation was correlated to an increase in metastasis in lymph nodes 65.4% versus 25% (OR=5.6, p<0.001); metastatic frequency by region was IIa 18.5% versus 1.5%, III 24.3% versus 9.9%, IV 17.4% versus 18.1%, and VI 25.9% versus 71,2%. Metastasis to level V was found only in G1. Conclusion. Selective lymphadenectomy at levels III, IV, and VI is optimal for PTC patients without preoperative evidence of lymph node disease, but who present with lymph node microscopic metastasis in an intraoperative assessment