PUBERTAL DEVELOPMENT OF RAM LAMBS: BODY WEIGHT AND TESTICULAR SIZE MEASUREMENTS AS INDICES OF POSTPUBERTAL REPRODUCTIVE FUNCTION

1990 ◽  
Vol 70 (1) ◽  
pp. 139-147 ◽  
Author(s):  
T. A. YARNEY ◽  
L. M. SANFORD ◽  
W. M. PALMER
Keyword(s):  
Semen Quality ◽  
Pubertal Development ◽  
Reproductive Function ◽  
Reproductive Traits ◽  
Scrotal Circumference ◽  
Ejaculation Frequency ◽  
Testicular Size ◽  
Ram Lambs ◽  
Sperm Output ◽  
The Relationship

The relationship between the pattern of early testicular growth and postpubertal spermatogenic function and libido was investigated with 14 Suffolk rams born in March. Scrotal circumference and testicular diameter (TD) measurements were taken every 10 d between 30 and 190 d of age, and at 13 and 17 mo. Daily sperm output (DSO, sperm voided in urine) or semen quality, and libido were assessed at approximately 6, 13 and 17 mo of age. At 6 mo of age, rams with the larger testes had a greater DSO (r ≥ 0.77, P < 0.01) and mated estrual ewes more frequently (r ≥ 0.72, P < 0.01). Rams with larger testes at 13 mo had a greater DSO (r ≥ 0.74, P < 0.01), and those with larger testes at 17 mo ejaculated a higher percentage of motile spermatozoa (r ≥ 0.55, P < 0.05) and a greater number of spermatozoa (r = 0.61, P < 0.05; TD only). DSO at 13 mo was related to testicular size (r ≥ 0.54, P < 0.05) between 150 and 190 d of age. There were also correlations between the number of spermatozoa ejaculated at 17 mo and testicular size measurements (r ≥ 0.56, P < 0.05) taken between 170 and 190 d. However, ejaculation frequency (EF) at both 13 and 17 mo was not related to earlier testicular size measurements. Whereas testicular size and spermatogenic function of yearling Suffolk rams relate to testicular size measurements taken at about 6 mo of age, juvenile testicular size measurements correlate with EF only in the immediate postpubertal period. Key words: Sexual maturation, reproductive traits, interrelationships, ram

PUBERTAL DEVELOPMENT OF RAM LAMBS: REPRODUCTIVE HORMONE CONCENTRATIONS AS INDICES OF POSTPUBERTAL REPRODUCTIVE FUNCTION

1990 ◽  
Vol 70 (1) ◽  
pp. 149-157 ◽  
Author(s):  
T. A. YARNEY ◽  
L. M. SANFORD
Keyword(s):  
Semen Quality ◽  
Pubertal Development ◽  
Reproductive Function ◽  
Reproductive Traits ◽  
Testosterone Concentration ◽  
Scrotal Circumference ◽  
Serum Lh ◽  
Ejaculation Frequency ◽  
Testicular Size ◽  
Sperm Output

Pubertal changes in blood serum concentrations of LH, FSH, PRL and testosterone were determined for 14 Suffolk rams born in March, and related to their postpubertal reproductive function. Blood samples were taken from the jugular vein (20-min intervals for 6 h) every 20 d and scrotal circumference and testicular diameter (TD) were measured every 10 d between the ages of 30 and 190 d, and at 13 and 17 mo. Daily sperm output (DSO, sperm voided in urine) or semen quality, and libido were assessed at about 6, 13 and 17 mo of age. LH-pulse magnitude increased between 30 and 70 d of age and then declined progressively to adult values; pulses occurred most frequently at 110 and 190 d of age, and at 17 mo. Mean concentrations of FSH, PRL and testosterone were highest at 50, 90 and 190 d of age, respectively, and changed normally with season when the rams were yearlings. Mean testosterone concentration at 50 d was related (P < 0.05) to testicular size (r ≥ 0.57) at all postpubertal ages and to ejaculation frequency (EF) (r = 0.82) at 6 mo and DSO (r = 0.78) at 13 mo. Mean and baseline concentrations of LH at 50 d were related (r ≥ 0.55, P < 0.05) to TD and DSO at 6 and 13 mo of age, and to EF at 6 mo. The strongest relationships (r ≥ 0.67, P < 0.01) were between mean testosterone concentration at 150 d and testicular size and sperm output at all postpubertal ages. Testicular size and spermatogenic function in yearling Suffolk rams relate to serum LH and(or) testosterone concentrations in the neonatal period (50 d) and at puberty (150 d). Key words: Sexual maturation, reproductive traits, interrelationships, ram

scholarly journals TESTICULAR SIZE AND SPERM OUTPUT IN HOLSTEIN-FRIESIAN AND N'DAMA BULLS

2021 ◽  
Vol 10 ◽  
pp. 114-118
Author(s):  
L. N. Nwakalor ◽  
B. I. Orji
Keyword(s):  
Body Weight ◽  
Testicular Volume ◽  
Regression Equations ◽  
Scrotal Circumference ◽  
Holstein Friesian ◽  
Testicular Size ◽  
Sperm Output ◽  
The Relationship ◽  
Artificial Vagina

Records collected over a period of four months from October 1978 to January 1979 from four Holstein-Friesian and four N'dama hulls, were used to study the relationship between testicular size and sperm output. Semen samples were collected from the bulls twice a week using the artificial vagina and non-oestrous female teasers. The means (± s.e.) of testicular measurements for Holstein-Friesian and N'danta, respectively, were 35.6 ± 1.8 and 7.9 ± 0.3cm. for scrotal cir­cumference, 12.6 ± 0.3 and 7.7 ± 0.8cm for testis length, 6.7 ± 0.3 and 3.7 ± 0.2em for testis diameter. Calculated mean testicular volumes were 296.8 I 22.2 and 57.4 ± 10.1m1 respectively for Holstein-Friesian and N'dama bulls. T-he mean total sperm per ejaculate were 8.80 t 3.045 x 109 for (be Holstein-Friesian and 3.03 ± 0.905 x 109 for the N'dama bulls. Simple correla­tions for Holstein-Friesian and N'damn in the same order, were between body weight and scrotal dr. rumference 0.49 and 0.66, body weight and sperm output/einculate 0.48 and 0.88, scrotal cir­cumference and testicular volume 0.74 and 0.60. scrotal circumference and sperm outpuilejactilete 0.18 and 0.69, and testicular volume and sperm out­put/ejaculate —.45 and 0.84. Regression equations for predicting sperm oat­put/ejaculate from testicular volume are given as Y = .13.458 — .031 X and Y' = - .650 + 0,038 x respectively, for holstein-Friesian and N'dania bulls.

Pubertal development and testicular function in the male growth hormone-deficient rat

1990 ◽  
Vol 126 (2) ◽  
pp. 193-201 ◽  
Author(s):  
J. M. S. Bartlett ◽  
H. M. Charlton ◽  
I. C. A. F. Robinson ◽  
E. Nieschlag
Keyword(s):  
Gh Deficiency ◽  
Pubertal Development ◽  
Adult Life ◽  
Testicular Development ◽  
Mouse Mutants ◽  
Reproductive Axis ◽  
Snell Dwarf ◽  
Testicular Size ◽  
Sperm Output ◽  
Dwarf Mice

ABSTRACT The pubertal development of a novel GH-deficient mutant, the dwarf rat, has been evaluated. The establishment of normal spermatogenic function within small testes suggests that GH plays no role in spermatogenic function during puberty and adult life. However, a reduction in testicular size may reflect a reduced Sertoli cell population, suggesting that GH may be of importance in prepubertal testicular development. Furthermore, marked differences between the homozygous dwarf rat and homozygous GH-deficient mouse mutants (e.g. Snell, Ames, pygmy and little mutants) have been demonstrated. It would appear that the GH deficiency in the rat mutant is far more specific for GH than those hitherto described in the mouse. In contrast to Snell dwarf mice mutants, pituitary and serum concentrations of FSH and LH are normal throughout pubertal development in the dwarf rat. Both spermatogenic function and seminal vesicle function develop normally, whilst in Snell dwarf mice spermatogenic function develops late in life and seminal vesicles remain infantile. Serum and testicular concentrations of androgen are also normal in dwarf rats. Homozygous dwarf rats have been shown to be fertile in previous studies; however, our observations suggest that despite spermatogenesis being qualitatively and quantitatively normal when assessed histologically, reduced testicular size seen in dwarf rats would lead to a reduced daily sperm output in these animals. The dwarf rat represents a mutant in which the consequences of the selective depletion of GH may be studied on various endocrine systems. The reproductive axis appears to be only partially affected, at an early age, by GH deficiency. Journal of Endocrinology (1990) 126, 193–201

scholarly journals Characteristics of the puberty in hair ram lambs and its crosses in a non-seasonal country

2018 ◽  
pp. 7097-7103
Author(s):  
Liliana Chacón ◽  
Harvey Lozano Marquez ◽  
Jaumer Andrés Orozco Clavijo ◽  
Ariosto Ardila Silva
Keyword(s):  
Semen Quality ◽  
Serum Testosterone ◽  
Elisa Test ◽  
Minimum Concentration ◽  
Scrotal Circumference ◽  
Genotype Effect ◽  
Body Development ◽  
Tropical Conditions ◽  
Ram Lambs ◽  
Santa Inês

Objective. Aimed to describe the characteristics of the onset of puberty in males in Colombian hair ram lambs (Ovino de Pelo Colombiano, OPC), and their crosses with Katahdin and Santa Inés sheep in a farm located in Villavicencio, Meta. Materials and methods. 15 lambs of three biotypes: OPC x OPC, Santa Ines x OPC (SO) and Katahdin X OPC (KO) from four months of age, five per group. Ram lambs were grazing and they had supplementation with commercial salt and water ad libitum. Monthly body weight, testicular measurement, scrotal circumference (CE) were measured and serum testosterone were determined by Elisa test, an ultrasound of the two testicles was performed to determine the presence of the testicular mediastinum, also evaluating the presence and detachment of the urethral prolongation and then electro ejaculation was performed to determine the macroscopic and microscopic characteristics of the semen. Results. Genotype effect was significant for evolution of body development (BW, SC, TV) over time, Santa Ines and Katahdin crosses presented the highest values in BW during the investigation whereas OPC lambs maintained a lower value until the end of the trial. At least four evaluations were made in the males or until the presentation of a minimum concentration of 150 million of sperm per ml with 30% of individual progressive motility.  Conclusions.Around six months old is the puberty onset for ram lambs under tropical conditions, in a non-seasonal country, based on a diversity of variables including body development, semen quality, and testosterone levels among others.

scholarly journals The Influence of Varicocele and Microsurgical Varicocelectomy on Semen Quality, as Determined by Metabolic Analysis

2021 ◽  
Author(s):  
Xinzong Zhang ◽  
Cuncan Deng ◽  
Wujiang Liu ◽  
Huang Liu ◽  
Yu Zhou ◽  
...  
Keyword(s):  
Western Blotting ◽  
Seminal Plasma ◽  
Semen Quality ◽  
Reproductive Function ◽  
Normal Subjects ◽  
Metabolic Abnormality ◽  
Human Tissues ◽  
Metabolic Analysis ◽  
The Relationship

Abstract The influence of varicocele and microsurgical varicocelectomy on semen quality remains unclear. No previous study has investigated the relationship between semen metabolism and the abnormalities in reproductive function caused by varicocele. Here, we used the non-targeted and targeted metabolic analysis to investigate the different metabolites in seminal plasma within normal, varicocele, and varicocelectomy groups. We clearly showed that varicocele significantly affects sperm metabolism, and microsurgical varicocelectomy can reverse this metabolic abnormality. Moreover, we characterized the landscape of three dipeptides in the seminal plasma of patients with varicocele that have not been identified previously in human tissues or biofluids. Interestingly, the levels of these three dipeptides decreased after microsurgical varicocelectomy coincident with an improvement in semen quality. Western blotting confirmed the downregulation of DPEP3 (dipeptidase 3) in the varicocele group and the upregulation of DPEP3 in the varicocelectomy group. Furthermore, we found that eight metabolites may be helpful to distinguish varicocele patients from normal subjects. Our results can be applied to earlier diagnosis or to predict the outcome of microsurgery for varicocele.

SCROTAL CIRCUMFERENCE, SEMEN CHARACTERISTICS, GROWTH PARAMETERS AND THEIR RELATIONSHIPS IN YOUNG BEEF BULLS

1985 ◽  
Vol 65 (4) ◽  
pp. 789-798 ◽  
Author(s):  
M. MAKARECHIAN ◽  
A. FARID ◽  
R. T. BERG
Keyword(s):  
Semen Quality ◽  
Growth Parameters ◽  
Scrotal Circumference ◽  
Three Samples ◽  
Semen Volume ◽  
Semen Characteristics ◽  
The Mean ◽  
Beef Bulls ◽  
The Relationship ◽  
Daily Gain

The records of sixty-six yearling and 2-yr-old beef bulls selected for breeding in 1980 and 1981 were used to study the relationships between body weight (BW) and gain measurements, scrotal circumference (SC) and semen characteristics in young beef bulls. The bulls belonged to four breed groups; Hereford, Beef Synthetic, Dairy Synthetic and Pee Wee. A week before the start of breeding season, the bulls were weighed and measured for scrotal circumference. A single prebreeding semen sample was collected by electro-ejaculator from each bull in 1980, while three samples (pre-, mid- and postbreeding) were collected by artificial vagina in 1981. The mean SC ranged from 31.3 cm in the Pee Wee to 38.6 cm in the Beef Synthetic, while SC per 100 kg BW was maximum in the Pee Wee (8.36%) and minimum in the Dairy Synthetic group (6.28%, P < 0.05). The relationship between BW and SC was linear within yearling and 2-yr-old bulls. Age did not have any effect on SC over and above BW within each age group. Preweaning daily gain accounted for a higher fraction of variation in SC compared to BW in all the breed groups except Dairy Synthetic. The relationships between BW, SC and feedlot daily gain with semen quality and quantity were positive but generally small (r < 0.30, P > 0.11). Semen volume and sperm motility had lower values and percent secondary abnormalities were higher in prebreeding compared with mid- or postbreeding samples. Repeatability estimates of the semen characteristics were generally low, ranging from 0 to 0.49. Key words: Beef bulls, scrotal circumference, semen characteristics, growth rate

scholarly journals SCROTAL AND TESTICULAR DIMENSIONS IN SOME WEST AFRICAN BULLS

2021 ◽  
Vol 4 (2) ◽  
pp. 31-36
Author(s):  
O. Osinowo ◽  
S. M. Dennis ◽  
D. I. K. Osori ◽  
E. C. I. Molokwu
Keyword(s):  
Standard Deviation ◽  
West African ◽  
Regression Equation ◽  
The Other ◽  
Limited Evidence ◽  
Scrotal Circumference ◽  
Partial Correlations ◽  
Testicular Size ◽  
Highly Correlated ◽  
The Relationship

A series of studies were  conducted to estimate testicular size from scrotal measurement and determine the relationship between testicular size, age and liveweight in some West African bulls. Repeatability estimate for scrotal circumference measurements between technicians was 0.96. scrotal circumference was highly correlated to paired testes weight (r = 0.88) and volume (r = 0.87). Testes weight and volume were reclosely related (r = 0.997) but their ration (g/cc)varied in 30 bulls from 0.962 to 1.119, with a mean and standard deviation of 1.027 + 0.029. The regression equation for estimating tests weight (Y) from scrotal circumference (X) was Y = 506.17 + 27.70X. Significant correlations existed between scrotal circumference and age (r from 0.59 to 0.79) or liveweight (r from 0.62 to 0.83) in N Dama, Bunaji and Sokoto-Gudali bulls. However, examination of the partial correlations showed that most of the age effects were attributable to changes in liveweight. Limited evidence indicate that young Bunaji bulls have larger testis than the other two breeds although they may be overtaken by Sokoto-Gudali bulls after 5 years of age

scholarly journals Hubungan Lingkar Skrotum dengan Kualitas Semen Sapi Kuantan Riau

2019 ◽  
Vol 3 (1) ◽  
pp. 19-24
Author(s):  
Jiyanto Jiyanto ◽  
Pajri Anwar
Keyword(s):  
Regression Analysis ◽  
Semen Quality ◽  
Regression Equation ◽  
Moderate Correlation ◽  
Spermatozoa Motility ◽  
Scrotal Circumference ◽  
Low Correlation ◽  
The Relationship

The aim of this study was to determine the correlation between scrotal circumference and semen quality of the Riau Kuantan cattle. The study was conducted in Benai District, Kuantan Singingi Regency. The material used was 15 Kuantan bulls. The parameters observed were scrotal circumference, semen quality and the correlation between scrotal circumference and semen quality. The results of this study indicated that the size of Kuantan cattle scrotum circumference was 23.06 cm; viability 76.67%; and motility 58%. The results of regression analysis which conducted on scrotal circumference for the viability and motility showed not significant (P0.05). The correlation between scrotal circumference with spermatozoa viability of Kuantan cattle showed a moderate correlation of 0.40. The relationship between scrotal circumference with spermatozoa motility in Kuantan cattle showed a low correlation of 0.22. The regression equation obtained to determine the relationship between scrotal circumference with viability and motility of spermatozoa were Y = 45.44 + 1.35X and Y = 44.77 + 0.57X, respectively. The results of this study indicated that scrotal circumference cannot be made as determinant of spermatozoa quality of in Riau Kuantan bulls.

P–741 Fetal exposure to maternal perceived stress and male reproductive function in a cohort of young adults

2021 ◽  
Vol 36 (Supplement_1) ◽  
Author(s):  
K Petersen ◽  
K Keglber. Hærvig ◽  
J P Bonde ◽  
K Søri. Hougaard ◽  
G Toft ◽  
...  
Keyword(s):  
Emotional Stress ◽  
Perceived Stress ◽  
Negative Binomial ◽  
Maternal Stress ◽  
Semen Quality ◽  
Young Men ◽  
Reproductive Function ◽  
Reproductive Hormones ◽  
Specific Information ◽  
Testicular Size

Abstract Study question Is exposure to maternal perceived stress during pregnancy associated with reproductive function in adult male offspring? Summary answer While maternal perceived stress was prevalent in the first trimesters of pregnancy, our preliminary findings indicate little association with reproductive function in young men. What is known already Though studies in animals point to a connection between prenatal exposure to maternal stress and reproductive function in offspring, the underlying biological mechanisms generating a deficit remain largely unclear. In humans, the few available studies focus on exposure to bereavement or other relatively strong objective stressful life events. Our individual perception of stress is, however, more likely the sum of a complex process involving both the actual input, previous experiences, coping strategies and support from our surroundings. Study design, size, duration Young men and their mothers were identified through records from the Danish National Birth Cohort (DNBC). Information on exposure, i.e. maternal perceived life and emotional stress, was available from telephone interviews conducted at approximately 30 weeks of gestation (1996 to 2001). Recruitment of the young men lasted from 2017 to 2019 with 1058 participants enrolled in the final FEPOS cohort. Participants/materials, setting, methods Each of the 1058 men in the FEPOS cohort completed an online questionnaire and clinical examinations and provided a blood and semen sample. Information on potential pre- and postnatal confounders was retrieved from the DNBC, the Danish National Patient Register and the Danish Medical Birth Register. We applied negative binomial regression models to examine associations between maternal perceived life and emotional stress scores and semen quality, testicular size and reproductive hormones among the young men. Main results and the role of chance Among the 1052 young men included in preliminary analyses, the majority was exposed to maternal perceived life and/or emotional stress (76% and 83%, respectively) during the first trimesters. Life stress was predominantly related to the actual pregnancy (48%), maternal disease (19%) or occupational conditions (33%). Emotional stress included especially being touchy (58%), sad (38%) or tense (36%), covering aspects of both stress, depression and anxiety. Overall, results indicate little association between maternal stress scores and measures of semen quality and testicular size. Our study involves a large cohort with prospectively collected exposure data and direct measures of several male reproductive outcomes. We applied inverse probability weighting to account for selection into the FEPOS cohort and included a range of a priori selected maternal confounders in our models. Limitations, reasons for caution The male fetus may be particularly sensitive to exposure during the differentiation of reproductive tissues (8–14 weeks of gestation). Our self-reported measures of exposure cover the first 30 weeks of gestation. Absence of association may, thus, be due to a lack of specific information on timing of symptoms. Wider implications of the findings: While our preliminary findings may appear reassuring, further efforts to improve our understanding of maternal stress in relation to fetal health and potential consequences later in life are needed. Trial registration number Not applicable

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