The Output of Spermatozoa in Rams II. Relationship to Scrotal Circumference, Testis Weight, and the Number of Spermatozoa in Different Parts of the Urogenital Tract

Lino, BF

doi:10.1071/bi9720359

Cited by 68 publications

(31 citation statements)

References 11 publications

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“…The significant positive-correlation between the testis weight and the epididymal sperm reserves agrees with the data of Lino (1972) for Merino rams and with the data of Amann and Almquist (1961b) for bulls. This is related to the significant direct relationship observed, in the present study, between testis and epididymis weights.…”

Section: Discussionsupporting

confidence: 79%

“…A similar proposition has been made for bulls by Macmillan and Hafs (1968). The percentage of spermatozoa in the cauda epididymides in each of the three age groups is within the range of previous reports (68 ·9-78 ·5%) of Ortavant (1958) and Lino (1972).…”

Section: Discussionsupporting

confidence: 65%

“…The present results show that in Awassi rams the testis weight at 2·5 years of age is almost twice that at 1 year. The average single testis weight in Awassi rams aged 2·5 years(157·6±7·4 g) is lower than the weight recorded for 2-3-year-old Suffolk rams (Dott and Skinner 1967) and for 4-year-old fine wool Saxon Merino rams (Lino 1972). Breed differences are likely to exist.…”

Section: Discussionmentioning

confidence: 74%

“…The circumference of the excised testis, however, appeared to be of less value in predicting the gonadal spermatid numbers. Lino (1972) observed that in rams the scrotal circumference was significantly correlated with testicular weight, although not as highly significantly as in bulls (Willett and Ohms 1957), but it failed to give a significant correlation with the daily sperm production as determined from output from the urogenital tract.…”

Section: Discussionmentioning

confidence: 87%

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Testicular and Epididymal Sperm Numbers and Related Parameters in the Developing Awassi Ram

Abdou¹,

Tm²,

Sa³

1978

Aust. Jnl. Of Bio. Sci.

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Testicular parameters, parenchymal spermatid concentration, and epididymal sperm reserves were measured in tracts obtained from 16 Awassi rams classified into three age groups (1, 1·5 and 2·5 years old). Between 1 and 2·5 years of age the paired testis weight increased from 164·9 to 315·2 g, the testicular spermatid number (x 10 9 ) increased from 15·9 to 55·8, and the total epididymal sperm reserves (x 10 9 ) increased from 11·1 to 98·8.Significant correlations were found between the paired testis parenchyma weight and all testicular dimensions and size. Testicular spermatid numbers and concentration were correlated with paired testis weight (r = 0·91 and 0·63), paired testis volume (r = 0·92 and 0·64) and all testicular measurements, particularly paired length x depth (r = 0·92 and O· 66).Regression coefficients between all parameters were essentially linear and highly significant, allowing accurate predictions of testis weight, volume and spermatid numbers to be made. The total epididymal sperm reserves and the sperm content of each of the caput, corpus and cauda of the epididymis were correlated with the paired weights of the epididymis (r = 0·73,0·75,0·73 and 0·70), the testis (r = 0·76, 0·83, 0·91 and 0·72), the total spermatid numbers in testicular homogenates (r = 0·70, 0·85, 0·91 and 0·64), and spermatid concentration (r = 0·56, 0·75, 0·72 and 0·49). The storage capacity of the cauda epididymides appeared to develop more slowly than the rate of sperm production because at 2·5 years of age it was about 1 ·5 and 2·8 times that in rams aged 1·5 and 1 year respectively. IntroductionIn Iraq the fat-tailed Awassi is one of the major and most popular breeds of sheep. Information on the reproductive performance of this breed and particularly of the rams is very limited (Juma and Dessouky 1969;Injidi 1974). The aim of the present work was to quantify the sperm producing potential and epididymal sperm reserves of Awassi rams in relation to age, to establish their correlation with testis size and weight, and to find out how far the variations in epididymal sperm reserves relate to testicular sperm production.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 87%

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Testicular and Epididymal Sperm Numbers and Related Parameters in the Developing Awassi Ram

Abdou¹,

Tm²,

Sa³

1978

Aust. Jnl. Of Bio. Sci.

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“…No significant size or weight differences were noted between the testes of other Merino rams (Lino 1972), so bilateral symmetry was assumed where no difference in testis size was detectable by palpation. The mean daily output of spermatozoa from the rete testis catheter was doubled to give the estimate of the mean daily output of spermatozoa from both testes (DSOT).…”

Section: (A) Comparison Of Methods Of Estimating Daily Spermatozoan Pmentioning

confidence: 99%

The Output of Spermatozoa in Rams I. Relationship with Testicular Output of Spermatozoa and the Effect of Ejaculations

Bf¹,

Aw²

1972

Aust. Jnl. Of Bio. Sci.

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The mean daily output of spermatozoa was estimated for each of eight Merino rams from the numbers of spermatozoa eliminated from the urogenital tract both in the urine and in spontaneous discharges over 20 days (DSOU) and by doubling the number of spermatozoa collected daily from one testis by a rete testis catheter (DSOT). The two estimates (DSOU and DSOT) were highly correlated (r = 0·999), but the DSOU was usually a little lower than the DSOT. The mean difference was 3·4%.The effect of 20 ejaculations collected over 2 days was studied in four rams. The DSOU was severely depressed for a period of 9-16 days after the ejaculations but when the number of spermatozoa ejaculated was added to the DSOU in this period the mean daily spermatozoan output was similar to that in the periods immediately preceeding and succeeding it.It is concluded that the daily spermatozoan production of rams may be estimated accurately from the number of spermatozoa eliminated daily from the urogenital tract. It is unlikely that significant numbers of spermatozoa are resorbed or phagocytosed in the epididymides of normal rams.

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Spermatogenesis and Semen

Das,

Mukherjee,

Banerjee

2023

Textbook of Veterinary Physiology

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The Output of Spermatozoa in Rams II. Relationship to Scrotal Circumference, Testis Weight, and the Number of Spermatozoa in Different Parts of the Urogenital Tract

Cited by 68 publications

References 11 publications

Testicular and Epididymal Sperm Numbers and Related Parameters in the Developing Awassi Ram

Testicular and Epididymal Sperm Numbers and Related Parameters in the Developing Awassi Ram

The Output of Spermatozoa in Rams I. Relationship with Testicular Output of Spermatozoa and the Effect of Ejaculations

Spermatogenesis and Semen

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