Sperm Production of Boars as Measured From Epididymal Sperm Reserves and Quantitative Testicular Histology

Swierstra, E. E.

doi:10.1530/jrf.0.0270091

Cited by 35 publications

(13 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…286.5 ± 13.7 359.5 ± 11.2** Epididymis wt, g 60.8 ± 2.5 79.2 ± 2.1** Tunica wt, g 27.9 ± 2.0 36.2 ± 1.6** Parenchyma wt, g 255.1 ± 12.3 318.0 ± 10.1** Total testicular sperm, billion 39.0 ± 2.9 57.7 ± 2.4** Daily sperm production, billion 8.9 ± 0.7 13.2 ± 0.5** Total sperm reserves, billion 101.6 ± 6.6 138.9 ± 5.4** Ejaculation frequency influences the time during which sperm are in the cauda epididymis and total sperm output (Amann, 1981). However, rate of sperm movement through the caput and corpus epididymis is not influenced by ejaculation (Amann and Almquist, 1962;Swierstra, 1971). Therefore, fertility of the sperm should not have been decreased even though fewer sperm were collected as collection number increased.…”

Section: Discussionmentioning

confidence: 99%

Effect of selection for size of testes in boars on semen and testis traits.

Huang

Johnson

1996

Journal of Animal Science

View full text Add to dashboard Cite

ABSTRACT:The objective of this study was to evaluate the effects of selection for increased size of testes on semen and testis characteristics. Boars from a line selected for increased size of testes at 150 d of age (TS, n = 25) and a randomly selected control line (C, n = 18) were used. Semen was collected three times per week for 3 wk (TRT1) then daily for 3 wk (TRT2) beginning when boar age averaged 276 d. It was followed by a 4-wk period of one collection per week and then the TRT1-TRT2 sequence was repeated. After 64 collections, boars were castrated and testes were evaluated for sperm numbers. Volume of semen, percentage of motile sperm cells, and percentage of abnormal cells in the semen did not differ ( P > .05) between lines. Concentration of sperm cells in the semen was greater for TS boars at TRT 1 (35.0 million cells/mL, P < .10) and TRT 2 (29.5 million cells/mL, P < .01). Number of sperm cells per ejaculate was greater for TS boars (6.1 and 4.3 billion cells for TRT 1 and TRT 2, respectively; P < .05). Percentage of abnormal cells was less ( P < .05) for boars at the younger ages. Concentration of sperm cells was 16 to 18 million cells/mL semen greater ( P < .05) at the older ages. Significant differences in the shapes of the response curves with increasing collection number across lines and ages were found. These differences were small and not considered to be important. Line differences in testicular and epididymal sperm numbers and in daily sperm production were consistent with differences in semen traits. Repeatabilities of semen traits were between .16 and .74. Selection for increased size of testes can be used to improve the reproductive capacity of boars used for artificial insemination.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of selection for size of testes in boars on semen and testis traits.

Huang

Johnson

1996

Journal of Animal Science

View full text Add to dashboard Cite

show abstract

“…The length of the seminiferous tubules was determined by the formula The volume of round spermatids was obtained by the method of Swierstra, whereas tissue shrinkage was determined using Abercrombie's correction factor (1,23).…”

Section: Praca Oryginalnamentioning

confidence: 99%

Effect of season on structural composition of drake testes and daily spermatozoa production as determined by quantitative testicular histology

Okpe¹,

Udoumoh²

2016

Medycyna Weterynaryjna

View full text Add to dashboard Cite

Effect of season on structural composition of drake testes and daily spermatozoa production as determined by quantitative testicular histology Summary Seasonal effects on the structural features of drake testes and daily spermatozoa production were investigated by a light microscopy technique, as well as morphometric and quantitative histological procedures. The present study is aimed at understanding the effects of different seasons on the reproductive potential of drakes. The results showed that the volume of the testes occupied by seminiferous tubules was similar (P > 0.05) in all the seasons studied. However, the relative percentage of the primary spermatocytes, spermatids, spermatozoa, epithelial height, lumen diameter, and Leydig cells were significantly higher (p < 0.05) during the early and late rainy seasons compared to the early and late dry seasons. The daily sperm production per testis in the early rainy season, late rainy season, early dry season, and late dry season were 0.86 × 10 9 ± 1.30, 0.84 × 10 9 ± 1.20, 0.54 × 10 9 ± 1.13 and 0.52 × 10 9 ± 1.17, respectively. The daily sperm productions per testis and per gram of testes were significantly higher (p < 0.05) during the early rainy season compared to the early and late dry seasons, respectively. All the micrographs examined, showed evidence of normal spermatogenesis throughout the year. The findings in the present study indicate that drakes in the tropical environment (south-eastern Nigeria) are capable of breeding throughout the year; however, sperm production efficiency is optimal during the early rainy season.

show abstract

“…A avaliação da LDE proporciona a estimativa da produção diária de espermatozóides (SWIERSTRA, 1968b;1971;1973), representando em tomo de 85%, 88% ou 83% desta (SWIERSTRA, 1968a). Os baixos valores do número total de espermatozóides ejaculados e da LDE nas primeiras semanas de coleta são característicos do período pós-púbere (FLORCRUZ & LAPWOOD, 1978).…”

Section: Estudounclassified

Comportamento de monta e características seminais de suínos jovens landrace e large white

et al. 2005

View full text Add to dashboard Cite

Sperm Production of Boars as Measured From Epididymal Sperm Reserves and Quantitative Testicular Histology

Abstract: Summary. Four methods of measuring daily sperm production (DSP) were evaluated using seventy-two boars. The

Cited by 35 publications

References 13 publications

Effect of selection for size of testes in boars on semen and testis traits.

Effect of selection for size of testes in boars on semen and testis traits.

Effect of season on structural composition of drake testes and daily spermatozoa production as determined by quantitative testicular histology

Comportamento de monta e características seminais de suínos jovens landrace e large white

Contact Info

Product

Resources

About