Seasonal Variations in the Histometric Characteristics of the Reproductive Organs of Pubertal West African Dwarf Bucks in their Native Tropical Environment

Bitto, I. I.; Egbunike, G. N.; Akusu, M. O.

doi:10.4067/s0717-95022008000200024

Cited by 10 publications

(13 citation statements)

References 10 publications

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“…The earliest age reported for adequate sperm production was 5 months in WAD bucks [9] and 5.70 months in British bucks [36]. Tropical male goats were reported to reach puberty and sexual maturity at 3.20 and 4.40 months of age, respectively [37], but male Nubian goats reached puberty at 8 months of age [38].…”

Section: Discussionmentioning

confidence: 99%

“…Sperm heads in homogenized testicular and cauda epididymal tissues were counted with a manual cytometer (haemocytometer) as earlier described by Amann and Lambiase [32] and Igbokwe et al [33] with dilution of homogenates to facilitate counts and dilution factor used in the final calculation of counts. Optimal cauda epididymal sperm reserve was adjudged as ≥1.10 × 10 9 sperm cells [9, 15]. …”

Section: Methodsmentioning

confidence: 99%

“…Reference values of testicular size and sperm cell counts in cauda epididymides of Nigerian goats at postmortem or after castration, based on adequate number of reference individuals, were not accessible, but such values ought to be available to indicate normal variations observed in healthy populations so that it would be possible to identify individuals having abnormal values in unhealthy conditions [18]. Four postpubertal WAD goats at 5 months of age weighing 8.90–11.00 kg in the early dry season had cauda epididymal sperm reserve of 1.57 ± 0.32 (1.20–1.90) × 10 9 [9]. At the age of 12–14 months and weighing 19.52 ± 1.25 kg, 15 WAD goats were reported to have cauda epididymal sperm reserve of 1.46 ± 0.26 (1.20–1.70) × 10 9 [15].…”

Section: Introductionmentioning

confidence: 99%

“…At the age of 12–14 months and weighing 19.52 ± 1.25 kg, 15 WAD goats were reported to have cauda epididymal sperm reserve of 1.46 ± 0.26 (1.20–1.70) × 10 9 [15]. The WAD goats, in these reports, were intensively managed and fed adequately with supplements to obviate the effect of undernutrition on reproductive capacity [9, 15] and could be presumed to represent reproductively sound animals in the population. There is no evidence that the potential for sperm production differed between WAD and Sahel breeds [19].…”

Section: Introductionmentioning

confidence: 99%

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Testicular and Related Size Evaluations in Nigerian Sahel Goats with Optimal Cauda Epididymal Sperm Reserve

Abba

Igbokwe

2015

Veterinary Medicine International

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Testicular sizes of animals are important for identification of those with adequate sperm production. The aim of this study was to define the testicular and related size estimates that would be associated with optimal cauda epididymal sperm counts (ESC) in Sahel goats based on postmortem evaluations. A stratified quota sample population of 125 male goats inclusive of all testicular sizes was taken at a slaughterhouse in Maiduguri, Nigeria. The bucks were aged 18–30 months and weighed 17.04 ± 2.99 (12–25) kg. Body, testicular, and epididymal weights of each goat with other related size measurements were estimated. ESC was determined from homogenized tissue using a manual cytometer. At the cut-off ESC of >1.1 × 109 sperm heads, 66 (52.80%) of the goats had optimal ESC which was associated with testicular weight of 59.90 ± 16.10 (31.40–86.20) g, gonadosomatic index of 3.51 ± 0.69 (2.00–4.50) g/kg, and scrotal circumference of 19.07 ± 1.29 (17.00–21.80) cm. The size variables of the scrotum and testis correlated with one another and with the ESC. These findings provide data that may be used to anticipate adequate antemortem sperm reserve based on testicular size during preliminary selection of sires for breeding from a sexually mature Sahel buck population.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Testicular and Related Size Evaluations in Nigerian Sahel Goats with Optimal Cauda Epididymal Sperm Reserve

Abba

Igbokwe

2015

Veterinary Medicine International

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“…Quantitative histology has been used in determining daily sperm production in boars (10), rabbits (3), rats (13), goats (6), and domestic fowl (19). Information on possible seasonal variation in the breeding potential of ducks in the tropical environment is lacking.…”

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

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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.

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Novel SNPs in heat shock protein 70 gene and their association with sperm quality traits of Boer goats and Boer crosses

Nikbin

Panandam

Yaakub

et al. 2014

Animal Reproduction Science

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The semen quality of bucks affects the reproduction performance of the herd and is influenced by genetic and non-genetic factors. Heat shock protein 70 (HSP70) is considered as an important gene affecting semen quality traits. The objectives of this study are to find single nucleotide polymorphisms in HSP70 coding region and their association with semen quality traits on Boer and Boer cross bucks. DNA isolated from 53 goats (36 pure South African Boer and 17 Boer crosses) was subjected to PCR amplification of the exon 1 region of the caprine HSP70 gene. Single-strand conformation polymorphism (SSCP) was used to detect polymorphisms and the variant DNA fragments were sequenced. Two synonymous SNPs (74A>C (ss836187517) and 191C>G (ss836187518)) were detected. Qualities of fresh and post-thaw semen were evaluated for sperm concentration, semen volume, sperm motility and velocity traits, live sperm percentage, and abnormal sperm rate. The C allele of ss836187517 and G allele of ss836187518 were at higher frequencies in both the breeds. The C allele of ss836187517 appeared to be the favorable allele for semen concentration, progressive motility of fresh semen, and motility and sperm lateral head displacement of post-thaw semen. A negative overdominance was observed for ss836187517 alleles on velocity traits of post-thaw semen. The C allele of ss836187518 was favorable for sperm concentration and progressive motility. Results herein suggest that the SNPs in HSP70 may affect on semen quality in tropical regions and specially on the potential of semen for freezing.

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Seasonal Variations in the Histometric Characteristics of the Reproductive Organs of Pubertal West African Dwarf Bucks in their Native Tropical Environment

Cited by 10 publications

References 10 publications

Testicular and Related Size Evaluations in Nigerian Sahel Goats with Optimal Cauda Epididymal Sperm Reserve

Testicular and Related Size Evaluations in Nigerian Sahel Goats with Optimal Cauda Epididymal Sperm Reserve

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

Novel SNPs in heat shock protein 70 gene and their association with sperm quality traits of Boer goats and Boer crosses

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