Seasonal variations in testicular consistency, scrotal circumference and spermiogramme parameters of extensively reared Brahman (Bos indicus) bulls in the tropics

Chacón, Jorge; Pérez, E.; Rodríguez‐Martínez, H.

doi:10.1016/s0093-691x(02)00679-9

Cited by 28 publications

(24 citation statements)

References 28 publications

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“…Although the presence of these forms in the epididymis is likely a normal phenomenon, the proportion of these forms may vary with season, as demonstrated for sperm motility from many of these same species [67,68]. For example, seasonal variation in the proportion of normal sperm and the incidence of bent midpieces and retained cytoplasmic droplets has been reported for goats, cattle, and African buffalo [75][76][77]. Although Percoll processing statistically improved sperm morphology, the proportion of normal spermatozoa following Percoll was less than or equal to 32% across species.…”

Section: Discussionmentioning

confidence: 99%

Postthaw Evaluation of In Vitro Function of Epididymal Spermatozoa from Four Species of Free-Ranging African Bovids1

Herrick

Bartels

Krisher

2004

Biology of Reproduction

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An improved understanding of reproductive physiology in nondomestic bovids is necessary for the development of assisted reproductive technologies (ARTs) for use in the conservation of endangered bovids. In this study, epididymal spermatozoa were recovered from blesbok (Damaliscus dorcas phillipsi), African buffalo (Syncerus caffer), springbok (Antidorcas marsupialis), and black wildebeest (Connochaetes gnou) following organized culls in South Africa. Our objectives were 1) to characterize the quality of epididymal spermatozoa, 2) evaluate the effectiveness of a cryopreservation protocol, and 3) compare postthaw sperm longevity (motility, viability, and acrosomal integrity) and functionality in two culture media with two capacitation reagents (caffeine and heparin). Following recovery, spermatozoa were diluted in EQ extender, slow-cooled, and frozen in the presence of 5% glycerol. Thawed spermatozoa were separated on a Percoll gradient and diluted in fertilization media (SOF for fertilization [SOFfert]; 0.6% BSA, 0.0 mM glucose, 25.0 mM NaHCO(3)) or modified SOFfert (1.2% BSA, 1.5 mM glucose, 37.0 mM NaHCO(3)) and either heparin or caffeine, and incubated for 6 h. Spermatozoa from these species maintained an average of 64% initial motility after thawing. Incubation medium and capacitation reagent had species-specific effects on the motility, viability, and acrosomal integrity of spermatozoa, suggesting ART procedures need to be optimized for each species. Springbok spermatozoa were also shown to be competent for in vitro fertilization. Information from this study concerning sperm physiology in blesbok, African buffalo, springbok, and black wildebeest will be useful in the development of ART for the conservation of these and other species of bovids.

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Section: Discussionmentioning

confidence: 99%

Postthaw Evaluation of In Vitro Function of Epididymal Spermatozoa from Four Species of Free-Ranging African Bovids1

Herrick

Bartels

Krisher

2004

Biology of Reproduction

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“…However, our lower SC values are in contrast with those of Chacon et al (1999), who found lower SC values in the period September to February while our study recorded lower SC values between May and June. Chacon et al (2002) found that every unit increase in BCS was followed by an increase of 0.7cm in SC. These results are in line with the findings of our study where BCS was found to have a positive relationship with SC.…”

Section: Resultsmentioning

confidence: 96%

“…The current study revealed that higher SC values were obtained during the period between July to August which agrees with Chacon et al (1999) who found higher SC values between March and August. The higher SC values obtained during this period could be due to favourable temperatures in the period leading to an increased feed intake or a higher consumption of pastures by the animals and a higher digestibility of pastures during this period; this in turn leads to an improved BCS which directly affects SC (Chacon et al, 2002). However, our lower SC values are in contrast with those of Chacon et al (1999), who found lower SC values in the period September to February while our study recorded lower SC values between May and June.…”

Section: Resultsmentioning

confidence: 99%

Untitled

2017

IJAPR

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“…Seminal characteristics in bulls are affected by many factors, including age, testicular volume, dietary nutrition, time and place of the reproductive evaluation, environmental seasonality, and body condition (CHACON et al, 2002;FUERST-WALTL et al, 2006). Reproductive parameters, such as SC and BBSE, are commonly used to estimate the potential for individual bull fertility (FORDYCE et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Candidate genes related to reproductive traits of Hereford and Braford bulls

Menegassi

Pereira

Aguiar

et al. 2018

SCA

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This study emphasized the importance of using candidate genes in predicting semen quality in bulls that can be used in cow-calf production. The aim of this study was to evaluate some candidate genes related to reproductive traits in Braford and Hereford bulls. All bulls (n=188) were submitted to breeding soundness evaluations at 24, 28, 32, and 36 months of age. The microsatellite markers ILSTS002 and BMS3004 associated with the luteinizing hormone-β (LHβ) gene, IDVGA-51 to leptin (LEP) gene, HEL5 and AFZ1 within the IGF-IR gene, and two SNP markers (LHR and FSHR) associated with the LHR and FSHR genes, respectively, were evaluated by the amplification of DNA products. The variation in the IDVGA-51 allele 177-185 showed polymorphic information content (PIC) associated with sperm motility and vigor traits in Hereford bulls. Hereford animals showed PIC of 0.36 to 0.75% along with expected heterozygosity (H) of 0.49 to 0.78%. Braford bulls that indicated the ILSTS002 allele 137-175 and AFZ1 allele 113-119 showed PIC associated with major and minor defects, respectively. The PIC ranged from 0.28 to 0.78%, with an expected H of 0.35 to 0.81%. AFZ1 allele 121-127 had the highest minor defects and ILSTS002 allele 125-135 showed the highest major defects from ejaculated semen in Braford bulls. In addition, IDVGA-51 allele 175 showed lower motility and vigor in Hereford bulls. The markers AFZ1 (IGF-IR) and ILSTS002 (LHβ) in Braford and IDVGA-51 (LEP) in Hereford bulls were effective in verifying the reproductive traits of the bulls. Key words: Molecular markers. Single nucleotide polymorphisms. Microsatellites. Genetic variability. Braford and Hereford breeds. ResumoEste estudo enfatizou a importância do uso de genes candidatos na predição da qualidade do sêmen em touros que podem ser utilizados na produção de bezerros. O objetivo deste estudo foi avaliar alguns

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Seasonal variations in testicular consistency, scrotal circumference and spermiogramme parameters of extensively reared Brahman (Bos indicus) bulls in the tropics

Cited by 28 publications

References 28 publications

Postthaw Evaluation of In Vitro Function of Epididymal Spermatozoa from Four Species of Free-Ranging African Bovids1

Postthaw Evaluation of In Vitro Function of Epididymal Spermatozoa from Four Species of Free-Ranging African Bovids1

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Candidate genes related to reproductive traits of Hereford and Braford bulls

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