A description of the findings from bull breeding soundness evaluations and their association with pregnancy outcomes in a study of western Canadian beef herds

Waldner, Cheryl L.; Kennedy, Richard I.; Palmer, Colin W.

doi:10.1016/j.theriogenology.2010.04.012

Cited by 40 publications

(33 citation statements)

References 13 publications

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“…This is an indication that genes that contributed to BW had an influence in the reproductive ability of rams. Scrotal circumference is a simple repeatable method of measurement of testicular size which is highly correlated with testicular weight, semen quality, and with fertility (Waldner et al, 2010). The present findings demonstrated that BCS is a good indicator of BW.…”

Section: Discussionsupporting

confidence: 57%

Evaluation of Three Mathematical Functions to Describe the Relationship Between Body Weight, Body Condition and Testicular Dimensions in Yankasa Sheep

Yakubu

Musa-Azara

2013

Int. J. Morphol.

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SUMMARY:Body size and testicular measurements have been found to be important parameters utilized in breeding soundness evaluation. The present study therefore, aimed at determining the relationship between body weight (BW), body condition score (BCS), testicular length (TL), testicular diameter (TD) and scrotal circumference (SC) in 120 extensively reared Yankasa rams (approximately 30 months old) using linear, quadratic and cubic predictive models. Coefficient of determination (R 2 ), Adjusted R 2 , the estimate of Mallows' Cp, RMSE (Root mean squares error) and the parsimony principle (p=number of parameters) were used to compare the efficiency of the different models. Strong Pearson's correlation coefficients (r = 0.83-0.94; P<0.01) were found between BW, TL, TD and SC. Spearman correlations between BCS and other variables were also highly significant (r = 0.78-0.85; P<0.01). SC was the sole variable of utmost importance in estimating BW, which was best predicted using the cubic model. However, the optimal model for BW prediction comprised TD, SC and BCS with p, R The present findings could be exploited in husbandry and selection of breeding stock for sustainable sheep production especially within the resource-poor farming system under tropical and subtropical conditions.

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Section: Discussionsupporting

confidence: 57%

Evaluation of Three Mathematical Functions to Describe the Relationship Between Body Weight, Body Condition and Testicular Dimensions in Yankasa Sheep

Yakubu

Musa-Azara

2013

Int. J. Morphol.

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“…In addition, we also observed a higher H (77%) and PIC (0.73%) when ILSTS002 was evaluated in our Braford population. Cows with the ILSTS002 allele (135 and 137 bp) showed lower viable embryos and higher calving intervals, indicating a disadvantage in reproductive performance in this species (SILVEIRA et al, 2013;WEIMER et al, 2007). In our study, we observed an increase in minor spermatozoa defects in bulls carrying a longer AFZ1 allele (121 and 127 bp) compared to animals carrying the short allele (113 and 119 bp).…”

Section: Discussionsupporting

confidence: 45%

“…Studies indicate that candidate genes may be used as an alternative biomarker for selecting bulls with acceptable semen quality parameters but also emphasize the importance of new studies to validate their results with larger samples in different cattle breeds (DEB et al, 2013(DEB et al, , 2015WALDNER et al, 2010). Studies on the genetic control of fertility in bulls are scarce, and this topic needs intensive investigation to meet future needs (DEB et al, 2015;HENRICKS et al, 1998).…”

Section: Introductionmentioning

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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“…These differences could be due to genetics, feeding management, and selection. Scrotal circumference is a simple repeatable method of measurement of testicular size which is highly correlated with testicular weight, semen quality, and with fertility (Waldner et al 2010;Kastelic and Thundathil 2008). In the present study based upon 128 Sahiwal breeding bulls, SC increased linearly from birth up till 25-30 months of age and then plateaued thereafter.…”

Section: Discussionmentioning

confidence: 56%

Relationship of age to body weight, scrotal circumference, testicular ultrasonograms, and semen quality in Sahiwal bulls

Ahmad

Naseer

et al. 2010

Trop Anim Health Prod

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The objective of the present study was to determine the relationship of age to body weight (BW), scrotal circumference (SC), number of pixels of testicular ultrasonograms (NP), and semen quality in Sahiwal bulls. The study was based on 128 Sahiwal bulls of different age groups (from 0 to >100 months of age). Bulls were evaluated for SC, BW, and NP. Semen was evaluated once a week for five consecutive weeks from regularly collected donor bulls (n = 86) ranging in age from 25-30 to >100 months. Ejaculate volume, sperm motility, sperm concentration, sperm morphology, percent live sperms, sperm plasma membrane integrity, and normal acrosome were compared among different age groups. Mean SC and BW increased (P < 0.05) in a curvilinear manner from birth to >100 months of age. Mean NP of testicular ultrasonograms increased (P < 0.05) from 0 to 24 months and then plateaued until >100 months of age. Body weight, SC, and NP were positively correlated with age from birth until >100 months (r = 0.91, 0.87, and 0.40, respectively). Ejaculate volume (5.7 ± 0.2 vs. 4.6 ± 0.09 ml) and sperm concentration (1,281.6 ± 17.7 vs. 1,115.8 ± 55.9 × 10(6)/ml) increased (P < 0.05) in mature bulls compared to younger ones. However, motility (68.6 ± 0.3%), plasma membrane integrity (50.8 ± 1.0%), and normal acrosome (74.8 ± 0.5%) remained insignificant due to age. In six of eight age groups studied, morphological abnormalities were well within the range (18.1 ± 0.3%). In conclusion, the BW, SC, and NP of testicular ultrasonograms, ejaculate volume, and concentration increased with age. Moreover, semen quality is fairly independent of age except volume and concentration in Sahiwal bulls.

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A description of the findings from bull breeding soundness evaluations and their association with pregnancy outcomes in a study of western Canadian beef herds

Cited by 40 publications

References 13 publications

Evaluation of Three Mathematical Functions to Describe the Relationship Between Body Weight, Body Condition and Testicular Dimensions in Yankasa Sheep

Evaluation of Three Mathematical Functions to Describe the Relationship Between Body Weight, Body Condition and Testicular Dimensions in Yankasa Sheep

Candidate genes related to reproductive traits of Hereford and Braford bulls

Relationship of age to body weight, scrotal circumference, testicular ultrasonograms, and semen quality in Sahiwal bulls

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