Genetic parameters of semen quality traits and genetic correlations with service sire nonreturn rate in Nordic Holstein bulls

Gebreyesus, Grum; Lund, Mogens Sandø; Kupisiewicz, Kasia; Su, Guosheng

doi:10.3168/jds.2021-20403

Cited by 22 publications

(11 citation statements)

References 16 publications

(33 reference statements)

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“…In accordance with other studies (Gredler et al, 2007;Gebreyesus et al, 2021), bull fertility was associated with several ejaculate characteristics. Correlation coefficients between ejaculate characteristics and male reproductive success are reported in Table 1.…”

Section: = ( )supporting

confidence: 92%

“…Ejaculate volume and sperm concentration were not correlated with sire nonreturn rate. The association between motility and sire nonreturn rate agrees with Gebreyesus et al (2021), where they observed a positive genetic correlation between post-thaw motility and fertility. In addition, Gredler et al (2007) identified a positive correlation between bull fertility and motility.…”

Section: = ( )supporting

confidence: 84%

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Bull fertility and semen quality are not correlated with dairy and production traits in Brown Swiss cattle

et al. 2022

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Undisturbed reproduction is key for successful breeding of beef and dairy cattle. Improving reproductive ability can be difficult because of antagonistic relationships with other economically relevant traits. In cattle, thorough investigation of female fertility revealed unfavorable genetic correlations with various production phenotypes. However, the correlation between male reproductive ability and production traits remains poorly understood. Here, we investigated the genetic relationships among and between male fertility characteristics and economically relevant traits in a population of Brown Swiss cattle. We performed GWAS with imputed genotypes at nearly 12 million sequence variants for semen quality (sperm head and tail anomalies, motility, concentration, and volume), male fertility, and 57 production phenotypes. Allele substitution effects were then correlated on a trait-by-trait basis to estimate genetic correlations. Correlations between male reproductive characteristics and traits of economic value were small and ranged from −0.0681 to 0.0787. Among the semen quality parameters, sperm motility was negatively correlated with anomalies (head: r = −0.7083 ± 0.0002; tail: r = −0.7739 ± 0.0002) and volume (r = −0.1266 ± 0.0003), whereas volume was negatively correlated with concentration (r = −0.3503 ± 0.0002). Sire nonreturn rate was negatively correlated with sperm anomalies (head: r = −0.1640 ± 0.0002; tail: r = −0.1580 ± 0.0002) and positively correlated with motility (r = 0.1598 ± 0.0002). A meta-analysis of male reproductive traits identified 2 quantitative trait loci: a previously described region on chromosome 6 showed pleiotropic effects and a novel region on chromosome 11 was associated with sperm head anomalies. In conclusion, our results suggest that selection for economically important dairy and production phenotypes has little impact on semen quality and fertility of Brown Swiss bulls.

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Section: = ( )supporting

confidence: 92%

Section: = ( )supporting

confidence: 84%

Bull fertility and semen quality are not correlated with dairy and production traits in Brown Swiss cattle

et al. 2022

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“…The study also reports significant effects of bull age on the IVP quality parameters. Effect of bull age have similarly been reported for male fertility related traits such as semen quality parameters (Olsen et al, 2020;Gebreyesus et al, 2021). Semen from younger bulls appear to result in higher blastocyst and hatch rates as well as BLxMxK score at day 7 and 8 after fertilization.…”

Section: Discussionmentioning

confidence: 72%

487. Bull effects on in vitro embryo production quality traits are repeatable and heritable

Gebreyesus

Secher

Lund

et al. 2022

Proceedings of 12th World Congress on Genetics Applied to Livestock Production (WCGALP)

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In this study, in vitro production of embryos (IVP) was performed using oocytes aspirated from slaughterhouse ovaries and fertilized with ejaculates from 123 bulls aged between 10-and 92 months at semen collection. The restricted maximum likelihood approach was used to estimate genetic parameters for embryo production quality traits including blastocyst rate, hatch rate and an index trait combining Blastocyst rate, Kinetic Score, and Morphology score (BLxMxK). A total of 259 records were available for analysis. The results indicate that bulls at a younger age had better performances in all the studied IVP traits compared to bulls at later ages. The results also show low to high heritability and moderate to high repeatability for the IVP traits, suggesting the possibility of implementing selective breeding of bulls for better IVP performance.

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“…A deficiency in breeding capability of one bull has a huge impact on herd productivity, since individual bull service numerous females [1]- [4]. There are substantial differences in fertility among particular bulls [5]. Previous studies indicate, maximum fertility was similar for herds versus males.…”

Section: Introductionmentioning

confidence: 99%

Breeding Soundness Inspection and Production Features of Bullocks under Ecological Conditions in Free State Region, South Africa

Zuma-Netshiukhwi

Netshilema

Nongovhela

2022

EJFOOD

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Assessing the fertility of bullocks preceding to use as breeding animals make apparent economic if it were possible. Fertility is not possible predicted by means of a breeding soundness evaluation (BSE), but by the application of minimum standards to a set of accepted procedures, which supports informed decision makers to the breeding potential of the bullock. An bullocks found to satisfy these criteria in Central Performance Testing (CPT) known as Phase C, is reckoned to be breeding sound (BS). Furthermore, breeding success depends on the reproductive performance of both the cow and the bull. Breeding bull is likely to service a large number of heifers or cows in planned breeding season. The efficiency of a bullock can be based on the average daily gain (ADG) and feed conversion ratio (FCR) but poor breeding sound evaluation can be regarded as infertile. Bull breeding soundness evaluations (BSEs) are significant economic management of beef herd management and depends on adequate semen quality, physical soundness and serving capacity. Furthermore, assessment of scrotal circumference (SC), libido, testicular measurement and semen parameters often not done during a routine breeding soundness examination. The aim of this study was to depict using BSE whether bullocks would be fertile under Phase C. The relationship of BSE and production characteristics in central performance testing is challenging to identify fertility in bullocks within 112 given days of CPT. This study investigated performance data extracted from Integrated Registration and Genetic Information System (Intergis) managed by Agricultural Research Council Glen Bull Testing Centre. There were three breeds investigated, namely, Simmentaler, Santa Gertrudis and Limousin for the period of 2007 to 2017, were analysed to determine the dominance and importance of factors affecting breeding soundness classification.

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Genetic parameters of semen quality traits and genetic correlations with service sire nonreturn rate in Nordic Holstein bulls

Cited by 22 publications

References 16 publications

Bull fertility and semen quality are not correlated with dairy and production traits in Brown Swiss cattle

Bull fertility and semen quality are not correlated with dairy and production traits in Brown Swiss cattle

487. Bull effects on in vitro embryo production quality traits are repeatable and heritable

Breeding Soundness Inspection and Production Features of Bullocks under Ecological Conditions in Free State Region, South Africa

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