Standardising bull breeding soundness evaluations and reporting in Australia

Fordyce, Geoffry; Entwistle, Keith; Norman, Scott; Perry, V.E.A.; Gardiner, Ben; Fordyce, Patrick

doi:10.1016/j.theriogenology.2006.03.009

Cited by 55 publications

(56 citation statements)

References 5 publications

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“…AGECL was estimated from annotation of the date when the first CL was observed and the date of birth. Scrotal circumference (SC) was measured with a standard metal tape (Fordyce et al 2006). Between weaning and 24 months of age, eight measurements of SC were taken for each bull, at 3-month intervals.…”

Section: Cattle and Traitsmentioning

confidence: 99%

Finding genes for economically important traits: Brahman cattle puberty

Fortes

Lehnert

Bolormaa³

et al. 2012

Anim. Prod. Sci.

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Abstract. Age at puberty is an important component of reproductive performance in beef cattle production systems. Brahman cattle are typically late-pubertal relative to Bos taurus cattle and so it is of economic relevance to select for early age at puberty. To assist selection and elucidate the genes underlying puberty, we performed a genome-wide association study (GWAS) using the BovineSNP50 chip (~54 000 polymorphisms) in Brahman bulls (n = 1105) and heifers (n = 843) and where the heifers were previously analysed in a different study. In a new attempt to generate unbiased estimates of singlenucleotide polymorphism (SNP) effects and proportion of variance explained by each SNP, the available data were halved on the basis of year and month of birth into a calibration and validation set. The traits that defined age at puberty were, in heifers, the age at which the first corpus luteum was detected (AGECL, h 2 = 0.56 AE 0.11) and in bulls, the age at a scrotal circumference of 26 cm (AGE26, h 2 = 0.78 AE 0.10). At puberty, heifers were on average older (751 AE 142 days) than bulls (555 AE 101 days), but AGECL and AGE26 were genetically correlated (r = 0.20 AE 0.10). There were 134 SNPs associated with AGECL and 146 SNPs associated with AGE26 (P < 0.0001). From these SNPs, 32 (~22%) were associated (P < 0.0001) with both traits. These top 32 SNPs were all located on Chromosome BTA 14, between 21.95 Mb and 28.4 Mb. These results suggest that the genes located in that region of BTA 14 play a role in pubertal development in Brahman cattle. There are many annotated genes underlying this region of BTA 14 and these are the subject of current research. Further, we identified a region on Chromosome X where markers were associated (P < 1.00E-8) with AGE26, but not with AGECL. Information about specific genes and markers add value to our understanding of puberty and potentially contribute to genomic selection. Therefore, identifying these genes contributing to genetic variation in AGECL and AGE26 can assist with the selection for early onset of puberty.

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Section: Cattle and Traitsmentioning

confidence: 99%

Finding genes for economically important traits: Brahman cattle puberty

Fortes

Lehnert

Bolormaa³

et al. 2012

Anim. Prod. Sci.

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“…The Society for Theriogenology standard makes provision for classification to be deferred pending further evaluations in bulls which do not fully satisfy the criteria for a satisfactory potential breeder [9]. The Australian standard classifies bulls as fertile, subfertile or infertile depending on the parameters for different traits [10].…”

Section: Discussionmentioning

confidence: 99%

“…This parallels the situation in other countries, where similar requirements for standardisation resulted in the development of guidelines for bull breeding soundness certification by the Society for Theriogenology in 1983 [8], with an updated set of guidelines being published in 1993 [9]. A recent article describes the process of devising an industry standard for examination of bulls in Australia [10]. In this context the revised South African standard of 2000, which has been in use for six years and has been recently updated, is presented here.…”

Section: Introductionmentioning

confidence: 86%

Bull breeding soundness evaluation in Southern Africa

2007

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“…Ten 2-yr-old Santa Gertrudis bulls with a mean initial live weight of 794.0 kg (SD 55.6) were selected for use in this study. The bulls were selected from a seed stock herd -ern Queensland, Australia, and then transported 260 -periment were based on bulls having passed consecutive standardized bull breeding soundness evaluations (Entwistle and Fordyce, 2003;Fordyce et al, 2006), -logically normal spermatozoa at both evaluations. Bulls were administered vitamin A, D, and E (Vitamec ADE; Cattlekare, Dandenong, VIC, Australia; 5 mL intramuscular [i.m.])…”

Section: Animals and Managementmentioning

confidence: 99%

“…Samples were allowed to clot at room temperature and then centrifuged (3,000 × g for -FSH, testosterone, inhibin, and cortisol concentrations. Bull breeding soundness examinations were performed according to the standardized bull breeding soundness evaluation procedure (Fordyce et al, 2006), including semen analysis and categorization of sperm abnormalities. After preliminary stimulation via rectal massage to the ampullae, semen was collected using a Lane ejaculator (Lane Pulsator IV; Lane Manufacturing Inc., Denver, CO) and standard electroejaculation technique (Entwistle and Fordyce, 2003;McAuliffe et al, 2010).…”

Section: Measurement and Samplingmentioning

confidence: 99%

Subacute ruminal acidosis reduces sperm quality in beef bulls1

Callaghan

McAuliffe

Rodgers

et al. 2016

Journal of Animal Science

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk 3215 INTRODuCTIONBreeding bulls in Australia are commonly fed high-energy diets before sale, generally in the form of grain. These diets previously have been shown to negatively affect sperm quality in bulls (Coulter phenomenon has been associated with increased adipose tissue deposition in the scrotal neck, impairing thermoregulation via the pampiniform plexus (Kastelic et al., 1996). Elevation of testicular tem--duction and sperm viability (Vogler et al., 1993). However, anecdotal evidence from veterinary practitioners and semen morphology laboratories suggests that sperm production can be affected early in the sale preparation process, before fat deposition occurring (P. McAuliffe, personal communication). The rapid introduction of diets containing readily fermentable carbohydrates may precipitate ruminal acidosis AbSTRACT: Breeding bulls are commonly fed high-energy diets, which may induce subacute rumiGertrudis bulls (age 20 ± 6 mo) were used to evaluate the extent and duration of effects of SARA on semen quality and the associated changes in circulating hormones and metabolites. The bulls were relocated and fed in yards with unrestricted access to hay and daily individual concentrate feeding for 125 d before SARA challenge. Semen was collected and assessed at 14-d intervals before the challenge to ensure acclimatization and the attainment of a stable spermiogram. The challenge treatments consisted of either a single oral dose of oligofructose (OFF; 6.5 g/kg BW) or an equivalent sham dose of water (Control). Locomotion, behavior, respiratory rate, and cardiovascular and gastrointestinal function were intensively monitored during the retained for VFA, ammonia, and lactate analysis. After the challenge, semen was then collected every third day for a period of 7 wk and then once weekly until 12 wk, with associated blood collection for FSH, testosterone, inhibin, and cortisol assay. Percent normal sperm decreased in bulls dosed with OFF after the challenge period (P -lenge. There was a corresponding increase in sperm defects commencing from 16 d after challenge. These included proximal cytoplasmic droplets (P P = 0.01), and vacuole and teratoid heads (P -ity after challenge were associated with lower serum testosterone (P P cortisol in OFF bulls tended to be greater (P = 0.07) at 7 d after challenge. This study shows that SARA chalpreclude bulls from sale as single sire breeding animals 3 mo after the event occurred.

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Standardising bull breeding soundness evaluations and reporting in Australia

Cited by 55 publications

References 5 publications

Finding genes for economically important traits: Brahman cattle puberty

Finding genes for economically important traits: Brahman cattle puberty

Bull breeding soundness evaluation in Southern Africa

Subacute ruminal acidosis reduces sperm quality in beef bulls1

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