Comparison of Four Levels of Protein Supplementation with and without Oral Des on Reproductive Traits and Testosterone of Bulls

Tg, Martin; Re, Erb; Wl, Singleton; Fh, Owens

doi:10.2527/jas1979.4851033x

Cited by 7 publications

(2 citation statements)

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“…No effect of the DES treatment was observed on the levels of the androgens. This was contrary to a study in which there was a very small increase in the concentration of testosterone [38]. Since the observations are derived from only one animal treated with DES, more animal studies must be performed to confirm the observed results.…”

Section: Diethylstilbestrol Administrationcontrasting

confidence: 81%

Applicability of an innovative steroid-profiling method to determine synthetic growth promoter abuse in cattle

Blokland

Tricht

Ginkel

et al. 2017

The Journal of Steroid Biochemistry and Molecular Biology

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A robust LC-MS/MS method was developed to quantify a large number of phase I and phase II steroids in urine. The decision limit is for most compounds lower than 1ngml with a measurement uncertainty smaller than 30%. The method is fully validated and was applied to assess the influence of administered synthetic steroids and beta-agonists on the steroidogenesis. From three animal experiments, clenbuterol, diethylstilbestrol and stanozolol, the steroid profiles in urine of bovine animals were compared before and after treatment. It was demonstrated that the steroid profiles were altered due to these treatments. A predictive multivariate model was built to identify deviations from normal population steroid profiles. The abuse of synthetic steroids can be detected in urine samples from bovine animals using this model. The samples from the animal experiments were randomly analysed using this method and predictive model. It was shown that these samples were predicted correctly in the exogenous steroids group.

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Section: Diethylstilbestrol Administrationcontrasting

confidence: 81%

Applicability of an innovative steroid-profiling method to determine synthetic growth promoter abuse in cattle

Blokland

Tricht

Ginkel

et al. 2017

The Journal of Steroid Biochemistry and Molecular Biology

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“…The comparison of scrotal circumferences within the breed becomes more difficult as (i) the scrotal circumference is influenced by the age, the liveweight and even the maternal age (Coulter and Foote 1977;Martin et al 1979;Diaz and Mandlhate 1983;Lunstra et al 1988;Alencar et al 1989;Morris et al 1989); (ii) the abundant nutrition supply (e.g. 135% of the Total Dietary Nutrients (TDN)) increases the scrotal circumference (Seidel et al 1980); (iii) it is justifiable to take into consideration seasonal changes which also exist, because the scrotal circumference (correlation r = -0.22 and r = -0.38) is connected with the length of the day and the average daily temperature; and (iv) the size of the scrotal circumference, according to previous results (Swanepoel and Heyns 1990), is influenced considerably more by the rate of growth before weaning than thereafter.…”

Section: Introductionmentioning

confidence: 99%

Some Andrological Parameters of Charolais Breeding Bulls in Self‐performance Test

Mézes

Tőzsér

Nagy

et al. 1997

Reprod Domestic Animals

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ContentsThe authors invcstigated the effect of age on GnRH induced testosterone response and its correlation with body weight and some morphometric traits such as scrotal circumference, width of chest, height of shoulder, depth of chest in Charolais breeding bull candidates at the beginning and the end of the self-performance test in an age matched group ( & 30 days).It was found that the correlation in the case of age and testosterone content of blood serum before and after GnRH treatment was low. The multiple correlation with morphomctric traits i s moderate which supports the well-known effect of testosterone on muscle formation.Moderate or close correlation was found in respect of GnRH test results and scrotal circumference and those correlation remained the same at the beginning and the end of the selfperformance test, which suggests the possibility of early selection of breeding bull candidates.The relatively high individual variance among the bulls in the case of GnRH test results and some morphometric traits suggest some endocrinological differences among the different types of bulls within the same genotype and it would be a possible marker for type-selection. Inhalt Einige andrologische Parameter bei Charolais-Zuchtbullen im EigenleistungstestEs wurde ein Alterseffekt auf die durch GnRH induzierte Testosteron-Antwort und die Korrclation zu Korpergewicht und einigen morphometrischen Parametcrn, wie Umfang des Hodensacks, Brustumfdng, Schulterhohe, Tiefe der Brust bci Charolais-Bullen zu Beginn und am Ende eines Eigenleistungstests in altersabhingigen Gruppen (+30 Tage) untersucht.Dabci wurde herausgefunden, dab die Korrelation zwischen Alter und Bluttestosterongehalt vor und nach GnRH-Behandlung nur schwach ausgespragt ist. Die multiple Korrelation zwischen morphometrischen Werten war eher maBig und bestatigt damit die gut bekannten Effekte von Testosteron auf die Muskelausbildung. Hinsichtlich der AbhBngigkeit von GnRH und Hodensackumfang wurden mittelmiiDige his hohe Korrelationen gefunden und waren zu Beginn und am Ende der Eigenleistungspriifung gleich. Hieraus la& sich die Moglichkeit ableiten, bei zuchtbullen eine friihe Sclektion vorzunehmen.Die relativ hohe individuelle Varianz zwischen Bullcn bei den GnRH-Ergebnissen und bei einigen morphologischen Ergebnissen lassen auf unterschiedliche endokrinologische Muster zwischen verschiedenen Rullentypen innerhalh des selben Genotyps schliel3en. Dieses kiinnte als moglicher Marker fur eine Typenselcktion verwendet wcrden.

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Seasonal variation in serum levels of steroid hormones and their relation with seminal quality and libido in buffalo bulls

Dixit

Agarwal

et al. 1985

Theriogenology

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Comparison of Four Levels of Protein Supplementation with and without Oral Des on Reproductive Traits and Testosterone of Bulls

Cited by 7 publications

References 0 publications

Applicability of an innovative steroid-profiling method to determine synthetic growth promoter abuse in cattle

Applicability of an innovative steroid-profiling method to determine synthetic growth promoter abuse in cattle

Some Andrological Parameters of Charolais Breeding Bulls in Self‐performance Test

Seasonal variation in serum levels of steroid hormones and their relation with seminal quality and libido in buffalo bulls

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