Effects of Zeranol on Weight Gain, Bone Growth and Other Carcass Traits in Steers and Bulls

Chaudhary, Z. I.; Price, M. A.; Makarechian, M.

doi:10.4141/cjas85-098

Cited by 3 publications

(5 citation statements)

References 18 publications

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“…Similar to the present study, a study in prepubertal heifers implanted with oestradiol and fed a high-quality diet (16% CP, 16% ADF, 26% NDF and 2.66 Mcal/kg) did not increase wither height, heart girth and hip width (Lammers et al 1999). In contrast to the current experiment, steers and bulls that received oestrogen and testosterone based implants (140 mg of TBA and 36 mg of Zeranol) showed no implant effect on increasing HH compared to non-implanted bulls (Chaudhary et al 1985). The discrepancy was TE2 based implant in the present experiment did decrease ultimate HH gain whereas their study did not find any differences between TBA and control.…”

Section: Endocrine and Blood Metabolitescontrasting

confidence: 79%

“…Loy et al (1988) reported that oestrogen and testosterone implanted steers had higher HH, wither height and body length at slaughter compared to control steers receiving no implants. In contrast, other studies found that HH for both implanted and non-implanted animals was similar at the same age and implanted steers had shorter femurs compared to control animals (Chaudhary et al 1985;Unruh et al 1986). However, there is very little information about the elongation of bone at the cellular level from cattle treated with testosterone or oestrogen-based implants.…”

Section: Steroidal Based Hormonesmentioning

confidence: 90%

“…Androgen-based implants improve LWG by stimulating skeletal muscle growth and can increase LWG in many growing livestock species (i.e. steers, lambs and heifers) (Chaudhary et al 1985;Loy et al 1988;Rumsey et al 1992;Foutz et al 1997). It is likely the mode of androgen actions is through increasing protein accretion and muscling so implanting animals with an androgen based HGP could potentially increase meat production and carcass yield.…”

Section: Steroidal Based Hormonesmentioning

confidence: 99%

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Skeletal growth in cattle in response to nutritional and hormonal manipulation

Antari¹

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Section: Endocrine and Blood Metabolitescontrasting

confidence: 79%

Section: Steroidal Based Hormonesmentioning

confidence: 90%

Section: Steroidal Based Hormonesmentioning

confidence: 99%

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Skeletal growth in cattle in response to nutritional and hormonal manipulation

Antari¹

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“…Anabolic implants also have been shown to increase skeletal maturity (Foutz et al, 1997;Paisley et al, 1999) and skeletal growth (Hutcheson et al, 1997). Chaudhary et al (1985) and Unruh et al (1986) reported that bulls implanted with zeranol from birth had decreased measures of bone weight and growth and increased skeletal maturity when compared to nonimplanted bulls. This increase in bone maturity was attributed to the estrogens in the implant contributing to the aging process of skeletal tissue through decreasing bone and cartilage growth.…”

Section: Influence Of Anabolic Implants On Tissue Growth and Developmentmentioning

confidence: 99%

Optimizing carcass value and the use of anabolic implants in beef cattle

Montgomery

Dew

Brown

2001

Journal of Animal Science

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The historical use of implants in ruminants dates to 1947 with the first implanting of Hereford heifers with diethylstilbestrol. Since that time, several different implants have been developed with varying degrees of commercial success. It is recognized that the use of anabolic implants in beef cattle offers the greatest return on investment outside of ensuring adequate nutrition. Although this may be true with respect to increased weight gain and improved feed efficiency, the influence of anabolic implants on carcass characteristics has not all been positive. Since the early use of diethylstilbestrol, packers have been concerned about the influences of implants on meat tenderness and carcass value as indicated by quality grade. This concern has been renewed and amplified with the increased use of anabolic implants and the introduction of combination implants. Estrogenic, trenbolone acetate, and combination implants used today have been shown to increase live performance, rate of empty body protein

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“…Few studies have evaluated the effect of sex on EBW as proportion of SBW or HCW as proportion of EBW, but several have evaluated dressing percentage with mixed results. Hedrick et al [ 47 ] and Nichols et al [ 48 ] reported lesser dressing percentage, Vanderwert et al [ 49 ] reported no difference in dressing percentage, and others [ 50 , 51 , 52 , 53 , 54 , 55 , 56 ] have reported greater dressing percentage in bulls than steers and/or heifers particularly at heavier live weight. In our data, dressing percentage (0.58 vs. 0.57 and 0.56) was slightly greater in bulls than steers and heifers, respectively.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Equations to Predict Body Weight and Chemical Composition in Growing/Finishing Cattle and Effects of Publication Year, Sex, and Breed Type on the Deviation from Observed Values

Lancaster

2022

Animals

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Body weight and chemical composition are important aspects of beef cattle nutrition and management; however, existing equations estimating relationships among empty body and carcass chemical components were developed over 40 years ago using different cattle genetics and production systems. The objective of this analysis was to evaluate existing equations in predicting empty body and carcass chemical composition and determine the effect of sex, breed type, and publication year. A dataset was developed from published literature that contained 388 treatment means from 46 studies published between 1970 and 2020. Two equations relating shrunk body weight (SBW) to empty body weight (EBW), and 8 equations relating EBW and hot carcass weight (HCW) were found in the literature and evaluated using the developed dataset. Three sets of equations relating empty body chemical components, 4 sets of equations relating carcass chemical components, and 2 sets of equations relating carcass with empty body chemical components were found in the literature and evaluated using the dataset. Precision and accuracy of the equations were evaluated by simple linear regression of observed on predicted values, mean bias (MB), and concordance correlation coefficient (CCC). Additionally, the fixed effects of publication year, sex, and breed type on the deviation from observed values were evaluated using a general linear model. Both equations relating SBW to EBW and all equations relating EBW to HCW had high precision, but accuracy varied from −3.22 to −0.11% and −9.35 to −3.73% MB, respectively, and all the equations were affected by sex and breed type with 8 out of the 10 equations affected by publication year. For prediction of empty body chemical composition assuming empty body water is known, the 3 sets of equations varied in precision for protein (0.18 to 0.46), but not for fat (0.88 to 0.96) or ash (0.06 to 0.13) based on CCC, although the precision of prediction of protein and ash were poor. Accuracy of the 3 sets of equations varied for predicting empty body fat, protein, and ash with MB of −19.73 to −3.81, 1.67 to 15.91, and −0.16 to 15.75%, respectively. All 3 sets of equations were affected by publication year and breed type for predicting empty body fat, protein, and ash, and by sex for ash. For prediction of carcass chemical components assuming carcass water is known, the precision was similar among the 4 sets of equations for predicting fat (0.92 to 0.95), protein (0.34 to 0.40), and ash (−0.02 to −0.01) based on CCC, although precision was poor for protein and ash, but accuracy varied for prediction of carcass fat, protein and ash with MB of −11.20 to −2.52, 2.72 to 8.92, and −4.66 to 20.12%, respectively. Publication year and breed type affected the prediction of carcass fat and protein, and publication year, sex, and breed type affected the prediction of carcass ash for all 4 sets of equations. The precision of predicting empty body chemical components assuming carcass chemical components are known was high for water (0.96 and 0.98), fat (0.97 and 0.98), protein (0.97 and 0.97), and ash (0.98 and 0.96) and similar between the 2 sets of equations based on CCC. The accuracy of predicting empty body water (−1.68 and −0.33%), fat (6.38 and 2.70%), protein (0.85 and −0.54%), and ash (−0.65 and −4.54%) was moderate to high, but differed between sets of equations for fat and ash. Publication year influenced the prediction of empty body water for both sets of equations and ash for one of the equations, whereas, breed type influenced the prediction of water, protein, and ash, but not fat for both equations. Overall, existing equations may have major limitations to predicting empty body protein and ash unless carcass protein and ash are known. Additionally, all the equations were affected by some combination of publication year, sex, and breed type for one or more chemical components. Thus, a more robust set of equations should be developed to account for sex, breed type, and more recent cattle genetics and management systems.

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Effects of Zeranol on Weight Gain, Bone Growth and Other Carcass Traits in Steers and Bulls

Cited by 3 publications

References 18 publications

Skeletal growth in cattle in response to nutritional and hormonal manipulation

Skeletal growth in cattle in response to nutritional and hormonal manipulation

Optimizing carcass value and the use of anabolic implants in beef cattle

Assessment of Equations to Predict Body Weight and Chemical Composition in Growing/Finishing Cattle and Effects of Publication Year, Sex, and Breed Type on the Deviation from Observed Values

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