Comparison of Anabolic Implants on Reproductive Function, Performance and Carcass Characteristics in Weaned Beef Bulls

Gordon, Seth; Miller, H. L.; Gee, D. H.; Evenson, Donald P.

doi:10.4141/cjas88-042

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Results similar to ours have been reported by Gordon et al (1988) for Angus bulls implanted ar22l d of age, Gray etal. (1986) for Simmental bulls implanted at 3 d of age and subsequently at 84-d intervals, Richards et al (1986) (1983) observed improved gain (6-10%) and feed conversion ratio (about 8%) in Angus bulls implanted from calftrood to slaughter at average intervals of 106 d, and were again considered to be neither statistically nor commercially significant (Jones et al 1986).…”

supporting

confidence: 82%

“…It has been established that the product will increase the growth rate and feed conversion efficiency of steers (Perry et al 1910) but implantation of intact bulls has given variable results. Some authors have observed increased growth (Butson et al 1983;Gill et al 1983;Grearhouse et al 1983; Gregory and Ford 1983), while several others have found no effect on growth (Bass et al 1984;Richards et al i986;Staigmiller et al 1985; Vanderwert et al 1985;Gray et al 1986; Gordon et al 1988 (Jones et al 1986), blood components and organ weights (Doornenbal et al 1987), meat texture (Jeremiah et al 1987a) and for meat-cooking properties and flavor (Jeremiah et al 1987b (Ball et al 1983) and testicle consistency (tonometer deflection (Hahn et al 1969 a-cTrait means not followed by the same letter are significantly different at P<0.05. For personal use only.…”

mentioning

confidence: 99%

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Effects of Zeranol Implantation on Growth, Feed Conversion, Testicular Development and Behavioral Traits of Young Bulls Fed for Slaughter

Newman¹,

Tennessen²,

Tong³

et al. 1990

Can. J. Anim. Sci.

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supporting

confidence: 82%

mentioning

confidence: 99%

Effects of Zeranol Implantation on Growth, Feed Conversion, Testicular Development and Behavioral Traits of Young Bulls Fed for Slaughter

Newman¹,

Tennessen²,

Tong³

et al. 1990

Can. J. Anim. Sci.

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“…These bulls, a 33month-old (bull 3) and a 21-month-old Hereford (bull 4) were from a different farm but were moved to the University of Florida in the same week as bulls 1 and 2. Testosterone assay was by solid-phase radioimmunoassay based on testosterone-specific antibody immobilized to the wall of polypropylene tubes (Gordon et al, 1988) (Coat-A-Count Total Testosterone; Diagnostic Products Corporation, Los Angeles, CAI.…”

Section: Methodsmentioning

confidence: 99%

Diadem/crater defects in spermatozoa from two related angus bulls

Larsen

Chenoweth

1990

Molecular Reproduction Devel

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The diadem/crater defect was studied over several months in two related 20-month-old Angus bulls. In bull 1, diadem/crater defects were present in 2-99% of ejaculated spermatozoa at various times during the evaluation period. In bull 2, affected cells varied from 20% to 94%, with other abnormalities (head and acrosome defects, coiled tails, proximal cytoplasmic droplets) also common. Single sire mating trials conducted over 26 days during an apparent recovery phase showed normal fertility (approximately 50% pregnancies per estrus exposed). Both resting and gonadotropin-releasing hormone (GnRH)-stimulated testosterone values were within nor-mal limits. Histopathological evaluation of testes showed no obvious hypoplastic, inflammatory, or degenerative condition. Electron microscopy of ejaculated spermatozoa demonstrated the characteristic diadem pattern of craters in the equatorial region of the head. Many cells from bull 2 contained large craters in other regions of the nucleus. Electron microscopy of testicular tissue demonstrated nuclear invaginations lined by a single unit membrane in round spermatids. Lesions in elongated spermatids were more pronounced, with curling of the nucleus and large membrane-filled cavities in the chromatin occurring in addition to craters in the equatorial region of the nucleus.

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Natural sex steroids and their xenobiotic analogs in animal production: Growth, carcass quality, pharmacokinetics, metabolism, mode of action, residues, methods, and epidemiology

Lone

1997

Critical Reviews in Food Science and Nutrition

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Natural and xenobiotic compounds having sex-related actions have long been used for growth promotion and various changes in carcass quality in meat animals. The first compounds used were synthetic estrogens; however, later on a whole battery of compounds having androgenic, and progestogenic actions have also been involved. In surveying the effects of these compounds in meat-producing animals, it became clear that these drugs increase the growth rate of the treated animals and bring about changes in the carcass that are generally characterized by lower fat content and more lean mass. Extensive studies undertaken in various countries, including the European Economic Community (EEC), have shown that if used according to good husbandry practices, the meat from treated animals does not have excessive amounts of residues compared with the endogenous amount of steroid production in the animals in question and also in human beings. The banning of these compounds in the European community brought a new phenomenon of illegal or black market cocktails. These mixtures of anabolic steroids are injected into the body of the animals rather than implanted in the ears, which is the normal practice in countries where they have not yet been banned. Several screening and confirmatory methods are now available for monitoring programs. However, these programs need excessive resources in terms of manpower, funds, and proper legislation, which in underdeveloped countries is questionable, particularly in the absence of strong scientific evidence for the exercise.

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Comparison of Anabolic Implants on Reproductive Function, Performance and Carcass Characteristics in Weaned Beef Bulls

Cited by 3 publications

References 4 publications

Effects of Zeranol Implantation on Growth, Feed Conversion, Testicular Development and Behavioral Traits of Young Bulls Fed for Slaughter

Effects of Zeranol Implantation on Growth, Feed Conversion, Testicular Development and Behavioral Traits of Young Bulls Fed for Slaughter

Diadem/crater defects in spermatozoa from two related angus bulls

Natural sex steroids and their xenobiotic analogs in animal production: Growth, carcass quality, pharmacokinetics, metabolism, mode of action, residues, methods, and epidemiology

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