Effects of Zeranol on Skeletal Growth of Cull Cows and Heifers

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

doi:10.4141/cjas85-059

Can. J. Anim. Sci.

1985

DOI: 10.4141/cjas85-059

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Effects of Zeranol on Skeletal Growth of Cull Cows and Heifers

Z. I. Chaudhary¹,

M. A. Price²,

Sarah Butson³

et al.

Abstract: Thirty-two cull cows aged from I to 13 yr were allocated to five age groups and fed individually for 82 days, then slaughtered. Half of the cows within each group were implanted with 36 mg of zeranol . Zeranol had no significant effect on average daily gain, feed efficiency or backfat thickness, but caused a decrease in radio-ulna mass (P:0.10) and length (P:0.03). Rate of bone growth at the distal end of the radio-ulna decreased with increasing age to 0 at 4-5 yr.

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1997

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

Chaudhary¹,

Price²,

Makarechian³

1985

Can. J. Anim. Sci.

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Effects of Zeranol on Skeletal Growth of Cull Cows and Heifers

Cited by 2 publications

References 2 publications

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

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

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

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