Late-gestation treatment of pregnant cows with trenbolone acetate does not increase subsequent growth of heifer calves

Journal of Animal Science
M A HartingJ J Reeves

Abstract

Fifty crossbred cows (38 multiparous and 12 nulliparous) were used to evaluate in utero androgenization of heifer calves with trenbolone acetate. Three 200-mg trenbolone acetate (Finaplix-H) implants were implanted in the ear of treated cows (n = 24) on d 214 +/- 11 of gestation; the remaining animals (n = 26) were used as controls. Cows' rate of gain, serum levels of trenbolone acetate, gestation length, degree of dystocia, percentage bred back, days until conception, and 24-h milk production were evaluated. Fourteen-day weigh periods until parturition indicated that trenbolone acetate-treated dams had an increased (P < .05) average daily gain (1.05 +/- .1 kg) compared with control cows (.55 +/- .1 kg). Serum concentrations of trenbolone acetate were higher (P < .01) in treated cows with a peak at 9 d after implantation and returned to basal concentrations by d 77. Treatment did not affect degree of dystocia among all cows (P > .05) but seemed to increase (P < .01) the incidence of dystocia in nulliparous cows compared with nulliparous control cows. Gestation length and subsequent fertility were not affected by treatment (P > .05). Similarly, there was no difference in 24-h milk production (P > .05) between treated and control...Continue Reading

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