Degree Type

Thesis

Date of Award

1-1-2001

Degree Name

Master of Science

Department

Veterinary Clinical Sciences

Major

Veterinary Clinical Sciences

Abstract

There was a significant relationship between body weight at the time of bulling activity and day 1 rectal temperature (P=0.002). The relationship between body weight at the time of bulling and day 3 rectal temperature was not significant (P=0.31). Analysis of the categorical variables found that the condition of growth hormone implants at the time of bulling did not differ between groups (P = 0.27). Day 1 serum estradiol 17[beta] concentration was significantly different between groups (P=0.05). The 4 steers that had detected-quantified levels of estradiol 17[beta] on day 1 were riders. One buller and 1 control had detected-not quantified levels of estradiol 17[beta] on day 1. The available data support the hypothesis that the rider steer has elevated estradiol 17[beta] at the time of bulling activity as compared to the buller and uninterested pen mates. The results of this study suggest that the rider should be scrutinized as closely as the buller in future studies.The following parameters were recorded and analyzed in rider steers (n=17), buller steers (n=6), and control steers (n=18) at the time of bulling activity: body weight on day 1, rectal temperature on day 1 and 3, implant condition on day 1, and serum hormone concentrations of trenbolone, trenbolone acetate, testosterone, progesterone, and estradiol 17[beta] on day 1 and 3. Day 1 was considered the day of initial bulling activity. The data was analyzed for differences among the variables between the 3 steer groups. Continuous variables included weight at the time of bulling, and rectal temperature on day 1 and 3. Categorical variables included serum hormone concentrations on day 1 and 3, and growth hormone implant condition. Analysis of the continuous variables indicated that body weight at the time of bulling did not differ between groups (P=0.99). Rectal temperature at the time of bulling did not differ between groups (P=0.93), and the rectal temperatures on the third day post bulling activity did not differ between groups (P=0.80).

Copyright Owner

Brent David Meyer

Language

en

OCLC Number

46982000

File Format

application/pdf

File Size

37 pages

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