Thesis (M.S.)--Oregon State University, 1975. / Typescript (photocopy). Includes bibliographical references. Also available via the World Wide Web.

Thesis (PhD (Animal Science)(Meat Science)) -- University of Pretoria, 2006. / Includes bibliographical references.

Thesis (M.S.)--Royal Roads University, 2005. / Includes bibliographical references (leaf 71-75). Project presentation at BC Mountain Goat Workshop (March 1, 2005) also available electronically via Internet.

Thesis (Ph.D.)--University of Adelaide, Dept. of Animal Sciences, 1990. / Includes bibliographical references (leaves 246-280) and index.

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This study was conducted to evaluate the effect of season on the superovulatory ovarian response and embryo recovery rate in Boer goat does. Twenty mature does (mean body weight of 55 kg) were synchronised for oestrus with the aid of CIDR devices for a period of 17 days and superovulated with pFSH (Folltropin®-Vetrepharm) during the natural breeding season (n = 9) and non-breeding season (n = 11). The superovulation treatment entailed a total dose of 200 mg pFSH/doe given i.m. in 7 dosages at 12 h intervals, starting 48 h prior to CIDR removal (the first dose being 50 mg and all others 25 mg). Does were observed for signs of oestrous behaviour 3 times daily at 8 h intervals following CIDR withdrawal with the aid of teaser bucks to determine the onset and duration of the induced oestrous period. Cervical inseminations with 0.1 ml fresh undiluted semen were performed 36 and 48 h following CIDR removal and the embryos surgically flushed 6 days following the second AI. Recovered structures (ova and embryos) were microscopically evaluated and classified according to their morphology. The total number of structures in terms of unfertilised ova, fertilised ova, degenerated embryos and transferable embryos from each doe flushed was recorded. All the donor does exhibited oestrus during the breeding and non-breeding season with the mean period to the onset of oestrus (24.9±4.8 h) being significantly (P < 0.05) earlier during the natural breeding season, compared to the non-breeding season (30.5±9.1 h). The duration of the induced oestrous period was also significantly (P < 0.05) longer during the natural breeding season (24.0±5.7 h) than the non-breeding season (18.2±3.7 h). The mean ovulation rate per donor, total number of structures and embryos recovered per donor did not differ between seasons. The mean number of unfertilised ova per doe was significantly (P < 0.05) higher during the non-breeding season (3.3±2.8), compared to the natural breeding season (0.9±2.4). The total number of degenerated embryos and transferable embryos however, did not differ between seasons. Season as such had an effect on the onset and duration of the induced oestrous period; however, it did not affect the oestrous response. Therefore, it would seem that superovulation in the Boer goats is warranted, irrespective of season.

Ammonium chloride (NH4Cl) has been the primary preventive modality for struvite urolithiasis in goats. This study investigated the effect of continuous and pulse dose NH4Cl therapeutic regimens on urine pH in ten goats. The initial regimen (feed additive) consisted of 0.007% NH4Cl as a feed additive. Following this week long regime, the two treatment regimens were designed as a standard ten goat cross-over design. The first treatment regimen (continuous) consisted of daily administration of a titrated dosage of NH4Cl for ten days, followed by four days without treatment. The third treatment regimen (pulse) used daily administration of a titrated dose of NH4Cl for three consecutive days followed by four days without treatment for three treatment periods. Ammonium chloride dosages were titrated to result in a urine pH of < 6.5 (target level) prior to commencing treatment regimens. Urine pH was evaluated once daily during feed additive regimen and twice daily during the treatment regimens. A Bayesian methodology was used to determine the daily odds ratios for production of target urine pH during treatment regimens. The odds ratios were also calculated between pulse dosages during the pulse regimen. The feed additive regimen did not result in target urine pH within 7 days. Treatment with the continuous regimen resulted in target pH, however, pH returned to >6.5 within five days, (odds ratio 0.23-1.56 at Treatment Time 10). The odds ratios for each pulse period of the pulse dose regimen were 2.20-7.45, 0.41-1.68 and 1.59-5.62 respectively. The results of this study indicate that variability in response to therapy warrants titrating individual dosages of NH4Cl, continuous therapy results in a loss of effectiveness, and pulse dosage is effective in repeatedly producing a urine pH of <6.5.

Thesis (MMedVet. (Vet. Public Health))--University of Pretoria, 2003. / Includes bibliographical references.