Growth patterns of 182 cows [73 Angus (AA), 31 Charotais (CC), 38 Charolais x Angus (CA) and 40 Holstein x Angus (FA)] were studied from birth to maturi ty. Breed type significantly affected weight and condition at all ages. Crossbred cows were heavier than AA and lighter in weight than CC cows (P<.01) at all periods. Differences between CA and FA cows were small. The CA cows were somewhat heav...

Growing and mature rats were examined for the effect of a change in dietary protein requirements on the induction of liver serine dehydratase (SDH). The rats were fed on diets varying in casein content, and the weight change and nitrogen balance was determined. SDH activity and its gene expression were induced in both growing and mature rats when their protein intake exceeded their nutritional ...

In the arid sweetveld regions of South Africa producers are marketing beef steers increasingly as long weaners (ca. 12 months of age) or finishing them on the natural grazing to a ready-to-slaughter stage at between 18 and 30 months of age. Limited production norms in this regard are available since most growth and carcass studies have been conducted in the sourveld regions of the country. In t...

Three non-linear growth models were used to fit weight-age data for seven chicken genotypes: Comparisons made among these goodness of fit, biological interpretability and computational case. Monomolecular Richards Models overestimated body weight at the early phases growth. All three underestimated asymptotic mature but Gumpertz function gave a better estimate than other two. Maturing rates als...

The mature core protein of the Hepatitis C virus (HCVC173) carrying pelB as a signal peptide (PelB::core) was overexpressed in Escherichia coli as 18% and 23.3% of the host’s total protein, in flask and fermentor cultivation, respectively. A final specific yield of 25 ± 1 mg HCVC173/g dry cell weight and an overallproductivity of 51±1 mg HCVC173/l/h were obtained in the stirred-tank ferme...