Certain facets of comparative beef production from bulls, steers and heifers were investigated. Growth rate, final carcass mass, efficiency of feed utilization and several carcass measurements served as parameters for the purpose of comparison. From birth to twelve months of…
Some aspects of the effect of supplementary energy and/or protein, strategically provided to steers on summer veld, were investigated. 40 Friesland steers in the age group 12 to 18 months were divided into four groups and received the following treatments…
Although molasses is extensively used in the animal feed industry in South Africa, there are conflicting views on its value as an energy source, Because of its low cost in relation to that of maize and in view of the…
Four fish meals were subjected to a Nett Protein Utilization (NPU) study of which two were then tested in broiler rations. The NPU values revealed significant differences between fish meals but the broiler growth rate failed to indicate differences in…
In a study aimed to establish whether prolactin secretion in lactating ewes influences the release of LH, and the response of the ovary to gonadotropin stimulation, 20 Merino ewes which lambed over an eight-day period were divided into two comparable…
The effect of shortening gestation with hormones on pelt characteristics of Karakul lamb: Two hundred and eighty two pregnant Karakul ewes were used in an experiment which was conducted with ewes mated out of the normal breeding season (October to…
Ninety eight lactating Bonsmara cows were divided into an experimental group of 66 and a control group of 32 cows. The 66 cows were synchronized by means of the interrupted method of progesterone administration and thereafter inseminated during the first…
The effect of time of evisceration on pH and certain other characteristics of pork muscle. During surveys at pig slaughter centres In South Africa. it was noted that at some centres the carcasses were eviscerated within 8 min. post mortem…
The urea dilution technique for the determination of body water and body fat in vivo was compared with the tritiated water dilution technique with respect to accuracy. ease of determination, costs, and application possibilities. Nineteen sheep were used in the…
The influence of milking interval on milk production The influence of milking intervals of 12, 16, 20 and 24 hours on milk production was studied in 24 Friesian cows for an experimental period of 60 days. Milk, fat and protein…
120 Lactating Karakul ewes were randomly divided into 12 equal groups. Two main groups nursed lambs until medroxiprogesterone acetate impregnated sponges (Repromap, Upjohn) were inserted at 28, 38 and 48 days post partum (non-lactating) or until 90 days post partum…
The approximate method for calculating coefficients of inbreeding from pedigrees presented by Wright & McPhee (1925). Is generalized to accommodate different methods of sampling random lines of descent.
