Age had a significant (P ≤0,05) influence on greasy fleece mass and clean fleece mass. The staple length, fibre density and bodymas≤s were influenced highly significantly (P ≤5 0,01). Generation number had a significant (P ≤…
Significant changes have occurred in the beef cattle industry in the past few decades. Many of these changes have occurred because cattlemen have applied information provided by animal scientists. Some of these changes are crossbreeding, selection, meeting nutrient requirements of…
The profitability of semi-extensive beef production is discussed on the basis of information collected over a 4-year period from 23 farmers from northern Natal who participated in the mail-in record system. Throughout the analysis, the performance of the group average…
Use of forage analyses and the three dairy diet formulation programs has assisted Wisconsin dairy farmers to make greater progress toward highly competitive, profitable dairying. Acid· detergent fibre (ADF) has proven very satisfactory in…
Small stock production in South Africa is practised under a variety of conditions, each of which demands specific management inputs, disease control programmes, specific types of animals, and economic considerations. Improved small stock production involves close cooperation between the animal…
In this article progress attributable to genetic selection in the poultry industry is discussed in three sections: genetic progress in broilers and broiler breeders, in laying hens, and in disease resistance. Selection methods are evaluated and future objectives are suggested…
In spite of the obvious interdependence of animals and grasslands, both education and research in South Africa have been largely intra- rather than interdisciplinary. There are a number of possible reasons for this. Universities find it difficult to train prospective…
A study was undertaken to determine the relationship between the amino acid and crude protein content of maize using samples of yellow maize from the four main maize-producing areas of South Africa . After determining moisture, crude…
Two types of lucerne LPC were prepared by either adding the juice to hot water (85 °C) or by injecting steam until the juice reached a temperature of 85 °C after which the coagulum was freeze-dried. The resulting…
The administration of different doses (62,5; 125 or 250 μg per injection) of a prostaglandin analogue (cloprostenol) 14 days apart (in the double injection regime), proved that oestrus can be synchronized very efficiently in the Boer…
Forty-eight Sussex male calves were allotted at birth to the following three treatments: (i) castrated within 24 h after birth with elastrator rings and (ii) and (iii) castrated at 3 and 6 months using a burdizzo. Bodymass was…
Sixty Merino lambs were randomly allotted to one of six feeding levels. The feeding levels were: ad libitum (control) and 0,82; 0,72; 0,65; 0,55 and 0,45 of ad libitum. Feeding levels were calculated from the average weekly feed intake of…
Sixty Merino lambs were randomly allotted to one of six feeding levels. The feeding levels were ad libitum (control) and 0,82; 0,72; 0,65; 0,55 and 0,45 of ad libitum. The feeding levels were calculated from the average weekly feed intake…
Three complete diets with crude protein 16% and energy value 9,4 MJ ME/kg DM were formulated using different combinations of high and low-degradable protein sources. Diet A was formulated with only natural protein sources (55% UDP), diet A1 contained 1,6%…
Evaluation of South African protein sources: Use of dye-binding as measure of protein quality in fish-meal South African fish-meals differing in origin, composition and conditions of processing were evaluated for protein content, dye-binding capacity, dye-binding lysine, f1uorodinitrobenzenereactive lysine (FDNB), protein…
The effect of a dietary leucine imbalance on chickens was investigated. The two criteria considered were growth and antibody production following immunization with sheep red blood cells. Three groups of chickens were fed diets containing increasing levels of leucine. Group…
Utilization of apple residue in diets for lambs and milking cows The effect of replacing 0%, 33%, 66% and 100% of the maize meal with apple residue in a growth diet containing 45% roughage for lambs was investigated…
A series of 12 in vivo digestibility trials, using two-tooth Merino wethers were conducted on freshly-cut green kikuyu herbage. Samples of this herbage were analysed by proximate and acid-detergent analysis. A close relationship was found between crude fibre (CF) and…
