A group of slow-growing Landrace and a group of fast-growing Large White boars were used to study their patterns of feed intake, growth rate and feed utilization. The pigs were fed ad libitum on a high-energy diet of a high…
The digestible energy (DE) content of milled and whole class FH sunflower seed (SS) was determined in a digestion trial and found to be respectively 18,7 and 9,9 MJ/kg on an air dry basis. Two diets for early weaned piglets…
Twelve non-lactating Boer goat does with live masses ranging between 20 and 60 kg and of different body fatness were used to develop equations predicting body moisture, protein, ash and fat from tritiated water space. Calculated coefficients of variation, with…
Two studies involving 270 yearling steers were conducted to compare four growth promotants (three estrogenic and one androgenic). These represented short, medium and long-acting compounds and were implanted into steers that were grazing natural pasture and were finished…
The relationship between the chemical composition of kikuyu and the dry matter intake (DMI), digestibility of the chemical fractions and digestible organic matter (DOM) of kikuyu was investigated. The chemical composition and in vivo digestibility of kikuyu were determined throughout…
Genetic parameters of weaning traits of Hereford calves. The inheritance and interassociation of weaning traits for 912 Hereford calves, the progeny of 22 sires, collected over a period of 11 years, were studied. The estimates of heritability of the…
The effect of a copper deficiency on certain aspects of reproduction in ewes was investigated. An effective copper deficiency was induced by using the copper antagonists cadmium, calcium and sulphate. An average decline in the plasma copper concentration from 160…
The influence of body parameters on the reproductive performance of Karakul ewes. The influence of body mass, condition and size on the reproduction of mature Karakul ewes was investigated during the seasonal anestrum and breeding periods. Variation in body mass…
Six male and 24 female Cherry Valley Pekin ducklings were randomly allocated to each of 12 pens to test the effects of quantitative feed restriction during the rearing period on the subsequent reproductive performance. The three treatments were 50% of…
The effect of supplementation on the milk production of Boer goat ewes maintained under veld conditions (grass-/bush community) was studied over a 12-week lactation period. An average of 625 g concentrates was consumed per ewe per day. Supplemented ewes produced…
The potential of chemically treated common reed (Phragmites australis) hay in maintenance diets for sheep. 1. The effect of NaOH treatment and ensilage with urea on intake, digestibility and rumen kinetics. Untreated, NaOH treated and urea ensiled common reed…
The potential of chemically treated common reed (Phragmites australis) hay in maintenance diets for sheep. 2. A comparison between NaOH treatment and ammoniation with or without molasses with respect to digestibility, intake and nitrogen retention. A digestibility experiment was conducted…
The use of mealie hay as roughage source in lamb finishing diets. The influence of supplementation of mature maize plants (6% crude protein; 11,4 MJ DE/kg) with both energy and nitrogen on production aspects of slaughter lambs was investigated. A…
The utilization of urea-supplemented and ammoniated barley straw in sheep. Barley straw treated with urea (75 kg/ton straw) and with anhydrous ammonia (30 kg/ton straw) by the stack and oven methods were compared with urea-supplemented barley straw in an intake…
The influence of energy and nitrogen supplementation of mature maize plants on wool growth of Dohne merino lambs. The influence of supplementation of mature maize plants (6% crude protein; 11,4 MJ DE/kg) with both energy and nitrogen on wool production…
Influence of microwave and heat treatment in a household oven on the nutritive value of full-fat soy beans as determined by an urease index, the FDNB test for available lysine and a broiler growth test. The microwave treatment of soy-bean…
Fractionation of sunflower oilcake meal and use of the low-fibre fraction together with full-fat soy-bean meal as a replacement for fish-meal in broiler diets. Nutrient concentrations of various fractions of sunflower oilcake meal were studied by sieving the meal through…
Effect of dietary energy concentration on the performance of broilers. The effect of varying ME content between 11,5 and 14,2 MJ/kg feed was studied with broilers in an 8-week trial. Ten treatments were used with dietary ME levels of 11,5;…
A linear discriminant function (LDF) was used to estimate the level of milk progesterone which allowed the best overall classification of dairy cows into pregnant and non-pregnant groups (confirmed by rectal palpation). Progesterone levels were measured in milk samples drawn…
Two of the many factors which may affect the accuracy of pregnancy diagnosis using milk progesterone levels are day of sampling and number of samples taken per cow. These two aspects were analysed using information obtained from progesterone profiles encompassing…
