The effect of age of dam on adjusted 210 day calf weaning mass was estimated by the Least Squares method for 5 dam types on 2 farms. In the 12 models used the age of dam significantly (P < 0,01)…
Synchronisation of oestrus in the S.A. Mutton Merino: the influence on conception and fecundity: During the breeding season 183 South African Mutton Merino ewes were used to study the effect of MAP + PMSG on conception and fecundity. With an…
The blood plasma progesterone concentration during 3 different breeding seasons, was studied in 15 South African Mutton Merino ewes. The ewes were bled daily starting at the onset of oestrus until 6 days after the following oestrus period. Plasma progesterone…
Oestrus, ovulation and peripheral plasma progesterone concentrations were recorded in 58 lactating South African Mutton Merino ewes treated variously with progestagen, pregnant mare serum gonadotrophin (PMSG), prostaglandin and gonodotrophin releasing hormone (GnRH) at 2 post partum intervals (22 or 35…
The effect of age at weaning on the productivity of the sow: The effect of age at weaning applied for the first 5 lactation periods of the sow, on productivity measured in terms of litter size and the annual number…
Four Afrikaner , 3 Afrikaner x Friesian, 4 Bonsmara, 5 Charolais and 4 Hereford bulls within the mass range 101 – 772 kg were used to evaluate the tritium and urea dilution techniques for accurate prediction of body composition. Approximately…
Linear regression equations with tritium or urea space, live mass and carcass mass (where applicable) as independent variables, and the chemical components of the carcasses of bull were established. Similar equations were calculated for the chemical components of the non-carcass…
Linear regression equations with tritium or urea space and live mass as independent variables and muscle, bone and dissectable fat in bull carcasses were calculated. The accuracy of these equations was compared to othe15 similar to these, but where the…
Maize meal supplementation to young steers on summer veld and different planes of nutrition during winter: The influence of 2 planes of nutrition during winter as well as maize supplementation at different stages of growth of summer veld. On the…
In the course of studies designed for evaluation of locally produce forages, significant differences (P ≤0,05) in voluntary intakes of lucerne hay and oat hay by sheep, were found. These differences could be partly explained by differences observed in protein…
The influence of supplementary protein and phosphorus to Dorper and Merino wethers on native pasture was investigated over a period of one year. The supplements were provided by 2 different methods namely as a lick or at a constant daily…
Voluntary feed intake, digestibility and rumen flow- and fermentation dynamics were studies using sheep. NaOH treated (5 % w/w) wheat straw, washed and. unwashed as well as untreated straw were compared. Results indicated that washing the straw had little effect…
A first order model for predicting voluntary intake was applied to sheep fed roughages differing in quality. Important variables identified in this study were the rumen capacity of the animals, the first order rate constant for fermentation of the diet,…
A trial was carried out at the Vaalharts Agricultural Research Station in which Dorper ewes were run on either Cenchrus ciliaris or Panicum maximum pastures or fed lucerne hay. Three lamb crops were obtained over a 2-year period. Lambs were…
An estimate of the total energy intake of litters until weaning, including both energy obtained in-utero and that derived post-natally from milk consumed, is often required in experiments on growth efficiency. Frequently it is, however, impossible to measure this energy directly…
Keywords: Post partum reconception. Angora
Keywords: Textile fibres, production strategy
