Records on body mass and reproductive performance of 920 Sussex type cows, ranging in age from yearlings to adults (5 years and older) were examined for relationships between body mass (X) and conception (Y). The data was obtained over a…
One hundred and twenty 4-month·old, single-combed, brown Hy-Line pullets were fed two isocaloric diets containing 16 or 13,5% protein with and without 5% clinoptilolite in four treatments with thirty hens per replicate. Sterile river sand was used as a filler…
Six male and 24 female Pekin ducks per pen were randomly allocated to 12 pens to test the effects of quantitative feed restriction during the rearing period on subsequent reproductive performance. The feed treatments during the rearing periods were ad…
An experiment was conducted to determine the feeding value of sweet white lupins (Lupinus albus variety Buttercup) for broilers up to 8 weeks of age. Two isocaloric and isonitrogenous starter (0 - 4 weeks) and finisher (4 - 8 weeks)…
Ovarian activity was studied in 36 dry, Bos taurus cows fed to achieve different rates of body mass loss and gain in a 2 x 2 factorial experiment. Cows were fed hay to supply either 70% (Treatments 1, 2) or…
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 effects of energy and crude protein (CP) supplementation to lactating ewes on the performance of the ewes and their lambs, while grazing native pasture (veld), were studied during two autumn (1981 and 1982) and two spring (1983 and 1984)…
Data consisting of 445 calving records from Bonsmara breeding females were studied in order to establish relationships between body mass and conception. Significant relationships between body mass at the start of the mating period and percentage conception were established by…
The effect of early mating on the production and reproductive ability of Nguni heifers was investigated. One group (MN group) of heifers (n = 15) was stall-fed from weaning and mated at approximately 13 months of age. The second group…
Factors influencing the recalving rate of 2 165 lactating beef cows of four pure breeds (Afrikaner, Hereford, Bonsmara and Simmentaler) and three cross-bred types were investigated on the Mara Research Station between 1972 and 1982. Average recalving rate was 88.3%.…
