Now showing items 1-10 of 36
The evaluation of the growth parameters of six South African commercial crossbred pig genotypes.
Simulation modeling is an active part of animal nutrition. These complex programs rely on mathematical functions to predict the performance of an animal. The Gompertz equation is a simple, but accurate function that fits ...
The effect of dietary protein and energy on feed intake and performance of laying hens.
This study was designed to devise a method by which the optimum combination of dietary energy and protein could be found that maximises the margin over feeding cost in an egg production enterprise. It was necessary to ...
Factors influencing the rates of lipid deposition and withdrawal in growing pigs.
This study was conducted to determine the influence of factors on the efficiency of protein utilization and the rate of lipid deposition and withdrawal in growing pigs. Two experiments were conducted in total. The first ...
The effect of photoperiod after photostimulation on male broiler breeder fertility.
Fertility in male broiler breeders may be controlled through a number of different methods, including lighting programmes. Currently in the poultry industry, male and female broiler breeders are reared under the same ...
Influence of composition and storage conditions on diet quality and productivity of broiler chickens.
Two experiments were conducted to assess the effects of varying storage temperature and relative humidity (RH) on feed quality and nutritive value of such diets when fed to broiler chickens. The diets used in experiment ...
Introducing stochasticity into a model of food intake and growth of broilers.
Predicting the weights of the physical parts of broilers.
Breeding companies advertise their chickens as having been selected for heavier breast meat. However, when comparisons are made between strains, these are normally made at a common age, and under these conditions the ...
Evaluating a selection index for improving body weight and egg production in a simulated population of broilers.
The most successful method used for improving the growth rate of broilers is genetic selection. Improvements in nutrition, housing and disease resistance have been impressive, yet genetic selection is purported to have ...
Evaluating the efficacy of exogenous composite microbial enzymes in maize-soybean based broiler chicken feeds.
This research reported here was carried out to examine alternatives to antibiotic growth promoters as a result of their being banned in the animal feed industry. Four experiments were conducted to evaluate the efficacy ...
The effect of dietary crude protein, organic selenium and vitamin E on fertility and semen quality of broiler breeder males.
There are negative influences of selection for broiler growth on the reproductive ability of broiler breeder parents. This is mostly due to problems related to excessive body weight, such as an inability to achieve successful ...