Now showing items 1-10 of 115
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 ...
The effects of dietary lysine, crude protein, energy and feed allocation on broiler breeder hen performance.
This study was conducted to investigate the effects of varying levels of dietary lysine and feed allocation, on the performance of female broiler breeders. In trial 1, 900 Cobb breeders from 26 to 45 weeks of age were ...
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 ...
The response of broiler breeder hens to dietary lysine : hatchability, embryo growth and subsequent offspring performance.
This study was conducted to determine the effects of breeder hen dietary lysine on offspring performance. In trial 1, Cobb 500 broiler breeder hens were fed 1200, 1070, 930 and 800 mg lysine/bird/d from 26 to 60 weeks of ...
Introducing stochasticity into a model of food intake and growth of broilers.
The use of enzyme supplementation for wheat-barley diets in poultry as a means of improving productive performance.
The objective of the study was to evaluate the effect of an exogenous multi-blend enzyme ( -glucanase and xylanase) on the performance of the broiler chickens and laying hens fed diets based on wheat and barley. Experiments ...
The effects of maternal dietary lysine intake on broiler breeder offspring performance.
The aim of this study was to evaluate the effects of broiler maternal dietary lysine intake on progeny performance. Three experiments were conducted with chicks hatched from Cobb 500 breeders at 38, 48, and 60 weeks of ...
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 ...