an experiment was conducted to evaluate the effect of early feed restriction on performance and serum thyroxin concentration of broiler chicks. the experiment was designed in a 2×2 factorial with 5 replicates of floor pens with 12 male or female chicks in each. 240 male and/or female day-old chicks of a commercial strain (hybrow) were wing banded, weighed and randomly allocated to two treatment...

The cost of feed is the most important cost in pig meat production (about 60%), and the energy component represents the greatest proportion. Therefore, it is important to estimate precisely the energy value of feeds, either for least-cost formulation purposes or for adapting feed supply to energy requirements of animals. Evaluation of energy content of pig feeds is usually based on their digest...

The length of time to keep cattle on feed that maximizes profits is determined by the point when incremental costs equal incremental increases in animal value. The primary cost in a cattle feeding enterprise is ration expense, so in order to effectively project optimal marketing time it is necessary to be able to determine future feed conversion. It is widely considered that feed conversion is ...