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For Brahman or Santa Gertrudis crosses (tropical breeds), a medium to high roughage diet may be adequate. For animals raised on the range from weaning to 18 months, a daily live weight gain of 0.3 kg has been reported (Animal production and range research unit 1988) and this will probably decline as the animals mature.
Under normal practical conditions, a broiler must gain an average of 65 grams or more per day. The average daily weight gain is not uniform for each week and varies considerably depending on age and sex. Table 3 demonstrates the daily gains from 1 to 49 days on a weekly interval basis for straight run broilers.Table 2.here is no doubt that a direct relation exists between egg size and chick weight/quality. The larger the fertile egg, the larger the initial chick weight. The rule of thumb is that 68-72% of a small egg must be converted to chick, whereas 65-68% of a medium or large egg must be converted to chick.