Using biotechnology to increase the growth rates of fish is likely to reduce production costs per unit of food. Among vertebrates, fish appear to occupy a unique position, when growth patterns are considered. With few exceptions, fish species tend to grow indeterminately, implying that size is never fixed. Both hyperplasia and hypertrophy contribute to post-larval muscle growth in fish. Growth hormone (GH) – Insulin-like Growth Factor I (IGF-I) is the most important growth axis in fish. Our experimental model, the […]

The objective of the experiment was to study the effect of pretreatment with 500 mg of sometribove (rbST) on superovulatory response, on number and embryos quality of twenty six crossbred holstein-zebu heifers, allocated into two treatments: T1 ¾ treated with rbST (n=13) and T2 – control (n=13). Thirteen superovulations were done between september and december of 1997 (period 1), and thirteen superovulations between the end of december 1997 and february of 1998 (period 2). For each period seven animals were […]

The objective of this work was to evaluate the effect of the administration of 20 mg of slow liberation bovine somatotropin (rBST) on the dry matter intake and on the digestibility coefficient of dry matter (MS), acid detergent fiber, crude protein, crude energy, nitrogen balance and the daily weight gain in lambs fed diets based on corn silage, sugar cane or hydrolyzed bagasse and concentrate. Twenty-four crossbred lambs, averaging 4-5 months of age and 22 + 2 kg LW, were […]