Growth promotants in feeding pigs and poultry. I. Growth and feed efficiency responses to antibiotic growth promotants

Role of Growth Promotants in Poultry and Swine Feed

Feed producers are faced with choosing from a myriad of growth promoting substances all claimed to improve performance and have some advantage over competitive products. In most cases, these products are "nonnutritional" and contain nothing that contributes directly toward meeting the animals requirement for nutrients. Yet, many have been confirmed to be highly cost-effective when added to feed...

Animal Growth Promotants

HISTORICAL DEVELOPMENT In the early 1930s, it was reported that injections of crude pituitary extracts increased growth rates in growing animals and milk production in lactating animals. Subsequent studies led to purification from pituitary extracts of two peptide hormones—prolactin and “growth hormone” or somatotropin—which are important to growth and lactation. Prolactin has many functions ra...

Antibiotics as growth promotants: mode of action.

Recent concerns about the use of growth-promoting antibiotics in pig diets have renewed interest in the immunologic and growth-regulating functions of the gastrointestinal (GI) tract. The numerically dense and metabolically active microbiota ofthe pig GI tract represents a key focal point for such questions. The intestinal microbiota is viewed typically as a beneficial entity for the host. Inte...

The influence of hormonal growth promotants on marbling

Table 1. Implant Products currently available in Australia. Abstract. The paper lists 15 different commercial products containing hormonal growth promotants (HGPs). HGPs contain synthetic forms of the steroids oestrogens, androgens or progestins. Results from the USA confirm that there are small but variable reductions in marbling associated with HGP treatment of grainfinished cattle. Experimen...

The Effect of Growth Promotants in Young Growing Horses