No CrossRef data available.
Published online by Cambridge University Press: 27 February 2018
There are many agents which can assist in ensuring neonatal survival and growth. The most important is still colostrum and although there are many substitutes available, the best of which will be prepared from colostrum of the same species (cattle, sheep and goats), or where this is impracticable, from plasma or serum (horses, pigs). Other agents which can enhance viability include antibiotics, probiotics, vitamins, minerals, the lactoperoxidase system, lactoferrin, lysozyme, hyperimmune sera, vaccines, acidifiers, enzymes and oligosaccharides. Many probiotic products are available containing different organisms which may be live or dead. Probiotics have been available for many years as nutritional supplements. However, results obtained with them have been variable and often of dubious validity. There is at present a trend to suggest such products have therapeutic or prophylactic activity. Thus it would appear that they are developing along the reverse route to that of antibiotics which initially were used for therapy or prevention, only later to be used as food additives and growth promoters. It is likely that any successful probiotic will need to meet criteria laid down by proponents of their use in human beings 50 years ago. These include that they contain live organisms capable of multiplication in the alimentary tract and of a strain indigenous to the species. A large number of organisms will be required daily and the diet of the animal will need to be defined. It would appear that treatment should commence as soon as possible after birth.
As therapeutic claims are often directly or indirectly implied it would seem justified that probiotics should be registered and criteria for their evaluation discussed. Results of recent trials with oral colostrum substitute and injection of hyperimmune serum are used to illustrate the type of trials likely to be required for probiotics.
Other methods of enhancing survival are discussed.