Comparison of the Nutritive Value of Yeasts Grown on Hydrocarbon Feedstocks under Varying Processing Conditions

Evaluation of methanol‐grown bacteria and hydrocarbon‐grown yeast as sources of protein for poultry: Studies with young chicks

“…D' Mello (19733) and D' Mello and Acamovic (1976), respectively, reported satisfactory nitrogen retention in chicks receiving dietary methane-oxidising bacteria and PR. In contrast, Waldroup and Flynn (1975) pointed out that the reduction in food intake does not explain the reduced NER and NPU values observed with yeast diets. The difference between the NPU values for yeast and for a soyabean-fishmeal mixture was attributed by Hewitt and Labib (1978) to the high nucleic acid content of the former.…”

“…The method of drying (D' Mello and Acamovic, 1976), the degree of grinding (Van Weerden et al, 1976) as well as other manufacturing techniques and processing conditions, may also have a pronounced effect on the acceptance of SCP-containing diets by birds (Waldroup and Flynn, 1975;Sambeth and Sittig, 1978) because of powdery consistency, dustiness, adhesive properties (when moistened) or bulkiness. The yeast product used here (LA) is indeed very powdery, and its acceptability by young chicks would be enhanced if offered in granular or pelleted form.…”

“…This has been referred to by Waldroup and Flynn (1975), Shannon et al (1976), White and Balloun (1977) and Hewitt and Labib (1978). Most of the initial work on the production of SGP from petroleum-derived materials centred on yeasts and gas oil or normal paraffins as substrates.…”

Amino Acid Limitations of Yeast Single-Cell Protein for Growing Chickens

“…Waldroup and Flynn (1975) observed that even with DLmethionine supplementation, YSCP fed as the sole source of protein to chicks gave widely varying net protein utilization and nitrogen efficiency ratio values, all of which were significantly lower than for soy protein.…”

“…Several studies have been carried out to determine the nutritive value of yeast protein for poultry (Shannon and McNab, 1972;Waldroup and Flynn, 1975;Whittemore et al, 1978;Hewitt and Labib, 1978). Most of these studies have utilized yeast protein as a replacement for soybean meal or other protein supplements in 'Journal Paper No.…”