Nutritive Properties of Torula Yeast for Poultry

Ringrose, R. C.

doi:10.3382/ps.0280075

Cited by 11 publications

(5 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The TY used here had a DM content similar to that of several previous reports (93.70% to 95.63%; Ringrose, 1949 ; Olvera-Novoa et al, 2002 ; Øverland et al, 2013 ; Lagos and Stein, 2020 ). Figueroa et al (1990) and Ringrose (1949) reported similar ash (8.4% and 8.0%, respectively) but lower CP values (44.9% and 48.5%, respectively), whereas Olvera-Novoa et al (2002) reported greater ash (10.2%) and lower CP (46.11%). Øverland et al (2013) reported lower ash (5.4%), similar CP (56.0%), and greater GE (5110 kcal*kg −1 ) concentrations.…”

Section: Discussionsupporting

confidence: 77%

“…On a DM basis, CP (54.16%), GE (4810 kcal*kg −1 ), and TDF (21.5%) reported by Lagos and Stein (2020) were relatively similar to that observed here; however, those authors reported greater ash content (13.16%). Interestingly, fat content of the TY used in the current work was higher than all other reports (0.9% to 3.37%; Ringrose, 1949 ; Olvera-Novoa et al, 2002 ; Øverland et al, 2013 ; Lagos and Stein, 2020 ), and almost double the next leading amount (3.37% DM basis; Lagos and Stein, 2020 ). Differences in the nutrient composition of TYs are not surprising, as they have been grown under a wide range of conditions ( Buerth et al, 2016 ) and cultivated on a variety of different substrates including beet pulp ( Athar et al, 2009 ), distillery waste ( García et al, 2014 ; Hosken et al, 2015 ), pineapple effluent ( Nigam, 1998 ), and wheat bran ( Yunus et al, 2015 ) among others; whereas, the particular yeast used in the present experiment was grown on forestry byproducts from the timber industry.…”

Section: Discussioncontrasting

confidence: 71%

See 1 more Smart Citation

Evaluation of Torula yeast as a protein source in extruded feline diets

Holt

Aldrich

2022

Journal of Animal Science

View full text Add to dashboard Cite

The objective of this work was to evaluate the use of a Torula yeast on diet processing, palatability, and total tract nutrient digestibility in extruded feline diets. Four dietary treatments were compared, differing by protein source: Torula yeast (TY), pea protein concentrate (PP), soybean meal (SM), and chicken meal (CM). Diets were produced using a single-screw extruder under similar processing conditions. Palatability assessment was conducted as a split plate design where both first choice and intake ratio (IR) were determined. Apparent total tract digestibility (ATTD) of nutrients was estimated using Titanium dioxide as an indigestible marker. During diet production, specific mechanical energy (SME) of TY and SM (average of 187 kJ/kg) was greater (P<0.05) than for PP (138 kJ/kg); however, CM was similar to all treatments (167 kJ/kg). Kibble diameter, piece volume, and sectional expansion ratio were greatest for TY (P<0.05). Additionally, both bulk and piece density were lowest (P<0.05) for TY. Kibble hardness was lower for TY and SM (P<0.05; average of 2.10 Newtons) compared to CM and PP (average of 2.90 Newtons). During the palatability trial, TY was chosen first a greater number of times than CM (P<0.05; 36 vs 4, respectively), but differences were not found between TY and PP (25 vs 15, respectively) or TY and SM (24 vs 16, respectively). Cats had a greater IR (P<0.05) of TY compared to CM and PP (0.88 and 0.73, respectively). However, there was no difference in preference between TY and SM. ATTD of dry matter (DM) and organic matter (OM) was greater (P<0.05) for CM (87.43 and 91.34%, respectively) than other treatments. Both DM and OM ATTD of TY were similar (P<0.05) to PP and SM (average of 86.20 and average of 89.76%, respectively). Ash ATTD was greater (P<0.05) for cats fed TY and SM (average of 37.42%), intermediate for PP (32.79%), and lowest for CM (23.97%). Crude protein (CP) ATTD of TY was similar to all other treatments (average of 89.97%), but fat ATTD was lower (P<0.05; 92.52%) than other treatments (93.76 to 94.82%). Gross energy (GE) ATTD was greater (P<0.05) for CM than TY (90.97 vs 90.18%, respectively); however, TY was similar to PP and SM (average of 90.22%). Total dietary fiber (TDF) ATTD was similar between TY and CM (average of 66.20%) and greater (P<0.05) than PP and SM (average of 58.70%). The Torula yeast used in this study facilitated diet formation, increased diet preference, and was highly digestible when fed to cats.

show abstract

Section: Discussionsupporting

confidence: 77%

Section: Discussioncontrasting

confidence: 71%

Evaluation of Torula yeast as a protein source in extruded feline diets

Holt

Aldrich

2022

Journal of Animal Science

View full text Add to dashboard Cite

show abstract

“…gracilis. Dried yeast has long been recognized as an outstanding source of the B vitamins, but as the main source of protein it has generally proved inadequate (7,70,77,74,77,78,22,25). The inadequacies of yeast proteins, like those of other food proteins, may be largely corrected when yeast is used in combination with other foods.…”

mentioning

confidence: 99%

Yeasts, Methionine and Cystine Contents

Ghiao¹,

Pbterson²

1953

J. Agric. Food Chem.

View full text Add to dashboard Cite

In view of the world shortage of dietary protein, and the fact that yeast protein can be used to replace half of other proteins in the diet of chicks and rats, the possibility of improving the nutritional value of yeast by raising its protein and methionine content was investigated. Baker's and brewer's yeasts are known to be deficient in methionine and cystine, although literature data on percentages present vary greatly. The methionine content of seven commercial yeasts was found to vary from 0.48 to 0.75% on a dry basis. A fat yeast, Rhodototula gracilis, contained 1.00% of methionine, which is about 20% higher than the commercial Saccharomyces species and nearly double that of the Torula type (0.54%). The protein content and methionine value of yeast were guilliermondii, C. zeylanoides, Debaryomyces

show abstract

“…An analysis of the torula yeast produced at the Lake States plant is shown in Table III. ' Campbell and Ringrose (2,7) have made extensive feeding tests on poultry using the torula jreast. It was their conclusion that the yeast could be used as a source of protein for growing chicks and laying pullets and that it was a good source of riboflavin and pantothenic acid.…”

Section: Nutritive Value Of Torula Yeastmentioning

confidence: 99%