Effect of individual and mixed live yeast culture feeding on growth performance, nutrient utilization and microbial crude protein synthesis in lambs

• Published in: Animal feed science and technology Vol. 155; no. 2; pp. 163 - 171
• Main Authors: Tripathi, M.K., Karim, S.A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 10.02.2010; [New York, NY]: Elsevier Science; Elsevier
• Subjects: Animal productions; Biological and medical sciences; crude protein; feed additives; Feed and pet food industries; feed intake; finishing; Food industries; Fundamental and applied biological sciences. Psychology; Growth; Intake; Kluyveromyces; Kluyveromyces marxianus; lamb feeding; Lamb performance; lambs; liveweight gain; mixtures; nitrogen balance; nutrient utilization; nutritive value; optimal nutrition; Probiotic; probiotics; protein synthesis; rumen fermentation; rumen microorganisms; Saccharomyces cerevisiae; Saccharomyces uvarum; Terrestrial animal productions; Vertebrates; weanlings; Yeast culture; yeasts; Probiotic; ADF; MP; ADG; Growth; DOMI; DM; CP; Yeast culture; NDF; BW; ME; TMR; Intake; Lamb performance; OM; Farming animal; Yeast; Lamb; Feeding; Vertebrata; Meat animals; Mammalia; Protein synthesis; Individual; Sheep; Nutrient; Artiodactyla; Performance; Crude protein; Ungulata
• ISSN: 0377-8401; 1873-2216
• DOI: 10.1016/j.anifeedsci.2009.11.007

This study investigated effects of feeding three individual, and a mixed, yeast culture ( Kluyveromyces marximanus NRRL3234, Saccharomyces cerevisiae NCDC42, Saccharomyces uvarum ATCC9080 all in a 1:1:1, ratio) on growth performance, nutrient utilization and microbial crude protein (CP) synthesis in feedlot lambs during the post-weaning phase of growth. Sixty weaner lambs (90 ± 3.5 d old and 15.9 ± 0.50 kg BW) were fed for 91 d in five equal groups. The control group of lambs received sterilized culture medium while the treatment groups were fed a yeast culture in addition to a ad libitum total mixed ration (TMR). The yeast culture, dosed at 1 ml/kg body weight (BW) had 1.5–2.0 × 10 9 live cells/ml. Yeast culture supplementation did not influence intake and digestibility of organic matter (OM), CP, neutral detergent fiber (NDF), acid detergent fiber (ADF) and hemicellulose and the metabolizable energy (ME) level of the diets were similar between control and yeast supplemented lambs. Lambs in all groups were in positive N balance, but N intake and N voided in feces and urine, as well as N balance, did not change due to yeast culture supplementation. Urinary allantoin excretion was similar, but purine derivatives absorbed (mM/d) were higher ( P<0.05) in yeast culture supplemented lambs. Yeast culture supplementation improved ( P<0.05) microbial CP synthesis. Supplementation of SC and mixed yeast improved ( P=0.002) BW gain of lambs by 21% and 16% respectively. All yeast culture supplemented lambs had higher feed efficiency in comparison to control lambs. Among the three yeast cultures used, S. cerevisiae had the most potential as a growth promoting feed additive in feedlot lamb production, and it may serve as an alternate to antibiotics and ionophores as a growth promoter of weaner lambs.