Studies investigating the effects of feeding diets
containing the yeast, Saccharomyces cerevisiae var.
boulardii (SCB), and a yeast culture (YC) containing S.
cerevisiae were conducted in market turkeys and Medium White
turkey breeder hens.
Increased utilization of dietary gross energy, N, Ca,
P, B, K, Mg, and Mn were observed in poults fed a diet
containing 1% YC when compared to the control and 1%
inactivated YC diets at 4 weeks of age (WOA). It was
concluded that the YC must be "biologically active" in order
to affect nutrient retention in poults.
Feeding day-old poults diets containing varying amounts
of SCB resulted in increased body weights at 3 WOA. Greater
body weights and a decrease in the number of mucous-secreting
goblet cells per mm of villus height and a decreased
crypt depth were observed in poults receiving .02% SCB from
3 to 5 WOA. No dietary differences were observed for either
villus height or width. Results indicated that feeding SCB
to poults increased body weight and altered gut morphology.
Experiments conducted to evaluate the effects of .25%
YC on market male turkey performance resulted in contradictory responses. Supplemental YC increased body weights of turkeys at 5, 8, 11, and 14 WOA in one trial, while no
differences and depressed body weights from 2 through 17 WOA
were observed in two subsequent trials, respectively.
Similarly, feed to gain ratios were improved from day-old to
5 WOA in one trial, while no differences and a higher feed
to gain ratio was observed from 2 to 5 WOA in the second and
third trials, respectively. Results indicated that
unelucidated factors may influence the response of market
male turkeys fed dietary YC.
Consistent results have been observed in two trials on
the hatchability of fertile eggs (HFE) from hens of three
genetic lines fed .5% dietary YC. Early embryonic mortality
(0-10 d of incubation) was reduced when hens were
supplemented with YC and the HFE was increased in eggs
stored less than 9 days in select hen genotypes. Results
indicated that the breeder hen's genotype and pre-incubation
storage time are factors to be considered when evaluating a
YC in turkey breeder hen diets. / Graduation date: 1994
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/35453 |
| Date | 08 March 1994 |
| Creators | Bradley, Gary L. |
| Contributors | Savage, Thomas F. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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