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Studies of the addition of viable yeast cell suspensions to beef cattle rationsBowman, Ollie Monroe. January 1955 (has links)
Call number: LD2668 .T4 1955 B68 / Master of Science
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Evaluation of turkey (Meleagris gallopavo) breeder hen and market male performances when fed diets supplemented with a yeast culture containing Saccharomyces cerevisiaeBradley, Gary L. 08 March 1994 (has links)
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
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Reproductive performance of Wrolstad Medium White turkey hens fed a breeder diet containing a yeast cultureHayat, Javed 26 August 1992 (has links)
An experiment was conducted to evaluate a breeder diet
containing a yeast culture as a means of improving the
reproductive performance of two genetically dissimilar lines
of turkey hens (designated as L and H). Two hundred hens of
lines L and H, 100 hens per line, were housed in a curtain
sided breeder house (10 hens/line/pen). Starting at 31 weeks
of age (WOA), the hens were fed either Corn-soy (CS) or Corn
soy+yeast (CS+Y,.5% Diamond V Mills "XP" yeast culture,
Saccharomyces cerevisiae) diets. Between 33 and 45 WOA, the
hens were mated inter se and from 45 to 51 WOA reciprocal line
matings were established. Hen reproductive parameters measured
between 31 and 51 WOA were, body weight (BW) change, feed
intake, feed per dozen eggs, egg production, egg size,
fertility, embryonic mortality, and hatchability of fertilized
eggs from 7 biweekly egg settings.
No differences (P>.05) were observed with yeast culture
supplementation of the diet for changes in BW, egg production,
egg weight, embryonic mortality, and hatchability of
fertilized eggs (n= 5 biweekly hatches) of either line. A
significant time by diet interaction was evident only in feed
intake. There was an improved (P<.05) hen fertility in line H
as a result of feeding the dietary yeast culture.
When reciprocal line crosses were established between 46
and 51 WOA, hatch of fertilized eggs (n= 2 biweekly hatches)
was substantially improved (p<.05) from hens fed the yeast
culture containing diet. The results of this study suggest
that there is a genetic factor associated with the feeding of
a diet containing a yeast culture to turkey breeder hens. / Graduation date: 1993
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The effects of supplemental anionic salts & yeast culture on the production of dairy cattle during the periparturient periodBluel, Reagan J. Vogel, January 2006 (has links)
Thesis (M.S.) University of Missouri-Columbia, 2006. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 21, 2007) Vita. Includes bibliographical references.
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The effect of yeast cell wall preparations on salmonella colonisation, gastrointestinal health and performance of broiler chickensBrümmer, Mieke. January 2007 (has links)
Thesis (M.Sc.(Agric.))--University of Pretoria, 2007. / Includes summary. Includes bibliographic references (leaves 75-86).
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Effects of live yeast, monensin and concentrate level in dairy cattle diets on gas and volatile fatty acids productionMokatse, Brenda 14 September 2015 (has links)
Two meta-analysis of effects of yeast culture and monensin in lactating dairy cows were first performed. Secondly, two experiments were performed to evaluate the effects of live yeast (LY) or monensin (M) or both (LY+M) on gas production and fermentation by rumen micro-organisms in vitro in low (40 %) and high (60 %) concentrate diets of dairy cows. Rumen contents were collected from one cannulated lactating Holstein cow. Gas production was measured from 0 to 48 h of incubation. Volatile fatty acids and ammonia nitrogen concentrations were measured after 48 h. Meta-analysis of monensin indicated decrease dry matter intake (DMI) and increasing milk yield, consequently improving feed efficiency. Meta-analysis of yeast culture did not show improved performance. These results highlighted the importance of the meta-analysis as a useful tool that can be employed to both summarize effects across studies and to investigate factors explaining potential heterogeneity of response. The batch fermentation showed that in high concentrate diet, M significantly increased ammonia nitrogen, decreased acetate, but tended to increase propionate concentration (7.9, 63.2, 18.6 vs. 6.3, 66.8, 14.2 mmol/l; respectively). Addition of LY increased acetate concentration (64.2 vs 66.8 mmol/l). Supplementation with M, LY and LY+M reduced total gas production by 37.1, 22.5 and 26.9 %, respectively, compared to control at 48 h. In low concentrate diet, M and LY+M decreased and increased acetate (60.1 and 69.7 vs. 7.1 mmol/l; respectively). Adding LY and LY+M produced 8.6 % less gas, and M treatment 3.4 % more gas than the control. Overall, at 48 h, high concentrate resulted in less gas than low concentrate diets. High concentrate diets showed increased ammonia (7.9 and 6.4 vs. 5.21 and 4.7 mmol/l) decreased acetate (63.0 and 63.2 vs. 67.0 and 69.7 mmol/l) with a tendency to increased propionate (18.6 and 18.9 vs. 14.6 and 14.1 mmol/l) compared to low concentrate in M and LY+M treated diets. These results indicate that the effects of M and LY on rumen fermentation are substrate dependent, the high-concentrate diet showing the greatest response / Agriculture / M. Sc. (Agriculture)
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Effects of live yeast, monensin and concentrate level in dairy cattle diets on gas and volatile fatty acids productionMokatse, Brenda 14 September 2015 (has links)
Two meta-analysis of effects of yeast culture and monensin in lactating dairy cows were first performed. Secondly, two experiments were performed to evaluate the effects of live yeast (LY) or monensin (M) or both (LY+M) on gas production and fermentation by rumen micro-organisms in vitro in low (40 %) and high (60 %) concentrate diets of dairy cows. Rumen contents were collected from one cannulated lactating Holstein cow. Gas production was measured from 0 to 48 h of incubation. Volatile fatty acids and ammonia nitrogen concentrations were measured after 48 h. Meta-analysis of monensin indicated decrease dry matter intake (DMI) and increasing milk yield, consequently improving feed efficiency. Meta-analysis of yeast culture did not show improved performance. These results highlighted the importance of the meta-analysis as a useful tool that can be employed to both summarize effects across studies and to investigate factors explaining potential heterogeneity of response. The batch fermentation showed that in high concentrate diet, M significantly increased ammonia nitrogen, decreased acetate, but tended to increase propionate concentration (7.9, 63.2, 18.6 vs. 6.3, 66.8, 14.2 mmol/l; respectively). Addition of LY increased acetate concentration (64.2 vs 66.8 mmol/l). Supplementation with M, LY and LY+M reduced total gas production by 37.1, 22.5 and 26.9 %, respectively, compared to control at 48 h. In low concentrate diet, M and LY+M decreased and increased acetate (60.1 and 69.7 vs. 7.1 mmol/l; respectively). Adding LY and LY+M produced 8.6 % less gas, and M treatment 3.4 % more gas than the control. Overall, at 48 h, high concentrate resulted in less gas than low concentrate diets. High concentrate diets showed increased ammonia (7.9 and 6.4 vs. 5.21 and 4.7 mmol/l) decreased acetate (63.0 and 63.2 vs. 67.0 and 69.7 mmol/l) with a tendency to increased propionate (18.6 and 18.9 vs. 14.6 and 14.1 mmol/l) compared to low concentrate in M and LY+M treated diets. These results indicate that the effects of M and LY on rumen fermentation are substrate dependent, the high-concentrate diet showing the greatest response / Agriculture / M. Sc. (Agriculture)
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