Influence of amino acid supplements to a straw-maize-based urea diet on duodenal digesta flow and digestion in sheep

Fujimaki, Takahiro; Kobayashi, Y.; Wakita, Masaaki; Hoshino, S.

doi:10.5713/ajas.1994.137

Cited by 2 publications

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“…The availability of microbial protein and VFA for absorption is dependent on the availability of the monomers required for microbial cell synthesis in the rumen. Regardless of diet, it has been reported that peptides and amino acids added to the rumen appear to give no benefit of OM digested in the rumen over urea (Redman et al, 1980;Cruz Soto et al, 1994;Fujimaki et al, 1994). A decrease in OM digested in the rumen with increasing FSBM reported in this study was partly due to an increase in contents of RUP in diets.…”

Section: Discussionmentioning

confidence: 45%

“…On the other hand, a supply of a small amount of peptides and amino acids in addition to ammonia to a sugar or starch but not cellulose diet in vitro studies resulted in a substantial increase in net bacterial protein synthesis (Maeng and Baldwin, 1976). A lack of response in the majority of in vivo studies (Redman et al, 1980;Cruz Soto et al, 1994;Fujimaki et al, 1994) can be due primarily to a large diversity of rumen microbes and their interactions. In this study, a decrease in net microbial protein synthesis in the rumen (as indicated by purine derivatives in urine) with increasing contents of RUP from FSBM was associated with increasing numbers of protozoa in ruminal fluid.…”

Section: Discussionmentioning

confidence: 99%

“…Microbial protein can be mostly synthesized from the nitrogen of RDP, passing through the ammonia pool in the rumen (Nolan, 1993). A number of in vivo studies (Redman et al, 1980;Cruz Soto et al, 1994;Fujimaki et al, 1994) indicate that peptides and amino acids are not limited for microbial growth in the rumen. However, the outcomes of the balance between RDP and RUP are dependent on interactions among rumen microbes.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Formalin Treated Soy Bean as a Source of Rumen Undegradable Protein on Rumen Functions of Non-lactating Dairy Cows on Concentrate Based-diets

Kanjanapruthipong¹,

Vajrabukka²,

Sindhuvanich³

2002

Asian Australas. J. Anim. Sci

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An objective of this study was to determine the effects of increasing contents of rumen undegradable protein (RUP) from formalin treated soy bean (FSBM) on rumen functions. Four rumen canulated non-lactating cows were randomly allocated to total mixed rations (TMR) containing different proportions of soy bean meal (SBM) and FSBM. Of rumen fermentation characteristics, concentrations of ruminal fluid ammonia and molar proportions of isoacids decreased with increasing contents of RUP in diets (p<0.01). The animals on TMR containing only SBM gained less weight and had smaller rumen volume than those on TMR containing RUP from FSBM (p<0.05). Organic matter and neutral detergent fiber digestibility in sacco were not different (p>0.05). The density of protozoa particularly small Entodinium sp. in ruminal fluid was higher in animal fed TMR containing SBM:FSBM (34:66) and FSBM than those fed TMR containing SBM:FSBM (66:34) and SBM (p<0.01). Total viable count, and net microbial protein synthesis as indicated by purine derivatives in urine increased with increasing contents of RUP from FSBM (p<0.01). It can be concluded that a reduction in net microbial protein synthesis in the rumen with increasing contents of RUP in the diet can be due to the reduction of preformed protein available for microbial growth as well as an increased turnover rate of microbial cells by predatory activity of protozoa.

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Section: Discussionmentioning

confidence: 45%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Formalin Treated Soy Bean as a Source of Rumen Undegradable Protein on Rumen Functions of Non-lactating Dairy Cows on Concentrate Based-diets

Kanjanapruthipong¹,

Vajrabukka²,

Sindhuvanich³

2002

Asian Australas. J. Anim. Sci

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Effects of Replacing Nonfiber Carbohydrates with Nonforage Detergent Fiber from Cassava Residues on Performance of Dairy Cows in the Tropics

Kanjanapruthipong¹,

Buatong²

2004

Asian Australas. J. Anim. Sci

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Four Holstein×Indigenous cows with ruminal canulas were used in a 4×4 Latin square design with 28 d periods to determine the effect of replacing nonforage fiber source (NFFS) from cassava residues for non-fiber carbohydrates (NFC) on ruminal fermentation characteristics and milk production. Dietary treatments contained 17% forage neutral detergent fiber (FNDF) from corn silage and 0, 3, 6 and 9% nonforage NDF from cassava residues and 11% nonforage NDF from other NFFS, so that levels of nonforage NDF were 11, 14, 17 and 20% dry matter (DM). Intakes of DM and net energy for lactation, average daily gain and milk fat percentage were not different (p>0.05). Ruminal pH, ammonia concentrations, acetate to propionate ratios, 24 h in sacco fiber digestibility significantly increased with increasing contents of nonforage NDF from cassava residues. Concentrations of VFA, urinary excretion of purine derivatives, milk protein percentage, production of milk and 4% FCM significantly decreased. These results suggest that NFC in diets is one of the limiting factors affecting productivity of dairy cows in the tropics and thus NFFS is better used as partial replacements for FNDF.

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Influence of amino acid supplements to a straw-maize-based urea diet on duodenal digesta flow and digestion in sheep

Cited by 2 publications

References 0 publications

Effects of Formalin Treated Soy Bean as a Source of Rumen Undegradable Protein on Rumen Functions of Non-lactating Dairy Cows on Concentrate Based-diets

Effects of Formalin Treated Soy Bean as a Source of Rumen Undegradable Protein on Rumen Functions of Non-lactating Dairy Cows on Concentrate Based-diets

Effects of Replacing Nonfiber Carbohydrates with Nonforage Detergent Fiber from Cassava Residues on Performance of Dairy Cows in the Tropics

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