Effects of several protein supplements on flow of soluble non-ammonia nitrogen from the forestomach and milk production in dairy cows

Choi, Chang Weon; Vanhatalo, Aila; Ahvenjärvi, Seppo; Huhtanen, Pekka

doi:10.1016/s0377-8401(02)00251-1

Cited by 34 publications

(69 citation statements)

References 26 publications

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“…Present peptide diurnal patterns in omasal digesta were relatively consistent with previous studies (Chen et al, 1987c;Robinson et al, 1998) where peptide flow in rumen digesta was highest immediately post-feeding and declined thereafter. Since peptide flow as well as SNAN flow in omasal digesta were significantly higher than that in rumen digesta (Choi et al, 2002b), actual rumen-escapable peptide flow in the previous studies should be higher than the ruminal peptide flow despite similar diurnal patterns in peptide flow between rumen and omasal digesta. Dietary supplementation did not show clear differences in peptide flow between treatments, but omasal peptide flow obtained from dairy cows fed supplemented diets was obviously higher (p<0.05) compared with GS diet during the entire feeding cycle.…”

Section: Diurnal Pattern In Omasal Snan Flow Fractionsmentioning

confidence: 73%

“…For instance, flow of peptide and soluble protein in rumen digesta was not clearly associated with an increase in CP of diets (Chen et al, 1987a), whereas casein supplementation increased peptide concentration in rumen digesta (Broderick and Wallace, 1988). However, the SNAN data in rumen digesta described above may not be same to actual amounts of rumen-escapable N because SNAN flow in rumen digesta was considerably lower than that in omasal digesta (Choi et al, 2002b). Also, determining SNAN flow from omasal digesta can minimize the contribution of endogenous N to SNAN flow (Ørskov et al, 1986).…”

Section: Introductionmentioning

confidence: 93%

“…However, this assumption has been shown to be seriously flawed (Dhanoa et al, 1999;Udén, 2000;Volden et al, 2002). For example, when skimmed milk powder was used as a protein supplement for dairy cows, the soluble nonammonia N (SNAN) concentration in omasal digesta was 110 mg N/l (Choi et al, 2002b). Assuming a rumen volume of 80.1 and a liquid passage rate of 0.15/h, approximately 32 g N/d of SNAN could potentially escape the rumen.…”

Section: Introductionmentioning

confidence: 99%

“…Assuming a rumen volume of 80.1 and a liquid passage rate of 0.15/h, approximately 32 g N/d of SNAN could potentially escape the rumen. It was calculated that 116 g/kg of skimmed milk powder N escaped ruminal degradation as SNAN in dairy cows (Choi et al, 2002b).…”

Section: Introductionmentioning

confidence: 99%

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Diurnal Patterns in the Flow of Escapable Soluble Non-Ammonia Nitrogen Fractions in Omasal Digesta as Influenced by Barley and Rapeseed Meal Supplementation in Cows Fed Grass Silage Based Diet

2007

Journal of Animal Science and Technology

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The present study was conducted to measure diurnal patterns in the flow of soluble non-ammonia nitrogen (SNAN) fractions in the liquid phase of digesta entering the omasum of cows fed grass-red clover silage supplemented with barley and rapeseed meal. Four ruminally cannulated cows were fed, in a 4 × 4 Latin square design, grass-red clover silage alone (GS) or supplemented with (on a DM basis) 6.0 kg/d of barley grain, 2.1 kg/d of rapeseed meal or 6.0 kg/d of barley and 2.1 kg/d rapeseed meal. Omasal digesta was taken using an omasal sampling system at 1.5 h intervals during a 12 h feeding cycle, and SNAN fractions (free AA, peptide and soluble protein) in the omasal digesta were assessed using ninhydrin assay. Dietary supplementation numerically increased the mean flow of SNAN fractions relative to GS diet despite the lack of statistical significance. Diurnal patterns in the flow of peptide entering the omasum during a 12 h feeding cycle appeared to be highest immediately after feeding, declined by 10.0 h post-feeding and slightly increased thereafter. In SNAN fractions, the flow of peptide was higher for supplemented diets than for GS diet throughout the feeding cycle. Based on the microbial contribution to total SNAN using 15 N, diurnal patterns in the flow of dietary SNAN for dietary supplemented diets appeared to be higher compared with GS diets. Present results may conclude that peptide flow is quantitatively the most important N in SNAN fractions and that dietary supplementation can increase peptide flow entering the omasal canal.

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Section: Diurnal Pattern In Omasal Snan Flow Fractionsmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Diurnal Patterns in the Flow of Escapable Soluble Non-Ammonia Nitrogen Fractions in Omasal Digesta as Influenced by Barley and Rapeseed Meal Supplementation in Cows Fed Grass Silage Based Diet

2007

Journal of Animal Science and Technology

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“…The rumen degradable protein can be converted to ammonia, absorbed through the rumen wall, detoxified to urea in the liver (Lobley et al, 1995) and largely lost in the urine (Choi et al, 2002). Whilst excess supply of N to the rumen is the main source for urea N excretion, it is not the only one.…”

Section: Discussionmentioning

confidence: 99%

Different true-protein sources do not modify the metabolism of crossbred Bos taurus × Bos indicus growing heifers

et al. 2015

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-The present study was conducted to investigate the effect of alternative true-protein sources to soybean meal, with different ruminal degradability, using a sugarcane-based diet, on nutrient digestion, ruminal fermentation, efficiency of microbial protein synthesis and passage rate in prepubertal dairy heifers. Eight crossbred rumen-and duodenum-cannulated Holstein × Gyr dairy heifers (202.0±11.5 kg BW) were evaluated in a 4 × 4 Latin square experimental design with four treatments and four periods in two simultaneous replicates. Dietary treatments were: soybean meal; cottonseed meal; peanut meal; and sunflower meal. When associated with diets containing sugarcane, the different protein sources did not affect intake or digestibility of dry mater, crude protein, organic matter and neutral detergent fiber. The average ruminal pH, NH 3 -N and concentration of total volatile fatty acids were not different among the diets supplied. The concentration of butyric acid was different among the protein sources, wherein the animals fed the diet with sunflower meal presented lower values than those fed the other sources. Diets did not affect nitrogen balance, microbial nitrogen, microbial synthesis efficiency, estimated dry matter flow, or passage rate. Alternative protein sources can be used to reduce the costs without changing the animal metabolism.

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Mechanism of peptide absorption in the isolated forestomach epithelial cells of dairy cows

Liu

Zhao

et al. 2018

J Sci Food Agric

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Effects of several protein supplements on flow of soluble non-ammonia nitrogen from the forestomach and milk production in dairy cows

Cited by 34 publications

References 26 publications

Diurnal Patterns in the Flow of Escapable Soluble Non-Ammonia Nitrogen Fractions in Omasal Digesta as Influenced by Barley and Rapeseed Meal Supplementation in Cows Fed Grass Silage Based Diet

Diurnal Patterns in the Flow of Escapable Soluble Non-Ammonia Nitrogen Fractions in Omasal Digesta as Influenced by Barley and Rapeseed Meal Supplementation in Cows Fed Grass Silage Based Diet

Different true-protein sources do not modify the metabolism of crossbred Bos taurus × Bos indicus growing heifers

Mechanism of peptide absorption in the isolated forestomach epithelial cells of dairy cows

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