Estimation of endogenous contribution and urinary excretion of purine derivatives from the total digestible nutrient intake in Nellore heifers

Braga, Jercyane Maria da Silva; Valadares, Rilene Ferreira Diniz; Pellizzoni, Samantha Gusmão; Filho, Sebastião de Campos Valadares; Prates, Luciana L.; Silva, Luiz Fernando Costa e

doi:10.1590/s1516-35982012000800014

Cited by 7 publications

(4 citation statements)

References 28 publications

(33 reference statements)

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“…Under the conditions of the present study, the partial replacement of soybean meal by conventional and coated urea had no influence on the capacity for microbial protein production, which is because the sugarcane contains a good amount of highly fermentable carbohydrates, allowing bacteria to use the additional nitrogen to turn it into microbial protein.consequently, the results of the present study suggest that thesource of urea or coated urea at the supplemented level has no effect on the ruminal fermentation. The excretion of purine derivatives were lower than found by Vasconcelos et al (2010) Chizzotti et al (2007) and Braga et al (2012), that is, 87.80%; 86.60%; 86.10%; 90.46% and 89.69% respectively. These values suggest that the excretion of allantoin can be a good variable to represent the excretion of purine derivatives, in order to estimate the microbial protein production.…”

Section: Resultscontrasting

confidence: 52%

Nitrogen metabolism and microbial production of dairy cows fed sugarcane and nitrogen compounds

Gonçalves

Pedreira

Pereira

et al. 2014

Rev. bras. saúde prod. anim.

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The aim of this study was to evaluate the effect of dairy cow diets containing two different sources of urea on nitrogen metabolism and microbial synthesis. Eight crossbred cows were confined and distributed in two 4x4 Latin: FS - soybean meal (control), conventional urea (UC) 100%; ULL 44 UC = 56% / 44% ULL, ULL 88 UC = 12% / 88% ULL. Diets were offered to animals during 21 days with 14 days of adaptation. The N intake, retained nitrogen balance, nitrogen excretion in milk, urine, feces and total N excretion were similar and presented averages of 340.27g/day, 136.73g/day, 43.25g/day, 53.17g/day, 103.54g/day, and 199.96g/day, respectively. The percentages of urine and total nitrogen excretion were 16.24 and 60.71 (%), respectively. Ureic nitrogen in milk, urine and blood were 3.95mg/dL, 4.32mg/dl and 23.73mg/dL, respectively. The results found for the excretion of purine derivatives, allantoin, absorbable purines, microbial nitrogen, microbial protein and the relationship between microbial protein and digestible nutrients were 321.68mmol/day, 296.35mmol/day, 334.61mmol/day, 210.6g/day, 1316.27g/day, and 127.36g/kg, respectively. The partial replacement of soybean meal by conventional urea and / or urea encapsulated in feeding lactating cows yielded similar results in nitrogenous compounds, the concentrations of nitrogen from urine and milk and microbial protein synthesis.

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Section: Resultscontrasting

confidence: 52%

Nitrogen metabolism and microbial production of dairy cows fed sugarcane and nitrogen compounds

Gonçalves

Pedreira

Pereira

et al. 2014

Rev. bras. saúde prod. anim.

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“…In this experiment, the urinary allantoin and uric acid excretion, and total PD excreted and absorbed were not influenced by the diets (P > 0.05; Table 7). The concentration of allantoin in the urine of dairy cows is an important factor in estimating the amount of microbial protein being utilized (Braga et al, 2012). This similarity in the urinary excreted PD between the 2 groups of experimental cows may be attributed to the similar amounts of nutrient digestibility and DMI with feeding both diets.…”

Section: Excreted and Absorbed Purine Derivativesmentioning

confidence: 99%

Total replacement of corn silage with sorghum silage improves milk fatty acid profile and antioxidant capacity of Holstein dairy cows

Khosravi

Rouzbehan

Rezaei

et al. 2018

Journal of Dairy Science

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Total mixed rations containing corn silage (CS) or forage sorghum silage (SS) were fed to mid-lactation Holstein cows to determine the effects on feed intake, lactation performance, milk composition and fatty acid profile, nutrient digestibility, blood metabolites, rumen microbial N synthesis, and antioxidant status. The experiment was designed as a 2-period changeover (two 28-d periods) trial with 2 diets including CS diet or SS diet and 12 cows. Total replacement of CS with SS had no significant influence on dry matter intake. Substituting CS with SS had no effect on milk production, feed efficiency, and milk concentrations of fat, protein, lactose, and solids-not-fat, whereas yields of milk fat, protein, and lactose were greater for cows fed the CS diet. Blood parameters including glucose, albumin, cholesterol, triglyceride, total protein, urea N, and fatty acids were not affected by the dietary treatments. Apparent digestibility coefficients of dry matter, organic matter, crude protein, ether extract, neutral detergent fiber, and acid detergent fiber were not significantly influenced by the diets. Replacing CS with SS had no effect on total saturated fatty acids and total monounsaturated fatty acids, whereas total polyunsaturated fatty acid percentage was greater with the SS diet. Proportions of C20:0, C18: 3n-3, and C18: 3n-6 were affected by feeding SS. Cows fed CS had a greater amount of urinary purine derivatives. Feeding SS had a positive effect on total antioxidant capacity of blood and milk. In conclusion, SS can be fed to lactating Holstein cows as a total replacement for CS without undesirable effects on animal performance, but with positive effects on antioxidant capacity and polyunsaturated fatty acids of milk. This forage can be an excellent choice for dairy farms in areas where cultivation of corn is difficult due to water shortage.

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“…The similarity for allantoin and uric acid excretions is due to the diets being isoproteic. According to Braga et al (2012), the total excretion of purine derivatives in the urine results from protein catabolism in ruminants and are important variables for estimating the amount of synthesized microbial protein.…”

Section: Body Weight and Biometric Measurementsmentioning

confidence: 99%

Total Replacement of Millet Silage with BRS-716 Biomass Sorghum Silage in Crossbred Dairy Heifers Diets: Nutrient Intake and Digestibility, Microbial Protein Synthesis, Ingestive Behavior, and Growth Performance

Hora¹,

Júnior²,

Monção³

et al. 2021

Preprint

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This study addressed the different proportions of millet and sorghum silage biomass BRS 716 (BRS-716 silage) in the diet of crossbred heifers ½ to ¾ Holstein x Zebu on their nutrient intake, and digestibility, microbial protein synthesis, nitrogen balance, ingestive behavior, and growth performance. Five experimental diets with 0, 25/75, 50/50, 75/25, and 100% of BRS-716 silage in compared to millet silage were evaluated. The roughage: concentrate ratio in the total dry matter (DM) of the diets was 75:25. The diets were evaluated in ten heifers with an initial body weight of 264.95 ± 19.4 kg (± SEM), following the experimental design in two 5 x 5 Latin squares, simultaneously. The increase in the proportion of BRS-716 silage in the diet of crossbred dairy heifers did not change the dry matter intake (DMI), total digestible nutrients, indigestible neutral detergent fiber (iNDFI), and metabolizable energy. The means observed for DMI, and iNDFI were 7.85 kg/day, and 1.18 kg/day, respectively. For the excretion of purine derivatives, and microbial synthesis, there was no significant effect (P > 0.05), the mean microbial crude protein synthesis was 503.37 g/day. The different proportions of the BRS-716 silage, and millet silage did not change the final body weight (P = 0.89), weight gain (P = 0.08), feed efficiency (P = 0.50), and the body measurements of heifers (P > 0.05). The final body weight and average daily gain of heifers were 278.46 kg, and 0.795 kg/day, respectively. The millet silage, and BRS-716 silage in the diet of crossbred Holstein x Zebu heifers, used exclusively or combined in different proportions, allow dry matter intake, and nutrients, digestibility, nitrogen balance, microbial crude protein synthesis, ingestive behavior, and performance similar body.

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Estimation of endogenous contribution and urinary excretion of purine derivatives from the total digestible nutrient intake in Nellore heifers

Cited by 7 publications

References 28 publications

Nitrogen metabolism and microbial production of dairy cows fed sugarcane and nitrogen compounds

Nitrogen metabolism and microbial production of dairy cows fed sugarcane and nitrogen compounds

Total replacement of corn silage with sorghum silage improves milk fatty acid profile and antioxidant capacity of Holstein dairy cows

Total Replacement of Millet Silage with BRS-716 Biomass Sorghum Silage in Crossbred Dairy Heifers Diets: Nutrient Intake and Digestibility, Microbial Protein Synthesis, Ingestive Behavior, and Growth Performance

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