Effects of rumen undegradable protein on intake, digestibility and rumen kinetics and fermentation characteristics of dairy heifers

Silva, Alex L.; Detmann, Edênio; Rennó, Luciana Navajás; Pedroso, Alexandre Mendonça; Santos, Marta Maria dos; Morais, V. C. L.; Sguizzato, Anna Luiza Lacerda; Abreu, Marcelo B.; Rotta, Polyana Pizzi; Marcondes, Marcos Inácio

doi:10.1016/j.anifeedsci.2018.07.019

Cited by 8 publications

(4 citation statements)

References 34 publications

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“…There was no interaction between RDUP levels and leucaena addition on organic matter digestibility value. Increasing RDUP levels tended to increase dry matter digestibility value as reported by a previous study that high RDUP levels increased digestibility by increasing nitrogen availability and improving microbial growth [15]. The high dry matter digestibility value in the dairy ration represents more nutrients supplied and utilized in the body.…”

Section: Nutrient Digestibilitysupporting

confidence: 62%

Inclusion of Different Level Leucaena in Dairy Ration to Balance Rumen Degradable and Undegradable Protein Ratio

Permana

Despal

Rosmalia

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Sustainability use of expensive protein source in a dairy ration requires ration formulation based on rumen degradable and undegradable protein ratio (RDUP). It improves the efficiency of microbial protein synthesis and less feed residue to the environment. Providing less expensive green protein sources such as leucaena (Leucaena leucocephala) is also an alternative. This study aimed to evaluate the effect of dairy ration based on RDUP with leucaena addition on in vitro fermentability and digestibility. This study was conducted in a 4 x 3 factorial randomized block design. Factor 1 was RDUP levels (R1= 60:40; R2= 55:45; R3= 50:50; R4= 45:55) and factor 2 was Leucaena addition (L1= 10%; L2= 20%; L3= 30%). The data were analyzed using ANOVA and followed by the Duncan test. The result showed that increasing RDUP levels increased NH3 concentration and dry matter digestibility. Treatment L2 resulted in a high NH3 concentration compared to other L treatments. The combination of R1 with L2 and L3 resulted in the highest total VFA concentration than other treatments. Protozoa population increased with increasing leucaena in the ration. It is concluded that dairy ration with 60:40 rumen degradable protein to undegradable protein ratio and 20% leucaena can improve ruminal fermentation and digestibility.

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Section: Nutrient Digestibilitysupporting

confidence: 62%

Inclusion of Different Level Leucaena in Dairy Ration to Balance Rumen Degradable and Undegradable Protein Ratio

Permana

Despal

Rosmalia

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Low RDUP levels tended to decrease digestibility. This is in line with Silva et al [14] which reported that high RUP decreased digestibility, especially in the small intestine. Treatment T3 had the highest DRD and ORD value compared to other treatments.…”

Section: In Vitro Digestibilitysupporting

confidence: 92%

Reformulation of Dairy Cattle Concentrate Based on Rumen Degradable Protein to Undegradable Protein Ratio at Different Energy Levels: In Vitro Study

Rosmalia

Dewi

Permana

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Asynchronous releasing rumen degradable protein (RDP) and energy reduces rumen microbial protein synthesis (MPS) and increases excess nutrients to the environment. Moreover, the ratio of RDP to rumen undegradable protein (RUP) was also important in improving the utilization of protein, especially for high-producing cows. However, the issue has not been a concern of most dairy concentrate manufacturers in tropical areas. The objective of this study was to determine the optimal ratio of RDP to RUP (RDUP) at different energy levels (TDN) of dairy cattle concentrate using in vitro method. The study used a 4 × 3 factorial randomized block design. The first factor was RDUP (1.50; 1.22; 1.00; 0.82) and the second factor was TDN levels (65%; 70%; 75%). Data were analyzed using ANOVA and followed by Duncan’s test. RDUP and TDN treatments affected NH3 concentration without interaction. Total VFA concentration, rumen bacteria, and protozoa population did not affect by the treatments. Dry matter and organic matter digestibility increased with increasing RDUP and TDN levels with an average of 71.58% and 70.67%, respectively. It is concluded that dairy concentrate based on RDP:RUP ratio at 1.50 (60:40) and 75% TDN improves fermentability and in vitro digestibility.

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“…Besides the amount of dietary N, the digestion and absorption site may also influence the N excretion, urea recycling and the efficiency of N utilisation. For instance, when the amount of dietary rumen undegradable protein is increased, N excretion can be decreased and the efficiency of N utilisation can be improved (13,14) . Therefore, if the N source is provided in the abomasum, the forage intake can increase (9,15) , the urinary N excretion decreases and efficiency of N utilisation is enhanced (15) .…”

mentioning

confidence: 99%

Urea supplementation in rumen and post-rumen for cattle fed a low-quality tropical forage

et al. 2020

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We evaluated the differences between the supplementation of urea in rumen and/or abomasum on forage digestion, nitrogen (N) metabolism, and urea kinetics in cattle fed a low-quality tropical forage. Five Nellore heifers were fitted with rumen and abomasum fistulas and assigned to a Latin square design. The treatments were: control, continuous infusion of urea in the abomasum (AC), continuous infusion of urea in the rumen, a pulse dose of urea in the rumen every 12 hours (PR), and a combination of PR and AC. The control exhibited the lowest (P<0.10) fecal and urinary N losses, which were, overall, increased by supplementation. The highest urinary N losses (P<0.10) was observed when urea was either totally or partially supplied as a ruminal pulse dose. The rumen N balance was negative for the control and when urea was totally supplied in the abomasum. The greatest microbial N production (P<0.10) was obtained when urea was partially or totally supplied in the abomasum. Urea supplementation increased (P<0.10) the amount of urea recycled to the gastrointestinal tract and the amount of urea-N returned to the ornithine cycle. The greatest (P<0.10) amounts of urea-N used for anabolism was observed when urea was totally and continuously infused in the abomasum. The continuous abomasal infusion also resulted in the highest (P<0.10) assimilation of microbial N from recycling. The continuous releasing of urea throughout day either in the rumen or abomasum is able to improve N accretion in the animal body, despite of mechanism responsible for that being different.

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Effects of rumen undegradable protein on intake, digestibility and rumen kinetics and fermentation characteristics of dairy heifers

Cited by 8 publications

References 34 publications

Inclusion of Different Level Leucaena in Dairy Ration to Balance Rumen Degradable and Undegradable Protein Ratio

Inclusion of Different Level Leucaena in Dairy Ration to Balance Rumen Degradable and Undegradable Protein Ratio

Reformulation of Dairy Cattle Concentrate Based on Rumen Degradable Protein to Undegradable Protein Ratio at Different Energy Levels: In Vitro Study

Urea supplementation in rumen and post-rumen for cattle fed a low-quality tropical forage

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