Metabolizable amino acids and energy requirements of Nellore and crossbred Angus × Nellore bulls fed rations of different crude protein concentrations

Amaral, P. M.; Mariz, Lays Débora Silva; Zanetti, Diego; Santos, Stefanie Alvarenga; Pacheco, M.V.C.; Pereira, Jessica; Silva, F.A.S.; Filho, S. C. Valadares

doi:10.1016/j.animal.2020.100036

Cited by 3 publications

(12 citation statements)

References 28 publications

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“…The metabolizable TNEAA requirements for a gain of cattle (250 kg empty body weight gain) by Amaral et al [23] were used for this purpose: aspartic (Asp) acid (25.83/100 gm protein), Ser (12.89/100 gm protein), Glu (19.15/100 gm protein), Pro (16.44/100 gm protein), Gly (16.85/100 gm protein), Ala (19.75/100 gm protein), thyronine (10.76/100 gm protein), Arg (12.80/100 gm protein), and cysteine (Cys) (5.54/100 gm protein).…”

Section: Methodsmentioning

confidence: 99%

Nonessential amino acids in tropical ruminant feed: Investigating grass and legume forages of Indonesia

Tresia,

Anggraeny,

Winarsih

et al. 2024

J Adv Vet Anim Res

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Objective: This study aimed to examine the concentration of nonessential amino acids (NEAAs) in ruminant feed in tropical areas, with a focus on forage grasses and legumes in Indonesia. Materials and Methods: A total of 11 grasses (Chrysopogon zizanioides, Brachiaria brizantha, Brachiaria humidicola, Paspalum dilatatum, Paspalum atatum, Chloris gayana, Pennisetum polystachion, Panicum maximum, Cenchrus biflorus, Andropogon canaliculatus, and Digotaria decumbens) and six legumes (Arachis hypogaea, Pueararia Javanica, Centrosema pubescens, Clitoria ternatea, and Arachis pintoi) were analyzed for NEAA content using high-performance liquid chromatography (HPLC). Results: Based on the results of this research, it was found that almost all NEAA content in forage was less than 3% (Serine (Ser), Alanine (Ala), Glycine (Gly), Tyrosine (Tyr), Proline (Pro), Cysteine (Cys), and Asparagine (Asn), except for glutamic (Glu) acid and arginine (Arg) in some legumes. The Glu content in grass ranges from 0.76% to 2.61%, and the Arg content ranges from 0.92% to 2.09%. These two NEAAs were most abundant in grasses and legumes, with concentrations of 5.10% to 6.27% and 3.10% to 5.53%, respectively. Conclusion: Our study concluded that Glu and Arg were the most abundant NEAAs in tropical forages in Indonesia, with legumes having a higher concentration of NEAAs compared to grasses. Among the legumes, A. hypogaea had the highest NEAA content (23.40%), while among the forages, C. zizanioides had the highest NEAA content (12.37%). However, it was observed that neither legumes nor grasses could fulfill the metabolizable TNEAAs requirements for gaining cattle (250 kg of empty body weight gain), unlike commercial concentrates, which were found to meet the requirements, especially for Arg, Glu, and thyronine. The provision of concentrate is necessary to supplement forage to meet the NEAA needs for cattle.

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Section: Methodsmentioning

confidence: 99%

Nonessential amino acids in tropical ruminant feed: Investigating grass and legume forages of Indonesia

Tresia,

Anggraeny,

Winarsih

et al. 2024

J Adv Vet Anim Res

View full text Add to dashboard Cite

show abstract

“…Thus, before generating new equations, the prediction of CP intake by the BR-CORTE (2010) was tested in the last edition (BR-CORTE, 2016). For that, 271 individual data of cattle from 8 studies were collected: Costa e Silva (2011), Souza (2013), Rufino (2014), Silva (2014), Menezes (2016), Prados (2016), Amaral (2016) and Zanetti (2017). The database included dissertations and theses that were concluded after 2010 and were not part of the database of the second edition of BR-CORTE (BR-CORTE, 2010).…”

Section: Evaluation Of Crude Protein Requirements Utilizing the Br-co...mentioning

confidence: 99%

“…Despite the considerable progress in modeling microbial protein synthesis (NASEM, 2016) and AA digestibility (Tamminga and Oldham, 1980;Mariz et al, 2018), there have been limited advances in intermediate metabolism of AA and especially in net AA requirements of ruminants (Tedeschi et al, 2015;Schwab and Broderick, 2017;Amaral et al, 2021). Thus, robust predictive models need to be developed to estimate net and metabolizable AA requirements of cattle, which allow balancing diets for both rumen microorganisms and the host animal.…”

Section: Amino Acids Requirementsmentioning

confidence: 99%

“…In this regard, Amaral et al (2021) and Mariz et al (2018) developed complementary studies, which 1) evaluated the AA content in empty body and estimated net requirements of AA and energy for weight gain of purebred (Nellore) and crossbred Angus × Nellore (A × N) bulls; 2) determined the apparent and true intestinal digestibility total and individual AA and estimated the efficiency of wholebody AA retention from individual and total absorbed AA.…”

Section: Amino Acids Requirementsmentioning

confidence: 99%

“…There is a deficiency of AA requirements data in the literature, especially for beef cattle. Moreover, data utilized for Amaral et al (2021) and Mariz et al (2018) were obtained in Brazilian production conditions. Therefore, the above-mentioned studies will serve as the basis of the net and metabolizable AA requirements incorporated into the current edition of this publication.…”

Section: Amino Acids Requirementsmentioning

confidence: 99%

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