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Anim Biosci > Accepted Articles
https://doi.org/10.5713/ab.21.0226    [Accepted] Published online October 29, 2021.
Provision of a protein-rich supplement for grazing suckling female beef calves to improve productive performance and metabolic response
Deilen S Moreno1,*  , Román Maza1  , David Contreras2  , Thiago Ramalho Moreira3  , Edson Junior Dos Santos3  , Daniel Mageste De Almeida3  , Mário Fonseca Paulino3  , Luciana Navajas Rennó3  , Edenio Detmann3 
1Faculty of Agricultural Sciences, University of Pamplona, Pamplona, 543050, Colombia
2Faculty of Agricultural Science, University of Cundinamarca, Fusagasugá, 252211, Colombia
3Animal Science Department, Federal University of Viçosa, Viçosa, 36570-900, Brazil
Correspondence:  Deilen S Moreno, Tel: +57-5685303 Ext 207, Fax: +57-5685303 Ext 207, Email: deilensotelo@gmail.com
Received: 13 May 2021   • Revised: 8 June 2021   • Accepted: 13 May 2021
This study was conducted to evaluate the effects of the provision of a protein-rich supplement on productive performance, and metabolic profile on grazing suckling female beef calves in tropical conditions during 150 d of experimentation.
Fifty-six Nellore suckling female calves, and their respective dams were distributed in a completely randomised design and made to undergo two treatments as follows: UNS (without supplementation), and SUP (supplementation with 5 g/kg body weight (BW) of a protein supplement). Throughout the experiment, animal performance and metabolic profile were evaluated. Also, ureagenesis and gluconeogenesis were assessed for gene expression.
SUP female calves showed a higher voluntary intake (p≤0.03) of the diet components evaluated, digestibility of organic matter (OM; p≤0.02) and microbial nitrogen production (MICN; p≤0.02) compared to UNS female calves. In its turn, serum urea nitrogen (SUN; p≤0.01) and insulin-like growth factor-1 (IGF-1; p≤0.03) levels and ureagenesis (p≤0.04) increased in SUP female calves compared to UNS female calves. Blood glucose and triglyceride levels were not affected by supplementation. The average daily gain (ADG) from SUP female calves was higher (p≤0.02) compared with UNS female calves. However, supplementation did not affect the body measures of the animals.


In summary, provision of a protein-rich supplement improves the intake and nutrients digestibility, ADG and final BW and increases metabolic indicators of the protein status in grazing suckling female beef calves in tropical conditions.
Keywords: Biopsy; Cattle; Gene Expression; Gluconeogenesis; Ruminant Feeding

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