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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0784    [Accepted] Published online February 25, 2020.
Effects of energy-protein supplementation frequency on performance of primiparous grazing beef cows during pre and postpartum
Felipe Henrique de Moura1  , Thaís Correia Costa1  , Aline Souza Trece1  , Luciano Prímola de Melo1  , Marcos Rocha Manso1  , Mário Fonseca Paulino1  , Luciana Navajas Rennó1  , Mozart Alves Fonseca2  , Edenio Detmann1  , Mateus Pies Gionbelli3  , Marcio de Souza Duarte1,* 
1Department of Animal Sciences, Universidade Federal de Viçosa, Viçosa, MG 36570-000, Brazil
2Department of Agriculture, Nutrition & Veterinary Sciences | CABNR, University of Nevada – Reno, Reno, NV 89557, United States
3Department of Animal Science, Universidade Federal de Lavras, Lavras, MG 37200-000, Brazil
Correspondence:  Marcio de Souza Duarte, Tel: +55-3136124636, Fax: +55-3136124636, Email: marcio.duarte@ufv.br
Received: 12 October 2019   • Revised: 10 November 2019   • Accepted: 20 February 2020
Twenty-four pregnant Nellore primiparous grazing cows were used to evaluate the effects of energy-protein supplementation and supplementation frequency during pre (105 d before calving) and postpartum (105 d after calving) on performance and metabolic characteristics.
Experimental treatments consisted of a control (no supplementation), daily supplementation (1.5 kg/d of concentrate/animal) and infrequent supplementation (4.5 kg of concentrate/animal every three days). During the pre and postpartum periods, concentrations of blood metabolites and animal performance were evaluated. Ureagenesis and energy metabolism markers were evaluated at prepartum period.
Supplementation frequency did not alter (P > 0.10) body weight (BW), average daily gain (ADG), and carcass traits during pre and postpartum. The BW (P = 0.079), adjusted BW at day of parturition (P = 0.078), and ADG (P = 0.074) were greater for supplemented cows during the prepartum. The body condition score (BCS; P = 0.251), and carcass traits (P > 0.10) were not affected by supplementation during prepartum. On postpartum, supplementation did not affect animal performance and carcass traits (P > 0.10). The dry mater (DM) intake was not affected (P > 0.10) by supplementation and supplementation frequency throughout the experimental period. Daily supplemented animals had greater (P < 0.001) glucose levels than animals supplemented every three days. Supplementation and supplementation frequency did not alter (P > 0.10) the levels of blood metabolites, neither the abundance of ureagenesis and energy metabolism markers.
In summary, our data show that the reduction of supplementation frequency does not cause negative impacts on performance and metabolic characteristics of primiparous grazing cows during the prepartum.
Keywords: Intake; Metabolism; Nitrogen Recycling; Periparturient Period; Tropical Pastures

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