Cottonseed meal is a suitable replacement for soybean meal in supplements fed to Nellore heifers grazing Brachiaria decumbens
Leandro Soares Martins A C , Mário Fonseca Paulino A , Marcos Inácio Marcondes A , Luciana Navajas Rennó A , Daniel Mageste de Almeida A , Sidnei Antônio Lopes A , David Esteban Contreras Marquez A , Marcos Rocha Manso A , Aline Gomes da Silva A and Ériton Egídio Lisboa Valente B
+ Author Affiliations
- Author Affiliations
A Animal Science Department, Universidade Federal de Viçosa, Avenida Peter Henry Rolfs, Viçosa – MG, CEP: 36570-900, Brazil.
B Animal Science Department, Universidade Estadual do Oeste do Paraná, Toledo 85960-000, Brazil.
C Corresponding author. Email: leandro.martins@ufv.br
Animal Production Science 57(9) 1893-1898 https://doi.org/10.1071/AN15709
Submitted: 29 July 2015 Accepted: 10 May 2016 Published: 9 August 2016
Abstract
The objective was to evaluate the effect of substituting soybean meal with cottonseed meal in supplements containing 15% and 30% of crude protein (CP), as well as evaluate the effect of supplementation use, on the performance and nutritional status of Nellore heifers. Forty heifers that were 13 months old and 250 ± 4 kg were kept in five 2.5-ha paddocks covered with Brachiaria decumbens. They were compared as they received different supplements (1 kg/head.day) in a 2 × 2 + 1 factorial – two protein sources (soybean and cottonseed meal) by two protein concentrations (15% and 30%) plus a Control treatment, which was a mineral mix only. The supplemented heifers showed greater weight gains, final bodyweight (P < 0.10) and higher intake of all evaluated nutrients (P < 0.10), as well as greater digestibility of these nutrients compared with those from the Control treatment. The animals fed supplements containing 15% CP had lower digestibility of dry matter, organic matter, CP and neutral detergent insoluble fibre corrected for ash and protein. These animals also had lower total digestible nutrients as compared with those which received a supplement containing 30% CP (P < 0.10). The treatments containing cottonseed meal provided greater dry matter digestibility (P < 0.10). Cottonseed meal can fully substitute soybean meal to grazing heifers during the rainy season. Supplements containing 30% of CP provided greater digestibility than 15% CP supplements. Supplemented animals had better performance.
Additional keywords: beef cattle, pasture, protein.
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