Production responses in young bulls fed glycerin as a replacement for concentrates in feedlot diets
A. C. B. de. Barros A , J. N. M. Neiva A C , J. Restle A , R. L. Missio B , F. R. C. Miotto A , D. A. G. Elejalde B and R. P. Maciel A
+ Author Affiliations
- Author Affiliations
A Escola de Medicina Veterinária e Zootecnia, Universidade Federal do Tocantins, BR 153, Km 112, Araguaína 77804-970, Tocantins, Brasil.
B Departamento de Agronomia, Universidade Tecnológica Federal do Paraná, Via do Conhecimento, Km 1, Pato Branco 85503-390, Paraná, Brasil.
C Corresponding author. Email: araguaia2007@gmail.com
Animal Production Science 58(5) 856-861 https://doi.org/10.1071/AN16288
Submitted: 4 May 2016 Accepted: 13 October 2016 Published: 4 April 2017
Abstract
We assessed the productive performance, blood parameters, and carcass characteristics of young crossbreed dairy bulls kept in feedlots and fed with diets containing 0, 60, 120, and 240 g/kg of crude glycerin, replacing a mixture of ground pearl millet grain (50%) and babassu mesocarp bran (50%). Twenty-four bulls with an average age of 24 months and an average initial weight of 390 ± 31.5 kg were used. The experimental design was completely randomised with six replications. Dry matter and digestible energy intake were not influenced by diets. Feed conversion linearly decreased with increasing glycerin levels. The increase in the levels of glycerin resulted in a linear increase in blood glucose and in average daily weight gain. Carcass weight was not affected, but trimming fat increased and carcass yield decreased linearly, with increasing glycerin levels. The addition of crude glycerin at levels up to 240 g/kg of dry matter to diets containing babassu mesocarp bran and ground pearl millet grain increased the performance of young feedlot bulls, and improved feed efficiency and carcass subcutaneous fat thickness.
Additional keywords: blood parameters, carcass weight, digestibility, weight gain.
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