Energy partition, nutritional energy requirements and methane production in F1 Holstein × Gyr bulls, using the respirometric technique
A. L. Ferreira A , A. L. C. C. Borges A B , R. C. Mourão A , R. R. Silva A , A. C. A. Duque A , J. S. Silva A , A. S. Souza A , L. C. Gonçalves A and P. H. A. Carvalho A
+ Author Affiliations
- Author Affiliations
A Department of Animal Science, Veterinary School, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
B Corresponding author. Email: analuizavetufmg@gmail.com
Animal Production Science 59(7) 1253-1260 https://doi.org/10.1071/AN17432
Submitted: 6 July 2017 Accepted: 20 August 2018 Published: 25 September 2018
Abstract
The nutritional energy requirements of animals for maintenance and weight gain, such as the energy partition of the diet, were determined in different feeding plans. Fifteen F1 Holstein × Gyr, non-castrated male bovines with a mean initial liveweight of 302 kg were used. The diets were corn silage and concentrate, formulated to enable gains of 100, 500 and 900 g/day, called low, medium and high weight gains, respectively. Tests of digestibility and metabolism were conducted to determine energy losses through faeces, urine and methane emissions. Heat production was determined using respirometry chamber. Net energy for maintenance was calculated as the antilogarithm of the intercept of the regression of the logarithm of the heat production, as a function of the metabolisable energy intake. Retained energy was obtained by subtracting the heat production from the metabolisable energy intake. With the increased consumption of dry matter, there was an increase in faecal and urinary energy loss. Retained energy increased linearly with the metabolisable energy intake. The net energy for gain in the diet did not differ among the treatments, such as the efficiency of use of metabolisable energy for weight gain kg (0.34). The net energy for maintenance was 312 kJ/kg LW0.75, and the metabolisable energy for maintenance was 523 kJ/kg LW0.75. The daily methane production (g/day) increased with the dry matter level and the daily loss represented 5.31% of the gross energy consumption.
Additional keywords: crossbreed, digestible energy, feeding efficiency, net energy, metabolisability.
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