Factors influencing estimates of heat energy associated with activity by grazing meat goats

Ten yearling Boer goat wethers (45.4±0.92kg) grazed a 0.8-ha grass pasture or were individually confined in a crossover experiment with 3-wk periods to evaluate factors influencing heat energy (HE) associated with activity (AEC) when grazing and to evaluate different methods of estimating the AEC. F...

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Bibliographic Details
Published in:Livestock science 2016-11, Vol.193, p.103-109
Main Authors: Brassard, M.-E., Puchala, R., Gipson, T.A., Sahlu, T., Goetsch, A.L.
Format: Article
Language:English
Subjects:
Activity
Boer (goat breed)
detergents
digestibility
Energy
energy requirements
forage
Goats
grasses
Grazing
heart rate
heat
least squares
pastures
walking
wethers
yearlings
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Summary:Ten yearling Boer goat wethers (45.4±0.92kg) grazed a 0.8-ha grass pasture or were individually confined in a crossover experiment with 3-wk periods to evaluate factors influencing heat energy (HE) associated with activity (AEC) when grazing and to evaluate different methods of estimating the AEC. Fresh forage offered to confined wethers was 15.9% and 13.4% CP and 65.0% and 67.4% NDF in periods 1 and 2, respectively. Based on forage and fecal acid detergent insoluble ash, digestibility of gross energy in forage by confined wethers averaged 67.9% and 56.5% in periods 1 and 2, respectively. From these values and fecal DM, least squares means of ME intake were 405 and 484kJ/kg BW0.75 for confined and grazing wethers, respectively (SE =15.4). HE determined from heart rate (HR) measured over 1d and the ratio of HE to HR estimated earlier was less (P
ISSN:1871-1413
1878-0490
DOI:10.1016/j.livsci.2016.10.005