Determination of maintenance energy requirement and responses of dry ewes to dietary inclusion of lucerne versus concentrate meal

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dc.contributor.authorWang, C.M.
dc.contributor.authorYan, Tianhai
dc.contributor.authorXie, K.L.
dc.contributor.authorChang, C.
dc.contributor.authorHou, F.J.
dc.date.accessioned2022-03-03T09:46:25Z
dc.date.available2022-03-03T09:46:25Z
dc.date.issued2021-05-23
dc.descriptionPublication history: Accepted - 2 February 2021; Published online - 23 May 2021en_US
dc.description.abstractAn accurate value for metabolizable energy (ME) requirement for maintenance (MEm) is essential to enable sheep husbandry practice to reach its potential. The objectives of the study were to use calorimetry chamber data of dry ewes (Hu × thin-tail Han F1 crossbred) to develop updated MEm, examine effects of substituting concentrate feed with lucerne hay on energy partitioning, and explore the relationships between energy utilization and fasting heat production (FHP). Data were collected from three experiments. In Exps. 1, 2a and 2b, lucerne hay was used to replace concentrates in three levels (0:40%, 15:25% and 30:10%), with diets containing 60% maize stover (Exp. 1), fresh rye forage (Exp. 2a) or dry rye forage (Exp. 2b). Within each experiment, diets were isoenergetic (digestible energy, DE) and isonitrogenous. Exp. 3 aimed at evaluating effects of three BW levels on nutrient utilization of dry ewes offered diets containing 60% maize stover, 15% lucerne hay and 25% concentrates. Energy metabolism data were measured using the respiration calorimeter chamber technique in all three experiments, followed by the measurement of FHP in Exps. 1, 2b and 3. The MEm derived from the linear regression between energy balance (EB) and ME intake was 0.440 MJ/kg BW0.75. The average FHP was 0.326 MJ/kg BW0.75. The fasting metabolism, net energy requirement for maintenance (NEm) and MEm were estimated to be 0.336, 0.359 and 0.511 MJ/kg BW0.75, respectively, through adjustment of FHP using fasting urinary energy output, activity allowance and efficiency of ME use for maintenance. The FHP was negatively correlated to EB/metabolic BW, ME/gross energy (GE), ME/DE, EB/GE intake and EB/ME intake, while positively correlated to HP/GE intake, HP/ME intake and CH4-E/GE intake. Compared to zero lucerne hay diet, the 15% lucerne hay intake decreased HP (MJ/d), and had no negative effects on EB (MJ/d) or energy utilization efficiencies. The results indicate that nutrient requirement standards currently used across the world are likely to underestimate MEm for dry ewes, and the selection of low FHP ewes for breeding has the potential to improve sheep production efficiency.en_US
dc.description.sponsorshipThis study was funded by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA2010010203), Gansu Provincial Science and Technology Support for Returning Grazing to Grass (18-0284), Gansu Provincial Key Project of Scientific and Technical Supporting Programs (18ZD2FA009), and the Program for Innovative Research Team of Chinese Ministry of Education (IRT_17R250).en_US
dc.identifierhttp://hdl.handle.net/20.500.12518/413
dc.identifier.citationWang, C.M., Yan, T., Xie, K.L., Chang, S.H., Zhang, C. and Hou, F.J. (2021) ‘Determination of maintenance energy requirement and responses of dry ewes to dietary inclusion of lucerne versus concentrate meal’, Animal. Elsevier BV. doi:10.1016/j.animal.2021.100200.en_US
dc.identifier.issn1751-7311
dc.identifier.issn1751-732X
dc.identifier.urihttps://doi.org/10.1016/j.animal.2021.100200
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.rights2021 The Authors. Published by Elsevier B.V. on behalf of The Animal Consortium. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)en_US
dc.subjectCalorimetry chamberen_US
dc.subjectEnergy balanceen_US
dc.subjectEnergy partitioningen_US
dc.subjectFasting heat productionen_US
dc.subjectMethane emissionsen_US
dc.titleDetermination of maintenance energy requirement and responses of dry ewes to dietary inclusion of lucerne versus concentrate mealen_US
dc.typeArticleen_US
dcterms.dateAccepted2021-02-02
dcterms.dateSubmitted2020-04-16

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