Enteric methane emissions, energy partitioning, and energetic efficiency of zebu beef cattle fed total mixed ration silage
Objective The main objective of this study was to evaluate the effect of different feeding levels of a total mixed ration silage-based diet on feed intake, total tract digestion, enteric methane emissions, and energy partitioning in two beef cattle genotypes. Methods Six mature bulls (three Thai nat...
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doaj-379d0e1ea6a54c4684aced8a5d2e2e0e2020-11-25T01:58:50ZengAsian-Australasian Association of Animal Production SocietiesAsian-Australasian Journal of Animal Sciences1011-23671976-55172019-04-0132454855510.5713/ajas.18.043324096Enteric methane emissions, energy partitioning, and energetic efficiency of zebu beef cattle fed total mixed ration silageSayan Subepang0Tomoyuki Suzuki1Thamrongsak Phonbumrung2Kritapon Sommart3 Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand Japan International Research Center for Agricultural Science, Tsukuba, Ibaraki 305-8586, Japan Bureau of Animal Nutrition Development, Department of Livestock Development, Ratchathewi, Bangkok 10400, Thailand Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, ThailandObjective The main objective of this study was to evaluate the effect of different feeding levels of a total mixed ration silage-based diet on feed intake, total tract digestion, enteric methane emissions, and energy partitioning in two beef cattle genotypes. Methods Six mature bulls (three Thai natives, and three Thai natives - Charolais crossbreeds) were assigned in a replicated 3×3 Latin square design, with cattle breed genotype in separate squares, three periods of 21 days, and three energy feeding above maintenance levels (1.1, 1.5, and 2.0 MEm, where MEm is metabolizable energy requirement for maintenance). Bulls were placed in a metabolic cage equipped with a ventilated head box respiration system to evaluate digestibility, record respiration gases, and determine energy balance. Results Increasing the feeding level had no significant effect on digestibility but drastically reduced the enteric methane emission rate (p<0.05). Increasing the feeding level also significantly increased the energy retention and utilization efficiency (p<0.01). The Thai native cattle had greater enteric methane emission rate, digestibility, and energy utilization efficiency than the Charolais crossbred cattle (p<0.05). The daily metabolizable energy requirement for maintenance in Thai native cattle (388 kJ/kg BW0.75, where BW0.75 is metabolic body weight) was 15% less than that in Charolais crossbred cattle (444 kJ/kg BW0.75). Conclusion Our results suggested that the greater feeding level in zebu beef cattle fed above maintenance levels resulted in improved energy retention and utilization efficiency because of the reduction in enteric methane energy loss. The results also indicated higher efficiency of metabolisable energy utilization for growth and a lower energy requirement for maintenance in Bos indicus than in Bos taurus.http://www.ajas.info/upload/pdf/ajas-18-0433.pdfDigestibilityEnergy BalanceGreenhouse GasZebuRuminants |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sayan Subepang Tomoyuki Suzuki Thamrongsak Phonbumrung Kritapon Sommart |
spellingShingle |
Sayan Subepang Tomoyuki Suzuki Thamrongsak Phonbumrung Kritapon Sommart Enteric methane emissions, energy partitioning, and energetic efficiency of zebu beef cattle fed total mixed ration silage Asian-Australasian Journal of Animal Sciences Digestibility Energy Balance Greenhouse Gas Zebu Ruminants |
author_facet |
Sayan Subepang Tomoyuki Suzuki Thamrongsak Phonbumrung Kritapon Sommart |
author_sort |
Sayan Subepang |
title |
Enteric methane emissions, energy partitioning, and energetic efficiency of zebu beef cattle fed total mixed ration silage |
title_short |
Enteric methane emissions, energy partitioning, and energetic efficiency of zebu beef cattle fed total mixed ration silage |
title_full |
Enteric methane emissions, energy partitioning, and energetic efficiency of zebu beef cattle fed total mixed ration silage |
title_fullStr |
Enteric methane emissions, energy partitioning, and energetic efficiency of zebu beef cattle fed total mixed ration silage |
title_full_unstemmed |
Enteric methane emissions, energy partitioning, and energetic efficiency of zebu beef cattle fed total mixed ration silage |
title_sort |
enteric methane emissions, energy partitioning, and energetic efficiency of zebu beef cattle fed total mixed ration silage |
publisher |
Asian-Australasian Association of Animal Production Societies |
series |
Asian-Australasian Journal of Animal Sciences |
issn |
1011-2367 1976-5517 |
publishDate |
2019-04-01 |
description |
Objective The main objective of this study was to evaluate the effect of different feeding levels of a total mixed ration silage-based diet on feed intake, total tract digestion, enteric methane emissions, and energy partitioning in two beef cattle genotypes. Methods Six mature bulls (three Thai natives, and three Thai natives - Charolais crossbreeds) were assigned in a replicated 3×3 Latin square design, with cattle breed genotype in separate squares, three periods of 21 days, and three energy feeding above maintenance levels (1.1, 1.5, and 2.0 MEm, where MEm is metabolizable energy requirement for maintenance). Bulls were placed in a metabolic cage equipped with a ventilated head box respiration system to evaluate digestibility, record respiration gases, and determine energy balance. Results Increasing the feeding level had no significant effect on digestibility but drastically reduced the enteric methane emission rate (p<0.05). Increasing the feeding level also significantly increased the energy retention and utilization efficiency (p<0.01). The Thai native cattle had greater enteric methane emission rate, digestibility, and energy utilization efficiency than the Charolais crossbred cattle (p<0.05). The daily metabolizable energy requirement for maintenance in Thai native cattle (388 kJ/kg BW0.75, where BW0.75 is metabolic body weight) was 15% less than that in Charolais crossbred cattle (444 kJ/kg BW0.75). Conclusion Our results suggested that the greater feeding level in zebu beef cattle fed above maintenance levels resulted in improved energy retention and utilization efficiency because of the reduction in enteric methane energy loss. The results also indicated higher efficiency of metabolisable energy utilization for growth and a lower energy requirement for maintenance in Bos indicus than in Bos taurus. |
topic |
Digestibility Energy Balance Greenhouse Gas Zebu Ruminants |
url |
http://www.ajas.info/upload/pdf/ajas-18-0433.pdf |
work_keys_str_mv |
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