The effects of dietary crude protein level on ammonia emissions from slurry from lactating Holstein-Friesian cows as measured in open-circuit respiration chambers.

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dc.contributor.authorKatongole, Constantine
dc.contributor.authorYan, Tianhai
dc.date.accessioned2022-06-14T14:12:59Z
dc.date.available2022-06-14T14:12:59Z
dc.date.issued2022-05-12
dc.descriptionPublication history: Accepted - 10 May 2022; Published online - 12 May 2022en_US
dc.description.abstractThe effect of dietary crude protein (CP) level on ammonia (NH3) emissions from slurry from lactating Holstein-Friesian cows was studied. Twenty-four-hour total collections of faeces and urine were made from 24 lactating Holstein-Friesian cows fed four total mixed rations containing 141, 151, 177, and 201 g CP/kg DM (6 cows/diet). The collected urine and faeces from each cow were combined to form 2 kg duplicate slurry samples (weight/weight; fresh basis) according to the proportions in which they were excreted. NH3 emissions from the slurry samples were measured, during 0–24 and 24–48 h intervals in six open-circuit respiration chambers maintained at two temperatures (8 or 18 °C). NH3 emissions for the 0–24 and 0–48 h intervals, as well as the average daily emissions, increased linearly with increasing dietary CP level. Increasing the temperature from 8 to 18 °C positively affected NH3 emissions, but only for the 0–24 h interval. In situations where direct measurements are impossible, NH3 emissions from slurry can be predicted accurately using equations based on dietary CP level supported by either urinary nitrogen, faeces nitrogen, or both. In summary, increasing dietary CP level linearly increased average daily NH3 emissions from slurry, with a 5.4 g increase for each 10 g increase in dietary CP.en_US
dc.description.sponsorshipThis research project was funded by the Department of Agriculture Environment and Rural Affairs (DAERA) in Northern Ireland.en_US
dc.identifierhttp://hdl.handle.net/20.500.12518/455
dc.identifier.citationKatongole, C.B. and Yan, T. (2022) ‘The Effects of Dietary Crude Protein Level on Ammonia Emissions from Slurry from Lactating Holstein-Friesian Cows as Measured in Open-Circuit Respiration Chambers’, Animals. MDPI AG. doi:10.3390/ani12101243.en_US
dc.identifier.issn2076-2615
dc.identifier.urihttps://doi.org/10.3390/ani12101243
dc.language.isoenen_US
dc.publisherMDPIen_US
dc.rights© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).en_US
dc.subjectammonia emissionen_US
dc.subjectdietary crude proteinen_US
dc.subjectrespiration chamberen_US
dc.subjectslurryen_US
dc.titleThe effects of dietary crude protein level on ammonia emissions from slurry from lactating Holstein-Friesian cows as measured in open-circuit respiration chambers.en_US
dc.typeArticleen_US
dcterms.dateAccepted2022-05-10
dcterms.dateSubmitted2022-03-27

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