Milk Composition and Production Efficiency within Feed-To-Yield Systems on Commercial Dairy Farms in Northern Ireland

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dc.contributor.authorCraig, Aimee-Louise
dc.contributor.authorGordon, Alan
dc.contributor.authorHamill, Gregory
dc.contributor.authorFerris, Conrad
dc.date.accessioned2022-08-02T14:28:52Z
dc.date.available2022-08-02T14:28:52Z
dc.date.issued2022-07-11
dc.descriptionPublication history: Accepted - 5 July 2022; Published - 11 July 2022.en_US
dc.description.abstractThis study examined the relationships between milk yield and diet composition, nutrient intakes, milk composition, and feed use efficiency when concentrates were offered using a feedto- yield (FTY) approach. The study was conducted on 26 dairy farms in Northern Ireland. Cows (n = 3471) were fully housed and were offered concentrates on an FTY basis. Individual cow genetic information was obtained for 18 herds. Concentrate intakes of individual cows were either obtained from the farms or calculated, while milk yield and milk composition data were obtained from test-day milk recording. Mean test-day milk yields during months 2 to 5 post-calving were calculated for each cow, and cows within each lactation were placed into one of six equal-sized milk yield (kg/cow/day) groups. Diet effects and performance responses to milk yield groups were tested for linear and quadratic effects. Total dry matter intakes increased with increasing milk yield. Milk fat and milk protein concentration declined as milk yield increased, which could be attributed in part to genetics and diet. As milk yield increased, nitrogen and energy use efficiency was improved. However, concentrates offered per kg of energy-corrected milk also increased at higher milk yields, indicating an increased reliance on concentrates for these cows.en_US
dc.description.sponsorshipThis research was funded by the Department of Agriculture, Environment and Rural Affairs (DAERA) and AgriSearch through the Research Challenge Fund.en_US
dc.identifierhttp://hdl.handle.net/20.500.12518/472
dc.identifier.citationCraig, A.-L., Gordon, A.W., Hamill, G. and Ferris, C.P. (2022) ‘Milk Composition and Production Efficiency within Feed-To-Yield Systems on Commercial Dairy Farms in Northern Ireland’, Animals. MDPI AG. doi:10.3390/ani12141771.en_US
dc.identifier.issn2076-2615 (electronic)
dc.identifier.urihttps://doi.org/10.3390/ani12141771
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.subjectdairy cattleen_US
dc.subjectfeed-to-yielden_US
dc.subjectmilk compositionen_US
dc.subjectconcentrate use efficiencyen_US
dc.subjectnitrogen efficiencyen_US
dc.titleMilk Composition and Production Efficiency within Feed-To-Yield Systems on Commercial Dairy Farms in Northern Irelanden_US
dc.typeArticleen_US
dcterms.dateAccepted2022-07-05
dcterms.dateSubmitted2022-05-25

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