The effects of energy metabolism variables on feed efficiency in respiration chamber studies with lactating dairy cows

Journal of Dairy Science
Abdulai GuinguinaPekka Huhtanen

Abstract

The objective of the present study was to investigate factors related to variation in feed efficiency (FE) among cows. Data included 841 cow/period observations from 31 energy metabolism studies assembled across 3 research stations. The cows were categorized into low-, medium-, and high-FE groups according to residual feed intake (RFI), residual energy-corrected milk (RECM), and feed conversion efficiency (FCE). Mixed model regression was conducted to identify differences among the efficiency groups in animal and energy metabolism traits. Partial regression coefficients of both RFI and RECM agreed with published energy requirements more closely than cofficients derived from production experiments. Within RFI groups, efficient (Low-RFI) cows ate less, had a higher digestibility, produced less methane (CH4) and heat, and had a higher efficiency of metabolizable energy (ME) utilization for milk production. High-RECM (most efficient) cows produced 6.0 kg/d more of energy-corrected milk (ECM) than their Low-RECM (least efficient) contemporaries at the same feed intake. They had a higher digestibility, produced less CH4 and heat, and had a higher efficiency of ME utilization for milk production. The contributions of improved digestib...Continue Reading

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Jul 21, 2020·Journal of Dairy Science·A GuinguinaP Huhtanen

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Citations

Jul 21, 2020·Journal of Dairy Science·A GuinguinaP Huhtanen
Feb 16, 2021·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·Deyin ZhangWeimin Wang
Mar 6, 2021·Journal of Dairy Science·Pekka HuhtanenAbdulai Guinguina
Aug 5, 2021·Translational Animal Science·Phillip A LancasterLarry V Cundiff

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