The dynamic behavior of feed efficiency in primiparous dairy cattle.

Seymour, D. J.; Cánovas, A.; Chud, T. C. S.; Cant, J. P.; Osborne, V. R.; Baes, C. F.; Schenkel, F. S.; Miglior, F. (2020). The dynamic behavior of feed efficiency in primiparous dairy cattle. Journal of dairy science, 103(2), pp. 1528-1540. American Dairy Science Association 10.3168/jds.2019-17414

[img] Text
1-s2.0-S0022030219310896-main.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (860kB) | Request a copy

A variety of measures are currently used to evaluate feed efficiency in livestock, with some of the most popular being the linear regression of nutrient intake on the various energy sinks of the cohort being evaluated. The adoption of novel on-farm technologies has greatly increased the breadth and depth of data being collected on a daily basis, which creates the opportunity for the implementation of more advanced feed efficiency models. The objectives of the current study were to leverage data collected using high-throughput biometric technologies to evaluate changes of early-lactation feed efficiency on a daily basis and to develop a novel measure of feed efficiency based on the NRC net energy model. Daily records of nutrient intake, fat- and protein-corrected milk yield, body weight, and body condition score were used to model 7 different indices of feed efficiency (gross feed efficiency, return over feed costs, residual feed intake, residual net energy intake, and net energy efficiencies of lactation, maintenance, and body reserve flux) in primiparous Holstein heifers (n = 40) from 0 to 150 d in milk. We observed that feed efficiency was dynamic and fluctuated over the course of the experimental period regardless of the efficiency measure used, but most measures followed similar trends in changes of efficiency on a day-to-day basis. Of the measures evaluated, return over feed costs would be most suited for management purposes due to practicality and simplicity, whereas other measures, such as the efficiency of net energy flux to and from body reserves, present potential targets for inclusion in breeding goals. Net energy efficiency of lactation was estimated to have higher repeatability compared with residual feed or energy intake, which may reduce the time required to estimate whole-lactation efficiency. Because decreased net energy balance was strongly correlated with increased efficiency for all indices evaluated, future work investigating the associations of feed efficiency with the magnitude and duration of negative energy balance is warranted.

Item Type:

Journal Article (Original Article)

Division/Institute:

05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH) > Institute of Genetics
05 Veterinary Medicine > Department of Clinical Research and Veterinary Public Health (DCR-VPH)

UniBE Contributor:

Baes, Christine Francoise

Subjects:

500 Science > 590 Animals (Zoology)
600 Technology > 630 Agriculture

ISSN:

0022-0302

Publisher:

American Dairy Science Association

Language:

English

Submitter:

Christine Francoise Baes

Date Deposited:

05 Aug 2020 08:36

Last Modified:

05 Aug 2020 08:36

Publisher DOI:

10.3168/jds.2019-17414

PubMed ID:

31837795

Uncontrolled Keywords:

feed efficiency net energy

BORIS DOI:

10.7892/boris.145579

URI:

https://boris.unibe.ch/id/eprint/145579

Actions (login required)

Edit item Edit item
Provide Feedback