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15 May 2020 Phenotypic and genetic correlations between feeding behaviours and feed efficiency in crossbred beef replacement females
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Abstract

The objectives of this study were to identify the phenotypic and genetic relationships and heritability (h2) of feeding behaviours (FB) in replacement beef females. Between 2005 and 2017, heifers (N = 1394) were tested for feed intake using an electronic feed bunk system. The various FB were feeding duration (DUR; min d−1), head down time (HD; min d−1), feeding frequency (FREQ; events d−1), time-to-bunk (TTB; min). Dry matter intake (DMI; kg d−1), and residual feed intake adjusted for off-test ultrasound back fat thickness (RFIFAT) were also reported. The h2 estimates for DUR, HD, FREQ, TTB, DMI, and RFIFAT were 0.25 ± 0.05, 0.26 ± 0.06, 0.27 ± 0.05, 0.29 ± 0.06, 0.26 ± 0.05, and 0.40 ± 0.07, respectively. These are the first h2 to be presented for these FB among developing replacement heifers on a high-forage diet.

Copyright remains with author C. Olson or their institution, and © Her Majesty the Queen in right of Canada 2020. Permission for reuse (free in most cases) can be obtained from copyright.com.
C.A. Olson, C. Li, H. Block, L. McKeown, and J.A. Basarab "Phenotypic and genetic correlations between feeding behaviours and feed efficiency in crossbred beef replacement females," Canadian Journal of Animal Science 100(4), 781-785, (15 May 2020). https://doi.org/10.1139/CJAS-2019-0212
Received: 6 December 2019; Accepted: 3 May 2020; Published: 15 May 2020
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