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Permanent link (DOI): https://doi.org/10.7939/R3N90V

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Genetics of feed efficiency and feeding behavior in crossbred beef steers with emphasis on genotype-by-environment interactions Open Access

Descriptions

Other title
Subject/Keyword
Feed efficiency
Genotype-by-environment interaction
Beef steers
Feeding behavior
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Durunna, Obioha Nnamdi
Supervisor and department
Wang, Zhiquan (Agricultural, Food and Nutritional Science)
Moore, Stephen (Agricultural, Food and Nutritional Science)
Examining committee member and department
Basarab, John (Agricultural, Food and Nutritional Science)
Kenny, David (Ireland)
Okine, Erasmus (Agricultural, Food and Nutritional Science)
Li, Pengfei (Math & Statistical Sciences)
Department
Department of Agricultural, Food, and Nutritional Science
Specialization

Date accepted
2011-08-15T21:38:59Z
Graduation date
2011-11
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
This study examined whether crossbred steers had different production, feed efficiency and feeding behavior performances when they were fed a grower or finisher diet or both, in successive feeding periods. Major feed efficiency traits were residual feed intake (RFI) and gain to feed ratio (G:F) while feeding behavior traits were feeding duration (FD), head-down time (HDT) and feeding frequency (FF). Some steers received a grower diet in the first feeding period and a finisher diet in the second period (feed-swap); the control groups received only the grower or finisher diet in both periods. Compared to the control groups, about 7% more steers in the feed-swap group changed their RFI performance by 0.5 SD by the second period. Using steers in the feed-swap group (n = 331), the study observed greater (P < 0.05) FD, HDT and FF when the steers received the grower diet. Genetic correlations between the two feeding periods for this group were 0.78, 0.80, 0.78, 0.50, 0.91, 0.93 and 0.94 for DMI, ADG, G:F, RFI, FD, HDT, and FF, respectively. The genetic correlations may indicate the existence of genotype-by-environment interaction for DMI, ADG, RFI and G:F. The heritability estimates for the feed-swap group were greater in the grower-fed period for FD (0.25 vs 0.14) and HDT (0.14 vs 0.09) but were greater in the finisher-fed period for ADG (0.23 vs 0.08), DMI (0.34 vs 0.15), RFI (0.42 vs 0.08), G:F (0.40 vs 0.14) and feeding frequency (0.59 vs 0.56). The results indicate that the RFI, G:F, ADG and DMI measured on a grower or finisher diet may be considered as different traits for beef cattle genetic evaluations.
Language
English
DOI
doi:10.7939/R3N90V
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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