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Article . 2021
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Livestock Science
Article . 2021 . Peer-reviewed
License: Elsevier TDM
Data sources: Crossref
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Intake and digestibility of meat ewes belonging to two contrasting feed efficiency genetic lines, during their two first production cycles

Authors: Azizi, A.; Nascimento, H.; Tortereau, F.; Hazard, D.; Douls, S.; Durand, C.; Bonnal, Laurent; +4 Authors

Intake and digestibility of meat ewes belonging to two contrasting feed efficiency genetic lines, during their two first production cycles

Abstract

International audience; Feed is the largest cost in animal production, therefore improving feed efficiency (FE) is one of the main priorities when redesigning farming systems. The objective of this work was to evaluate the effects of a divergent genetic selection for FE in Romane rams [i.e. efficient (RFI-) or inefficient (RFI+)] on the feed intake and nutrient digestibility of their daughters (ewes), reared in different conditions. Different to their sires, which were fed high concentrate-diets, the ewes were fed ad libitum total mixed ration (TMR) composed of silage (65%), hay (25%) and barley (10%). A series of in vivo digestibility trials were conducted using Romane ewes (n =20; 10 RFI- and 10 RFI+) during their 2 first production cycles. The BW, metabolic BW (MBW), body condition score (BCS), DM intake (DMI) and nutrient intake and digestibility were individually monitored. All parameters were significantly affected (P < 0.05) by the production cycle. The BW, MBW, BCS as well as the feed intake and nutrient digestibility were higher in the cycle 2 compared to cycle 1. The exception was the CP digestibility, which was higher in younger ewes (cycle 1). The BW and MBW was, as expected, higher in older ewes thus increasing the feed intake capacity in cycle 2 compared with cycle 1. Slight differences in TMR nutritive composition between the years of the study were also probably responsible of differences in CP digestibility. The RFI+ ewes showed a better BCS than RFI- ewes (3.0 vs. 2.7; P < 0.0001). In the conditions used in this study, we could not demonstrate any differences in intake and digestive efficiency between the two ewe FE lines, probably because the selected rams were tested with one diet (concentrate-based diet) whereas their daughters (ewes) with another (forage-based diet). Further research is warranted to evaluate RFI testing in animals fed a more fibrous diet closer to that of ewes under range conditions whereas also assessing responses to multiple-generation divergent selection on RFI.

Country
France
Subjects by Vocabulary

Microsoft Academic Graph classification: Silage Total mixed ration Nutrient intake Biology Feed conversion ratio Animal science Body condition score Nutrient digestibility Hay Genetic selection

Keywords

Ovin, Efficacité conversion alimentaire, Digestibilité, http://aims.fao.org/aos/agrovoc/c_4670, feed efficiency, http://aims.fao.org/aos/agrovoc/c_3081, Animal à viande, http://aims.fao.org/aos/agrovoc/c_34366, Prise alimentaire (animaux), L02 - Alimentation animale, General Veterinary, http://aims.fao.org/aos/agrovoc/c_2746, Selection divergente, L10 - Génétique et amélioration des animaux, Brebis, http://aims.fao.org/aos/agrovoc/c_4188, http://aims.fao.org/aos/agrovoc/c_16126, http://aims.fao.org/aos/agrovoc/c_16125, digestibility, ruminants, [SDV.SA.SPA]Life Sciences [q-bio]/Agricultural sciences/Animal production studies, Intake, http://aims.fao.org/aos/agrovoc/c_7030, divergent selection, Animal Science and Zoology, http://aims.fao.org/aos/agrovoc/c_2266

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    1
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Average
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Average
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
Average
Funded by
EC| iSAGE
Project
iSAGE
Innovation for Sustainable Sheep and Goat Production in Europe
  • Funder: European Commission (EC)
  • Project Code: 679302
  • Funding stream: H2020 | RIA
Related to Research communities
Sustainable Development Solutions Network - Greece
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