Marie-Etancelin Christel, Francois Dominique, Weisbecker Jean-Louis, Marcon Didier, Moreno-Romieux Carole, Bouvier Frédéric, Tortereau Flavie
GenPhySE, INRA, INPT, INP-ENVT, Université de Toulouse, Castanet Tolosan, France.
Unité Expérimentale La Sapinière, INRA, Osmoy, France.
J Anim Breed Genet. 2019 May;136(3):174-182. doi: 10.1111/jbg.12392. Epub 2019 Apr 4.
Breeding strategies based on feed efficiency are now implemented in most animal species using residual feed intake (RFI) criteria. Although relevant, the correlated responses of feeding behaviour traits resulting from such selection on RFI are poorly documented. We report the estimated feeding behaviour at three time levels (visit, meal and day) and genetic parameters between the feeding behaviour traits and their links with RFI and its components. Feed intake, feeding duration at three time levels (per visit, meal and day), feeding rate, number of visits and time-between-visits were estimated for 951 Romane lambs fed via automatic concentrate feeders. Heritability estimates of feeding behaviour traits ranged from 0.19 to 0.54 with higher estimates for the day level than the visit level. Daily feed intake was not genetically linked to feed intake at the visit level, whereas feeding duration between visit and day levels was moderately correlated (R = +0.41 ± 0.12). RFI was not significantly correlated with feeding rate, but was positively linked to feed intake and feeding duration at the day level (+0.73 ± 0.09 and +0.41 ± 0.13, respectively) and negatively at the visit level (-0.33 ± 0.14 and -0.22 ± 0.17, respectively). Selecting animals with lower RFI values might modify their feeding behaviour by increasing feed intake and feeding duration at the visit level but decrease the number of visits per day (+0.51 ± 0.14).
目前，大多数动物品种都在采用基于剩余采食量（RFI）标准的育种策略。尽管具有相关性，但这种基于RFI的选择所导致的采食行为性状的相关反应却鲜有文献记载。我们报告了在三个时间水平（访问、餐次和日）下估计的采食行为，以及采食行为性状之间的遗传参数，及其与RFI及其组成部分的联系。通过自动精料喂料器对951只罗曼羊的采食量、三个时间水平（每次访问、每餐和每日）的采食持续时间、采食率、访问次数和访问间隔时间进行了估计。采食行为性状的遗传力估计值在0.19至0.54之间，日水平的估计值高于访问水平。日采食量与访问水平的采食量没有遗传联系，而访问水平和日水平之间的采食持续时间呈中等程度相关（R = +0.41±0.12）。RFI与采食率没有显著相关性，但与日水平的采食量和采食持续时间呈正相关（分别为+0.73±0.09和+0.41±0.13），与访问水平呈负相关（分别为-0.33±0.14和-0.22±0.17）。选择RFI值较低的动物可能会改变它们的采食行为，即在访问水平上增加采食量和采食持续时间，但减少每日访问次数（+0.51±0.14）。
