Sartori Cristina, Tiezzi Francesco, Guzzo Nadia, Mancin Enrico, Tuliozi Beniamino, Mantovani Roberto
Department of Agronomy, Food, Natural Resources, Animals and Environment-DAFNAE, University of Padova, Viale dell'Università, 16, 35020 Legnaro, Italy.
Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, Piazzale delle Cascine 18, 50144 Firenze, Italy.
Animals (Basel). 2022 Mar 26;12(7):839. doi: 10.3390/ani12070839.
Local breeds are often reared in various environmental conditions (EC), suggesting that genotype by environment interaction (GxE) could influence genetic progress. This study aimed at investigating GxE and response to selection (R) in Rendena cattle under diverse EC. Traits included milk, fat, and protein yields, fat and protein percentage, and somatic cell score, three-factor scores and 24 linear type traits. The traits belonged to 11,085 cows (615 sires). Variance components were estimated in a two-step reaction norm model (RNM). A single trait animal model was run to obtain the solutions of herd-EC effect, then included in a random regression sire model. A multivariate response to selection (R) in different EC was computed for traits under selection including beef traits from a performance test. GxE accounted on average for 10% of phenotypic variance, and an average rank correlation of over 0.97 was found between bull estimated breeding values (EBVs) by either including or not including GxE, with changing top ranks. For various traits, significantly greater genetic components and R were observed in plain farms, loose housing rearing system, feeding total mixed ration, and without summer pasture. Conversely, for beef traits, a greater R was found for mountain farms, loose housing, hay-based feeding and summer pasture.
本地品种通常在各种环境条件下饲养，这表明基因型与环境互作（GxE）可能会影响遗传进展。本研究旨在调查不同环境条件下伦德讷牛的GxE和选择反应（R）。性状包括产奶量、乳脂产量、乳蛋白产量、乳脂率、乳蛋白率和体细胞评分、三因素评分以及24个线性体型性状。这些性状来自11,085头母牛（615头公牛）。方差成分在两步反应规范模型（RNM）中进行估计。首先运行单性状动物模型以获得畜群 - 环境效应的解，然后将其纳入随机回归公牛模型。针对包括性能测试中的牛肉性状在内的选择性状，计算了不同环境条件下的多元选择反应（R）。GxE平均占表型方差的10%，并且在包含或不包含GxE的情况下，公牛估计育种值（EBV）之间发现平均秩相关超过０.９７，排名变化。对于各种性状，在平原农场、散栏饲养系统、饲喂全混合日粮且没有夏季牧场的情况下，观察到显著更大的遗传成分和选择反应。相反，对于牛肉性状，山地农场、散栏饲养、以干草为基础的饲养方式和夏季牧场的选择反应更大。
