Trait responses of Holstein Friesian cows with different genetic merits for milk yield in relation to low input feeding.

基本信息

• 作者：Laura Aufmhof; Deise Aline Knob; Kathrin Halli; Katharina May; Denise Gessner; Andreas Gattinger; Sven König
• DOI：10.3168/jds.2026-28547
• 原文链接：https://doi.org/10.3168/jds.2026-28547
• 数据来源：pubmed:pubmed-jds
• 抓取时间：2026-05-30T18:53:27+00:00
• Markdown 文件：/root/worksplace/paper-tracker/exports/obsidian/2026-05-18-trait-responses-of-holstein-friesian-cows-with-different-genetic-merits-for-milk-yield-in-relation-to-low-inp.md

摘要

The aim of the present study was to infer trait responses of Holstein-Friesian (HF) cows with differing genetic merits for milk yield and possible genotype x feeding interactions (GFI) considering organic high input (HI) versus organic low input (LI) feeding. In the LI feeding context, we hypothesized distinct adaptation abilities of HF cows with high genetic merit for milk yield, i.e., ongoing superiority over other genetic lines including a variety of primary and functional trait responses during a recording period of 12 mo for 125 milking cows. In such research context, we established a cross-classified genetic merit x feeding group (FG) experiment in a newly established cow barn at the University Gießen research station "Gladbacher Hof." The barn building consists of 2 completely identical compartments A and B mirrored across the feed alley regarding husbandry characteristics, technical equipment and management systems, but with differing feeding systems. Compartment A was used for organic HI feeding (energy content of 7.03 MJ NEL/kg DM), and compartment B for organic LI feeding (energy content of 6.25 MJ NEL/kg DM). For the allocation of the same number of cows into the 2 FG at the beginning of the experiment, we aimed on a cross-classified research experiment, i.e., identical genetic merits of lactating cows for milk yield in both groups considering the 50th percentile of estimated breeding values (EBV) for milk yield. Simultaneously, in the semi-randomized allocation procedure, we considered equal distributions in both groups regarding parity, lactation stage and the first 2 principal components from the pedigree relationship matrix. Generalized linear mixed models were applied to infer the main effects of the FG (2 classes HI and LI), genetic milk merit classes (3 classes with EBV_low, EBV_int, EBV_high) and the respective GFI on a broad pattern of primary and functional traits. The adaptation capability of high-yielding HF genetics to LI conditions during the challenging feeding transition period is manifested through stable and significantly higher least-squares-means (LSM) for milk yield when compared with the other genetic milk merit groups. Nevertheless, we identified significant (P <0.05) GFI for traits reflecting energy efficiency and metabolic physiology. This was especially observed for milk urea nitrogen, the ketosis indicator β -hydroxybutyrate concentration at lactation d 5, and fatty acid profiles, displaying re-rankings of EBV_high, EBV_int and EBV_low under HI and LI feeding. Hence, EBV_high cows displayed production superiority in milk yield, but partly by compromising metabolic stability, especially indicated through a substantial decline of LSM for BCS and BFT in the EBV_high group under LI feeding and the respective highly significant (P <0.001) GFI effect on BCS.

中文整理

基础摘要（未启用或未成功调用大模型）：The aim of the present study was to infer trait responses of Holstein-Friesian (HF) cows with differing genetic merits for milk yield and possible genotype x feeding interactions (GFI) considering organic high input (HI) versus organic low input (LI) feeding. In the LI feeding context, we hypothesized distinct adaptation abilities of HF cows with high genetic merit for milk yield, i.e., ongoing superiority over other genetic lines including a variety of primary and functional trait responses during a recording period of 12 mo for 125 milking cows. In such research context, we established a cross-classified genetic merit x feeding group (FG) experiment in a newly established cow barn at the U

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命中 奶牛/牛只 关键词：cow；命中 行为识别 关键词：feeding；命中 农业智能装备 关键词：equipment