Zhou Xiaokang, Fu Shuaiqi, Li Gaiying, Yao Zhaohui, Du Xingjie, Zhang Yan, Gao Tengyun
College of Animal Science and Technology, Henan International Joint Laboratory of Nutrition Regulation and Ecological Raising of Domestic Animal, Henan Agricultural University, Zhengzhou, Henan, China.
Front Vet Sci. 2024 Dec 20;11:1479535. doi: 10.3389/fvets.2024.1479535. eCollection 2024.
Twenty-four cows were used in a randomized complete block design. Cows were assigned to three groups: (1) Control, (2) 3-nitrooxypropanol (NOP) of 200 mg/kg feed dry matter (10% NOP), and (3) NOP × MAL (10% NOP at 200 mg/kg feed dry matter plus 99% -malate at 10 g/kg feed dry matter). Cows were fed for 10-wk. NOP did not affect dry matter intake (DMI) or milk yield, whereas NOP × MAL decreased DMI but did not affect milk yield. Average methane production decreased by 54% in NOP and by 51% in NOP × MAL. Both NOP and NOP × MAL increased concentrations of milk fat and protein. In addition, concentrations of short-chain fatty acids and total saturated fatty acids increased in both NOP and NOP × MAL. However, total monounsaturated fatty acids and total polyunsaturated fatty acids only increased in NOP × MAL.
采用随机完全区组设计，使用了24头奶牛。奶牛被分为三组：（1）对照组，（2）每千克饲料干物质添加200毫克3-硝基氧丙醇（NOP，10% NOP），以及（3）NOP×苹果酸（每千克饲料干物质添加200毫克10% NOP加每千克饲料干物质添加10克99%苹果酸）。奶牛饲喂10周。NOP不影响干物质采食量（DMI）或产奶量，而NOP×苹果酸降低了DMI，但不影响产奶量。NOP组平均甲烷产量下降了54%，NOP×苹果酸组下降了51%。NOP和NOP×苹果酸均提高了乳脂和蛋白质浓度。此外，NOP和NOP×苹果酸组的短链脂肪酸和总饱和脂肪酸浓度均有所增加。然而，总单不饱和脂肪酸和总多不饱和脂肪酸仅在NOP×苹果酸组中增加。
