Thomas E D, Mandebvu P, Ballard C S, Sniffen C J, Carter M P, Beck J
W.H. Miner Agricultural Research Institute, Chazy, NY 12921, USA.
J Dairy Sci. 2001 Oct;84(10):2217-26. doi: 10.3168/jds.S0022-0302(01)74668-1.
A study was undertaken to compare Novartis N29-F1, a dual-purpose 90-d relative maturity corn hybrid, and Novartis NX3018, a 90-d relative maturity leafy corn silage hybrid for dry matter (DM) yield, in vitro digestibility, plant components, nutrient composition, and lactational performance by Holstein cows. The two corn hybrids were planted in replicated 15.2- x 321-m plots. Plant population and DM yield were similar between the two corn hybrids. Novartis NX3018 had higher content of crude protein and ash, a higher proportion of leaves and stalks, and a lower proportion of grain compared with Novartis N29-F1. The cob, grain, and leaves of Novartis NX3018 had higher in vitro true DM and neutral detergent fiber disappearances compared with the respective plant components of Novartis N29-F1. Thirty-eight midlactation multiparous Holstein cows (78 +/- 23.0 days in milk) producing 47.2 +/- 8.9 kg of milk per cow per day were blocked and assigned randomly to one of two total mixed ration (TMR) containing (DM basis) approximately 26% Novartis N29-F1 or Novartis NX3018 corn silage. Cows were housed in a free-stall barn and group fed ad libitum. The lactation study was conducted as a crossover design with two 28-d periods. Samples and data were collected during the final 7 d of each period. The total mixed rations were formulated using the Cornell-Penn-Miner Dairy nutrition model. Cows that were fed the total mixed rations containing Novartis NX3018 corn silage produced higher yields of milk 3.5% fat-corrected milk (FCM), milk crude protein, and milk lactose compared to cows that were fed the TMR containing Novartis N29-F1 corn silage. In conclusion, the Novartis NX3018 corn hybrid was leafier and more digestible in vitro, and when fed to dairy cows as silage, promoted higher milk yield compared with the Novartis N29-F1 corn hybrid.
开展了一项研究，以比较诺华N29 - F1（一种两用型相对成熟度为90天的玉米杂交种）和诺华NX3018（一种相对成熟度为90天的多叶玉米青贮杂交种）在干物质（DM）产量、体外消化率、植株组成、营养成分以及荷斯坦奶牛泌乳性能方面的差异。这两种玉米杂交种种植在重复的15.2×321米地块中。两种玉米杂交种的种植密度和干物质产量相似。与诺华N29 - F1相比，诺华NX3018的粗蛋白和灰分含量更高，叶片和茎秆比例更高，籽粒比例更低。与诺华N29 - F1的相应植株部分相比，诺华NX3018的果穗、籽粒和叶片的体外真干物质和中性洗涤纤维消失率更高。38头处于泌乳中期的经产荷斯坦奶牛（产奶78±23.0天），每头奶牛每天产奶47.2±8.9千克，被分成若干组并随机分配到两种全混合日粮（TMR）之一，这两种日粮（以干物质计）分别含有约26%的诺华N29 - F1或诺华NX3018玉米青贮料。奶牛饲养在自由牛舍中，采用群体自由采食的方式。泌乳研究采用交叉设计，分为两个28天的阶段。在每个阶段的最后7天收集样本和数据。全混合日粮采用康奈尔 - 宾夕法尼亚 - 米纳奶牛营养模型配制。与饲喂含诺华N29 - F1玉米青贮料的全混合日粮的奶牛相比，饲喂含诺华NX3018玉米青贮料的全混合日粮的奶牛产奶量更高，包括3.5%乳脂校正乳（FCM）、牛奶粗蛋白和牛奶乳糖。总之，与诺华N29 - F1玉米杂交种相比，诺华NX3018玉米杂交种叶片更多，体外消化率更高，作为青贮料饲喂奶牛时，能提高产奶量。
