Cherney D J, Patterson J A, Johnson K D
Dept. of Anim. Sci., Purdue University, West Lafayette, IN 47907.
J Anim Sci. 1990 Dec;68(12):4345-51. doi: 10.2527/1990.68124345x.
Our objectives were to determine the intake and digestibility of pearl millet as influenced by the brown-midrib (BMR), low-lignin trait and to determine the relative acceptability of BMR pearl millet in relation to its normal counterpart. Two field replicates of brown-midrib pearl millet and its normal counterpart were harvested as hay at the boot to heading stage twice during the growing season (2 genotypes x 2 cuttings x 2 field replicates). Twenty-four wethers had ad libitum access to a total forage diet (pearl millet forage), water and trace mineralized salt. The experimental period was 21 d (14 d for adjustment and 7 d for sample collection). Lignin was 23% lower (P less than or equal to .01) and in vitro DM digestibility (IVDMD) was 4% higher (P less than or equal to .01) in BMR vs normal genotype forages. Wethers preferred first-cutting millet to second-cutting millet, as evidenced by 62% higher (P less than or equal to .01) DMI for first-cutting forages. Dry matter intake of second-cutting forages was higher (P less than or equal to .10) for BMR pearl millet forage than for normal pearl millet (2.0 vs 1.5% of BW), but first-cutting forages were similar in DMI (2.9% of BW). In an acceptability trial of pearl millet regrowth (4 wk), grazing lambs with access to both genotypes displayed a marked preference (P less than .01) for the BMR genotype, spending an average of 2.6 min on plots containing the brown-midrib pearl millet for every minute spent on the normal genotype.(ABSTRACT TRUNCATED AT 250 WORDS)
我们的目标是确定褐色中脉（BMR）、低木质素性状对珍珠粟摄入量和消化率的影响，并确定BMR珍珠粟相对于其正常对照品种的相对可接受性。在生长季节，将褐色中脉珍珠粟及其正常对照品种的两个田间重复样本在孕穗至抽穗期分两次刈割制成干草（2个基因型×2次刈割×2个田间重复）。24只阉羊可随意采食全草料日粮（珍珠粟草料）、水和微量矿化盐。试验期为21天（14天适应期和7天样本采集期）。与正常基因型草料相比，BMR基因型草料的木质素含量低23%（P≤0.01），体外干物质消化率（IVDMD）高4%（P≤0.01）。阉羊更喜欢头茬粟而不是二茬粟，头茬草料的干物质摄入量比二茬高62%（P≤0.01）。BMR珍珠粟草料二茬的干物质摄入量高于正常珍珠粟（分别为体重的2.0%和1.5%，P≤0.10），但头茬草料的干物质摄入量相似（体重的2.9%）。在一项珍珠粟再生（4周）的可接受性试验中，能够接触到两种基因型的放牧羔羊对BMR基因型表现出明显的偏好（P<0.01），在含有褐色中脉珍珠粟的地块上平均停留2.6分钟，而在正常基因型地块上停留1分钟。（摘要截短至250字）
