Casper David P, Pretz Jon P, Ramsier Cliff
Casper's Calf Ranch, 4890 West Lily Creek Road, Freeport, IL 61032, USA.
Department of Animal Sciences, North Carolina A&T State University, Greensboro, NC 27411, USA.
Animals (Basel). 2025 Jun 21;15(13):1836. doi: 10.3390/ani15131836.
Early-lactation high-producing dairy cows require highly digestible forages. Thirty early-lactation (58 days in milk; 38.9 kg/d milk) cows were blocked and randomly assigned to one of two treatments. The treatments were the control (), consisting of corn silage and alfalfa haylage produced via university crop production practices, versus supplementing soil and crop additives () during crop production. Milk production (32.6 and 36.9 kg/d for CON and SCA, respectively) increased ( < 0.04) when cows were fed SCA forages compared with cows fed CON forages, while the dry matter intakes were similar ( < 0.46). The yields of milk fat were similar ( > 0.26), but the milk protein (0.98 and 1.09 kg/d), lactose (1.62 and 1.88 kg/d), and total solids (3.77 and 4.25 kg/d) contents were greater ( < 0.05) for cows fed SCA compared with cows fed CON. The total-tract apparent neutral detergent fiber (48.5 and 54.7%) and acid detergent fiber (48.3 and 54.4%) digestibility increased ( < 0.03), while the starch digestibility (97.9 and 98.4%) tended ( < 0.06) to increase for cows fed SCA compared with cows fed CON. Feeding highly digestible forages during early lactation improved milk production, milk composition, and fiber digestibility in a high-forage ration.
泌乳早期的高产奶牛需要高消化率的饲草。30头泌乳早期（产奶58天；日产奶量38.9千克）的奶牛被分组并随机分配到两种处理方式之一。处理方式分别为对照组（CON），由大学作物生产实践产出的玉米青贮和苜蓿青贮组成，以及在作物生产过程中添加土壤和作物添加剂（SCA）的处理组。与饲喂CON饲草的奶牛相比，饲喂SCA饲草的奶牛产奶量增加（P<0.04）（CON组和SCA组分别为32.6千克/天和36.9千克/天），而干物质采食量相似（P<0.46）。乳脂产量相似（P>0.26），但与饲喂CON的奶牛相比，饲喂SCA的奶牛乳蛋白含量（0.98千克/天和1.09千克/天）、乳糖含量（1.62千克/天和1.88千克/天）和总固体含量（3.77千克/天和4.25千克/天）更高（P<0.05）。与饲喂CON的奶牛相比，饲喂SCA的奶牛全肠道中性洗涤纤维表观消化率（48.5%和54.7%）和酸性洗涤纤维消化率（48.3%和54.4%）提高（P<0.03），淀粉消化率（97.9%和98.4%）有提高的趋势（P<0.06）。在泌乳早期饲喂高消化率饲草可提高高饲草日粮下的产奶量、乳成分和纤维消化率。
