Shah S K, Schermerhorn E C, Cady R A, McDowell R E
J Dairy Sci. 1983 Mar;66(3):573-7. doi: 10.3168/jds.S0022-0302(83)81827-X.
Monthly fat tests for 895 lactations of Nili-Ravi buffaloes in a Livestock Production Research Institute herd were used to estimate environmental effects on fat percentage. Fat tests rose progressively from 1st to 10th mo of lactation (5.51 to 7.46%). Average lactation fat percent was 6.55 +/- .06. Year effects were significant, but season, age, parity, milk yield, and health status were not. Percent fat increased slightly to maturity (6.54 first parity; 6.65 fifth). Lactations initiated April to September averaged slightly higher (6.60%) than other months (6.50%). There was a slight, although real, decrease in fat percent with increased lactation milk yield (6.60, 6.63, 6.60, 6.43, 6.51 for 1000 to 1500, 1501 to 2000, 2001 to 2500, 2501 to 3000, and greater than 3,000 kg). Effect of treatment for health problems was small (6.51 treated versus 6.59% untreated). Of all fat tests (7,772) 60% were 5.1 to 7.0%, 27% were between 7 and 9%, but only 3% exceeded 9%. Lactation fat percent averaged 1.0 less than most percents for buffaloes because of system of milking and milk yield (2,130 kg). Fat percentage of buffaloes appears to be influenced by environmental factors in the same proportion as for cattle, but buffaloes would be expected to exceed cattle in fat percent by 1 to 3% depending on breed and environmental conditions.
在一家畜牧生产研究所的牛群中，对895头泌乳期的尼里-拉菲水牛进行了每月一次的脂肪检测，以评估环境对脂肪百分比的影响。脂肪检测结果显示，泌乳期第1个月到第10个月脂肪含量逐渐上升（从5.51%升至7.46%）。平均泌乳期脂肪百分比为6.55±0.06。年份效应显著，但季节、年龄、胎次、产奶量和健康状况的影响不显著。脂肪百分比在接近成熟时略有增加（头胎为6.54%；第五胎为6.65%）。4月至9月开始的泌乳期平均脂肪含量略高于其他月份（6.60%）（其他月份为6.50%）。随着泌乳期产奶量的增加，脂肪百分比略有下降（产奶量在1000至1500千克、1501至2000千克、2001至2500千克、2501至3000千克以及超过3000千克时，脂肪百分比分别为6.60%、6.63%、6.60%、6.43%、6.51%）。健康问题治疗的影响较小（接受治疗的为6.51%，未接受治疗的为6.59%）。在所有脂肪检测结果（7772次）中，60%在5.1%至7.0%之间，27%在7%至9%之间，但只有3%超过9%。由于挤奶方式和产奶量（2130千克），水牛的泌乳期脂肪百分比平均比大多数水牛的百分比低1.0。水牛的脂肪百分比似乎受环境因素影响的比例与牛相同，但根据品种和环境条件不同，预计水牛的脂肪百分比会比牛高1%至3%。
